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Unnamed Tropical Storm (2006)
Encyclopedia
The 2006 Nova Scotia tropical storm was a short-lived tropical cyclone
that was unnamed operationally during the season but was recognized during post-season analysis and designated AL022006. The second tropical storm of the 2006 Atlantic hurricane season
, the system developed as an extratropical cyclone
to the southeast of Nantucket, Massachusetts
, on July 16 from a dissipating cold front
. It tracked northeastward over warm water temperatures, and on July 17 transitioned into a tropical storm after an area of convection developed over the center. The storm quickly reached peak winds of 50 mph (85 km/h) before encountering cooler waters and weakening. On July 18, it degenerated into a non-convective remnant low, and after crossing Newfoundland it dissipated on July 19. Impact in Canada
was minimal, and no deaths were reported.
moved off the East Coast of the United States
late on July 13 and subsequently stalled over the western Atlantic Ocean
. The front decayed and dissipated, leaving behind two areas of low pressure
. The southern area was centered about 200 miles (320 km) south of Cape Hatteras, North Carolina and ultimately became Tropical Storm Beryl
, while the northern area was centered about 290 miles (470 km) south-southeast of Cape Cod, Massachusetts. The northern area developed into an extratropical low
on July 16 after an upper-level trough
approached it from the west. Moving northeastward over warm water temperatures of 80–82° F (27–28° C), the trough weakened, and late on July 16 the system separated itself from the dissipating cold front. Shortly thereafter, a large burst of convection developed near the center, and it is estimated the system transitioned into a tropical depression early on July 17 while located about 240 miles (390 km) southeast of Nantucket, Massachusetts
.
Accelerating northeastward, the depression encountered favorable conditions for development, and intensified into a tropical storm six hours after becoming a tropical cyclone. A large curved band of convection formed in the northern portion of the storm, with other banding features becoming more prominent. It continued to strengthen, and late on July 17 the storm attained peak winds of 50 mph (85 km/h) while located about 245 miles (395 km) south of Halifax, Nova Scotia. Shortly thereafter, the storm encountered much cooler water temperatures after leaving the Gulf Stream
. The storm quickly weakened as the convection rapidly diminished, and on July 18 it degenerated into a non-convective remnant low. The remnants crossed Newfoundland before turning to the east-northeast, and on July 19 the system dissipated.
Operationally, the storm was classified as a non-tropical gale. However, a post-season analysis of the storm provided enough evidence of tropical characteristics
to warrant classifying it as an unnamed tropical storm. Observations analyzed the storm as having a symmetric warm-core, whereas in real time it was considered subtropical
. Additionally, the storm was first assessed as a frontal low in real-time, though subsequent analysis indicated no frontal features and no cold air entrainment around the time of its peak intensity.
, a Canadian buoy
recorded maximum sustained winds of 36 mph (56 km/h) with gusts to 44 mph (70 km/h). The same buoy recorded a pressure of 1001.2 mbar
(29.57 inHg). The storm greatly weakened prior to moving across Newfoundland
, and as a result impact was minimal. No official forecasts were issued for the system; however the Atlantic Storm Prediction Centre issued marine gale warnings for the storm.
As part of its routine post-season review, the National Hurricane Center
occasionally identifies a previously undesignated tropical or subtropical cyclone based on new data or meteorological interpretation. The reanalysis of 2006 resulted in its re-classification as an unnamed tropical storm on December 15, 2006; had it been classified operationally, it would have been named Tropical Storm Beryl.
Tropical cyclone
A tropical cyclone is a storm system characterized by a large low-pressure center and numerous thunderstorms that produce strong winds and heavy rain. Tropical cyclones strengthen when water evaporated from the ocean is released as the saturated air rises, resulting in condensation of water vapor...
that was unnamed operationally during the season but was recognized during post-season analysis and designated AL022006. The second tropical storm of the 2006 Atlantic hurricane season
2006 Atlantic hurricane season
The 2006 Atlantic hurricane season was significantly less active than the record previous season. It marked the first since 2001 in which no hurricanes made landfall in the United States, and was the first since 1994 that no tropical cyclones formed during October. Following the intense activity of...
