Scattered, short lines of thunderstorms produced scattered reports of large hail across south-central and southeast Wisconsin. On the weather map a surface front extended from northern Iowa through central Illinois.
Every event with a place to put it. Tap one for its entry below.
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.
Scattered, short lines of thunderstorms produced scattered reports of large hail across south-central and southeast Wisconsin. On the weather map a surface front extended from northern Iowa through central Illinois. Mid-level, warm-air advection above a dry, cool, east to northeast surface flow fueled the thunderstorms.
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 Apr 30, 2:58 AM CST, 6 hours 19 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI 358 AM CDT MON APR 30 2007 .DISCUSSION...FCST FOCUS IS ON CONVECTION CHCS TODAY AND TNGT. 3 TO 5 MB PRES RISES IN WAKE OF COLD FROPA WITH NE WIND GUSTS UP TO 30. WITH THIS ISALLOBARIC RISE CENTER WEAKENING AND SHIFTING EAST...EXPECTING WINDS TO DIMINISH ESP WITH HI PRES RDG NOSING INTO ERN WI. 88-D/TERMINAL DOPPLER SHOWED BOUNDARY QUITE WELL PUSHING SWWD THRU THE CWA. LO PRES PROGGD INTO NRN IA BY 00Z TUE WITH SFC BOUNDARY BARELY EDGING INTO THE SW CWA LATER THIS AFTN...PER GFS AND NAM. MEANWHILE THE LOCAL WRF20 SHOWS A LITTLE MORE AGRESSIVE PUSH OF THE FRONT INTO THE CWA...AS FAR NE AS GREEN AND IOWA COUNTIES. THE H8 BAROCLINIC ZONE EXPECTED TO BE ACRS THE CWA WITH H8 MOIST CONVERGENCE/ASCENT INCREASING THIS AFTN AND TNGT. SHEAR PARAMETERS LOOK QUITE IMPRESSIVE AS DO MID LEVEL LAPSE RATES UP TO 8.0C. 40 KNOT SW LLJ WILL BE RIDING OVER THE LOWER LEVEL ESE WINDS NORTH OF THE SFC FRONT. CONCERN FOR TORNADO POTENTIAL INCREASES FURTHER SW INTO THE CWA CLOSER TO THE EXPECTED LOCATION OF SFC WARM FRONT. MODEL TRENDS ARE CONTINUING TO FAVOR THE NRN CWA FOR THE BEST FOCUS FOR ELEVATED STORMS AND THIS SEEMS REASONABLE GIVEN EXPECTED PLACEMENT OF THE H8 JET AND SPEED CONVERGENCE FAVORING LOCALES ACRS THE NRN CWA. BUFKIT SOUNDINGS BEAR OUT THE LOWER LEVEL INVERSION IN PLACE. ELEVATED CAPES ARE NOT AS IMPRESSIVE AS PRIOR RUNS. 305K ISENTROPIC PLOTS FROM BOTH THE GFS AND NAM SHOW THE PRESSURE ADVECTION INCREASING BY 18Z AND THROUGH THE AFTN HRS WITH THE LOWEST COND PRES DEFICITS ACRS THE NRN CWA...IN LINE WITH WHERE MODELS ARE PLACING THE AXIS OF QPF. THUS HIGHEST POPS IN NRN CWA FOR THIS AFTN. UPR DVRG PEAKS BETWEEN 0-6Z TUE WITH H7 OMEGA PEAKING ARND 3Z WHILE H8 MOIST CONV MAXES OUT BETWEEN 21-03Z....SO THE TIMING OF THE FAVORED FORCING IS LATER TODAY AND INTO THE EVENING HOURS. H8 LOW SHIFTS EAST OF OUR AREA TOMORROW WITH CAA KICKING IN. A COMFORTABLY COOL PATTERN THROUGH FRIDAY WITH SINGLE DIGIT H8 TEMPS. && 10 .AVIATION...SFC FNTL BNDRY WILL SAG INTO NRN IL BY 12Z...THEN RMN NRLY STNRY THRU THE MORNING. VFR CIGS AND VSBYS WL CONT THRU 18Z MON. AS LOW PRES APPCHS FROM THE PLAINS BNDRY WILL LIFT BACK TO THE NORTH AS A WARM FRONT. SCT SHRA/TSTMS WILL DEVELOP AND SPREAD ACROSS SRN WI BETWEEN 21Z AND 00Z. && .MKX WATCHES/WARNINGS/ADVISORIES... NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI 442 AM CDT MON APR 30 2007 WIZ046-047-051-052-056>060-062>072-010945- MARQUETTE-GREEN LAKE-FOND DU LAC-SHEBOYGAN-SAUK-COLUMBIA-DODGE- WASHINGTON-OZAUKEE-IOWA-DANE-JEFFERSON-WAUKESHA-MILWAUKEE- LAFAYETTE-GREEN-ROCK-WALWORTH-RACINE-KENOSHA- 442 AM CDT MON APR 30 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EAST CENTRAL WISCONSIN...SOUTH CENTRAL WISCONSIN AND SOUTHEAST WISCONSIN. .DAY ONE...TODAY AND TONIGHT THUNDERSTORMS ARE LIKELY THIS AFTERNOON ALONG AND NORTH OF A LONE ROCK TO MEQUON LINE...AND ACROSS ALL OF SOUTHERN WISCONSIN THIS EVENING. THERE IS A SLIGHT RISK SOME OF THE THUNDERSTORMS COULD BE SEVERE WITH DAMAGING WIND GUSTS AND LARGE HAIL...ESPECIALLY WEST OF A DELLS...MADISON TO JANESVILLE LINE. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY THERE IS A CHANCE FOR THUNDERSTORMS FOR SOUTH CENTRAL WISCONSIN SATURDAY NIGHT...AND FOR ALL OF SOUTHERN WISCONSIN SUNDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED THIS AFTERNOON AND EVENING...ESPECIALLY FOR SOUTH CENTRAL WISCONSIN. LMZ643>646-665-010945- 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- 442 AM CDT MON APR 30 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF LAKE MICHIGAN. .DAY ONE...TODAY AND TONIGHT THUNDERSTORMS ARE LIKELY NORTH OF MILWAUKEE THIS AFTERNOON...AND FOR ALL THE NEAR SHORE WATERS OUT TO MID-LAKE TONIGHT. WINDS MAY EXCEED 34 KNOTS IN SOME OF THE STRONGER STORMS. CONDITIONS MAY REACH SMALL CRAFT ADVISORY CRITERIA AFTER MIDNIGHT TONIGHT INTO TUESDAY MORNING. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY THERE IS A CHANCE FOR THUNDERSTORMS SUNDAY. REM WWW.WEATHER.GOV/MKX
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
1009 AM CDT MON APR 30 2007
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1005 AM HAIL BARABOO 43.47N 89.74W
04/30/2007 E0.50 INCH SAUK WI LAW ENFORCEMENT
DIME SIZE HAIL REPORTED BY 911 DISPATCH SAUK COUNTY.
&&
JCRAVENThe Milwaukee radar (KMKX), 46 km away, was scanning. The volume nearest the first event began at 15:15 UTC.
8 hail, 1 lightning. Local standard time, as filed.
Hail shower lasted about 4 minutes, and resulted in slight damage (dents) to several vehicles.
Lightning struke a pole-jumper, resulting in a power outage that affected 2000 customers in the city.
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, April 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: 29864, 29865, 29866, 29863, 29867, 29868, 29859, 29871, 29883.