Figure 1: Ice accumulation map for December 8th through 11th, 2007 Ice Storm. (analysis by Fred Glass, Senior Forecaster WFO St. Louis)
Figure 2: December 8th, 2007 6 PM (00z, 12/09/07) Surface Map. Note the cold air in place across the bi-state region as well as the quasi-stationary front across Arkansas and Tennessee (analysis by Scott Truett, Senior Forecaster WFO St. Louis).
Figure 3: December 8th, 2007 6 PM (00z, 12/09/07) 850MB/5,000 feet weather map. Warm and moist southwest flow at 850mb/5,000ft which is overrunning the cold air at the surface over Missouri and Illinois at this time (analysis by Scott Truett, Senior Forecaster WFO St. Louis).
Figure 4: December 8th, 2007 6 PM (00z, 12/09/07) Upper air observation from the Central Illinois Weather Service Forecast Office. Note the 'nose' of warm air between 1 and 3 kilometers (3,000-10,000ft) where the atmosphere warms up above 0 degrees celcius. This is a classic freezing rain upper air profile. Also, there are very steep mid-level lapse rates between 3 and 6 kilometers (10,000-18,000ft) indicating elevated convective instability. Indeed, thunderstorms with freezing rain and sleet formed after midnight Saturday night. These thunderstorms produced up to 2 inches of sleet across parts of central and northeast Missouri and west central Illinois.
Figure 5: December 8th, 2007 6 PM (00z, 12/09/07) 500MB/18,000 feet weather map. Steady southwest flow in the mid and upper levels of the atmosphere nearly parallels the surface front. This keeps the front nearly stationary through much of the weekend (analysis by Jon Carney, Forecaster WFO St. Louis).
Figure 6: Ice accumulation on power lines and trees in Jefferson City, MO.
Figure 7: Ice accumulation on trees in Pike county, Missouri.
Figure 8: Ice accumulation on trees in Pike county, Missouri.

NWS
St. Louis, Missouri


Ice Storm
December 8th through 11th, 2007

Impacts:

The hardest hit portions of the Bi-State area were the Jefferson City/Central MO area, and an area from Western Warren County, across Lincoln County to Pike County. Here are some estimated power outage numbers:

Immediate Jefferson City area: 20,000

Cole County: 30,000 total

Moniteau County: 10,000 (virtually all of California, MO was out for a period)

Callaway County: 8000 – 10,000

Lincoln County: 6000 – 7000

Pike: 4000 – 5000 (most of Louisiana, MO lost power)

Boone: The cities of Hartsburg, Ashland, and Holts Summit lost power.

Shelters were opened in Cole, Pike and Warren Counties (since closed).  From 50 – 60 people had been staying at the shelters in Cole County, and over 100 people were coming to the shelters at meal times for hot food.

2 fatalities were reported in Mid-Missouri.



Discussion:

On Saturday December 8th, a strong, cold high pressure system moved from Canada into the Great Plains.  This high pressure system brought some very cold air streaming into the Midwest and Great Plains regions.  At 2 PM on  December 8th, temperatures ranged from the mid 30s in southeast Missouri to the upper teens in northeast Missouri.  As this cold air was settling in across the Bi-State region, a low pressure system developed over the southern plains which drew copious amounts of Gulf moisture up and over the cold air which was locked in at the surface.  Sub-freezing temperatures across the northern 2/3s of the bi-state region combined with this overrunning warm and moist air provided the perfect setup for freezing rain.

Between Saturday evening and Tuesday (12/11) morning several waves of precipitation affected Missouri and Illinois, bringing up to an inch of freezing rain accumulation, as well as up to 2 inches of sleet in parts of central and northeast Missouri which fell after midnight on Sunday morning.

Ice Accumulation Map of December 8th through 12th, 2007
6 pm Surface Map, December 8th, 2007
6 pm 850MB Map, December 8th, 2007

00z ILX Sounding observation

6 pm 500MB Map, December 8th, 2007

Ice accumulation on power lines and trees in Jefferson City, MO

Ice accumulation in Pike County, Missouri

Ice accumulation in Pike County, Missouri


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