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{{TC stats cyclone3|cat=cat2|name=Fabio|dates=July 12 – July 18|max-winds=105 (165)|min-press=972|areas=[[Baja California Peninsula]], [[Western United States]] |damage=Minor|deaths=None}}
{{TC stats cyclone3|cat=cat2|name=Fabio|dates=July 12 – July 18|max-winds=105 (165)|min-press=972|areas=[[Baja California Peninsula]], [[Western United States]] |damage=Minor|deaths=None}}
{{TC stats cyclone3|cat=cat1|name=Gilma|dates=August 7 – August 11|max-winds=80 (130)|min-press=984|areas=None|damage=None|deaths=None}}
{{TC stats cyclone3|cat=cat1|name=Gilma|dates=August 7 – August 11|max-winds=80 (130)|min-press=984|areas=None|damage=None|deaths=None}}
{{TC stats cyclone3|cat=storm|name=Hector|dates=August 11 – August 17|max-winds=45 (75)|min-press=993|areas=Baja California Peninsula|damage=Minimal|deaths=None}}
{{TC stats cyclone3|cat=storm|name=Hector|dates=August 11 – August 17|max-winds=45 (75)|min-press=993|areas=[[Baja California Peninsula]]|damage=Minimal|deaths=None}}
{{TC stats cyclone3|cat=cat1|name=Ileana|dates=August 27 – September 2|max-winds=85 (140)|min-press=976|areas=None|damage=None|deaths=None}}
{{TC stats cyclone3|cat=cat1|name=Ileana|dates=August 27 – September 2|max-winds=85 (140)|min-press=976|areas=None|damage=None|deaths=None}}
{{TC stats cyclone3|cat=storm|name=John|dates=September 2 – September 4|max-winds=40 (65)|min-press=1001|areas=Baja California Peninsula, Southern Mexico, Western Mexico|damage=Minimal|deaths=None}}
{{TC stats cyclone3|cat=storm|name=John|dates=September 2 – September 4|max-winds=40 (65)|min-press=1001|areas=[[Baja California Peninsula]], [[Southern Mexico]], [[Western Mexico]]|damage=Minimal|deaths=None}}
{{TC stats cyclone3|cat=storm|name=Kristy|dates=September 12 – September 17|max-winds=60 (95)|min-press=998|areas=Baja California Peninsula|damage=Minimal|deaths=None}}
{{TC stats cyclone3|cat=storm|name=Kristy|dates=September 12 – September 17|max-winds=60 (95)|min-press=998|areas=[[Baja California Peninsula]]|damage=Minimal|deaths=None}}
{{TC stats cyclone3|cat=cat1|name=Lane|dates=September 15 – September 19|max-winds=80 (130)|min-press=989|areas=None|damage=None|deaths=None}}
{{TC stats cyclone3|cat=cat1|name=Lane|dates=September 15 – September 19|max-winds=80 (130)|min-press=989|areas=None|damage=None|deaths=None}}
{{TC stats cyclone3|cat=cat3|name=Miriam|dates=September 22 – September 28|max-winds=120 (195)|min-press=958|areas=None|damage=None|deaths=None}}
{{TC stats cyclone3|cat=cat3|name=Miriam|dates=September 22 – September 28|max-winds=120 (195)|min-press=958|areas=None|damage=None|deaths=None}}
{{TC stats cyclone3|cat=storm|name=[[Tropical Storm Norman (2012)|Norman]]|dates=September 28 – September 29|max-winds=45 (75)|min-press=1000|areas=Baja California Peninsula, Western Mexico ('''[[Sinaloa]]''')|damage=Unknown|deaths=None}}
{{TC stats cyclone3|cat=storm|name=[[Tropical Storm Norman (2012)|Norman]]|dates=September 28 – September 29|max-winds=45 (75)|min-press=1000|areas=[[Baja California Peninsula]], [[Western Mexico]] ('''[[Sinaloa]]''')|damage=Unknown|deaths=None}}
{{TC stats table end3|num-cyclones=14|dates=May&nbsp;14&nbsp;– Currently Active&nbsp;|max-winds=140 mph (220 km/h)|min-press=945|tot-areas=|tot-damage=<107.7|tot-deaths=7}}
{{TC stats table end3|num-cyclones=14|dates=May&nbsp;14&nbsp;– Currently Active&nbsp;|max-winds=140 mph (220 km/h)|min-press=945|tot-areas=|tot-damage=<107.7|tot-deaths=7}}
</center>
</center>

