Winter 1985 cold wave

The 1985 North America cold wave was a meteorological event which occurred in January 1985 as a result of the shifting of the polar vortex farther south than is normally seen. Blocked from its normal movement, polar air from the north pushed into nearly every section of the central and eastern half of the United States and Canada, shattering record low temperature records in a number of areas. This was preceded by unusually warm weather in the eastern U.S. in December 1984, suggesting that there was a build-up of cold air that was suddenly released from the Arctic, a meteorological event known as a mobile polar high. Mount Mitchell, in North Carolina recorded an all time record low of .

Meteorological synopsis

From Sunday, January 20, 1985, until Tuesday, January 22, 1985, the polar vortex, coupled with a large ridge of high pressure, moved polar air into the United States as far south as Arizona, Texas, and northern Florida. Unlike with cold-air systems, a pattern of self-modification did not immediately occur, and seasonable temperatures were absent for a number of days, a rarity in forecasting.

The Arctic air mass started moving into the United States on the evening of January 19 and into the morning of January 20, 1985. In Chicago, Illinois, a record low of combined with winds, to produce a wind chill of . St. Louis, Missouri saw a low of , and Pittsburgh, Pennsylvania had a low of , the coldest morning since 1899.NWA Pittsburgh statistics
/ref> In Cincinnati, Ohio, the morning temperature of tied for the fourth-lowest minimum temperature in the city's history, outdone by a cold mass the year before and a blizzard in 1977.RECORDS FOR CINCINNATI
/ref> Cleveland, Ohio fell to , which was at the time a record low.Cleveland Normals and Records for January
/ref> Memphis, Tennessee recorded a low of , setting a record low for that day. Virginia's official record low temperature of was also set on this day in Pembroke, Virginia.

As the cold air mass moved southeastward, it modified only slightly, resulting in frigid air for most of the East Coast of the United States starting on the morning of January 21, 1985. New York City's Central Park recorded a low of , breaking that date's record.CENTRAL PARK NEW YORK CITY RECORDS 1869-2008
/ref> Washington National Airport recorded a low of and Washington Dulles Airport a low of on the morning of January 21.DAILY NORMALS AND RECORDS FOR THE MONTH OF JANUARY FOR WASHINGTON DC
/ref> Farther south, Roanoke, Virginia, set a record low of . Nashville, Tennessee dropped to , and Knoxville, Tennessee recorded a record low of . All-time low temperature records were also set well into interior sections of the deep South, such as in Charlotte, North Carolina, where temperatures were recorded as low as ; Macon, Georgia, with a record low of ; and Jacksonville, Florida with a record low of . Gainesville, Florida, with a low temperature of was its coldest temperature since the Great Blizzard of 1899 (when it had reached a low of ). Atlanta, Georgia saw a low of , setting a record for the month of January as well as for the 20th century, and was only one degree shy of its all-time record (since 1878) set in February 1899.Average Weather for Atlanta, GA
/ref> Miami, Florida, whose average low in late January is , recorded a record low of on January 21, 1985, and on January 22, 1985. The high temperature at Miami Beach on January 22 was only , which was below normal.

Impact and aftermath

The cold wave of January 1985 resulted in at least 126 human fatalities, the deaths of many wild and domesticated animals, massive crop losses, and widespread infrastructure damage. Approximately 90% of the citrus crops in Florida were destroyed in what the state called the "Freeze of the Century," resulting in Florida's citrus industry suffering $1.2 billion in losses ($2.68 billion in 2016 dollars).

The second presidential inauguration of U.S. President Ronald Reagan was held in the United States Capitol Rotunda instead of outside, due to the cold weather, and the inaugural parade was cancelled. Since Inauguration Day fell on a Sunday, Ronald Reagan took a private oath on January 20, 1985, and the semi-public oath on January 21, 1985.

References

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1985 natural disasters in the United States
20th-century cold waves
1985 meteorology
1985 natural disasters
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