Scatttered severe storms produced large hail, and one report of a funnel cloud. A rotating wall cloud was observed by a trained spotter about 6 miles west of the Madison State Capitol.
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.
Scatttered severe storms produced large hail, and one report of a funnel cloud. A rotating wall cloud was observed by a trained spotter about 6 miles west of the Madison State Capitol. Some of the storms that became supercellur displayed moderate mesocyclones in their updraft towers. Synoptically, a warm front stalled over northern Illinois, resulting in sufficient vertical wind shear that supported rotating updrafts. However, the depth of the cooler air below the elevated convection prevented actual tornado development.
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 Mar 31, 2:39 PM CST, 2 hours 6 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI 339 PM CDT SAT MAR 31 2007 .DISCUSSION...FORECAST FOCUS ON SEVERE THUNDERSTORM POTENTIAL AND POSSIBLE HEAVY RAINFALL TONIGHT ASSOCIATED WITH CLOSED UPPER LOW LIFTING THROUGH THE REGION. .SHORT TERM...CURRENT BAND OF SHRA/TSTMS LIFTING THRU CWA ASSOCIATED WITH DIFF PVA WITH LEAD SHRT WAVE AHEAD OF MAIN CIRCULATION IN ERN NEBRASKA...AND LOW/MID LVL FRONTOGENETIC FORCING IN REGION BETWEEN 850MB WARM FRONT PUSHING THRU CWA NOW AND SFC WARM FRONT ACROSS NRN IL. WHILE SCATTERED SHOWERS AND THUNDERSTORMS WILL CONTINUE INTO THE EARLY EVENING...THE BEST CHANCE FOR SEVERE WEATHER IN THE CWA WIULL COME AFTER 00Z AS TIGHT DIFF PVA GRADIENT BETWEEN PVA/NVA COUPLET ASSOCIATED WITH MAIN VORTICITY MAXIMA SWEEPS ACROSS CWA BETWEEN 00Z AND 06Z...WITH THE SFC FRONT EXPECTED TO PUSH FM NEAR DBQ AND RFD AT 00Z TO A DELLS...MADISON TO LAKE GENEVA LINE AROUND 03Z. CURRENT LINE OF TSTMS EXTENDING FROM SRN IA INTO NE MO IN THIS VORTICITY GRADIENT AND REGION OF STRONGEST LOW TO MID LVL CONVERGENCE AHEAD OF DRY SLOT. EXPECT THIS BAND TO CONTINUE TO FILL IN AND LIFT NE TWDS CWA THIS AFTERNOON. SUPERCELL POTENTIAL INCREASES AS WELL AS SHEAR PROFILES IN LOWEST 3 KM ON RUC SOUNDINGS FOR MSN AT 03Z APPROACH 70 KTS...WITH 40 TO 45 KT 850 JET OVERLYING SE SFC FLOW. HOWEVER...SOUNDINGS ALSO SHOW A CAP AT 700MB AT 23Z AND ANOTHER AROUND 450MB AT 01-03Z...POSSIBLY WITH RELATIVELY WARMER AIR ALOFT DRAWN AHEAD OF MAIN 500MB CIRCULATION...THAT IS PREVENTING ANY ELEVATED PARCEL FROM GOING BEYOND THE FCST EQUILIBRIUM LEVEL OF 21K FT. IF THIS CAP IS AN ARTIFACT OF THE MODEL...NARROW BUT DEEP CAPE COULD BE IN PLACE AS BAND OF STORMS MOVES INTO CWA. ANOTHER LIMITIING POTENTIAL FOR SFC BASED STORMS IS INVERSION HEIGHT OF 2 K FT OR BETTER AT MSN THAT DEEPENS TO THE NORTHEAST. ELEVATED STORMS COULD STILL PRODUCE LARGE HAIL...WITH AN ISOLATED TORNADO NOT OUT OF THE QUESTION IN SWRN CWA ALONG/AHEAD OF SFC FRONT. PRECIPITABLE WATERS RISING TO BETWEEN 1.0 AND 1.1 