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December 17–22, 2012 North American blizzard

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December 17–22, 2012 North American blizzard
Category 2 "Significant" (RSI/NOAA: 3.349)
TypeExtratropical cyclone
Winter storm
Blizzard
Nor'easter
FormedDecember 13, 2012[1]
DissipatedDecember 29, 2012[2]
Highest gust50 mph[3]
Lowest pressure971 millibars (28.7 inHg)[4]
Maximum snowfall
or ice accretion		15.2 inches (0.39 m) in Madison, Wisconsin (preliminary)[5][6]
FatalitiesAt least 6[7]
DamageUnknown
Areas affectedAlaska
Contiguous United States
Western Canada
Eastern Canada
Bermuda
Southern Greenland
Iceland

The December 17–22, 2012 North American blizzard[8] [9][10] was a massive winter storm that affected the Midwestern and Eastern United States.[5] Forming on December 17, the winter storm moved across the midwest, forcing schools to close throughout the region.[3] Numerous warnings and advisories have been posted by the National Weather Service for many states, including Iowa, Nebraska, Illinois, and Wisconsin.[3][11] Both O'Hare International Airport and Midway International Airport in Chicago, Illinois canceled most departures and arrivals.[12] According to flight tracking website FlightStats.com, more than 1,000 flights were canceled across the region.[13] More than 130,000 customers are without power across the west and midwest.[5]

In addition to snow, strong thunderstorms and possible tornadoes went across the Southern United States.[14] A multiple-car pileup on Interstate 35 in Fort Dodge, Iowa killed two people, according to the Iowa State Patrol.[6] American Airlines, American Eagle Airlines, and Southwest Airlines collectively canceled a total of 573 flights in the midwest.[15] Greyhound Lines also canceled service in Chicago, Minneapolis, and Indianapolis.[15]

The storm moved east towards the Northeast and New England. Winter storm and blizzard warnings were issues from north New York to western Pennsylvania.[6]

Meteorological synopsis

Snowfall over the Midwest on December 21

On December 17, an upper-level shortwave and associated trough made landfall along the coast of the Pacific Northwest. The system initially moved towards the southeast, strengthening over the Rocky Mountains. This led to the development and formation of a surface low over eastern Colorado early on December 19. The low began to curve towards the northeast, and its barometric pressure began to deepen. The low attained its lowest pressure at 1800 UTC on December 20 over northern Illinois. However, the system became occluded, and as such moved quickly to the northeast, where it weakened and subsequently dissipated over southern Ontario late on December 21. Another low pressure area formed in the vicinity of the previous low over the East Coast of the United States, which quickly moved north across the coast, bringing heavy snowfalls to the region. The low later exited the continental United States on December 22.[16] During the next several days, the winter storm drifted northeastward, and eventually to the south of Greenland, before finally being absorbed by another more powerful extratropical cyclone just south of Iceland, on December 29.[2]

Impact

Southern United States

Arkansas

File:Grant Tornado Damage Dec 20 2012.jpg
Damage caused by an EF1 tornado in Grant County, Arkansas

A dry line associated with the system moved east across eastern Oklahoma and northwestern Arkansas, helping to trigger thunderstorm and shower development across Arkansas.[17] The thunderstorms produced wind gusts as high as 80 mph (130 km/h), downing trees and power lines. Power outages affected 40,000 people throughout the state as a result of the storms. South of Delight, Arkansas, at least three barns were displaced due to the strong winds. Hail measuring up to 1.25 in (3.2 cm) was recorded in Logan County, Arkansas. In addition, dust from drought stricken areas was carried aloft into the storm system, falling to the ground and thus coating cars in mud.[18]

One of these thunderstorms also spawned a short lived tornado near Lavaca, Arkansas on December 19. The tornado was rated as an EF1 on the Enhanced Fujita scale,[17] after damaging various trees, homes, and blowing roofs off of structures.[19] A second EF1 tornado was reported 2 mi (3.2 km) west of Sheridan, Arkansas the following day, destroying a mobile home.[20]

Alabama

Strong storms began to develop and organize ahead of a cold front produced by the winter storm in the early hours of December 20.[21] One of these storms developed off the Louisiana coast, before strengthening and moving ashore in Alabama. The storm developed strong rotation in its updraft and a mesocyclone formed. As a result, the storm spawned a tornado, later rated as an EF1, that moved across areas of northwest Mobile, Alabama.[22] The tornado damaged various homes and businesses in the area.[21] Other storms that formed across Alabama caused power outages to 18,000 people, of which 8,600 people were in Mobile.[23]

