The map (below) is from the Storm Prediction Center (SPC) and shows the location of severe storm reports across the U.S. on 7 June 2008.
Many severe reports from southern Wisconsin that day.
The SPC lists 15 reports of tornadoes in Wisconsin on the 7th. There were 14 confirmed tornadoes from damage surveys - 8 in Milwaukee's county warning area (CWA) and 4 in the Wisconsin counties of the NWS-La Crosse CWA.
La Crosse's tornado summary of June 7th can be found here.
PUBLIC INFORMATION STATEMENT NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI 500 PM CDT TUE JUN 17 2008
...3RD LARGEST HAILSTONE IN STATE HISTORY OCCURRED ON JUNE 7 2008...
THIS INFORMATION IS SLIGHTLY DELAYED...AND IS FROM THE SEVEREWEATHER OUTBREAK ON JUNE 7TH OF THIS YEAR THAT AFFECTED MUCH OFSOUTHERN WISCONSIN.IT HAS BEEN DETERMINED THAT A 5 INCH DIAMETER HAILSTONE FELLAPPROXIMATELY 2 MILES EAST-NORTHEAST OF DELAFIELD AT ABOUT 435 PM ONJUNE 7 2008. THIS WAS MEASURED...AND THEN CONFIRMED BY A PHOTOSUBMISSION. THE PRECISE LOCATION WAS JUST WEST OF PEWAUKEELAKE...AND JUST TO THE EAST OF HIGHWAY 83 TO THE NORTH OFNAGA-WAUKEE GOLD COURSE.THIS HAIL REPORT CORRESPONDS WITH OTHER LARGE HAIL REPORTS FROMWAUKESHA COUNTY THAT DAY...WITH A FAIR NUMBER OF GOLFBALL...TO JUSTSHY OF SOFTBALL...SIZED REPORTS BEING RECEIVED.THE HARDEST HIT AREA BY LARGE HAIL APPEARS TO BE ANYWHERE FROMOCONOMOWOC TO DELAFIELD AND PEWAUKEE...AND THEN SOUTH TO THE WESTSIDE OF WAUKESHA. THIS IS APPROXIMATED BY THE NORTHWEST QUADRANT OFWAUKESHA COUNTY.
Record hail measurements from Wisconsin.
This chart (to the right) comes from the same web page (pasted above) as the June 7th hail report, giving sizes, dates, and locations of historical large hail in Wisconsin.
The year 1921 saw the largest hail ever measured in the state, 5.7" on the northern side of Wausau, in Marathon county.
And finally, this plea concludes the hail report from June 7th:
IF ANYBODY HAS VIDEO OR PICTURES OF HAIL STONES EQUAL TO...OR GREATER THAN BASEBALL SIZE /2.75 INCHES IN DIAMETER/...THEY ARE ENCOURAGED TO RELAY THEM TO THE NATIONAL WEATHER SERVICE IN SULLIVAN. YOU CAN CONTACT THE WEBMASTER ACCOUNT AT: