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Hurricane Isaac (2012)

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Tropical Storm Isaac
Current storm status
Tropical storm (1-min mean)
Satellite image
Forecast map
As of:4 p.m. CDT (2100 UTC) August 29
Location:30.0°N 91.1°W ± 15 nm
About 35 mi (60 km) S of Baton Rouge, Louisiana
About 60 mi (95 km) W of New Orleans, Louisiana
Sustained winds:60 knots (70 mph; 110 km/h) (1-min mean)
gusting to 75 knots (85 mph; 135 km/h)
Pressure:975 mbar (hPa; 28.79 inHg)
Movement:NW at 5 kt (6 mph; 9 km/h)
See more detailed information.

Hurricane Isaac is currently affecting the northern Gulf Coast of the United States, including the western Florida Panhandle, Alabama, Mississippi and Louisiana. The ninth tropical cyclone and ninth named storm of the 2012 Atlantic hurricane season, Isaac developed from a tropical wave located east of the Lesser Antilles on August 21, strengthening into a tropical storm later that day. Isaac passed over Hispaniola and Cuba as a strong tropical storm, killing at least 29 individuals, as it entered the Gulf of Mexico. Isaac reached hurricane strength the morning of August 28. The storm made its first U.S. landfall at 6:45 p.m. CDT that evening (2345 UTC), near the mouth of the Mississippi River. It made a second and final landfall at 2:00 a.m. CDT (0700 UTC) the next morning at Port Fourchon, Louisiana.

Meteorological history

Map plotting the storm's track and intensity, according to the Saffir–Simpson scale
Map key
  Tropical depression (≤38 mph, ≤62 km/h)
  Tropical storm (39–73 mph, 63–118 km/h)
  Category 1 (74–95 mph, 119–153 km/h)
  Category 2 (96–110 mph, 154–177 km/h)
  Category 3 (111–129 mph, 178–208 km/h)
  Category 4 (130–156 mph, 209–251 km/h)
  Category 5 (≥157 mph, ≥252 km/h)
  Unknown
Storm type
triangle Extratropical cyclone, remnant low, tropical disturbance, or monsoon depression

A tropical wave crossed the west coast of Africa between August 15 and August 16.[1] Later that day and early on August 17, the system began developing more convection, while located just west of Sierra Leone. As a result, the National Hurricane Center (NHC) began monitoring the system in the Tropical Weather Outlooks (TWOs).[2] Thereafter, further organization briefly halted, though by early on August 18, associated convection became more concentrated.[3] On the following day, the wave reached a "high" probability of tropical cyclogenesis.[4] Between early on August 19 and early on August 21, minimal structural improvement occurred, despite increases in development probability.[5] By August 21, the system developed enough organization for the NHC to initiate advisories on Tropical Depression Nine; at the time, the depression was located about 715 mi (1150 km) east of the Leeward Islands, moving westward to the south of a large ridge. Conditions were generally favorable for further intensification, with the exception of northeasterly wind shear.[6]

Late on August 21, a Hurricane Hunters mission observed flight-level winds of 51 mph (84 km/h), and on this basis the NHC upgraded the depression to Tropical Storm Isaac. Despite its intensification, the storm was disorganized with its center located north of the deepest convection.[7] The circulation became elongated early on August 22, and the storm absorbed drier air in its northeast quadrant.[8] Later that day, the low pressure area passed just south of Guadeloupe and into the Caribbean Sea.[9] Dry air continued to hinder convection,[7] although Isaac gradually became better organized.[10] By late on August 24, the Hurricane Hunters observed a well-defined circulation; by that time, however, the strongest convection was moving over Hispaniola.[11] An eye feature developed early on August 25,[12] and Isaac attained winds of 70 mph (110 km/h) before crossing the southwestern peninsula of Haiti.[13]