, the system developed as an extratropical cyclone
Extratropical cyclone
Extratropical cyclones, sometimes called mid-latitude cyclones or wave cyclones, are a group of cyclones defined as synoptic scale low pressure weather systems that occur in the middle latitudes of the Earth having neither tropical nor polar characteristics, and are connected with fronts and...
to the southeast of Nantucket, Massachusetts
Nantucket, Massachusetts
Nantucket is an island south of Cape Cod, Massachusetts, in the United States. Together with the small islands of Tuckernuck and Muskeget, it constitutes the town of Nantucket, Massachusetts, and the coterminous Nantucket County, which are consolidated. Part of the town is designated the Nantucket...
, on July 16 from a dissipating cold front
Cold front
A cold front is defined as the leading edge of a cooler mass of air, replacing a warmer mass of air.-Development of cold front:The cooler and denser air wedges under the less-dense warmer air, lifting it...
. It tracked northeastward over warm water temperatures, and on July 17 transitioned into a tropical storm after an area of convection developed over the center. The storm quickly reached peak winds of 50 mph (85 km/h) before encountering cooler waters and weakening. On July 18, it degenerated into a non-convective remnant low, and after crossing Newfoundland it dissipated on July 19. Impact in Canada
Canada
Canada is a North American country consisting of ten provinces and three territories. Located in the northern part of the continent, it extends from the Atlantic Ocean in the east to the Pacific Ocean in the west, and northward into the Arctic Ocean...
was minimal, and no deaths were reported.
Meteorological history
A cold frontCold front
A cold front is defined as the leading edge of a cooler mass of air, replacing a warmer mass of air.-Development of cold front:The cooler and denser air wedges under the less-dense warmer air, lifting it...
moved off the East Coast of the United States
East Coast of the United States
The East Coast of the United States, also known as the Eastern Seaboard, refers to the easternmost coastal states in the United States, which touch the Atlantic Ocean and stretch up to Canada. The term includes the U.S...
late on July 13 and subsequently stalled over the western Atlantic Ocean
Atlantic Ocean
The Atlantic Ocean is the second-largest of the world's oceanic divisions. With a total area of about , it covers approximately 20% of the Earth's surface and about 26% of its water surface area...
. The front decayed and dissipated, leaving behind two areas of low pressure
Low pressure area
A low-pressure area, or "low", is a region where the atmospheric pressure at sea level is below that of surrounding locations. Low-pressure systems form under areas of wind divergence which occur in upper levels of the troposphere. The formation process of a low-pressure area is known as...
. The southern area was centered about 200 miles (320 km) south of Cape Hatteras, North Carolina and ultimately became Tropical Storm Beryl
Tropical Storm Beryl (2006)
Tropical Storm Beryl was the third tropical storm of the 2006 Atlantic hurricane season. Developing from a tropical disturbance on July 18, it tracked generally northward, and strengthened to attain peak winds of 60 mph under generally favorable conditions. After turning to the northeast,...
, while the northern area was centered about 290 miles (470 km) south-southeast of Cape Cod, Massachusetts. The northern area developed into an extratropical low
Extratropical cyclone
Extratropical cyclones, sometimes called mid-latitude cyclones or wave cyclones, are a group of cyclones defined as synoptic scale low pressure weather systems that occur in the middle latitudes of the Earth having neither tropical nor polar characteristics, and are connected with fronts and...
on July 16 after an upper-level trough
Trough (meteorology)
A trough is an elongated region of relatively low atmospheric pressure, often associated with fronts.Unlike fronts, there is not a universal symbol for a trough on a weather chart. The weather charts in some countries or regions mark troughs by a line. In the United States, a trough may be marked...
approached it from the west. Moving northeastward over warm water temperatures of 80–82° F (27–28° C), the trough weakened, and late on July 16 the system separated itself from the dissipating cold front. Shortly thereafter, a large burst of convection developed near the center, and it is estimated the system transitioned into a tropical depression early on July 17 while located about 240 miles (390 km) southeast of Nantucket, Massachusetts
Nantucket, Massachusetts
Nantucket is an island south of Cape Cod, Massachusetts, in the United States. Together with the small islands of Tuckernuck and Muskeget, it constitutes the town of Nantucket, Massachusetts, and the coterminous Nantucket County, which are consolidated. Part of the town is designated the Nantucket...
.
