Tropical Storm Danny was a weak and disorganized

tropical cyclone A tropical cyclone is a rapidly rotating storm system characterized by a low-pressure center, a closed low-level atmospheric circulation, strong winds, and a spiral arrangement of thunderstorms that produce heavy rain and squalls. Depend ...

that formed in August 2009. The fifth tropical depression and fourth named storm of the 2009 Atlantic hurricane season, Danny developed on August 26 from the interaction between a westward-moving

tropical wave A tropical wave (also called easterly wave, tropical easterly wave, and African easterly wave), in and around the Atlantic Ocean, is a type of atmospheric trough, an elongated area of relatively low air pressure, oriented north to south, which ...

and an upper-level

trough Trough may refer to: In science * Trough (geology), a long depression less steep than a trench * Trough (meteorology), an elongated region of low atmospheric pressure * Trough (physics), the lowest point on a wave * Trough level (medicine), the l ...

while situated east of the

Bahamas The Bahamas (), officially the Commonwealth of The Bahamas, is an island country within the Lucayan Archipelago of the West Indies in the Atlantic Ocean, North Atlantic. It takes up 97% of the Lucayan Archipelago's land area and is home to ...

. The storm never fully matured, and resembled a subtropical cyclone. It meandered generally northwestward before being absorbed into another weather system on August 29. Danny had only minor effects on land. However, it triggered high surf and rip currents from

Florida Florida is a state located in the Southeastern region of the United States. Florida is bordered to the west by the Gulf of Mexico, to the northwest by Alabama, to the north by Georgia, to the east by the Bahamas and Atlantic Ocean, and to ...

through the Mid-Atlantic states, leading to the death of a 12-year-old boy in

North Carolina North Carolina () is a state in the Southeastern region of the United States. The state is the 28th largest and 9th-most populous of the United States. It is bordered by Virginia to the north, the Atlantic Ocean to the east, Georgia and So ...

. The cyclone's remnants contributed to widespread rainfall in the northeast United States. At one point, some weather forecasts predicted Danny to rapidly strengthen, and hit Nantucket as a Category 1 hurricane, although this never occurred. Localized flooding was reported, particularly in

Pennsylvania Pennsylvania (; ( Pennsylvania Dutch: )), officially the Commonwealth of Pennsylvania, is a state spanning the Mid-Atlantic, Northeastern, Appalachian, and Great Lakes regions of the United States. It borders Delaware to its southeast, ...

. It later caused heavy precipitation and power outages in

Atlantic Canada Atlantic Canada, also called the Atlantic provinces (french: provinces de l'Atlantique), is the region of Eastern Canada comprising the provinces located on the Atlantic coast, excluding Quebec. The four provinces are New Brunswick, Newfoundlan ...

Meteorological history

Danny originated in a

that exited the west coast of

Africa Africa is the world's second-largest and second-most populous continent, after Asia in both cases. At about 30.3 million km2 (11.7 million square miles) including adjacent islands, it covers 6% of Earth's total surface area ...

on August 18. Convective activity associated with the system briefly began to organize on August 22, but wind shear soon halted further development. On August 24, thunderstorms once again increased as the disturbance interacted with an upper-level

. On August 25, a Hurricane Hunters mission into the system revealed a broad area of tropical-storm force winds, but no closed circulation center. However, around 0900 UTC on August 26, satellite imagery and QuikSCAT data indicated that a closed low had formed. While situated about east of

Nassau, Bahamas Nassau ( ) is the capital and largest city of the Bahamas. With a population of 274,400 as of 2016, or just over 70% of the entire population of the Bahamas, Nassau is commonly defined as a primate city, dwarfing all other towns in the country. ...

