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2009 Atlantic hurricane season

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Template:Infobox hurricane season active

The 2009 Atlantic hurricane season is an event in the annual cycle of tropical cyclone formation. The season officially started on June 1 and will end on November 30. These dates conventionally delimit the period of each year when most tropical cyclones form in the Atlantic basin.

The season started early with the formation of Tropical Depression One on May 28; however for second consecutive year, no storms formed in June.

For the first time since 2000, no storms formed in July either. Similarly, no named storms formed before July 31, the first time since 2004.[1]



Seasonal forecasts

Predictions of tropical activity in the 2009 season
Source Date Named
storms 		Hurricanes Major
hurricanes
Average (1950–2000) 9.6 5.9 2.3
Record high activity 28 15 8
Record low activity 4 2 0
–––––––––––––––––––––––––––––––––––––––––––––––––––––––
CSU December 10, 2008 14 7 3
CSU April 7, 2009 12 6 2
NOAA May 21, 2009 9–14 4–7 1–3
CSU June 2, 2009 11 5 2
UKMO June 18, 2009 6* N/A N/A
CSU August 4, 2009 10 4 2
NOAA August 6, 2009 7–11 3–6 1–2
––––––––––––––––––––––––––––––––––––––––––
* July-November only.

Forecasts of hurricane activity are issued before each hurricane season by noted hurricane experts Philip J. Klotzbach, William M. Gray, and their associates at Colorado State University; and separately by NOAA forecasters.

Klotzbach's team (formerly led by Gray) defined the average number of storms per season (1950 to 2000) as 9.6 tropical storms, 5.9 hurricanes, 2.3 major hurricanes (storms reaching at least Category 3 strength in the Saffir-Simpson Hurricane Scale) and ACE Index 96.1.[2] NOAA defines a season as above-normal, near-normal or below-normal by a combination of the number of named storms, the number reaching hurricane strength, the number reaching major hurricane strength and ACE Index.[3]

Pre-season forecasts

On December 10, 2008, Klotzbach's team issued its first extended-range forecast for the 2009 season, predicting above-average activity (14 named storms, 7 hurricanes, 3 of Category 3 or higher and ACE Index of 125). On April 7, 2009, Klotzbach's team issued an updated forecast for the 2009 season, predicting near-average activity (12 named storms, 6 hurricanes, 2 of Category 3 or higher and ACE Index of 100), citing the possible cause as the high probability of a weak El Niño forming during the season.[4] On May 21, 2009, NOAA issued their forecast for the season, predicting near or slightly above average activity, (9 to 14 named storms, 4 to 7 hurricanes, and 1 to 3 of Category 3 or higher).[5]

Midseason outlooks

On June 2, 2009, Klotzbach's team issued another updated forecast for the 2009 season, predicting slightly below average activity (11 named storms, 5 hurricanes, 2 of Category 3 or higher and ACE Index of 85). On June 18, 2009, the UK Met Office (UKMO) issued a forecast of 6 tropical storms in the July to November period with a 70% chance that the number would be in the range 3 to 9. They also predicted an ACE Index of 60 with a 70% chance that the index would be in the range 40 to 80.[6]


Mid-season forecasts

On August 4, 2009, Klotzbach's team updated their forcast for the 2009 season, again predicting slightly below average activity (10 named storms, 4 hurricanes, and 2 major hurricanes). On August 6, 2009, the NOAA also updated their forecast for the 2009 season, predicting below average activity (7-11 named storms, 3-6 hurricanes, and 1-2 major hurricanes).

Storms

Tropical Depression One

Tropical depression (SSHWS)
 
DurationMay 28 – May 29
Peak intensity35 mph (55 km/h) (1-min);
1006 mbar (hPa)
Main article: Tropical Depression One (2009)

On May 28, the National Hurricane Center began issuing advisories on Tropical Depression One. The depression had formed about 400 miles (640 km) east-northeast of the Outer Banks of North Carolina. With relatively favorable conditions, the depression was forecast to strengthen into a tropical storm by early May 29 before dissipating over cooler waters shortly thereafter. However, the system did not reach tropical storm strength, and instead began to rapidly weaken later on the 29th.[7] The depression became extratropical at about 5 p.m. AST (2100 UTC) that same day,[8] and was absorbed by a frontal zone shortly thereafter. Its track, formation, and timing were relatively similar to Tropical Storm One in 1940.[9]

Tropical Depression Two

Tropical Depression Two
Current storm status
Tropical depression (1-min mean)
Satellite image
Forecast map
As of:11 a.m. AST (1500 UTC) August 13
Location:14.0°N 37.6°W ± 20 nm
About 885 mi (1425 km) W of the Cape Verde Islands
Sustained winds:25 knots | 30 mph | 45 km/h (1-min mean)
gusting to 35 knots | 40 mph | 65 km/h
Pressure:1008 mbar (hPa) | 29.77 inHg
Movement:W at 8 kt | 9 mph | 15 km/h
See more detailed information.

On August 11, the National Hurricane Center (NHC) declared that Tropical Depression Two developed in the eastern Atlantic. Since then, forecasts have continually indicated the potential to strengthen to at least minimal tropical storm strength, and thus receiving the name Ana. However, the depression has been encountering horizontal wind shear, leading to its gradual weakening. As of August 13, the low level circulation was greatly exposed, and there were only a few thunderstorms accompanying the depression. Despite this, forecasts from the NHC still show the system has the potential to strengthen to a tropical storm if it can maintain its integrity until it passes the area of wind shear. However, the NHC has noted that if the weakening trend continues, it could be declared a remnant low within the next few advisories.