INCH IN WARM CONVEYOR BELT SO SOME HEAVY RAINFALL WITH THUNDERSTORMS POSSIBLE...BUT QUICK MOVING NATURE OF EXPECTED LINE AND RELATIVELY NARROW BAND OF HIER PRECIP WATER WILL LIMIT ANY ONE AREA FROM SEEING ENOUGH FOR FLASH FLOODING...BUT STORMS AND RAINFALL WILL HAVE TO MONITORED. STORMS TAPER OFF FROM SW TO NE AS DRY WEDGE MOVES ACROSS SRN WI...BUT INSTABILITY WITH COLD POOL ALOFT WITH UPPER SYSTEM CROSSING RGN SUNDAY WILL BRING BACK SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS. HAVE KEPT LIKELY POPS FOR TOMORROW. BRIEF BREAK ON MONDAY AS WEAK UPPER RIDGING MOVES IN. WAA AHEAD OF POTENT WAVE APPROACHING FROM THE PLAINS BRINGS ISENTROPIC LIFT ACROSS SRN WI MONDAY NIGHT...WITH SFC LOW FCST TO MOVE ACROSS STATE ON TUESDAY...SO LIKLEY POPS ALSO KEPT FOR TUESDAY. COLDER AIR THEN DROPS ACROSS REGION TUESDAY NIGHT/WEDNESDAY BEHIND LOW. .LONG RANGE...MEDIUM RANGE MODELS STILL HAVING TIMING/PLACEMENT DIFFERENCES WITH DEPARTING LOW PRESSURE SYSTEM LATE TUESDAY AND WEDNESDAY. SLOWING TREND NOTED ON ALL MODELS OVER LAST RUNS HAVE MADE FAST ECMWF AN OUTLIER. HAVE AGAIN FOLLOWED BLENDED HPC SOLUTION WITH PREV FCST WX/POP IN LINE WITH TRENDS. SLOWING OF SYSTEM WOULD DELAY CAA PUSH UNTIL LATER TUE NGT/WED...SO RAIN/SNOW SHOWER POSSIBLITY STILL BEST AS UPPER LOW PASSES THRU DURING THIS TIME PERIOD. BELOW NORMAL TEMPS FOR THE END OF THE WEEK WITH 850MB TEMPS DROPPING INTO THE -12 TO -15 RANGE ON WED-FRI AND 1000-500 THICKNESS VALUES PLUMMETING INTO THE 522-525DM RANGE BEFORE A SLOW MODERATION BEGINS SAT. && .AVIATION...EXPCT MVFR CIGS AND VSBYS IN NMRS SHRA AND TSRA TIL ARND 07Z. GNRLY VFR CONDS AFT ARND 07Z...AND CONT THRU 18Z SUN. SCT SHRA XPCTD AFT 18Z SUN IN UNSTBL AMS. && .MKX WATCHES/WARNINGS/ADVISORIES... NONE. && 09/35
HAZARDOUS WEATHER OUTLOOK...UPDATE NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI 535 PM CDT SAT MAR 31 2007 WIZ046-047-051-052-056>060-062>072-010845- MARQUETTE-GREEN LAKE-FOND DU LAC-SHEBOYGAN-SAUK-COLUMBIA-DODGE- WASHINGTON-OZAUKEE-IOWA-DANE-JEFFERSON-WAUKESHA-MILWAUKEE- LAFAYETTE-GREEN-ROCK-WALWORTH-RACINE-KENOSHA- 535 PM CDT SAT MAR 31 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EAST CENTRAL WISCONSIN...SOUTH CENTRAL WISCONSIN AND SOUTHEAST WISCONSIN. .DAY ONE...TONIGHT THERE WILL BE PERIODS OF THUNDERSTORMS THIS EVENING AND SCATTERED THUNDERSTORMS AFTER MIDNIGHT. THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS EVENING. A FEW OF THE THUNDERSTORMS MAY PRODUCE LARGE HAIL...DAMAGING WINDS IN EXCESS OF 60 MPH AND ISOLATED TORNADOES...MAINLY SOUTH OF A LINE FROM KENOSHA TO MONTELLO. IN ADDITION...BRIEF HEAVY RAINFALL OF ONE HALF INCH TO ONE INCH THIS EVENING MAY CAUSE SOME RIVERS TO RISE ABOVE BANKFULL TOWARD FLOOD STAGE...AS WELL AS SOME MINOR STREET FLOODING. