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#REDIRECT [[2009 Atlantic hurricane season#Tropical Depression One]]
{{Infobox Hurricane

| Name=Tropical Depression One
{{redr|
| Type=Tropical depression
{{r to section}}
| Year=2009
{{r from merge}}
| Basin=Atl
| Image location=Tropical Depression One 2009 GOES.jpg
| Image name=Tropical Depression One at peak intensity
| Alt=Satellite picture of a small cluster of clouds off the U.S. East Coast
| Formed=May 28, 2009
| Dissipated=May 29, 2009
| 1-min winds=30
| Gusts=40
| Pressure=1006
| Damages=None
| Fatalities=None reported
| Areas=Coastal [[North Carolina]]
| Hurricane season=[[2009 Atlantic hurricane season]]
}}
}}
'''Tropical Depression One''' was the first [[tropical cyclone]] to develop during the [[2009 Atlantic hurricane season]]. Upon being declared a tropical depression on May&nbsp;28, it marked the third time that a pre-season storm formed in three consecutive years. Originating from a disorganized [[Low pressure area|area of low pressure]] off the coast of [[North Carolina]], Tropical Depression One quickly developed over the [[Gulf stream]]. After attaining winds of 35&nbsp;mph (55&nbsp;km/h) along with a minimum pressure of 1006&nbsp;mbar (hPa; 29.71&nbsp;inHg), the depression began to weaken due to increasing [[wind shear]] and cooling [[sea surface temperature]]s. During the afternoon of May&nbsp;29, [[Atmospheric convection|convection]] associated with the system was significantly displaced from the [[Eye (cyclone)|center of circulation]]; this led the National Hurricane Center to issue their final advisory on the depression as it had degenerated into a [[Low pressure area|remnant-low pressure area]]. As a tropical cyclone, Tropical Depression One had no effects on land; however, the precursor to the depression brought minor rainfall and light winds to parts of coastal North Carolina. Its track, formation, and timing were relatively similar to [[1940_Atlantic_hurricane_season#Tropical_Storm_One|Tropical Storm One]] of the [[1940 Atlantic hurricane season]].<ref name="a1940">{{cite web|url=http://www.aoml.noaa.gov/general/lib/lib1/nhclib/mwreviews/1940.pdf|title=Tropical Disturbance of May 18–27, 1940|author=Jean H. Gallenne|year=1940|publisher=[[American Meteorological Society]] [[Monthly Weather Review]]|page=148|accessdate=2009-06-19}}</ref>

==Meteorological history==
{{storm path|01-L 2009 track.png|alt=Map of a path across the western Atlantic Ocean, near the East Coast of the United States. Most of the eastern part of the United States, the northern Caribbean islands and Atlantic Canada can be seen in the image.}}
During mid-May, a [[Weather front|frontal boundary]] stalled near [[The Bahamas]] and slowly degenerated. On May&nbsp;25, a [[Trough (meteorology)|shortwave trough]] caused the northern portion of the system to move north of the [[Bahamas]]. The following day, an [[Low pressure area|area of low pressure]] developed along the boundary about 290&nbsp;miles (465&nbsp;km) south-southwest of [[Wilmington, North Carolina]].<ref name="TCR"/> Tracking towards the north, the system became increasingly organized. On May&nbsp;27, the [[National Hurricane Center]] (NHC) began issuing Tropical Weather Outlooks for the low while it was located about 120&nbsp;miles (195&nbsp;kilometers) south of [[Cape Hatteras]], [[North Carolina]].<ref name="TWO1">{{cite web|author=Landsea and Franklin|publisher=National Hurricane Center|date=May 27, 2009|accessdate=May 28, 2009|title=Tropical Weather Outlook for the North Atlantic Ocean: May 27, 2009 8:05AM EST|url=ftp://ftp.met.fsu.edu/pub/weather/tropical/Outlook-A/2009052712.ABNT20}}</ref> An [[High pressure area|upper-level ridge]] situated to the southeast of the system was steering it towards the northeast.<ref name="TWD2">{{cite web|author=Formosa|publisher=National Hurricane Center|date=May 28, 2009|accessdate=May 28, 2009|title=Tropical Weather Discussion for the North Atlantic Ocean: May 28, 2009 2:05AM EST|url=ftp://ftp.met.fsu.edu/pub/weather/tropical/Atl-Dis/2009052805.AXNT20}}</ref> The NHC issued their final outlook on the low around 8&nbsp;pm EDT (0000&nbsp;UTC on May&nbsp;28) while the system was located about 90&nbsp;mi (150&nbsp;km) east of Cape Hatteras, North Carolina, as development of the low was not expected.<ref name="TWO3">{{cite web|author=Berg and Pasch|publisher=National Hurricane Center|date=May 27, 2009|accessdate=May 28, 2009|title=Tropical Weather Outlook for the North Atlantic Ocean: May 27, 2009 7:45PM EST|url=ftp://ftp.met.fsu.edu/pub/weather/tropical/Outlook-A/2009052723.ABNT20}}</ref>

