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HIGH risk of flash flooding today; heavy rains in June

July 23, 2010

The Hydrometeorological Prediction Center has placed much of northern Illinois in a moderate risk (10%) UPDATE 4:42PM: HIGH RISK (15%) for flash flooding through today.

This follows a June in which 10.10 inches was recorded from May 31, 7:00 AM through June 30, 7:00 AM. This is 278% of normal!

However, the last 10 days have been mostly dry, causing some lawns to brown in above-normal July heat. Any rain that initially falls will likely be absorbed by the parched ground.

Update 4:42PM: There is now a high risk of flash flooding in the Carol Stream. This is a potentially serious situation. Precipitation totals will be posted throughout the night and into tomorrow morning. A severe thunderstorm watch also remains in effect until 9:00 PM.

10:30 PM: A total of 0.15″ has fallen in Carol Stream. However, heavy rain began shortly after at 10:33 PM.

10:45 PM: A quick 0.12″ fell in 5 minutes starting at 10:33.

12:00 AM: 1.51″ of rain has fallen in the 30 minutes from 11:00 to 11:30, for a total of 1.78″ so far. Heavy rain has once again started to push south, and will continue through the morning.

1:20 AM: An additional 2.14″ of rain has fallen since 11:30, for a total of 3.92″ of rain so far. While the intensity of the rain has lessened, at least 5-6 hours of moderate to heavy rain remain.

1:50 AM: “Only” 0.36″ of rain has fallen since 1:20, for a total of 4.24″ of rain. Since 10:30 PM last night, an amount of rain exceeding the normal July total has fallen in Carol Stream (3.51″).

3:45 AM: Another 1.00″ of rain (exactly) has fallen, bringing the total to 5.24″. Klein Creek is well beyond its banks and above any level in the previous 5 years, except for September 2008. 2.25″ more rain is needed to match the September 13-14, 2008 total; with three more rounds of storms expected prior to 7 AM, this is likely to occur.

6:30 AM: An additional 1.77″ of rain has fallen in the last three hours, bringing the storm total to 7.19″. Damage similar to September 13-14, 2008 is expected to occur!

7:00 AM: The final total for today is 7.28″, a new one-day reporting record. This compares to 7.62″ as a result of the remnants of Hurricane Ike (plus 0.89″ the day after). Flooding is expected to be as severe as it was then.

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