Tag: heavy rains

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Warmer and Mostly Wetter July (so far)

The statewide average temperature for July 1-22, 2010, in Illinois is 77.2 degrees, 1.1 degrees above normal for this time period. The state average precipitation for the same period is 3.46 inches, 0.70 inches above normal.
Northern and eastern Illinois are a little drier on average. However, even those drier areas contain locations with very impressive rainfall amounts.

Midwest Rainfall
Midwestern rainfall for the period July 1-21, 2010. Map courtesy of NOAA's Midwestern Regional Climate Center.

Table 1. Temperature and precipitation amounts and departures from normal by climate division in Illinois for July 1-22, 2010. A map of the climate divisions can be seen below the table.

Climate Division Temperature (F) Depart (F) Rainfall (in) Depart (in)
Northwest 75.2 1.2 1.96 -0.86
Northeast 76.2 2.3 1.44 -1.41
West 76.9 0.4 6.54 3.58
Central 76.7 1.1 2.85 0.04
East 76.2 1.2 2.08 -0.88
South Southwest 77.5 0.4 5.05 -0.88
South Southeast 78.0 0.9 5.10 2.25
Southwest 79.3 1.0 2.89 0.39
Southeast 79.3 1.0 2.90 0.39
State 77.2 1.1 3.46 0.70
Illinois Climate Divisions
Illinois Climate Divisions (coincides with crop reporting districts as well).
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2nd Wettest June on Record

Illinois has experienced the 2nd wettest June on record, based on preliminary records through June 30. The statewide average rainfall was 7.8 inches, 3.7 inches above normal. The wettest June on record was 1902 with 8.37 inches. The rains over the weekend, especially north of I-80 and along I-70 caused this June to move up from fourth to second wettest June on record. Statewide records extend back to 1895. This number is provisional and may change slightly as more data comes in.
The larger rainfall totals occurred in the northern two-thirds of the state where amounts of 7 to 12 inches were common.  Meanwhile far southern Illinois remains closer to normal with amounts ranging from 3 to 6 inches.

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Wettest June on Record for Lincoln IL

The National Weather Service just posted the message below. As noted in an earlier posting Galesburg has already experienced its wettest June on record with 11.25 inches.

RECORD EVENT REPORT
NATIONAL WEATHER SERVICE LINCOLN IL
1055 PM CDT TUE JUN 22 2010
...RECORD DAILY MAXIMUM RAINFALL 2.46 INCHES IN LINCOLN IL JUNE 22...
...WETTEST JUNE ON RECORD IN LINCOLN WITH 9.85 INCHES SO FAR THIS
MONTH...
A RECORD RAINFALL OF 2.46 INCHES WAS SET AT LINCOLN IL TODAY WITH
2.42 INCHES FALLING IN LESS THAN 6 HOURS THIS MORNING. THIS BREAKS
THE OLD RECORD OF 2.33 INCHES SET IN 1924.
SO FAR THIS MONTH 9.85 INCHES OF RAIN HAS FALLEN IN LINCOLN THROUGH
JUNE 22ND AND THIS BECOMES THE WETTEST JUNE ON RECORD...JUST BEATING
THE 9.83 INCHES SET IN 1947. THERE ARE STILL EIGHT MORE DAYS IN THE
MONTH TO GET MORE PRECIPITATION...AND MORE HEAVY RAINS ARE STILL
POSSIBLE THROUGH WEDNESDAY NIGHT.
HUETTL
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Rains and Hot Weather Continue in Illinois

The wetter and warmer than normal weather continued in Illinois this week. For the period of June 16-22, the state average temperature was 76.8 degrees, 3.6 degrees above normal. Meanwhile the statewide average precipitation was 2.46 inches, 1.55 inches above normal.
Illinois already experienced above normal temperature and precipitation in the first half of June. Combined with this week’s weather, the statewide average temperature for June so far is 74.5 degrees, 3.4 degrees above normal. The statewide average precipitation at this point is 6.35 inches, 3.37 inches above normal.
If you are thinking that we must be closing in on a record, you are correct. Statewide this is already the 10th wettest June on record. The wettest June on record is 1902 with 8.37 inches. Several individual station records will be set as well. For example, Galesburg has already received 11.25 inches this month. This handily beat the old June record of 9.97 inches set in 1974. This is impressive given that their records go back to 1927.
The wettest areas of the state are western Illinois and east-central Illinois. Based on radar estimates and reports from weather observers, monthly totals of 9 inches or more were common in these areas. The wettest spot so far is Warsaw (Hancock County CoCoRaHS observer) which has reported 11.38 inches through today (June 22) with more rain falling after the regular reporting time.
Here are the precipitation and precipitation departure maps for June 1-22, 2010, for Illinois.

June 1-22, 2010 rainfall in Illinois
The June 1-22, 2010, rainfall in Illinois. Map courtesy of the NOAA Midwestern Regional Climate Center.

June 1-22, 2010 rainfall departure for Illinois
The June 1-22, 2010, rainfall departures from normal in Illinois. Map courtesy of the NOAA Midwestern Regional Climate Center.