==Accumulated Cyclone Energy (ACE)==
{{Hurricane season ACE ranking|ref=Talk:2012 Pacific hurricane season/ACE calcs
| 17.9875 | | Emilia
| 14.7050 | 0.1225 | Daniel
| 10.1400 | | Fabio
| 9.6750 | | Miriam
| 7.1500 | | [[Hurricane Bud (2012)|Bud]]
| 6.4925 | | Ileana
| 4.9325 | | Gilma
| 4.3925 | | Lane
| 3.5100 | | [[Hurricane Carlotta (2012)|Carlotta]]
| 2.7975 | | Kristy
| 2.0150 | | Hector
| 1.1775 | | Aletta
| 0.3675 | | John
| 0.2825 | | Norman
}}

The table on the right shows the [[Accumulated Cyclone Energy|ACE]] for each storm in the season. Broadly speaking, the ACE is a measure of the power of a hurricane multiplied by the length of time it existed, so storms that last a long time, as well as particularly strong hurricanes, have high ACEs. ACE is calculated for only full advisories on specifically tropical systems reaching or exceeding wind speeds of 34&nbsp;knots (39&nbsp;mph, 63&nbsp;km/h), or tropical storm strength. Accordingly, tropical depressions are not included here. The ACE also does not include subtropical storms. Later the NHC reexamines the data, and produces a final report on each storm, which can lead to the ACE for a storm being revised either upward or downward. Until the final reports are issued, ACEs are, therefore, provisional.

The figures in parentheses are for storms in the Central Pacific basin west of [[140th meridian west|140°W]]; those not in parentheses are for the Eastern Pacific basin.
{{clear}}


==See also==
==See also==

Revision as of 02:48, 30 September 2012

2012 Pacific hurricane season
Season summary map
Seasonal boundaries
First system formedMay 14, 2012
Last system dissipatedSeason still active
Strongest storm
NameEmilia
 • Maximum winds140 mph (220 km/h)
 • Lowest pressure945 mbar (hPa; 27.91 inHg)
Seasonal statistics
Total depressions14
Total storms14
Hurricanes9
Major hurricanes
(Cat. 3+)		4
Total fatalities7 total
Total damage< $107.7 million (2012 USD)
Related article
Pacific hurricane seasons
2010, 2011, 2012, Post-2012

The 2012 Pacific hurricane season is a moderately active Pacific hurricane season. The season officially began on May 15, 2012, in the East Pacific, and June 1, 2012, in the Central Pacific, and ends on November 30, 2012. These dates conventionally delimit the period of each year when most tropical cyclones develop in the Pacific basin. However, with the formation of Tropical Storm Aletta on May 14, 2012 slightly exceeded these bounds.

Hurricane Bud intensified into the first major hurricane of the season, one of three to do so in the month of May. In mid-June, Hurricane Carlotta came ashore near Puerto Escondido, Mexico. Seven people were killed by Carlotta and damage amounted to MX$1.4 billion (US$107.7 million). Tropical Storms Hector, John, Kristy, and Norman all threatened land; however, damage from these storms were relativity minor.

Seasonal forecasts

Predictions of tropical activity in the 2012 season
Source Date Named
storms 		Hurricanes Major
hurricanes
Average (1971–2006) 15.3 8.8 4.2
Record high activity 28 16 (tie) 10
Record low activity 8 (tie) 3 0 (tie)
–––––––––––––––––––––––––––––––––––––––––––––––––––––––
NOAA May 24, 2012 12-18 5-9 2-5
–––––––––––––––––––––––––––––––––––––––––––––––––––––––
Actual activity 14 9 4

On May 24, the Climate Prediction Center released its pre-season outlook. The scientists stated a 30% chance of a below-normal season, a 50% chance of a near-normal season and a 20% chance of an above-normal season. The climatologists expected 12–18 named storms, with 5–9 becoming hurricanes, and 2–5 becoming major hurricanes. The below-normal activity forecast was because of increased wind shear and a high expectation of El Niño-Southern Oscillation (ENSO)-neutral conditions throughout the peak in the later months of summer, together with lingering La Niña conditions at the beginning of the season, even though there had already been two named systems – one tropical storm and one major hurricane – in the month of May.[1]

