A short line of storms moved southeast through Sheboygan County as an upper low pressure system drifted east across Wisconsin. One storm managed to pulse to severe limits and generate large hail.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS MKX wrote it up.
A short line of storms moved southeast through Sheboygan County as an upper low pressure system drifted east across Wisconsin. One storm managed to pulse to severe limits and generate large hail.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Milwaukee, WI wrote its last area forecast discussion before the first event at May 9, 2:49 AM CST, 8 hours 21 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI 349 AM CDT WED MAY 9 2007 .SHORT TERM...STRONG VORTICITY MAXIMUM IS NOW PROGRESSING INTO WEST CENTRAL WI AND IS PROGGED TO MOVE EWD TO LM BY 18Z. INITIAL BAND OF SHOWERS/TSTORMS HAS MOSTLY MOVED EWD OVER THE LAKE AND DEVELOPED WITHIN A PW AXIS OF 1.3 INCHES. DRY SLOT AHEAD OF UPPER LOW IS MOVING ACROSS THE STATE AND WILL LOWER PWS TO 0.8-1.00 INCHES. DRY SLOT WILL ALLOW FOR SCT CLOUD COVER THIS AM WITH RAPID HEATING EXPECTED. MLCAPES OF 300-400 J/KG TO DEVELOP WITH LITTLE TO NO CAPPING THIS MORNING. SCT TSTORMS TO CONTINUE NEAR UPPER LOW WITH NRN AND ERN CWA HAVING BEST CHANCES FOR RAIN GIVEN TIMING OF LOW MOVING THROUGH THE AREA. REMOVED POPS IN FAR WRN CWA THIS AFTERNOON AS RIDGING/CAPPING DEVELOPS IN THE WAKE OF THE UPPER LOW. FCST SOUNDINGS HANG ONTO INSTABILITY OVER EAST AND NRN CWA INTO THE AFTERNOON. .LONG TERM... OTHERWISE A STRONG ZONAL FLOW CONTINUES ACROSS SRN CANADA WITH LGT WINDS AND WARM TEMPS OVER THE GREAT LAKES THROUGH THU NT. LOW PRESSURE WILL MOVE EWD ACROSS ONTARIO ON THU WITH THE TRAILING CDFNT TO MOVE SWD THROUGH WI FRI AM. THIS WILL COOL TEMPS CLOSER TO SEASONAL NORMALS FOR THE WEEKEND. WARM ADVECTION WILL RETURN SAT NT/SUN WITH SMALL POPS FOR NOW. && .AVIATION...WEAK SURFACE PRESSURE PATTERN TO PERSIST NEXT 24 HOURS OVER SOUTHERN WISCONSIN WITH LIGHT AND VARIABLE SURFACE WINDS. OVER SOUTH CENTRAL WISCONSIN EXPECT VFR CIGS THRU 23Z...MVFR VISIBILITIES IN SCATTERED RAIN SHOWERS AND FOG THRU 15Z...THEN VFR VISIBILITIES. AFTER 23Z EXPECT SCT CLOUDS AT OR ABOVE 6000 AGL WITH UNRESTRICTED VISIBILITIES. OVER SOUTHEAST WISCONSIN EXPECT VFR CIGS THRU 02Z...MVFR CIGS IN WIDELY SCATTERED THUNDERSTORMS AND FOG THRU 15Z...THEN VFR VISIBILITIES. AFT 02Z EXPECT SCT CLOUDS AT OR ABOVE 5000 AGL WITH UNRESTRICTED VISIBILITIES. && .MKX WATCHES/WARNINGS/ADVISORIES... NONE. && 20/20/17
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI 1130 AM CDT WED MAY 9 2007 WIZ046-047-051-052-056>060-062>072-100930- MARQUETTE-GREEN LAKE-FOND DU LAC-SHEBOYGAN-SAUK-COLUMBIA-DODGE- WASHINGTON-OZAUKEE-IOWA-DANE-JEFFERSON-WAUKESHA-MILWAUKEE- LAFAYETTE-GREEN-ROCK-WALWORTH-RACINE-KENOSHA- 1130 AM CDT WED MAY 9 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EAST CENTRAL WISCONSIN...SOUTH CENTRAL WISCONSIN AND SOUTHEAST WISCONSIN. .DAY ONE...TODAY AND TONIGHT THERE IS A CHANCE OF THUNDERSTORMS TODAY. THE THUNDERSTORMS ARE NOT EXPECTED TO BECOME SEVERE. AREAS OF FOG ARE EXPECTED TO DEVELOP LATE TONIGHT ALONG WITH SOME LOCALLY DENSE FOG. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY AREAS OF FOG ARE EXPECTED THURSDAY MORNING WITH SOME LOCALLY DENSE FOG. THERE IS A CHANCE OF THUNDERSTORMS SATURDAY NIGHT THROUGH MONDAY NIGHT. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED. LMZ643>646-665-100930- SHEBOYGAN TO PORT WASHINGTON- PORT WASHINGTON TO NORTH POINT LIGHTHOUSE- NORTH POINT LIGHTHOUSE TO WIND POINT- WIND POINT TO WINTHROP HARBOR ILLINOIS- WISCONSIN ADJACENT OPEN WATERS OF LAKE MICHIGAN TO MID LAKE- 1130 AM CDT WED MAY 9 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF LAKE MICHIGAN. .DAY ONE...TODAY AND TONIGHT THERE IS A CHANCE OF THUNDERSTORMS TODAY. THE THUNDERSTORMS ARE NOT EXPECTED TO BECOME SEVERE. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY THERE IS A CHANCE OF THUNDERSTORMS SATURDAY NIGHT THROUGH MONDAY NIGHT. COLLAR WWW.WEATHER.GOV/MKX
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
1207 PM CDT WED MAY 09 2007
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1205 PM HAIL HOWARDS GROVE 43.83N 87.83W
05/09/2007 E0.25 INCH SHEBOYGAN WI LAW ENFORCEMENT
&&
DRHThe Green Bay radar (KGRB), 84 km away, was scanning. The volume nearest the first event began at 17:11 UTC.
1 hail. Local standard time, as filed.
Large hail the size of pennys to quarters covered the ground white just northwest of the city limits of Sheboygan. No damage was noted. As the storm eventually moved through the city of Sheboygan it dumped heavy rains of 0.81 inches in about 45 minutes. Water accumulated on some roads to a depth of 3 to 5 inches.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wisconsin in 2007Every state in 2007This day in weather historyWarnings in Wisconsin, May 2007
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 35672.