Hurricane Debby (1982)

Hurricane Debby was the strongest tropical cyclone of the 1982 Atlantic hurricane season, with winds peaking at . The fourth named storm, second hurricane, and the only major hurricane of the season, Debby developed near the north coast of Hispaniola from a westward moving tropical wave on September 13, 1982. Forming as a tropical depression, it headed northwestward, and eventually strengthened into Tropical Storm Debby the following day. Thereafter, Debby rapidly intensified into a hurricane early on September 15. The hurricane then curved northeastward and grazed Bermuda as a Category 2 hurricane on September 16. It continued to strengthen, and by September 18, Debby briefly peaked as a Category 4 hurricane on the Saffir–Simpson Hurricane Scale, with winds at and a minimum pressure of 950 mbar (hPa; 28.05 inHg).

After reaching peak intensity, Debby slowly weakened, and was between Category 2 and 1 when it passed south of Newfoundland early on September 19. Thereafter, the storm accelerated and was moving at roughly towards the east. Debby was rapidly approaching the British Isles on September 20, shortly before it transitioned into an extratropical cyclone. Overall, impact was minor in the Lesser Antilles, with only light to moderate rainfall in Dominican Republic, Puerto Rico, and the United States Virgin Islands. On Bermuda, high winds caused some power outages and knocked over trees, though damage on the island was minimal. In addition, Debby dropped rainfall and produced moderately strong winds on Newfoundland.

Meteorological history

A weather system moved off the coast of Africa on September 3. The disturbance was small and became unidentifiable within 24 hours of formation. Satellite imagery indicated that the disturbance may have acquired a circulation on September 7, but the circulation was gone by the next day. The remaining tropical wave moved into the Lesser Antilles on September 11 and a reconnaissance aircraft was deployed. The aircraft found circulation; however, by the next day, only a strong wave was detected. Atmospheric conditions became more favorable for development, yielding lower wind shear near Hispaniola for several days. The system moved into this area as the latest Reconnaissance aircraft was deployed, declaring it a tropical depression on September 13 near the Dominican Republic.

The next Reconnaissance aircraft that investigated the system discovered a minimal pressure of 1005 mbar (28.67 inHg) and winds of in the depression's center, prompting an upgrade to Tropical Storm Debby on the morning of September 14. Uncertainty arose as to whether Debby would interact with an approaching trough or enter the influence of a ridge over the southeastern United States. The storm was later picked up by the trough, moving away from land and moved to the north. Debby strengthened further, becoming a minimal hurricane late on September 14. The hurricane deepened further, reaching maximum winds of , a Category 2 storm. Debby approached Bermuda in this time, and on September 16, Debby passed west of the island and continued north.

Debby began to slow down to early on September 17 as another trough in the westerlies arrived and the system entered it. As the hurricane entered the trough, its forward speed picked up from . During this time, Debby reached Category 4 strength, reaching a peak intensity of and a minimal pressure of . Early on September 19, Debby passed just south of Cape Race, Newfoundland and started accelerating to the east at on the following day. Debby remained a tropical cyclone while crossing the North Atlantic Ocean and weakened to a tropical storm at 0600 UTC September 20. Debby was rapidly approaching the British Isles on September 20 shortly before it transitioned into an extratropical cyclone.

The remains of Debby maintained plenty of intensity over northern Europe, and on September 21 it struck northern parts of Finland (where it was named storm Mauri) as one of the most powerful windstorms in the country's recorded history. Winds over felled millions of cubic metres of forest, and a storm surge severely damaged the cities of Kemi and Tornio, claiming two lives.

Starting in the 1982 season (with Debby), the Hurricane Hunter Aircraft (also known as P-3s) began running a new mission for NOAA's Hurricane Research Division. The mission was to drop dropwindsondes that deployed very-low Omega frequency signals. These signals were to estimate the sonde's motion compared to the aircraft in certain areas in a storm.

Preparations and impact

Rainfalls from Debby in Puerto Rico ranged between around the northern end of the island to in the southern ridge of the island. Rains on the island peaked at in Penuelas. The U.S. Virgin Islands reported rain of about , while about of precipitation fell in Dominican Republic. The United States Navy removed its 700 personnel on Bermuda's Air Force Base, placing them in a gymnasium nearby. Thousands of tourists took last-minute flights out of Bermuda on September 16 as Debby drew near. Some of the airlines had pulled back the number of flights going in and out of the island. Eastern Airlines dropped from five flights to two, with them going to only New York City, Newark, New Jersey

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