Current storm information

As of 11 a.m. AST (1500 UTC) August 13, Tropical Depression Two is located within 20 nautical miles of 14.0°N 37.6°W, about 885 mi (1425 km) west of the southernmost Cape Verde Islands. Maximum sustained winds are 25 knots (30 mph, 45 km/h), with stronger gusts. Minimum central pressure is 1008 mbar (hPa; 29.77 InHg), and the system is moving west at 8 kt (9 mph, 15 km/h).

For latest official information see:

Storm names

The following names will be used for named storms that form in the North Atlantic in 2009. Retired names, if any, will be announced by the World Meteorological Organization in the spring of 2010. The names not retired from this list will be used again in the 2015 season. Names that were not used are marked in gray, and names in bold are storms currently active. This is the same list used in the 2003 season with the exception of Fred, Ida, and Joaquin, which replaced Fabian, Isabel, and Juan respectively. If there are more than 21 named storms (the 21st being Wanda) then any more tropical storm-strength systems will be named with the Greek alphabet, starting with Alpha. This has only occurred once, in 2005.

  • Ana (unused)
  • Bill (unused)
  • Claudette (unused)
  • Danny (unused)
  • Erika (unused)
  • Fred (unused)
  • Grace (unused)
  • Henri (unused)
  • Ida (unused)
  • Joaquin (unused)
  • Kate (unused)
  • Larry (unused)
  • Mindy (unused)
  • Nicholas (unused)
  • Odette (unused)
  • Peter (unused)
  • Rose (unused)
  • Sam (unused)
  • Teresa (unused)
  • Victor (unused)
  • Wanda (unused)

Timeline of events

May

May 28

  • 1500 UTC - Tropical Depression One forms offshore North Carolina.

May 29

  • May 29 2100 UTC - Tropical Depression One becomes extratropical.

June

June 1

  • 12 a.m. EDT (0400 UTC) - The 2009 Atlantic hurricane season officially began.

August

August 11

  • 6:00 AM EDT (1000 UTC) - Tropical Depression Two forms near Cape Verde.

Season effects

This is a table of the storms in 2009 and their landfall(s), if any. 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 or a wave or low.

Saffir–Simpson scale
TD TS C1 C2 C3 C4 C5

Template:TC stats table start

|- style="background:#6EC1EA" ! align=left | One | style="text-align:left;background:#FFFFFF; color:black" data-sort-value="May 28 , 2017" | May 28 – May 29 | style="text-align:center;" data-sort-value="5"|Tropical depression | style="text-align:center;" | 35 | style="text-align:center;" | 1006 | style="text-align:left;background:#FFFFFF; color:black" | {{{areas}}} | style="text-align:center;background:#FFFFFF; color:black" data-sort-value=""| {{{damage}}} | style="text-align:center;background:#FFFFFF; color:black" data-sort-value=""| {{{deaths}}} | style="text-align:right;background:#FFFFFF; color:black" data-sort-value="0"| Template:TC stats no landfall Template:TC stats impact

|- style="background:#6EC1EA" ! align=left | Two | style="text-align:left;background:#FFFFFF; color:black" data-sort-value="August 11 , 2017" | August 11 – Still Active | style="text-align:center;" data-sort-value="5"|Tropical depression | style="text-align:center;" | 35 | style="text-align:center;" | 1006 | style="text-align:left;background:#FFFFFF; color:black" | {{{areas}}} | style="text-align:center;background:#FFFFFF; color:black" data-sort-value=""| {{{damage}}} | style="text-align:center;background:#FFFFFF; color:black" data-sort-value=""| {{{deaths}}} | style="text-align:right;background:#FFFFFF; color:black" data-sort-value="0"| Template:TC stats no landfall Template:TC stats impact Template:TC stats table end

See also

Template:Tcportal

Notes

References

  1. ^ Avila, Blake (2009-08-01). "Tropical Weather Summary". National Hurricane Center. Retrieved 2009-08-02.
  2. ^ Philip J. Klotzbach and William M. Gray (2008-12-10). "Extended Range Forecast of Atlantic Seasonal Hurricane Activity and U.S. Landfall Strike Probability for 2009". Colorado State University. Archived from the original (PDF) on 2009-06-12. Retrieved 2009-01-01. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  3. ^ National Hurricane Center (May 22, 2008). "NOAA Atlantic Hurricane Season Classifications". National Oceanic and Atmospheric Administration. Archived from the original on 2009-06-12. Retrieved April 14, 2009. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  4. ^ William M. Gray (2008-04-07). "Mid-Season Forecast of Atlantic Seasonal Hurricane Activity and U.S. Landfall Strike Probability for 2009". Colorado State University. Archived from the original (PDF) on 2009-06-11. Retrieved 2009-04-07. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  5. ^ Ruane, Michael E. (May 21, 2009). "Government Weather Officials Predict Average 2009 Season". Washington Post. {{cite news}}: Cite has empty unknown parameter: |coauthors= (help)
  6. ^ "UKMO North Atlantic tropical storms seasonal forecast for 2009".
  7. ^ Franklin and Beven (May 28, 2009). "Tropical Depression One Discussion Number 1". National Oceanic and Atmospheric Administration. Retrieved 2009-05-28.
  8. ^ Kimberlain and Franklin (May 29, 2009). "Tropical Depression One Discussion Number 6". National Oceanic and Atmospheric Administration. Retrieved 2009-06-01.
  9. ^ Jean H. Gallenne (1940). "Tropical Disturbance of May 18-27, 1940" (PDF). American Meteorological Society Monthly Weather Review. p. 148. Retrieved 2009-06-19.

Template:2000-2009 Atlantic hurricane seasons

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