On May&nbsp;28, the NHC once again initiated outlooks on the system as convection quickly redeveloped. Around 11:00&nbsp;am EDT (1500&nbsp;UTC), they designated the system as Tropical Depression One while it was located about 310&nbsp;mi (500&nbsp;km) south of [[Providence, Rhode Island]].<ref name="ADV1">{{cite web|author=Franklin and Beven|publisher=National Hurricane Center|date=May 28, 2009|accessdate=May 28, 2009|title=Tropical Depression One Public Advisory One|url=http://www.nhc.noaa.gov/archive/2009/al01/al012009.public.001.shtml?}}</ref> Upon being classified, the depression exhibited deep convective activity, with the [[eye (cyclone)|center of circulation]] situated on the northwestern edge. The redevelopment of the system was the result of low [[wind shear]] and warm waters, up to {{convert|26|C|F|abbr=on}}, from the [[Gulf Stream]].<ref name="D1">{{cite web|author=Franklin and Beven|publisher=National Hurricane Center|date=May 28, 2009|accessdate=May 28, 2009|title=Tropical Depression One Discussion One|url=http://www.nhc.noaa.gov/archive/2009/al01/al012009.discus.001.shtml?}}</ref> Later that day, convection began to diminish as the depression tracked into an area of progressively higher shear and cooler waters. By this time, the system was embedded within the [[westerlies]] between a [[Ridge (meteorology)|subtropical ridge]] to the southeast and a [[Trough (meteorology)|trough]] to the northwest.<ref name="D2">{{cite web|author=Jack Beven|publisher=National Hurricane Center|date=May 28, 2009|accessdate=May 29, 2009|title=Tropical Depression One Discussion Two|url=http://www.nhc.noaa.gov/archive/2009/al01/al012009.discus.002.shtml?}}</ref> Around 7:30&nbsp;pm EDT (2330&nbsp;UTC), a [[QuickSCAT]] satellite pass over the depression found [[Tropical cyclone#Tropical Storm|tropical storm-force winds]]; however, the winds were determined to have been affected by rain and therefore not representative of the depression's actual intensity. Following the satellite pass, the center of circulation became partially exposed to the northwest and the area of convection associated with the depression diminished in area.<ref name="D3">{{cite web|author=Robbie Berg|publisher=National Hurricane Center|date=May 29, 2009|accessdate=May 29, 2009|title=Tropical Depression One Discussion Three|url=http://www.nhc.noaa.gov/archive/2009/al01/al012009.discus.003.shtml?}}</ref>