Seasonal summary

Main article: Timeline of the 2012 Pacific hurricane season
Tropical Storm Norman (2012)Hurricane Carlotta (2012)Hurricane Bud (2012)Saffir–Simpson Hurricane Scale

Thus far, the season has been relatively active. Hurricane Bud became a major hurricane in May, marking the third occurrence of such.[2] Hurricane Carlotta threatened Mexico in mid-June. In July three hurricanes developed, two of which reached major hurricane strength. With the formation of Hurricane Fabio on July 12, the season was a month ahead of normal.[3]

Storms

Tropical Storm Aletta

Tropical storm (SSHWS)
 
DurationMay 14 – May 19
Peak intensity50 mph (85 km/h) (1-min);
1000 mbar (hPa)

During the early morning hours of May 12, the National Hurricane Center began to monitor an area of disturbed weather that had developed roughly 550 mi (890 km) to the south-southwest of Acapulco.[4] Moving towards the west-northwest, the system was assessed with a high chance of becoming a tropical cyclone over the next 48 hours during the afternoon hours of the following day as shower and thunderstorm activity had become better defined.[5] The disturbance continued to organize, and by early on May 14, it was deemed sufficiently well organized to be declared as Tropical Depression One-E, a day before the official start of the 2012 Pacific hurricane season.[6] Embedded within a favorable environment for further intensification, the tropical depression intensified into Tropical Storm Aletta at 0000 UTC May 15.[7] Twelve hours later the tropical storm attained its peak intensity with winds of 50 mph and a minimum barometric pressure of 1000 millibars before weakening ensued as Aletta entered an environment characterized by moderate vertical wind shear and an increasingly stable air mass. Late on May 16, Aletta was downgraded to a tropical depression,[8] and the system was declared post-tropical two days later after it was unable to sustain deep thunderstorm activity atop the low-level center for at least twelve hours.[9] The remnants of the storm completely dissipated on May 21.[10]

Hurricane Bud

Category 3 hurricane (SSHWS)
 
DurationMay 21 – May 26
Peak intensity115 mph (185 km/h) (1-min);
960 mbar (hPa)
Main article: Hurricane Bud (2012)

On May 12, a low pressure system formed just south of eastern Panama. The storm slowly organized as it moved westwards. On May 15, the storm acquired a burst of convection, and the NHC began to monitor the system.[11] As the storm turned west-northwestwards, it organized significantly. On May 17, wind shear began to erode the storm's convection, weakening the system and causing it to stall, although the system continued to persist. On May 20, the storm strengthened rapidly, as it began moving again and that night the NHC reported that the storm had strengthened into Tropical Depression Two-E.[12] Then, as it slightly accelerated to the west, the storm continued to organize, eventually intensifying into Tropical Storm Bud on May 22, with 40 mph (65 km/h) sustained winds.[13] Bud remained at this intensity for one day before strengthening, starting early on May 23, and reached winds of 65 mph (100 km/h) during the afternoon.[14] By the next morning, Bud continued its rapid intensification, reaching sustained winds of 85 mph (145 km/h),[15] and then 110 mph (175 km/h) by the afternoon, as the system turned northward.[16] Later on the same day, Bud turned to the northeast, and began to approach the coast of Western Mexico.[17] Late on May 24, Bud intensified further into a Category 3 major hurricane, and obtained a peak intensity of 115 mph (185 km/h) winds, with a minimum central low pressure of 960 millibars.[18] Hurricane Bud was able to maintain Category 3 intensity for the next several hours, even as its outer rainbands began moving onshore in Western Mexico. Early on May 25, Hurricane Bud weakened down to a strong Category 2 hurricane.[19] Hurricane Bud rapidly began to weaken, as it slowly moved onshore. Bud quickly lost most of its convection, which was sheared mainly to the north. During the mid-afternoon of May 25, Bud weakened down to a strong tropical storm, as it began making landfall on Western Mexico.[20] Further weakening ensued over the next 24 hours, and Bud degenerated into a remnant low early on May 26.[21]

Hurricane Carlotta

Category 2 hurricane (SSHWS)
 
