August 2010 Weather Summary

August 2010 Weather Summary

Hot and humid conditions persisted across central Illinois during the month of August 2010. Average monthly temperatures ranged from 2 to 4 degrees above normal in central Illinois. Several days during the month high temperatures reached or exceeded 90 degrees. In fact...the lowest high temperature in Springfield was only 81 degrees. Heat index values approached the 110 to 115 degree range south of interstate 70 on the 9th through the 13th. Further north, heat index values approached 105 degrees. Below is a list on number of days with a high temperature of 90 degrees or greater:

 

Location

Number of 90 Degree Days

Lawrenceville

20

Olney

16

Urbana

14

Normal

14

Paris

14

Lincoln

13

Springfield

13

Jacksonville

12

Danville

11

Peoria

10

Decatur

10

Galesburg

6

 

Average Temperature departure from Normal for the Midwest. Image from the MRCC.

Average Temperature departure from Normal for the Illinois. Image from the MRCC.

             

Precipitation varied greatly across central and southeast Illinois during August 2010. Across eastern Illinois, rainfall was 2 to 3 inches below normal, while in the west, rainfall was actually an inch above normal. During the hottest part of the month, large thunderstorm complexes developed across Iowa during the overnight hours, then diminished and moved into western Illinois.

 

Precipitation departure from Normal for the Midwest. Image from the MRCC.

Precipitation departure from Normal for the Illinois. Image from the MRCC.

Here are a few of the more significant weather events to occur across central Illinois during the month:

August 4th
A weak cold front moves through Illinois, and collides with the hot and humid airmass, resulting in strong to severe thunderstorms in the early evening hours. a few of the storms became severe and produced a few reports of wind damage in Virginia and in Danville.

August 9th
Showers and a few thunderstorms moved into west central Illinois during the early morning hours. This precipitation diminished as it moved east, producing rainfall amounts of 1 to 2 inches from Fulton County into western McLean County. For a precipitation map, click here.

August 10th
Another overnight thunderstorm complex developed in Iowa, and diminished as it moved into west central Illinois. However, this storm complex dumped 1 to 2.5 inches of rain, generally along and west of the Illinois River, before dissipating during the morning.

August 13th
Showers and thunderstorms developed ahead of a cold front that moved through Illinois in the afternoon hours. A few storms were severe and produced 60 mph winds across parts of Knox, Schuyler and Peoria Counties. In addition, rainfall amounts of 1 to 2 inches were observed across the western half of the state. For a precipitation map, click here. 

August 20th
Another cold front moved through Illinois, resulting in thunderstorms that produced very heavy rainfall. The heaviest rain fell in a swath from Scott to Christian Counties, where 2 to 3 inches of rain fell. For a precipitation map, click here.

Additional information:
Climate summary for Peoria
Climate summary for Springfield
Climate summary for Lincoln
Climate summary for Urbana/Champaign



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