[[File:Precursor to TD 1 2009.jpg|thumb|180px|right|The precursor to Tropical Depression One on May&nbsp;27|alt=Satellite image of a sprawling, disorganized area of clouds along the East Coast of the United States.]]
Early on May&nbsp;29, Tropical Depression One nearly attained tropical storm status, with intensity estimates using the [[Dvorak Technique]] reaching T2.5, or 40&nbsp;mph (65&nbsp;km/h); however, the estimates were also as low as T1.5, leading to the intensity of the depression remaining at 35&nbsp;mph (55&nbsp;km/h). After a burst in convective activity overnight, shower and thunderstorm activity waned once more by 3:00&nbsp;am EDT (0700&nbsp;UTC). Situated at the edge of the Gulf Stream, intensification into a tropical storm was no longer anticipated.<ref name="D4">{{cite web|author=Brennan and Brown|publisher=National Hurricane Center|date=May 29, 2009|accessdate=May 29, 2009|title=Tropical Depression One Discussion Four|url=http://www.nhc.noaa.gov/archive/2009/al01/al012009.discus.004.shtml?}}</ref> Later that morning, the center of circulation became fully exposed by strong wind shear; an approaching trough also began absorbing the small depression by this time. The remaining convection associated with the system was displaced to the southeast.<ref name="D5">{{cite web|author=Kimberlain and Berg|publisher=National Hurricane Center|date=May 29, 2009|accessdate=May 29, 2009|title=Tropical Depression One Discussion Five|url=http://www.nhc.noaa.gov/archive/2009/al01/al012009.discus.005.shtml?}}</ref> With no convection developing around the depression, it degenerated into a [[Low pressure area|remnant-low pressure area]] during the afternoon of May&nbsp;29. At 5:00&nbsp;pm EDT (2100&nbsp;UTC) the NHC issued their final advisory on Tropical Depression One.<ref name="D6">{{cite web|author=Kimberlain and Franklin|publisher=National Hurricane Center|date=May 29, 2009|accessdate=May 29, 2009|title=Tropical Depression One Discussion Six (Final)|url=http://www.nhc.noaa.gov/archive/2009/al01/al012009.discus.006.shtml?}}</ref> The remnants of the depression persisted until 2&nbsp;am EDT (0600&nbsp;UTC) on May 30, at which time it was absorbed by a [[warm front]], south of [[Nova Scotia]].<ref name="TCR">{{cite web|author=Robbie Berg|publisher=National Hurricane Center|date=June 12, 2009|accessdate=June 12, 2009|title=Tropical Depression One Tropical Cyclone Report|url=http://www.nhc.noaa.gov/pdf/TCR-AL012009_One.pdf|format=[[PDF]]}}</ref>

==Preparations, impact and records==
The precursor to Tropical Depression One produced light showers over parts of [[North Carolina]] on May&nbsp;27.<ref name="TWD2"/> Rainfall in [[Hatteras, North Carolina|Hatteras]] amounted to {{convert|0.1|in|mm|abbr=on}} on May&nbsp;27; sustained wind reached {{convert|15|mph|km/h|abbr=on}} and gusts were measured up to {{convert|23|mph|km/h|abbr=on}}. The lowest [[Atmospheric pressure#Mean sea level pressure|sea level pressure]] recorded in relation to the system was 1009&nbsp;[[Bar (unit)|mbar]] ([[Pascal (unit)|hPa]]; 29.81&nbsp;[[Inches of mercury|inHg]]).<ref>{{cite web|publisher=Weather Underground|date=May 27, 2008|accessdate=May 28, 2009|title=History for Hatteras, NC: May 27, 2009 Weather|url=http://www.wunderground.com/history/airport/KHSE/2009/5/27/DailyHistory.html?req_city=NA&req_state=NA&req_statename=NA}}</ref> Increased winds along coastal areas of the state was possible in relation to the outer edges of the depression.<ref>{{cite web|author=Rob Nucatola|publisher=WCTV|date=May 28, 2009|accessdate=May 28, 2009|title=Tropical Depression One Forms|url=http://www.webcitation.org/5h7377FWa}}</ref> Tropical Depression One was the farthest north a May tropical cyclone is known to have formed, according to the NHC's Tropical Cyclone Report.<ref name="TCR"/>

==See also==
{{Portal|Tropical cyclones}}
*[[List of off-season Atlantic hurricanes]]

==References==
{{Reflist|2}}

==External links==
{{Commons category}}
*[http://www.nhc.noaa.gov/archive/2009/ONE.shtml? The National Hurricane Center's advisory archive for Tropical Depression One]
*[http://www.nhc.noaa.gov/pdf/TCR-AL012009_One.pdf The National Hurricane Center's Tropical Cyclone Report on Tropical Depression One]

{{Off-season Atlantic hurricanes}}
{{2009 Atlantic hurricane season buttons}}

{{Good article}}

{{DEFAULTSORT:1 (2009)}}
[[Category:Atlantic tropical depressions]]
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[[Category:2009 Atlantic hurricane season]]
[[Category:Off-season Atlantic tropical cyclones]]
[[Category:Hurricanes in North Carolina]]

[[ca:Depressió tropical One (2009)]]
[[es:Depresión tropical Uno (2009)]]
[[eu:Lehen depresio tropikala (2009)]]
[[fr:Dépression tropicale Un (2009)]]
[[ru:Тропическая депрессия 1 (2009)]]
[[simple:Tropical Depression One (2009)]]

Latest revision as of 18:02, 8 June 2024

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