See also

References

  1. ^ http://www.wpc.ncep.noaa.gov/archives/web_pages/sfc/sfc_archive_maps.php?arcdate=12/13/2012&selmap=2012121321&maptype=satsfcnps
  2. ^ a b http://www.met.fu-berlin.de/de/wetter/maps/Analyse_20121229.gif
  3. ^ a b c Pearson, Michael (20 December 2012). "Blizzard blasts upper Midwest". CNN. Retrieved 21 December 2012.
  4. ^ http://www.wpc.ncep.noaa.gov/archives/web_pages/sfc/sfc_archive_maps.php?arcdate=12/24/2012&selmap=2012122415&maptype=satsfcnps
  5. ^ a b c Wisniewski, Mary (20 December 2012). "First major storm of winter pelts U.S. Midwest". Reuters. Retrieved 21 December 2012.
  6. ^ a b c CNN Wire Staff (21 December 2012). "Blizzard whacking the Midwest expected to lose strength". CNN. Retrieved 21 December 2012. {{cite news}}: |author= has generic name (help)
  7. ^ Llanos, Miguel (20 December 2012). "Holiday travel alert: Central US storm brings flight disruptions, deadly blizzard, and a tornado". NBC News. Retrieved 21 December 2012.
  8. ^ Chris Dolce; Jon Erdman; Nick Wiltgen (20 December 2012). "Draco Heading from Great Lakes to Northeast". Weather.com. Retrieved 21 December 2012.
  9. ^ "Winter Storm 2012: 'Draco' Blizzard Hits Midwest, Drivers Still Out On The Roads". The Inquisitr. 20 December 2012. Retrieved 21 December 2012.
  10. ^ Allison Ryan; Matthew Baker (20 December 2012). "Ready for Draco: Storm preparations underway". LaSalle News Tribune. Retrieved 21 December 2012.
  11. ^ Finney, Daniel (20 December 2012). "Blizzard warning extended to 9 p.m.; Travel hazardous 'if not impossible'". Des Moines Register. Retrieved 21 December 2012.
  12. ^ David Pitt; Margery Beck (20 December 2012). "Snow in Midwest Leaves Some Travelers Scrambling". Associated Press via ABC News. Retrieved 21 December 2012.
  13. ^ Mutzabaugh, Ben (20 December). "Storm snarls flights in Chicago, Midwest". USA Today. Retrieved 21 December 2012. {{cite news}}: Check date values in: |date= (help)
  14. ^ Memmott, Mark (20 December 2012). "Blizzard Warnings In Upper Midwest; Possible Tornado In Alabama". National Public Radio. Retrieved 21 December 2012.
  15. ^ a b "Midwest blizzard leads to some American Airlines, Southwest Airlines flight cancellations". Associated Press via The Dallas Morning News. 21 December 2012. Retrieved 21 December 2012.
  16. ^ Des Moines, Iowa Weather Forecast Office. "The December 19-20, 2012 Iowa Blizzard". National Weather Service. Retrieved 24 December 2012.
  17. ^ a b Tulsa, Oklahoma Weather Forecast Office. "19 Dec 2012 Tornado and Severe Weather Event". National Weather Service. Retrieved 24 December 2012.
  18. ^ Little Rock, Arkansas Weather Forecast Office. "Severe Storms/Very Windy on December 19-20, 2012". National Weather Service. Retrieved 24 December 2012.
  19. ^ Iowa Environmental Mesonet (December 20, 2012). "NWS Damage Survey For 12/19/12 Sebastian County Tornado Event". Tulsa, Oklahoma: National Weather Service. Retrieved 24 December 2012.
  20. ^ Little Rock, Arkansas Weather Forecast Office. "Severe Storms on December 20, 2012 (Damage Pictures)". National Weather Service. Retrieved 24 December 2012.
  21. ^ a b Mobile, Alabama Weather Forecast Office. "NWS Damage Survey Results For 20 December 2012 Tornado Across The Mobile Metropolitan Area". Public Information Statement. National Weather Service. Retrieved 27 December 2012.
  22. ^ Mobile, Alabama Weather Forecast Office (December 20, 2012). "20 Dec 2012 Mobile, AL and Avalon Point, FL Tornadoes". National Weather Service. Retrieved 27 December 2012.
  23. ^ "18,000 without power after storms rip Alabama". Mobile, Alabama. The Commercial Appeal. December 20, 2012. Retrieved 27 December 2012.
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