DurationJune 14 – June 17
Peak intensity105 mph (165 km/h) (1-min);
976 mbar (hPa)
Main article: Hurricane Carlotta (2012)

A tropical wave in the Eastern Pacific quickly became organized on June 13,[22] and became Tropical Depression Three-E early the next day.[23] The National Hurricane Center upgraded it to a Tropical Storm and named it "Carlotta" that afternoon.[24] Carlotta passed over very favorable environmental conditions that allowed further intensification into a Category 2 hurricane.[25] On June 16, Carlotta weakened back into a Category 1 and then made landfall near Puerto Escondido, Mexico, with maximum winds of 90 mph.[26] After making its landfall, Carlotta quickly weakened to a tropical depression because of the mountainous terrain along the coastline.[27] Carlotta continued to move westward, and soon dissipated to a remnant low, late on June 16. Its remnants later merged with another trough of low pressure.[28]

Upon formation, hurricane watches were issued for the southern coastline of Mexico.[23] This was later upgraded to a warning when Carlotta became a hurricane.[29] The storm made landfall in southern Mexico, bringing with it heavy rains and gusty winds which caused flash floods and numerous landslides along the area, primarily the state of Oaxaca. Due to the severity of the situation in Oaxaca the governor requested for a state of emergency to be declared to his state.[30] Throughout Mexico, seven people were killed by Carlotta and damage amounted to MX$1.4 billion (US$107.7 million).[31][32]

Hurricane Daniel

Category 3 hurricane (SSHWS)
 
DurationJuly 4 – July 11
Peak intensity115 mph (185 km/h) (1-min);
961 mbar (hPa)

Early on July 2, the National Hurricane Center began monitoring an area of disturbed weather about 475 mi (764 km) south-southeast of Acapulco. Over the next 24 hours, the disturbance continued to become increasingly better organized, and a Tropical Cyclone Formation Alert was issued on the system early on July 3.[33] By early on July 4, the system had gained enough organization to be declared as Tropical Depression Four-E.[34] On July 5, Four-E became Tropical Storm Daniel.[35] The cyclone then slowly intensified, and after having been situated over a favorable environment for two days, it intensified into a hurricane.[36] Overnight July 7 to July 8, Daniel rapidly intensified further into a Category 2 hurricane with sustained winds of 105 mph (165 km/h).[37] Just hours later, Daniel reached its peak intensity of 115 mph (185 km/h) and a central pressure of 961 millibars, a Category 3 hurricane, although the eye was already over cooler waters.[38] However, Daniel only maintained Category 3 status briefly, and six hours later, the eye became less well-defined and the storm weakened back to a Category 2 hurricane.[39] The system maintained this intensity for a while, but by July 9, the hurricane weakened further to a Category 1.[40] Early on July 10, Daniel continued to weaken, eventually becoming a small, shallow tropical storm over a low ocean heat content.[41] The storm then crossed 140°W into the central Pacific as a heavily sheared tropical storm with little convection.[42] On July 11, Daniel's low level circulation center started to became exposed under moderate vertical wind shear. It further weakened into a tropical depression later that day[43] and then degenerated into a remnant low east-southeast of Hawaii, as it became a convectionless vortex.[44] The remnants persisted for almost a week after weakening below tropical depression intensity and eventually brushed Hawaii with little to no effects.[45] Late on July 16, the remnant low of Daniel crossed the International Date Line, and dissipated due to dry air and wind shear two days later.[citation needed]

Hurricane Emilia

Category 4 hurricane (SSHWS)
 
DurationJuly 7 – July 15
Peak intensity140 mph (220 km/h) (1-min);
945 mbar (hPa)