, the feature was declared a tropical storm—skipping the tropical depression stage. Due to the interaction of the initial wave and the upper-level trough, Danny maintained a "non-classical" structure resembling that of a subtropical cyclone. Even after its designation as a tropical storm, the storm was highly disorganized. Little or no deep thunderstorm activity surrounded the center, and the highest winds were confined to a

rainband A rainband is a cloud and precipitation structure associated with an area of rainfall which is significantly elongated. Rainbands can be stratiform or convective, and are generated by differences in temperature. When noted on weather radar ima ...

in the northern semicircle of the cyclone. The storm moved erratically northwestward throughout the day on August 26, strengthening only slightly. Danny's center reformed several times, making it difficult to determine its direction of movement. By early on August 27, the tropical storm became slightly better organized, although the most intense winds were still removed from the center. Danny peaked with

maximum sustained winds The maximum sustained wind associated with a tropical cyclone is a common indicator of the intensity of the storm. Within a mature tropical cyclone, it is found within the eyewall at a distance defined as the radius of maximum wind, or RMW. Unl ...

of 60 mph (95 km/h) and a minimum pressure of 1006 mbar (hPa; 29.71 inHg). It held this strength for about 12 hours before reinvigorated shear caused the storm to gradually weaken as it meandered northward. By August 28, Danny further deteriorated, and reconnaissance aircraft found that it was barely a tropical storm. After stalling during the afternoon, the center resumed a north or north-northwestward drift. Tropical Storm Danny 2009-08-28 1540Z

A strong upper-level trough moving through the southeastern United States forced Danny northeastward. It also triggered the formation of another low pressure system near the coast of

early on August 29. Although this low formed within Danny's cyclonic envelope, satellite imagery indicated that it did not have the characteristics of a tropical cyclone. Therefore, it is not considered to be a continuation of Danny. The new low caused the tropical storm to degenerate into a trough about 275 mi (445 km) southeast of

Wilmington, North Carolina Wilmington is a port city in and the county seat of New Hanover County in coastal southeastern North Carolina, United States. With a population of 115,451 at the 2020 census, it is the eighth most populous city in the state. Wilmington is the ...

, and Danny's remnants were absorbed into a developing frontal zone shortly thereafter.

Impact

In advance of the cyclone, a

tropical storm watch Tropical cyclone warnings and watches are alerts issued by national weather forecasting bodies to coastal areas threatened by the imminent approach of a tropical cyclone of tropical storm or hurricane intensity. They are notices to the local popul ...

was posted for

from Cape Lookout to the town of

Duck Duck is the common name for numerous species of waterfowl in the family Anatidae. Ducks are generally smaller and shorter-necked than swans and geese, which are members of the same family. Divided among several subfamilies, they are a form t ...

at 2100 UTC on August 27. It was discontinued on August 29. As the storm remained offshore, its effects were limited. However, it generated strong rip currents and high waves along the

U.S. East Coast The East Coast of the United States, also known as the Eastern Seaboard, the Atlantic Coast, and the Atlantic Seaboard, is the coastline along which the Eastern United States meets the Atlantic Ocean, North Atlantic Ocean. The eastern seaboard ...

which may have resulted in the drowning death of a 12-year-old boy near

Corolla, North Carolina Corolla ( ) is an unincorporated community located in Poplar Branch township, Currituck County, North Carolina, United States, along the northern Outer Banks. It has a permanent population of approximately 500 people; during the summer vacat ...

, on August 28. On September 1, the

Currituck County Currituck County ()
, from the North Carolina Collection's website at the

's Atlantic coast. High surf and rip currents also affected the Mid-Atlantic states, prompting officials to issue bathing restrictions. A surfer in Monmouth County, New Jersey, broke his leg in the rough conditions. The remnants of the storm interacted with a frontal boundary, triggering widespread precipitation across numerous states. In Delaware County, Pennsylvania, torrential rainfall produced flash flooding that trapped one family in their basement. A creek near

Philadelphia Philadelphia, often called Philly, is the largest city in the Commonwealth of Pennsylvania, the sixth-largest city in the U.S., the second-largest city in both the Northeast megalopolis and Mid-Atlantic regions after New York City. Sinc ...

overflowed its banks and caused minor flooding. Several roads in Lehigh County, including one lane of

U.S. Route 222 U.S. Route 222 (US 222) is a U.S. Highway that is a spur of US 22 in the states of Maryland and Pennsylvania. It runs for from US 1 in Conowingo, Maryland, north to Interstate 78 (I-78)/Pennsylvania Route 309 (PA 309) in Dorneyville, Pennsylvan ...

