Figure 1: Total Snowfall Map For December 11-12th 2010.

NWS
St. Louis, Missouri

Winter Weather Event
December 11th-12th, 2010

A strong winter storm produced the season's first widespread measurable snowfall along with intense northwest winds and dangerous wind chill values. The winter storm's low pressure system track from the North-Central Plains into the Great Lakes driving a strong cold front through the Midwest. Strong and gusty northwest winds in the wake of the cold front ushered arctic air into the area and sent temperatures plummeting. Snow spread across Missouri and into Illinois on Saturday night and Sunday morning as the low pressure system continued to track through the Great Lakes. During and after the snow, the strong northwest winds gusting at times over 45 mph, resulted in blowing and drifting snow and made travel extremely hazardous. Snow exited southwest Illinois on Sunday evening with winds slowly diminishing and skies clearing. The combination of the arctic air and northwest winds produced bitterly cold wind chill values early on Monday morning with values ranging from -10 to -17 degrees.  Below is a map of observed snowfall from the event as well a listing of the highest wind gusts and lowest wind chills observed.

Highest Wind Gusts Observed
Belleville   (KBLV)   47 mph
Cahokia  (KCPS)   46 mph
Litchfield (K3LF)   46 mph
St. Louis (KSTL)   45 mph
Alton (KALN)   44 mph
Quincy (KUIN)   44 mph
Chesterfield (KSUS)  43 mph
Columbia (KCOU)   41 mph
Lowest Wind Chills Observed
Quincy       (KUIN)   -17
Columbia (KCOU)   -17
Alton (KALN)   -14
Chestefield (KSUS)   -13
Belleville (KBLV)   -13
Hannibal (KHAE)   -12
Cahokia (KCPS)   -12
Farmington (KFAM)   -12
Litchfield (K3LF)   -11
St. Louis (KSTL)   -11
Sullivan (KUVV)   -11

Snowfall Map

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