While moving across Haiti, the circulation of Isaac became disrupted while the convection became disorganized.[14] Continuing to the northwest, the storm moved along the north coast of Cuba.[15] Convection increased over the center by early on August 26, and Isaac re-intensified slightly while entering the Straits of Florida.[16] However, continued dry air prevented the inner core of convection from developing. Hurricane Hunters reported that a ragged eye developed multiple times, but the feature was unable to persist. The storm tracked northwestward across the Gulf of Mexico due to a subtropical ridge to its north.[17] Although the barometric pressure continued to decrease, Isaac remained a large storm, which contributed to the lack of strengthening.[18] At about 1620 UTC (11:20 a.m. CDT) on August 28, Isaac attained hurricane status about 75 mi (115 km) south-southeast of the mouth of the Mississippi River, based on data from the Hurricane Hunters.[19]

After further intensification, Isaac made landfall at 2345 UTC (6:45 p.m. CDT) on August 28, just southwest of the mouth of the Mississippi River with winds of 80 mph (130 km/h).[20] The eye moved over water a few hours later,[21] before Isaac struck Louisiana again just west of Port Fourchon at 0715 UTC (2:15 a.m. CDT) on August 29.[22] Hours after it made landfall, Isaac's eye became less circular and was open on the western side.[23] The storm dropped to tropical storm status at 1900 UTC.All hurricane advisories were discontinued after that

Current storm information

As of 4 p.m. CDT (2100 UTC) August 29, Tropical Storm Isaac is located within 15 nautical miles of 30°00′N 91°06′W / 30.0°N 91.1°W / 30.0; -91.1 (Isaac), about 35 mi (60 km) south of Baton Rouge, Louisiana, and about 60 mi (95 km) west of New Orleans, Louisiana. Maximum sustained winds are 60 knots (70 mph, 110 km/h), with stronger gusts. Minimum central pressure is 975 mbar (hPa; 28.79 InHg), and the system is moving northwest at 5 kt (6 mph, 9 km/h).

Tropical storm force winds extend outward up to 175 miles (280 km) from the center of Isaac.

For latest official information see:

Watches and warnings

Template:HurricaneWarningsTable

Preparations

Lesser Antilles

Upon the first advisory at 0900 UTC on August 21, a tropical storm watch was issued for the British Virgin Islands, Puerto Rico and the United States Virgin Islands, as well as Saba, Sint Eustatius, and Sint Maarten. Additionally, a tropical storm warning was put into effect for Antigua, Barbuda, Dominica, dependencies of Guadeloupe, Montserrat, Nevis, Saint Kitts, and Saint Martin.[24] By 0910 UTC, the Government of Anguilla issued a tropical storm warning for Anguilla.[25] Later that day, the tropical storm watch in effect for Saba, Sint Eustatius, and Sint Maarten was upgraded to a tropical storm warning. Simultaneously, the Government of France issued a tropical storm warning for Martinique.[26] Early on August 22, the tropical storm watch for the British Virgin Islands, Puerto Rico, and the United States Virgin Islands was upgraded to a tropical storm warning. Around that time, a hurricane watch was also issued for Puerto Rico and the United States Virgin Islands.[27]

Greater Antilles and The Bahamas

At 0900 UTC on August 22, the government of the Dominican Republic issued a tropical storm watch along the north coast of the Dominican Republic, from the border with Haiti eastward to Saona Island. Simultaneously, a hurricane watch was put into place on the south coast, also extending from the Haitian border to Saona Island.[28] At Guantanamo Bay Naval Base, a trial for five prisoners, who allegedly planned the September 11 attacks, was postponed.[29]

At 1030 UTC on August 24, the government of Jamaica issued a tropical storm watch for the entire island of Jamaica.[30] Early on the following day, the Cayman Islands Meteorological Service designated the Cayman Islands under a tropical storm watch.[31] Several hours later on August 25, the tropical storm watches for both Jamaica and the Cayman Islands were discontinued.[32][33]

Gulf of Mexico

Oil production in the Gulf of Mexico was down by 24 percent and gas off by 8, as several major companies (including BP and Shell) evacuated their installations in the eastern part of the basin. Overall, at least 39 (7 percent) of 596 production platforms and eight (11 percent) of 76 Gulf oil rigs were evacuated in the Gulf on August 26. [34] By the evening of August 27, approximately 78% of the Gulf's crude oil production and 48% of its natural gas production had been closed. [35]