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY ISOLATED THUNDERSTORMS ARE POSSIBLE SUNDAY AFTERNOON. THERE IS A CHANCE OF THUNDERSTORMS MONDAY NIGHT WITH THUNDERSTORMS LIKELY ON TUESDAY. A FEW THUNDERSTORMS ON TUESDAY MAY APPROACH SEVERE LEVELS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL BE NEEDED. LMZ643>646-665-010845- 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- 535 PM CDT SAT MAR 31 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF LAKE MICHIGAN. .DAY ONE...TONIGHT THERE WILL BE PERIODS OF THUNDERSTORMS THIS EVENING AND SCATTERED THUNDERSTORMS AFTER MIDNIGHT. THE THUNDERSTORMS THIS EVENING MAY PRODUCE WIND GUSTS IN EXCESS OF 35 KNOTS AND SMALL HAIL. A SMALL CRAFT ADVISORY IS IN EFFECT TONIGHT. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY SMALL CRAFT ADVISORY IS IN EFFECT SUNDAY THROUGH SUNDAY EVENING. ISOLATED THUNDERSTORMS WILL BE POSSIBLE SUNDAY AFTERNOON. THERE IS A CHANCE OF THUNDERSTORMS MONDAY NIGHT WITH THUNDERSTORMS LIKELY ON TUESDAY. A FEW THUNDERSTORMS ON TUESDAY MAY APPROACH SEVERE LEVELS. TZ WWW.WEATHER.GOV/MKX
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI 541 PM CDT SAT MAR 31 2007 WIZ056-057-062>064-067>070-010000- SAUK-COLUMBIA-IOWA-DANE-JEFFERSON-LAFAYETTE-GREEN-ROCK-WALWORTH- INCLUDING THE CITIES OF...BARABOO...PORTAGE...WISCONSIN DELLS... DODGEVILLE...MADISON...JEFFERSON...LAKE MILLS...DARLINGTON... MONROE...JANESVILLE...BELOIT...ELKHORN...LAKE GENEVA 541 PM CDT SAT MAR 31 2007 ...TORNADO WATCH REMAINS IN EFFECT UNTIL MIDNIGHT CDT TONIGHT... AT 541 PM CDT...A LINE OF SEVERE THUNDERSTORMS WAS LOCATED ROUGHLY FROM QUINCY ILLINOIS...TO MUSCATINE IOWA...TO JUST EAST OF MANCHESTER...TO NEAR DECORAH IOWA. THIS LINE WAS MOVING NORTH NORTHEAST AROUND 45 MPH AND IS EXPECTED TO REACH WESTERN LAFAYETTE AND WESTERN IOWA COUNTIES AROUND 645 PM CDT. ISOLATED TORNADOES...DAMAGING WIND GUSTS TO 70 MPH...LARGE HAIL TO 1.5 INCHES IN DIAMETER...AND HEAVY RAINFALL WITH VIVID LIGHTNING ARE POSSIBLE WITH THIS LINE OF SEVERE THUNDERSTORMS. OTHER SCATTERED THUNDERSTORMS WERE DEVELOPING ACROSS NORTHWEST ILLINOIS AND SOUTHWEST WISCONSIN. THESE STORMS WILL CONTINUE TO AFFECT GREEN...LAFAYETTE...AND IOWA COUNTIES THROUGH 700 PM. SMALL HAIL TO 0.5 INCHES IN DIAMETER...HEAVY RAIN...AND VIVID LIGHTNING ARE POSSIBLE WITH THESE STORMS. FLOODING OF URBAN AND SMALL STREAM AREAS WILL BE POSSIBLE IN AREAS WITH THE MOST PERSISTENT HEAVY RAINFALL. DO NOT DRIVE YOUR CAR INTO A FLOODED AREA. BORGHOFF/TZ
The Green Bay radar (KGRB), 84 km away, was scanning. The volume nearest the first event began at 22:47 UTC.
1 lightning, 1 funnel cloud, 1 hail. Local standard time, as filed.
Lightning struck a city of Fond du Lac home. There was no fire, but the home's electrical wiring was damaged, and a hole was punched in the roof of a porch.
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, March 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: 23777, 23776, 23775.