June Weather Summary -- Warm and Wet, With Frequent Severe Weather

Record Wet June in Some Areas

Total precipitation for June.  Image courtesy of the Midwestern Regional Climate Center Percentage of normal precipitation for June.  Image courtesy of the Midwestern Regional Climate Center.

Total June rainfall
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Percent of normal June rainfall
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The weather pattern during June featured a persistent storm track, which brought numerous weather systems across the area much of the month.  Several boundaries stalled over the area, and with the tropical airmass, heavy rains were common on several days.  New June rainfall records were established at Galesburg (13.24 inches), Lincoln (10.79 inches) and Havana (10.58 inches).   St. David, in Fulton County, reported 13.75 inches.  While the period of record here is too short to describe this total as a record-breaker, it was the highest official total observed in the state of Illinois for June.  The state as a whole averaged 7.8 inches of rain, its 2nd wettest June on record, surpassed by only June 1902 (8.37 inches).

Several rivers rose above flood stage, as a result of all this rain.  The Illinois, Spoon, Sangamon, and Wabash Rivers were most affected.  The Illinois River near Beardstown crested 11 feet above flood stage on the 29th, and the rain prolonged flooding that had begun near Beardstown and Havana in mid May.

Persistently Warm Weather

Average June temperatures.  Image courtesy of the Midwestern Regional Climate Center. Average temperature departure from normal for June.  Image courtesy of the Midwestern Regional Climate Center.

Average June temperatures
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Temperatures vs. normal
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The same weather pattern that kept the wet pattern over us also caused warm and humid weather much of the month, as upper level high pressure was parked just south of the area.  Average temperatures were 3 to 5 degrees above normal for the month.  Peoria and Springfield each had only 3 days during the month where the average temperature was below normal, while Lawrenceville reported 13 days with a high temperature of at least 90 degrees. 

Severe Weather a Common Occurrence

Severe weather reports for June
Preliminary severe weather reports from June.  Click image to enlarge.

The month was very active in terms of severe weather.  Reports of severe weather were received on 12 different days (2nd, 4th, 5th, 11-15th, 18th, and 21-23rd).  Much of the Midwest in general participated in this active period, with over 2,000 reports of severe weather from Minnesota to Ohio.  Some of the highlights include:

June 2 -- A bow echo line of storms began to push into areas northwest of the Illinois River very late on the 1st, and raced across much of central Illinois through sunrise on the 2nd.  Wind damage occurred across portions of northern Fulton County, from Fairview to Farmington; this was determined to be caused by wind gusts of 80 to 90 mph. 

June 5 -- A total of 19 tornadoes touched down across the northern half of Illinois; 8 of these occurred in central Illinois.  Two of these were rated at EF-2 intensity; one which moved through Elmwood in Peoria County, and one that affected areas between Washington and Metamora in Woodford County.   Peoria County was affected by 4 different tornadoes on this day, and has seen 5 tornadoes so far this year.  In comparison, a total of 6 tornadoes were reported for the 15-year period between 1995 and 2009 (with only 1 of those occurring since the turn of the century).  The EF-2 tornado in Elmwood was the strongest tornado to affect Peoria County since an F-2 tornado affected areas near Princeville in July 1981.  

June 18 -- A pair of derechoes (long-lasting lines of storms with extensive wind damage) rolled across Illinois; the first originated in Nebraska in the morning, and crossed the northern half of Illinois by mid-afternoon.  A second line of storms formed in western Iowa in the afternoon and rolled across the same areas in the evening.  While portions of central Illinois north of I-74 received some wind damage, the vast majority of damage occurred in areas along and north of I-80.

June 21 -- Supercell thunderstorms repeatedly formed over areas of east central Illinois east of Bloomington, and tracked southeast into portions of Vermilion County.  Two tornadoes occurred in northern Vermilion County, near East Lynn and Rossville.

June 24 -- As a cold front approached from the northwest, severe weather became widespread across central and northern Illinois.  Wind gusts as high as 75 mph were reported in Stark County, with wind damage reported in many areas as far south as the I-72 corridor.  Wind gusts as high as 85 mph occurred over portions of the Chicago metropolitan area.


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