, were closed due to flood waters. Flooding also took place in New Jersey; numerous basements were submerged and motorists in Camden County had to be rescued from their vehicles. In

Maryland Maryland ( ) is a state in the Mid-Atlantic region of the United States. It shares borders with Virginia, West Virginia, and the District of Columbia to its south and west; Pennsylvania to its north; and Delaware and the Atlantic Ocean to ...

, rainfall peaked at . The extratropical system impacted

New England New England is a region comprising six states in the Northeastern United States: Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island, and Vermont. It is bordered by the state of New York to the west and by the Canadian provinces ...

with high winds and heavy rainfall. At least of rain fell in

Massachusetts Massachusetts (Massachusett language, Massachusett: ''Muhsachuweesut assachusett writing systems, məhswatʃəwiːsət'' English: , ), officially the Commonwealth of Massachusetts, is the most populous U.S. state, state in the New England ...

and

Rhode Island Rhode Island (, like ''road'') is a U.S. state, state in the New England region of the Northeastern United States. It is the List of U.S. states by area, smallest U.S. state by area and the List of states and territories of the United States ...

. Some roads throughout the region became impassable due to standing water. A site in the

Nantucket Sound Nantucket Sound_(geography), Sound is a roughly triangular area of the Atlantic Ocean offshore from the U.S. state of Massachusetts. It is long and wide, and is enclosed by Cape Cod on the north, Nantucket on the south, and Martha's Vineyard on ...

recorded a wind gust to . The former tropical cyclone produced wind gusts of in

Maine Maine () is a state in the New England and Northeastern regions of the United States. It borders New Hampshire to the west, the Gulf of Maine to the southeast, and the Canadian provinces of New Brunswick and Quebec to the northeast and north ...

, toppling trees and ripping boats from their moorings at a harbor in Eastport. Danny's remnants later caused heavy rain across

. At

Saint John, New Brunswick Saint John is a seaport city of the Atlantic Ocean located on the Bay of Fundy in the province of New Brunswick, Canada. Saint John is the oldest incorporated city in Canada, established by royal charter on May 18, 1785, during the reign of Ki ...

, of rain flooded at least 50 basements. The Meteorological Service of Canada hoisted several weather advisories for

New Brunswick New Brunswick (french: Nouveau-Brunswick, , locally ) is one of the thirteen provinces and territories of Canada. It is one of the three Maritime provinces and one of the four Atlantic provinces. It is the only province with both English and ...

Newfoundland Newfoundland and Labrador (; french: Terre-Neuve-et-Labrador; frequently abbreviated as NL) is the easternmost province of Canada, in the country's Atlantic region. The province comprises the island of Newfoundland and the continental region ...

Prince Edward Island Prince Edward Island (PEI; ) is one of the thirteen Provinces and territories of Canada, provinces and territories of Canada. It is the smallest province in terms of land area and population, but the most densely populated. The island has seve ...

and

Nova Scotia Nova Scotia ( ; ; ) is one of the thirteen provinces and territories of Canada. It is one of the three Maritime provinces and one of the four Atlantic provinces. Nova Scotia is Latin for "New Scotland". Most of the population are native Eng ...

. In Nova Scotia, over 16,000 residences lost power at the height of the storm.

References

External links

Advisory archive for Tropical Storm Danny
from the Canadian Hurricane Centre {{DEFAULTSORT:Danny (2009) 2009 Atlantic hurricane season Atlantic tropical storms Hurricanes in Canada Hurricanes in North Carolina

Danny Danny is a masculine given name. It is related to the male name Daniel. It may refer to: People *Danny Altmann, British immunologist *Danny Antonucci, Canadian animator, director, producer, and writer *Danny Baker (born 1957), English journalis ...

Meteorological history

Impact

See also

References

External links