A small but well-defined area of disturbed weather became organized enough to be declared as Tropical Depression Five-E on July 7, about 500 mi (800 km) south-southwest of Acapulco.[46] Later the same day the depression gained sufficient organization to be classified as a tropical storm, receiving the name "Emilia", the fifth named storm of the season.[47] Emilia reached hurricane status early on July 9.[48] and began to rapidly intensify into a Category 3 hurricane as the eastern outflow channel from Daniel that had previously inhibited development weakened and allowed Emilia to ventilate its core in all directions.[49] Early on July 10, Emilia reached its peak intensity as a Category 4 hurricane with sustained winds of 140 mph (220 km/h) and a barometric pressure of 945 mbar.[50] After its peak, Emilia began to fluctuate between a strong Category 2 hurricane and a weak Category 3 hurricane.[51] Although the storm was over cool waters, it was able to maintain this intensity because of its annular structure. However, late on July 12, the eye disappeared from satellite imagery and the storm weakened to a Category 1 hurricane.[52] Early the next morning, it was observed that Emilia passed just north of Daniel's path days earlier, which was a hostile environment. In response to this, the storm dropped to below hurricane status.[53] For a brief period while at tropical storm strength, Emilia passed over a tongue of warmer Sea Surface Temperatures, causing its convection to blossom slightly and weakening to temporarily halt. However, Emilia quickly encountered colder waters and drier air, once again, and weakened to a minimal tropical storm, as a result.[54] Early on July 15, the system transitioned into a post-tropical cyclone, and became an exposed, convectionless vortex.[55] It followed a similar track to Hurricane Daniel. On July 17, the remnant low of Emilia passed south of Hawaii, with little effects.[56]

Hurricane Fabio

Category 2 hurricane (SSHWS)
 
DurationJuly 12 – July 18
Peak intensity105 mph (165 km/h) (1-min);
972 mbar (hPa)

Early on July 12, a well-defined area of low pressure south of Mexico gained enough organization to be declared as Tropical Depression Six-E.[57] Just hours after formation, the sustained winds exceeded 38 miles per hour, and organization became sufficient enough for the depression to be upgraded to Tropical Storm Fabio, the sixth named storm of the season.[58] During the afternoon hours of July 13, Fabio intensified into a Category 1 hurricane, with sustained winds of 80 mph (130 km/h).[59] Later that night, Fabio continued to intensify, and became a strong Category 1 with 90 mph (150 km/h) sustained winds.[60] The storm maintained this intensity for a while, before rapidly and unexpectedly intensifying into a 105 mph (165 km/h) Category 2 hurricane during the afternoon hours of July 14, as it was being noticed that the cyclone's eye became better-defined, the cloud tops cooled and the system became more symmetric.[61] However, less than 24 hours after becoming a Category 2, the storm began ingesting drier air and was situated over cooler waters, causing it to progressively weaken to below hurricane strength.[62] By July 17, the system's center was devoid of most convection and had weakened down to tropical depression status off the coast of central Baja California.[63] The remnant circulation continued northward, however, and associated clouds and moisture began streaming over Southern California on July 18, eventually streaming into Central California and Northern California, until early on July 20, when the remnants left the state, into Nevada.[64] Over the next couple of days, the remnant moisture of Fabio moved into Nevada, Oregon, Western Idaho, and Washington, triggering flash floods across parts of Oregon and Washington. Very early on July 22, the remnant of Fabio was absorbed by a neighboring upper-level low, just of the northwest coast of Washington.[citation needed]

Hurricane Gilma

Category 1 hurricane (SSHWS)
 
DurationAugust 7 – August 11
Peak intensity80 mph (130 km/h) (1-min);
984 mbar (hPa)

Late on August 5, the National Hurricane Center began monitoring an area of disturbed weather about 500 mi (805 km)* south-southwest of Acapulco, Mexico, characterized by disorganized shower and thunderstorm activity.[65] Quick organization occurred, and a day later, the system was given a high chance of tropical cyclone development within 48 hours.[66] After a subsequent increase in shower and thunderstorm activity, the NHC determined that the low had acquired enough organization to be declared a tropical depression at 0600 UTC on August 7.[67] Initially, the depression, which was upgraded to Tropical Storm Gilma early that same day,[68] was forecast to reach cooler sea surface temperatures within four days, limiting the storm's chances of becoming a hurricane. However, following a quicker rate of intensification than originally anticipated, the NHC stated that Gilma had acquired enough organization to be upgraded to the sixth hurricane of the season at 0300 UTC on August 9, simultaneously reaching its peak intensity of 80 mph.[69] [70] Shortly thereafter, the cyclone entered cooler waters, and weakened to a tropical storm during the afternoon hours of the same day.[71] The cyclone further weakened to a tropical depression early on August 11 and transitioned into a post-tropical cyclone that afternoon, well away from land.[72]