United States

Florida

At 2100 UTC on August 24, a tropical storm watch was issued for all of Florida south of the Jupiter Inlet on the east coast and south of Bonita Springs; it also included Lake Okeechobee and the Florida Keys.[36] Early on the next day, the tropical storm watch was upgraded to a warning, while the Florida Keys and the mainland from Ocean Reef to Bonita Springs was now under a hurricane watch. Further north, a tropical storm watch was issued from the Jupiter Inlet to the Sebastian Inlet.[31] Later on August 25, the hurricane watch was switched to a warning, while a separate hurricane watch was issued from Golden Beach southward.[37]

Isaac also poses a threat to the 2012 Republican National Convention (RNC), which is being held in Tampa, Florida during the week of August 27, 2012. According to the Republican National Convention spokesman James Davis, officials have been coordinating with the United States Secret Service, should the 50,000 politicians, delegates, and reporters require evacuation.[38] The Republican National Convention was pushed to August 28, 2012 with the storms threatening the coast of Tampa.[39] Orange juice prices also increased due to the threat of the storm in Florida, which produces more than 75 percent of orange crops in the United States.[29] On August 25, Florida Governor Rick Scott declared a state of emergency for the state of Florida ahead of Tropical Storm Isaac. Amtrak suspended the Silver Meteor and Silver Star train service from Orlando to Miami on Sunday, August 26th.[40]

On August 25, the chairman of the RNC Reince Priebus announced the convention would only convene for a short amount of time on August 27 and "immediately recess until Tuesday afternoon, August 28". At the same time, Governor Scott announced he will not be attending the convention, together with Alabama governor Robert J. Bentley. [41][42]

Louisiana

Louisiana Governor Bobby Jindal declared a state of emergency for Louisiana on August 26.[43] Later that day, reports of exposed levees in Louisiana began surfacing from local news outlets. Crews were reportedly dispatched to cover the exposed dirt with heavy plastic and fill gaps in the levees with Hesco bastions.[44][45] A mandatory evacuation was ordered for St. Charles Parish and for the east bank of Plaquemines Parish and in Lafourche Parish below the Leon Theriot floodgates in Golden Meadow.[46][47] 4,000 National Guard troops have been activated in the state.[48] Governor Jindal announced that he would not be attending the 2012 Republican National Convention and will remain in his state to take care of storm-related problems.[49] On August 27, President Obama ordered federal aid to Louisiana to supplement state and local response efforts due to the emergency conditions resulting from Tropical Storm Isaac beginning on August 26, 2012, and continuing.[50] Governor Jindal on August 27 sent a letter to the Obama administration that the declaration fell short of the help he was requesting.[51] Gov. Jindal has temporarily suspended Louisiana's licensing requirements for emergency medical technicians, to let medical assistance officials from other states help Louisiana respond to Hurricane Isaac. Louisiana Commissioner of Administration Paul Rainwater announced that all state government offices will be closed August 29.[52]

The US Army Corps of Engineers closed the Seabrook Floodgate and the IHNC Lake Borgne Surge Barrier to protect the New Orleans area from a storm surge.[53]

Mississippi

Mississippi Governor Phil Bryant declared a state of emergency the evening of August 26,[54] The governor ordered mandatory evacuations to begin at 8 a.m. CT (9 a.m. ET) on August 27 for residents along the coast and in some low-lying areas inland.[55] On August 27, the Jackson County Board of Supervisors ordered a mandatory evacuation of all areas south of U.S. Route 90. It included all areas south of US 90 in Ocean Springs, Mississippi, Gautier, Mississippi and Pascagoula, Mississippi. The evacuation was in effect as of 4pm CT.[56] Officials dispatched 1,500 National Guard troops to the state's three southern counties, as well as 45 state troopers to ease traffic flow.[57] On August 28, the president signed an emergency declaration for the state of Mississippi.[58]

Alabama

Alabama Governor Robert J. Bentley declared a state of emergency ahead of Isaac.[59] Mandatory evacuations for Baldwin and Mobile counties beginning at 8:00 a.m. on August 27 for zones one and two.[60] Governor Bentley soon announced that he would not be attending the 2012 Republican National Convention, and will remain in his state to take care of storm-related problems.[41][42][61] On August 28, Governor Bentley lifted the mandatory evacuation orders covering southern Baldwin and Mobile counties and issued voluntary orders for areas vulnerable to Isaac’s expected impact.[62]

