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Tropical Storm Cristobal (2002)

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Tropical Storm Cristobal
Tropical storm (SSHWS/NWS)
Tropical Storm Cristobal off the Southeastern U.S. on August 7
FormedAugust 5, 2002
DissipatedAugust 13, 2002
(Extratropical after August 8, 2002)
Highest winds1-minute sustained: 50 mph (85 km/h)
Lowest pressure999 mbar (hPa); 29.5 inHg
Fatalities3 indirect
DamageMinimal
Areas affectedBermuda, New York
Part of the 2002 Atlantic hurricane season

Tropical Storm Cristobal was a relatively weak tropical cyclone that meandered in the western Atlantic Ocean prior to being absorbed into a frontal zone. The third named storm of the 2002 Atlantic hurricane season, Cristobal developed on August 5 near the coast of South Carolina from the same trough that spawned Tropical Storm Bertha. The storm tracked slowly southeastward in the early portion of its duration, and initially remained disorganized. Cristobal attained peak winds of 50 mph (85 km/h), and lost the characteristics of a tropical cyclone on August 8. The remnants brought moderate precipitation to Bermuda, and in combination with a high pressure system the storm caused three drownings on Long Island from rip currents.

Meteorological history

Map plotting the storm's track and intensity, according to the Saffir–Simpson scale
Map key
Saffir–Simpson scale
  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 trough extended from the northern Gulf of Mexico to the western Atlantic Ocean in early August. The trough remained nearly stationary, spawning Tropical Storm Bertha in the Gulf of Mexico and a tropical disturbance off the coast of South Carolina.[1] The weak low pressure area off South Carolina drifted southward, with its associated deep convection increasing in organization on August 4.[2] By 1800 UTC on August 5, the system had acquired sufficient organization to be classified as Tropical Depression Three, while located about 175 miles (280 km/h) east-southeast of Charleston, South Carolina.[1]

Upon becoming a tropical depression, the cyclone maintained outer rainbands and fair outflow. It tracked southeastward around the northeastern periphery of an anticyclone over Florida.[3] By August 6, the convection had diminished as outflow became restricted due to northeasterly wind shear;[4] with a relatively dry environment, most of the convection was confined to the southern semicircle of the depression. Despite the circulation becoming elongated in the southwesterly flow of a southward moving cold front, a Hurricane Hunters flight late on August 6 reported that the depression intensified into Tropical Storm Cristobal about 315 miles (505 km) east of Jacksonville, Florida.[1]

Tropical Storm Cristobal initially continued tracking southeastward, with its circulation reforming closer to the thunderstorms during each increase in convection.[5] On August 7 the storm turned eastward, due to the influence of a large approaching mid to upper-level frontal zone. As the convection organized further, Cristobal intensified somewhat and attained peak winds of 50 mph (85 km/h). On August 8, increased dry air weakened the convection and caused Cristobal to accelerate east-northeastward. The low-level circulation interacted with the approaching frontal zone, and by 0000 UTC on August 9 Tropical Storm Cristobal was absorbed by the cold front about 350 miles (560 km) southeast of Cape Hatteras, North Carolina.[1] The remnants continued northeastward, passing near Newfoundland on August 10 before weakening near Greenland on August 14.[6]

Impact

As a tropical cyclone, Cristobal had minimal effects on land.[1] However, its remnants brought unsettled conditions to Bermuda, including a 45 mph (72 km/h) wind gust at the Bermuda International Airport. The combination of moisture from Cristobal and cold front into which it was absorbed produced 2.78 inches (71 mm) of rain there in a 24‑hour period.[7] An annual powerboat race circumnavigating Bermuda had to be postponed by a week because of the adverse weather.[8]

Although Cristobal remained offshore during its evolution, rough seas and rip currents were felt along portions of the U.S. East Coast. On August 9, lifeguards in Volusia County, Florida, rescued about 25 swimmers caught in rip currents.[9] Offshore winds from the storm were credited with ending a widespread outbreak of jellyfish stings affecting bathers along the northern Atlantic coast of Florida. Some 1,000 stings had been reported.[10] Two ships recorded tropical storm force winds in association with the storm; one of them, a vessel with the call sign WUQL, reported sustained winds of 47 mph (76 km/h) from the west-southwest on August 7, while located about 160 mi (260 km) northeast of Great Abaco.[1]

Later, the extratropical remnants of Cristobal continued to interact with a high pressure system over the Mid-Atlantic states to generate dangerous swimming conditions further north. Along the south shore of Long Island, New York, significant wave heights reached 4 feet (1.2 m), and rip currents resulted in three drowning deaths on August 10: one in Montauk; one just east of Moriches Inlet; and one off Rockaway Beach.[11] In the latter case, the victim had become exhausted after swimming out to save his son-in-law, an inexperienced swimmer, from the rip current.[12]

See also

References

  1. ^ a b c d e f James Franklin (2002). "Tropical Storm Cristobal Tropical Cyclone Report" (PDF). National Hurricane Center. Retrieved 2015-05-26.
  2. ^ Stacy Stewart (August 4, 2002). "Tropical Weather Outlook: 5:30 PM August 4, 2002". National Hurricane Center. Retrieved February 2, 2020.
  3. ^ Jack Beven (2002). "Tropical Depression Three Discussion One". National Hurricane Center. Retrieved 2008-01-08.
  4. ^ Stacy Stewart (2002). "Tropical Depression Three Discussion Two". National Hurricane Center. Retrieved 2008-01-08.
  5. ^ Stacy Stewart (2002). "Tropical Storm Cristobal Discussion Seven". National Hurricane Center. Retrieved 2008-01-08.
  6. ^ Gary Padgett (2002). "Worldwide Tropical Summary for August 2002". Retrieved 2008-01-08.
  7. ^ Bermuda Weather Service (2002). "Bermuda Weather for August 2002". Archived from the original on 2012-02-08. Retrieved 2008-01-08.
  8. ^ "Rough weather foils Around the Island racers". The Royal Gazette. August 12, 2002. Retrieved February 2, 2020.
  9. ^ Alicia A. Caldwell (August 10, 2002). "This weekend, Atlantic coastline harbors a hazard". The Orlando Sentinel. Retrieved February 2, 2020. Open access icon
  10. ^ The Associated Press (August 10, 2002). "Winds sweep jellyfish off of northeast Fla. coast". The Palm Beach Post. Retrieved February 2, 2020. Open access icon
  11. ^ National Climatic Data Center (2002). "Event Report for New York". Archived from the original on 2011-05-20. Retrieved 2008-01-08.
  12. ^ Tamer El-Ghobashy (August 12, 2002). "He saves son-in-law, but drowns in surf". The New York Daily News. Retrieved February 2, 2020. Open access icon
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