Tropical Storm Hector

Tropical storm (SSHWS)
 
DurationAugust 11 – August 17
Peak intensity45 mph (75 km/h) (1-min);
993 mbar (hPa)

A trough of low pressure, formed from the remnants of Hurricane Ernesto in the Atlantic, began to organize, and by the evening hours of August 11, the NHC declared the formation of Tropical Depression Eight-E.[73] The next day, the depression intensified to Tropical Storm Hector, the eighth named storm of the 2012 season.[74] Hector moved slowly towards the west, with slight changes in strength during its entirety. Because of the strong vertical wind shear and marginally warm water around Hector, not much strengthening was anticipated, but instead weakened over the next several days. It never intensified above tropical storm strength, where it remained until further weakening to a tropical depression on August 15.[75] Early the next day on August 17, as Hector lacked numerous thunderstorms surrounding its center, it was declared post-tropical.[76] Hector brought waves up to 12 ft (3.7 m) in the port of Mazatlan, subsequently; authorities restricted botaign access. The storm also brought intervals of heavy showers, gusty winds winds exceeding 40 mph and hot temperatures in most municipalities in Sinaloa.[77] 400 people were evacuated in Los Cabos due to flooding.[78] 100 people were left homeless.[79]

Hurricane Ileana

Category 1 hurricane (SSHWS)
 
DurationAugust 27 – September 2
Peak intensity85 mph (140 km/h) (1-min);
976 mbar (hPa)

The low pressure system that was to become Hurricane Ileana began from a tropical wave that is first monitored by the National Hurricane Center on August 23. Development of the said wave is expected if it reaches more favorable conditions.[80] Moving towards the north-west, the low began to organize, and by August 27, the low organized to become the ninth tropical depression of the season.[81] The depression continued to show signs of organization, and later that day it was upgraded to Tropical Storm Ileana, the ninth named storm of the season.[82] Ileana took advantage of the warm sea surface temperature and low vertical wind shear and became better organized; such substantial strengthening would make Ileana a hurricane, peaking as an 85 mph (145 km/h) Category 1 hurricane on August 29.[83] Ileana would not maintain hurricane strength for long, and, as predicted, weakened back to tropical storm status on August 31 as it began to turn west.[84] Weakening continued as Ileana traversed cooler sea surface temperatures and encountered increasing wind shear and more stable air environment. The storm weakened to a tropical depression on September 2, further weakened into a post-tropical cyclone after failing to sustain deep convection for over twelve hours.[85] During the course of its life, Ileana never threatened land so no casualties or damages were reported.[citation needed]

Tropical Storm John

Tropical storm (SSHWS)
 
DurationSeptember 2 – September 4
Peak intensity40 mph (65 km/h) (1-min);
1001 mbar (hPa)

A large area of low pressure well west of Central America formed on August 29. Over the next couple of days, the system began to slowly organize as it was in an area of favorable conditions for further development.[86] By September 1, another area of low pressure had formed just offshore Mexico, just east of the organizing low, and that same day it eventually absorbed the weaker low; this gives an extra hint for the formation of Tropical Depression Ten-E, which was south of Baja California.[87] The next day, the depression became the tenth storm of the 2012 season; however, no significant strengthening was anticipated because of moderate to high vertical wind shear in addition to the marginally warm sea surface temperature along John's path.[88] John remained a very weak tropical storm; it never exceeded 40 mph winds throughout its lifetime, and the main low level circulation was always separated from the main canopy of thunderstorms due to the increasing easterly wind shear.[89] It only maintained tropical storm intensity for 18 hours; after that it weakened to a tropical depression.[90] It held onto tropical depression status for another 18 hours before becoming post-tropical the following day.[91] John brought rain and wind to the Baja California Peninsula; the Los Cabos port was closed for small craft.[92] Over the next week, John's remnant circulation moved southwestward slowly, before dissipating on September 11. However, the remnant moisture combined with the moonsonal surge around its eastern periphery triggered individual flash flooding events across parts of Southern California, from September 5-11.[citation needed]

Tropical Storm Kristy

Tropical storm (SSHWS)
 
DurationSeptember 12 – September 17
Peak intensity60 mph (95 km/h) (1-min);
998 mbar (hPa)