Impact

Effects by Area
Country/Region Deaths
Dominican Republic 5
Haiti 24–29
Puerto Rico 0 (1)
Florida 0 (2)
Total 29–34 (3)

Lesser Antilles

In Martinique, a meteorologist reported at least 3 inches (76 mm) of rain. One indirect fatality occurred in Puerto Rico after a 75-year-old woman fell from a second-floor balcony in Bayamón while preparing for the storm. In Naguabo, minor coastal flooding had resulted in at least one road closure. Scattered to widespread power outages were also confirmed throughout Puerto Rico.[63]

Greater Antilles

Authorities estimated at least 30,000 residents were evacuated across the island of Hispaniola.[64]

Haiti

Isaac swept across Haiti's southern peninsula, bringing flooding and storms in areas affected by the January 2010 earthquake. A woman and a child died in the town of Souvenance, and a 10-year-old girl died in Thomazeau when a wall fell on her. A seven-year-old boy was electrocuted in the city of Gonaives.[65] As many as 5,000 people were evacuated because of flooding, as scores of tents in quake settlement camps collapsed and at least 300 houses were flooded in the Port-au-Prince shantytown of Cité Soleil. Doctors Without Borders announced it anticipated a spike in cholera cases due to flooding and it was preparing to receive more patients. President Michel Martelly canceled his trip to Japan to coordinate emergency response efforts and visit residents with Prime Minister Laurent Lamothe.[66][67][68]

On August 26, the Haitian government announced that at least 14,000 people had left their homes, while another 13,500 were living in emergency shelters. According to official figures, at least a dozen houses were destroyed and 269 damaged during the storm.[69] On August 28, the death toll in Haiti was revised up to at least 24, with three others missing. News reports in the area stated up to 29 deaths, however.[70]

Dominican Republic

Waves from Tropical Storm Isaac battering the coast of the Dominican Republic.

Authorities in the Dominican Republic evacuated nearly 7,800 people from low-lying areas, and at least 10 rural settlements were cut off by flooding. Parts of Santo Domingo lost electricity during the height of the storm. At least five fatalities were reported, including three men who drowned in flooded rivers, while 49 homes were destroyed throughout the country.[71][72][73]

Cuba

The center of the storm crossed Cuba 28 miles (45 km) west of Maisí, the extreme eastern tip of the island, according to state television. In Baracoa, the electricity was cut off as a preventive measure, and at least two houses were destroyed by flooding. Authorities announced 230 people were in emergency shelters. Intermittent rains and gusty winds were present even in Havana, almost 560 miles (900 km) away.[74]

United States

As of 8:30 A.M. (CT) Wednesday, more than 522,000 customers were without power across four states.[75]

Florida

Palm Beach County

The storm dropped heavy rainfall in Palm Beach County, with many areas reporting at least 7 inches (180 mm) and an estimated peak total of 18.07 inches (459 mm) near the center of the county.[76] Additionally, winds left at least 16,900 customers in Palm Beach County without electricity.[citation needed] In Tequesta, wind gusts were estimated to have reached 60 mph (97 km/h). Additionally, winds in the area blew significant amounts of sand away, exposing rocks and created 8–10 feet (2.4–3.0 m) drops. Slightly further south, waves of 8–10 feet (2.4–3.0 m) pounded the beaches of Jupiter. Only minimal beach erosion was reported, but hundreds of sea turtle nests were swept away.[77] A man died in West Palm Beach after driving through the storm and crashing into a concrete wall along Interstate 95.[78]

Elsewhere in the state

On August 27, an EF0 tornado touched down near Vero Beach and damaged several mobile homes.[79]

Louisiana

Mississippi

  • A 8.3-foot (250 cm) storm surge was reported in Hancock County as of Tuesday evening.[82]
  • Three adults and one infant in Mississippi were rescued overnight from a houseboat.[83]
  • There are about 2,132 evacuees housed in 31 shelters across the state and about 4,000 homes were without power as of 5:30 a.m. CT.[84]

Alabama

References

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See also