Accelerating northeastward, the depression encountered favorable conditions for development, and intensified into a tropical storm six hours after becoming a tropical cyclone. A large curved band of convection formed in the northern portion of the storm, with other banding features becoming more prominent. It continued to strengthen, and late on July 17 the storm attained peak winds of 50 mph (85 km/h) while located about 245 miles (395 km) south of Halifax, Nova Scotia. Shortly thereafter, the storm encountered much cooler water temperatures after leaving the Gulf Stream
Gulf Stream
The Gulf Stream, together with its northern extension towards Europe, the North Atlantic Drift, is a powerful, warm, and swift Atlantic ocean current that originates at the tip of Florida, and follows the eastern coastlines of the United States and Newfoundland before crossing the Atlantic Ocean...
. The storm quickly weakened as the convection rapidly diminished, and on July 18 it degenerated into a non-convective remnant low. The remnants crossed Newfoundland before turning to the east-northeast, and on July 19 the system dissipated.
Operationally, the storm was classified as a non-tropical gale. However, a post-season analysis of the storm provided enough evidence of tropical characteristics
Tropical cyclogenesis
Tropical cyclogenesis is the term that describes the development and strengthening of a tropical cyclone in the atmosphere. The mechanisms through which tropical cyclogenesis occurs are distinctly different from those through which mid-latitude cyclogenesis occurs...
to warrant classifying it as an unnamed tropical storm. Observations analyzed the storm as having a symmetric warm-core, whereas in real time it was considered subtropical
Subtropical cyclone
A subtropical cyclone is a weather system that has some characteristics of a tropical and an extratropical cyclone. As early as the 1950s, meteorologists were unclear whether they should be characterized as tropical or extratropical cyclones. They were officially recognized by the National...
. Additionally, the storm was first assessed as a frontal low in real-time, though subsequent analysis indicated no frontal features and no cold air entrainment around the time of its peak intensity.
Impact and naming
Upon entering the area of responsibility of the Canadian Hurricane CentreCanadian Hurricane Centre
The Canadian Hurricane Centre is a division of the Meteorological Service of Canada, an agency of Canada's Department of the Environment, which exists to advise Canadians on the threat of tropical cyclones such as hurricanes and tropical storms...
, a Canadian buoy
Buoy
A buoy is a floating device that can have many different purposes. It can be anchored or allowed to drift. The word, of Old French or Middle Dutch origin, is now most commonly in UK English, although some orthoepists have traditionally prescribed the pronunciation...
recorded maximum sustained winds of 36 mph (56 km/h) with gusts to 44 mph (70 km/h). The same buoy recorded a pressure of 1001.2 mbar
Bar (unit)
The bar is a unit of pressure equal to 100 kilopascals, and roughly equal to the atmospheric pressure on Earth at sea level. Other units derived from the bar are the megabar , kilobar , decibar , centibar , and millibar...
(29.57 inHg). The storm greatly weakened prior to moving across Newfoundland
Newfoundland and Labrador
Newfoundland and Labrador is the easternmost province of Canada. Situated in the country's Atlantic region, it incorporates the island of Newfoundland and mainland Labrador with a combined area of . As of April 2011, the province's estimated population is 508,400...
, and as a result impact was minimal. No official forecasts were issued for the system; however the Atlantic Storm Prediction Centre issued marine gale warnings for the storm.
As part of its routine post-season review, the National Hurricane Center
National Hurricane Center
The National Hurricane Center , located at Florida International University in Miami, Florida, is the division of the National Weather Service responsible for tracking and predicting weather systems within the tropics between the Prime Meridian and the 140th meridian west poleward to the 30th...
occasionally identifies a previously undesignated tropical or subtropical cyclone based on new data or meteorological interpretation. The reanalysis of 2006 resulted in its re-classification as an unnamed tropical storm on December 15, 2006; had it been classified operationally, it would have been named Tropical Storm Beryl.
See also
- List of storms in the 2006 Atlantic hurricane season
- List of Canada hurricanes
- Timeline of the 2006 Atlantic hurricane seasonTimeline of the 2006 Atlantic hurricane seasonThe 2006 Atlantic hurricane season was the first since 2001 in which no hurricanes made landfall in the United States, and the first since 1994 that no tropical cyclones formed during October. This timeline documents all the storm formations, strengthening, weakening, landfalls, extratropical...