On September 9, an area of low pressure formed west of Central America. The disturbance was expected to strengthen within the next couple of days, with conditions conducive for development.[93] During the next several days, the low edged a little close towards the coast of Western Mexico, but interaction with land did not inhibit further development of this area of low pressure into the eleventh tropical depression of the season.[94] The depression then became Tropical Storm Kristy that same day. The system was insistent on maintaining its intensity even though structure and organization began to collapse because of the unfavorable environment it encountered.[95] September 16, Kristy was downgraded to a tropical depression, and was declared post-tropical the following day, as from a lack of deep convection. The following day, wind warnings were placed in effect for the Baja Peninisula from the remnants assosiated with Kristy.[96] Kristy also threatened Southern Mexico.[97]

Hurricane Lane

Category 1 hurricane (SSHWS)
 
DurationSeptember 15 – September 19
Peak intensity80 mph (130 km/h) (1-min);
989 mbar (hPa)

Lane formed from an area of low pressure that formed just west of Tropical Storm Kristy on September 13. At first, development was not expected as it was forecast to interact with Tropical Storm Kristy.[98] Nevertheless, the system moved away from Kristy and organized into the twelfth depression of the season, on September 15.[99][100] Twelve-E became better organized that day, and was upgraded to Tropical Storm Lane, the twelfth named storm of the season.[101] At first, Lane was expected to remain a tropical storm before weakening because of it approaching less favorable conditions. However, due to the improving satellite appearance, and some additional intensification overnight, Lane was forecast to become a hurricane within 24 hours. Lane was upgraded to hurricane status at 0900 UTC on Monday, September 17,[102] maintaining that status for approximately 30 hours before being downgraded back to a tropical storm at 1500 UTC Tuesday, September 18.[103]

Hurricane Miriam

Category 3 hurricane (SSHWS)
 
DurationSeptember 22 – September 28
Peak intensity120 mph (195 km/h) (1-min);
958 mbar (hPa)

On September 22, an area of low pressure that had been organizing for a couple of days became defined enough to be declared as Tropical Depression Thirteen-E. It soon strengthened to Tropical Storm Miriam, and began to further intensify over a very favorable environment.[citation needed] On September 23rd, rapid intensification was noted as a distinct possibility[104] as vertical wind shear was forecast to remain under 5 knots for the next 36 hours. Later that evening, Miriam intensified from a 70 mph tropical storm at 2 pm PDT[105] to a 90 mph Category 1 hurricane at 8 pm.[106]. Miriam continued to intensify on the 24th, developing a 10 nautical mile wide eye[107] and by 8 am PDT that day, it became a Category 3 major hurricane with maximum sustained winds of 120 mph.[108] Miriam maintained this intensity for 12 hours before weakening back into a Category 2 at 8 pm PDT the same day.[109] Miriam began to gradually weaken and weakened to a tropical storm with 70 mph winds at 2 am PDT on the 26th.[110] Miriam continued to steadily weaken over colder sea surface temperatures and became a tropical depression on the 27th as the last of the deep convection dissipated[111] and it became a remnant low just 6 hours later.[112]

Tropical Storm Norman

Tropical storm (SSHWS)
 
DurationSeptember 28 – September 29
Peak intensity45 mph (75 km/h) (1-min);
1000 mbar (hPa)
Main article: Tropical Storm Norman (2012)

Early on September 25, the National Hurricane Center began monitoring an area of disturbed weather a few hundred miles south of Acapulco, Mexico. This system originally lacked a well-defined center and was broad in size, but gradually organized as it moved towards the north-northwest.[citation needed] Satellite, ship, and buoy observations early on September 28 revealed that the low had become much better defined, and at 1500 UTC, the first advisory was issued on Tropical Storm Norman, located at the time about 85 mi (135 km) east of Cabo San Lucas, Mexico.[113] Norman weakened as it approached the coast of western Mexico and it became a tropical depression on September 29.[114] The depression made landfall about just west of Topolobampo, but quickly emerged into the Gulf of California.[115] The last of the deep convection associated with Norman dissipated early on September 29,[116] and Norman became a post-tropical remnant low later that day.[117]

Storm names

The following names will be used for named storms that form in the Eastern Pacific in 2012. Retired names, if any, will be announced by the World Meteorological Organization in the spring of 2013. The names not retired from this list will be used again in the 2018 season. This is the same list used in the 2006 season.

