July 11, 2009 Hailstorm Madison to Sun Prairie

At 2:15 A.M. CDT, large hail started to fall at the Dane County Regional Airport on the northeast side of the city of Madison.  The contract weather observers at the airport (who augment the automated NWS weather observations) reported hailstones up to 1.25 inches in diameter.  Other reports received from amateur radio operators, and law enforcement officials, indicated that large hail fell in a swath from the Madison airport over to about 6 miles northeast of Sun Prairie.  The largest measured stones were 1.5 inches in diameter.

The vehicle of a severe weather spotter (member of the MidWest Severe Storm Tracking/Response Center), on the northeast side of Madison sustained numerous dents and cracks, with damage in the thousands of dollars.  Other vehicles were damaged northeast of Sun Prairie.

Below is an image of the area most likely affected by the hailstones.  We'd like to get an idea of how many vehicles or other structures were damaged.  We document this information in our Storm Data publication.  If you live in Dane County within the "green box," we'd like to know how big the hailstones were in your area, and whether a vehicle or structure was damaged.  Or, perhaps you have a relative or friend who lives within the"green box" that might be able to provide some information.  Please send your information to rusty.kapela@noaa.gov.  Thanks in advance!

Eventually, the severe storm moved east into Jefferson County and eventually weakened.  However, if you live in Jefferson County and experienced large hailstones in the 230 am to 300 timeframe, then we'd like to hear from you as well!  Tell us how big your hailstones were and if there was any damage.

Dane County hailstone area



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