1994 North American Cold Wave
MERRA-2 Reanalysis over the Upper Midwest showing 2-Meter Temperatures and wind vectors on January 18, 1994, at 1 PM EST. Temperatures are in Fahrenheit.
1994 North American Cold Wave
Type Cold wave
Formed January 1994
Dissipated January 1994
Lowest temperature -52 °F (-46.7 °C) in Amasa, MI on January 19
Areas affected United States and Canada

The 1994 North American cold wave occurred over the midwestern United States, eastern United States, and southern Canada during January 1994. Two notable cold air events occurred from January 18-19 and from January 21-22. There were 67 minimum temperature records set on January 19.[1]Indiana and Kentucky both set state records on January 19.[2] The United States experienced its coldest temperature month since February 1934, although much of the West experienced mild temperatures. Washington and Idaho experienced the second-warmest January recorded in the previous 100 years.[1]

During the same period, the western United States experienced one of its most damaging earthquakes ever, and the eastern United States experienced a major snowfall that significantly delayed traffic.[3]

Over 100 deaths occurred in the United States as a result of the cold wave.

Meteorological synopsis

500 mb height contours at 7 AM EST on January 18, 1994, showing an upper-level trough.

Cold air outbreaks are characterized by strong upper-level troughs in the atmosphere, with ridges usually located up and downstream.[4] On January 17, the 500 millibar (mb) height contours showed the low-pressure center situated near the border of Ontario and Manitoba, just north of Minnesota, with the trough axis stretching down into the Upper Midwest. The 500 mb height contours on January 18, 1994, showed the strong trough over the Great Lakes region extending southward that brought cold air down from the North Pole. MERRA-2 reanalysis detailed the cold air funneling into the Upper Midwest from Canada on January 18, with strong winds out of the northwest. The surface analysis map on January 18 showed a low-level ridge over the Upper Midwest and surface winds blowing out of the northwest. The surface anticyclones on January 18 and 21 both exceeded 1040 mb and moved to the southeast, bringing cold air to much of the eastern half of the United States. By January 19, the upper levels showed a retreat of the low-pressure center, however, shortwave troughs were still located near the United States, and surface temperature effects with the strong anticyclone were felt for days to come.[5]

While the cold air was the dominant story, snow was still associated with this cold weather outbreak. From January 17-18, a snowstorm affected areas from the Ozarks to New England. Ice affected much of the Mid-Atlantic region. A new single-storm record was broken in Louisville, Kentucky with 16 inches of snowfall recorded, while accumulations of sleet and freezing rain in New York City were in excess of an inch.[1]

Surface analysis map at 7 AM EST on January 18, 1994.

Temperature records

Maximum temperatures from 7 AM to 7 PM EST on January 18, 1994, with minimum temperatures from 7 PM to 7 AM EST on January 19, 1994.

Washington National Airport, later renamed to Reagan National Airport, had a new record-low max. temperature for the 20th century of 8 °F (-13.3 °C).[6][7]

On January 19, the temperature in New Whiteland, Indiana dropped to -36 °F (-37.8 °C), the record-lowest temperature in Indiana.[8] The minimum record temperature in Kentucky was -37 °F (-38.3 °C) in Shelbyville on January 19, 1994.[9]

The lowest temperature seen in Sussex County, New Jersey was -26 °F (-32.2 °C) on January 21, 1994.[10]:p.3

Pittsburgh, Pennsylvania saw its record-low temperature of -22 °F (-30 °C) on January 19, 1994.[11]Columbus, Ohio set an all-time record-low temperature of -22 °F (-30 °C) on January 19 as well. However, the arctic blast lasted for three days from January 18 to 20.[12]

Akron, Ohio set a record-low temperature at -25 °F (-32 °C).[1]

On January 6-7, 1994, Lake County, Minnesota set records for the largest snow in one day as well as the most snow in one storm.[13]

Maine had its coldest month since February 1934[14] and its coldest January since 1920,[15] while Vermont had its coldest winter since 1958-1959[16] and the adjacent states of New Hampshire and Maine their coldest since 1976-1977 or 1970-1971.

Canada

January was also a month of extremes in Canada. Temperatures in the Yukon got close to -50 °C (-58 °F). In Yellowknife, the temperature did not go higher than -40 °C (-40 °F) for many days. In Windsor, Ontario, the coldest temperature since 1885 was recorded on January 19 of -29 °C (-20 °F). The cold air was also accompanied by large snowfalls, with 50 centimeters (20 inches) falling on the western side of Lake Ontario. Just like the mild pattern in the western United States, southern British Columbia got above 10 °C (50 °F) several times during the month of January. Rapid melting and freezing near the end of the January closed Toronto Pearson International Airport on January 30 for the first time in 60 years. Water shortages were also common in Goose Bay due to the extreme temperatures.[1]

Minneapolis-St. Paul

Maximum and Minimum Daily Temperatures at Minneapolis-St. Paul International Airport during the cold wave.

Minneapolis-Saint Paul is one of the areas that felt major impacts from the cold wave. From 3 PM CST on January 13 to 1 PM CST on January 19, the temperature recorded at Minneapolis-Saint Paul International Airport stayed at or below zero, marking 142 continuous hours. This was the sixth-longest stretch on record from 1873-2014.[17] Governor Arne Carlson closed all public schools in Minnesota on January 18, with wind chills of -48 °F (-44 °C) and morning air temperatures of -26 °F (-32 °C).[18]

Chicago

Temperatures in Chicago, Illinois reached -21 °F (-29.4 °C)[3] with wind chills of -55 °F (-48.3 °C),[19] the coldest day of the 1990s in Chicago.[20] Almost all primary and secondary schools in Chicago were closed that day. Richard Daley, mayor of Chicago advised residents not to go outside if they do not have to. Nearly all schools in the area were closed and four people in Cook County, Illinois died from hypothermia. Hundreds of drivers per hour complained to the AAA-Chicago Motor Club about dead automobile batteries, fuel injectors being too cold and other vehicle issues and United Airlines canceled almost half of its flights. Tens of thousands of individuals complained about a lack of power due to severed electricity lines while water companies shut off water to homes as a result of pipe explosions.[19] Thousands of apartment renters complained to Cook County about insufficient heat.

References

  1. ^ a b c d e Ludlum, David M. (1994-05-01). "January 1994". Weatherwise. 47 (2): 44-49. ISSN 0043-1672. doi:10.1080/00431672.1994.9925321. 
  2. ^ Schmidlin, Thomas W. (1997-01-01). "Recent State Minimum Temperature Records in the Midwest". Bulletin of the American Meteorological Society. 78 (1): 35-40. ISSN 0003-0007. doi:10.1175/1520-0477(1997)0782.0.CO;2. 
  3. ^ a b "Chicagoans Endure New Record Cold - Chicago Tribune". Articles.chicagotribune.com. 1994-01-18. Retrieved . 
  4. ^ "Winter Weather Basics: Cold Air Outbreaks" (PDF). 
  5. ^ "U.S. Daily Weather Maps | NOAA Central Library". www.lib.noaa.gov. Retrieved . 
  6. ^ October 16, 2013 (2013-01-19). "Recalling the January 1994 Arctic Outbreak - The Frederick News-Post : Free State Weather". The Frederick News-Post. Retrieved . 
  7. ^ NOAA National Climate Data Center. "Daily Summaries Station Details: WASHINGTON REAGAN NATIONAL AIRPORT, VA US". Retrieved . 
  8. ^ "Indiana State Climate Office". Climate.agry.purdue.edu. Retrieved . 
  9. ^ "Winter Climatology". Crh.noaa.gov. Retrieved . 
  10. ^ U.S. Department of Agriculture Natural Resource Conservation Service. Soil Survey of Sussex County, New Jersey (Washington, DC: 2009).
  11. ^ "Brrrr! Remembering Pittsburgh's coldest day | Weather - WTAE Home". Wtae.com. 2013-01-19. Retrieved . 
  12. ^ "Records for Columbus". Archived from the original on December 21, 2014. Retrieved 2015. 
  13. ^ "Minnesota Snowfall and Snow Depth Extremes". National Climatic Data Center. December 3, 2007. Retrieved . 
  14. ^ "Climate at a Glance | National Centers for Environmental Information (NCEI)". Ncdc.noaa.gov. 2015-03-06. Retrieved . 
  15. ^ "Climate at a Glance | National Centers for Environmental Information (NCEI)". Ncdc.noaa.gov. 2015-03-06. Retrieved . 
  16. ^ "Climate at a Glance | National Centers for Environmental Information (NCEI)". Ncdc.noaa.gov. 2015-03-06. Retrieved . 
  17. ^ "Extended Period of Zero or Below in the Twin Cities 1873-2014". www.climate.umn.edu. Retrieved . 
  18. ^ "Historic Wind Chill Temperatures in Minnesota". climate.umn.edu. Retrieved . 
  19. ^ a b "Cold, Colder And Maybe The Coldest - Chicago Tribune". Articles.chicagotribune.com. 1994-01-18. Retrieved . 
  20. ^ "Coldest Days Ever In Chicago « CBS Chicago". Chicago.cbslocal.com. Retrieved . 

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