  • Ileana
  • John
  • Kristy
  • Lane
  • Miriam
  • Norman
  • Olivia (unused)
  • Paul (unused)
  • Rosa (unused)
  • Sergio (unused)
  • Tara (unused)
  • Vicente (unused)
  • Willa (unused)
  • Xavier (unused)
  • Yolanda (unused)
  • Zeke (unused)

For storms that form in the Central Pacific Hurricane Center's area of responsibility originates around the islands of Hawaii. There are several names that are in four lists; the next four names to be used are shown below.

  • Pewa (unused)
  • Unala (unused)
  • Wali (unused)
  • Ana (unused)

Season effects

This is a table of all of the storms in the 2012 Pacific hurricane season. It includes their durations, peak intensities, names, landfall(s), damages, and death totals. Deaths in parentheses are additional and indirect (an example of an indirect death would be a traffic accident), but are still storm-related. Damage and deaths include totals while the storm was extratropical, a wave, or a low. All of the damage figures are in 2012 USD.

Saffir–Simpson scale
TD TS C1 C2 C3 C4 C5
2012 Pacific hurricane season statistics
Storm
name 		Dates active Storm category
at peak intensity 		Max 1-min
wind
mph (km/h) 		Min.
press.
(mbar) 		Areas affected Damage
(USD) 		Deaths Ref(s)
Aletta May 14 – May 19 Tropical storm 50 (85) 1000 None None None
Bud May 21 – May 26 Category 3 hurricane 115 (185) 960 Western Mexico Minimal None
Carlotta June 14 – June 17 Category 2 hurricane 105 (165) 976 Southern Mexico (Oaxaca) 107.7 7
Daniel July 4 – July 11 Category 3 hurricane 115 (185) 961 None None None
Emilia July 7 – July 15 Category 4 hurricane 140 (220) 945 None None None
Fabio July 12 – July 18 Category 2 hurricane 105 (165) 972 Baja California Peninsula, Western United States Minor None
Gilma August 7 – August 11 Category 1 hurricane 80 (130) 984 None None None
Hector August 11 – August 17 Tropical storm 45 (75) 993 Baja California Peninsula Minimal None
Ileana August 27 – September 2 Category 1 hurricane 85 (140) 976 None None None
John September 2 – September 4 Tropical storm 40 (65) 1001 Baja California Peninsula, Southern Mexico, Western Mexico Minimal None
Kristy September 12 – September 17 Tropical storm 60 (95) 998 Baja California Peninsula Minimal None
Lane September 15 – September 19 Category 1 hurricane 80 (130) 989 None None None
Miriam September 22 – September 28 Category 3 hurricane 120 (195) 958 None None None
Norman September 28 – September 29 Tropical storm 45 (75) 1000 Baja California Peninsula, Western Mexico (Sinaloa) Unknown None
Season aggregates
14 systems May 14 – Currently Active    140 mph (220 km/h) 945 <107.7 7  

Accumulated Cyclone Energy (ACE)

ACE (104kt²) (Source) — Storm:
1 18.0 Emilia 8 4.39 Lane
2 14.7
(0.123) 		Daniel 9 3.51 Carlotta
3 10.1 Fabio 10 2.80 Kristy
4 9.68 Miriam 11 2.02 Hector
5 7.15 Bud 12 1.18 Aletta
6 6.49 Ileana 13 0.368 John
7 4.93 Gilma 14 0.283 Norman
Total: 85.6 (0.123)

The table on the right shows the ACE for each storm in the season. Broadly speaking, the ACE is a measure of the power of a hurricane multiplied by the length of time it existed, so storms that last a long time, as well as particularly strong hurricanes, have high ACEs. ACE is calculated for only full advisories on specifically tropical systems reaching or exceeding wind speeds of 34 knots (39 mph, 63 km/h), or tropical storm strength. Accordingly, tropical depressions are not included here. The ACE also does not include subtropical storms. Later the NHC reexamines the data, and produces a final report on each storm, which can lead to the ACE for a storm being revised either upward or downward. Until the final reports are issued, ACEs are, therefore, provisional.

The figures in parentheses are for storms in the Central Pacific basin west of 140°W; those not in parentheses are for the Eastern Pacific basin.

See also

References

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