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The 4.75" diameter hail observed two miles north-northwest of Minooka was the largest documented hail stone in Illinois since at least 1961, and according to the Illinois State Climatologist, may be the largest documented hail stone able to be verified on record in the state. More here.
A Severe Thunderstorm Warning was in effect for that area, including Minooka, issued at 7:05 pm.
|Photo of hail larger than softball size from near Minooka IL. This is the largest documented hail in Illinois since at least 1961.||Another photo from Minooka IL|
|Large hail between Morris and Minooka IL|
PUBLIC INFORMATION STATEMENT...UPDATED NATIONAL WEATHER SERVICE CHICAGO IL 942 PM CDT THU JUN 11 2015 ...GIANT HAIL RECORDED IN MINOOKA ON JUNE 10TH WAS THE SECOND LARGEST OBSERVED HAIL ON RECORD IN THE STATE OF ILLINOIS... SEVERAL SEVERE STORMS DEVELOPED ACROSS NORTHERN ILLINOIS ON WEDNESDAY JUNE 10TH. ONE OF THESE PASSED OVER MINOOKA ILLINOIS IN GRUNDY COUNTY BETWEEN 715 AND 725 PM AND PRODUCED ISOLATED GIANT HAIL OF UP TO OVER FOUR INCHES IN DIAMETER. THERE WAS A REPORT OF HAIL TO 4.75 INCHES IN DIAMETER FROM THE PUBLIC THAT WAS VERIFIED PHOTOGRAPHICALLY. SOME OF THIS HAIL CAUSED SEVERE DAMAGE TO VEHICLE WINDSHIELDS. LOOKING AT LARGE HAIL DATA THROUGH THE STORM DATA EVENTS DATABASE FROM THE NOAA NATIONAL CLIMATIC DATA CENTER /NCDC/...INFORMATION WAS RETRIEVED THAT MAY HELP TO PUT HAIL THIS SIZE INTO PERSPECTIVE. RECORDS ON HAIL DATA DATE BACK TO 1950 BUT BECAME MORE DETAILED AND ROBUST BEGINNING IN THE MID TO LATE 1990S. ACCORDING TO THE DATABASE: - THIS WAS THE SECOND LARGEST OBSERVED HAIL ON RECORD IN THE STATE OF ILLINOIS. THE LARGEST OBSERVED HAIL ON RECORD IN ILLINOIS WAS ON APRIL 23 1961...WHEN SIX INCH DIAMETER HAIL WAS REPORTED IN KANKAKEE COUNTY. - THERE HAVE BEEN 9 INSTANCES OF 4.5 INCH DIAMETER HAIL OBSERVED IN ILLINOIS...WHICH PREVIOUSLY TIED FOR THE SECOND LARGEST OBSERVED HAIL ON RECORD IN THE STATE. THE MOST RECENT OCCURRENCE WAS ON APRIL 28 2012 IN OKAWVILLE IN WASHINGTON COUNTY. - OVERALL...SINCE 1950...THERE HAVE BEEN ONLY 24 OCCURRENCES OF 4 INCH DIAMETER OR LARGER HAIL IN ILLINOIS AND ONLY 17 OCCURRENCES OF 4 INCH DIAMETER OR LARGER HAIL IN THE STATE OF INDIANA. - INCLUDING THE 1961 INSTANCE NOTED ABOVE...HERE ARE THE ONLY INSTANCES OF HAIL OF 4 INCHES OR LARGER IN THE NWS CHICAGO COUNTY WARNING AREA: KANKAKEE COUNTY: APRIL 23 1961: 6 INCH DIAMETER MINOOKA (GRUNDY): JUNE 10 2015: 4.75 INCH DIAMETER BOSWELL (BENTON): JUNE 14 2010: 4.25 INCH DIAMETER KANKAKEE COUNTY: JUNE 8 1981: 4 INCH DIAMETER COUNTYWIDE (BENTON): AUGUST 18 2001: 4 INCH DIAMETER DIXON (LEE COUNTY): JULY 13 2004: 4 INCH DIAMETER - SINCE 2005...HAIL OF THIS LARGE IN DIAMETER IS REPORTED ABOUT 35-40 TIMES A YEAR IN THE UNITED STATES. HOWEVER...ALMOST ALL OF THESE REPORTS ARE FROM THE PLAINS STATES. $$ RC/MTF
The National Weather Service received many photos of the large hail on Wednesday and these visual reports assisted us with warning messages to better stress the dangerous nature of the storms, as well as verification efforts after. Thank you!
It is important to remember that severe storms are dangerous, and hail to the size of Wednesday's can injure and be deadly. While photos may be beneficial to us, ensure safety first and foremost. It is absolutely fine if the hail pictures have to wait to after the storm has ended, because after all, hail of this size will take quite a while to melt!
A reminder that the best place to be in severe storms is inside and central in a sturdy structure, away from windows, and putting as many walls between you and the severe storm as possible.
|NWS Chicago Doppler Radar 0.5° Base Reflectivity Loop: 3:30 pm - 8:30 pm|
|SPC Mesoanalysis: Precipitable Water (in) at 6PM CDT 10June2015|
|SPC Mesoanalysis: Effective Shear at 6PM CDT 10June2015|
|SPC Mesoanalysis: MLCAPE at 6PM CDT 10June2015|