Thunderstorms developed over northeast Iowa Wednesday evening before tracking over east central Wisconsin overnight on May 2nd into the morning of May 3rd. 5 inches of rain over east central Wisconsin.
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 GRB wrote it up.
Thunderstorms developed over northeast Iowa Wednesday evening before tracking over east central Wisconsin overnight on May 2nd into the morning of May 3rd. Rainfall measurements for the 24 hour period ending around 7 am CDT indicated a widespread 2 to 4.5 inches of rain over east central Wisconsin. A roughly 15 mile wide core of higher rainfall amounts, more than 4 inches, fell from Berlin to Omro to Oshkosh to Stockbridge to Brillion to Francis Creek.
The highest reported rainfall totals in Winnebago County were 4.50 inches near Oshkosh and 3.56 inches near Omro. Stockbridge, with 3.57 inches, and Chilton, with 3.39 inches, had the highest totals in Calumet County. The highest totals in Manitowoc County were 3.12 inches at Francis Creek and 3.07 inches at the Manitowoc River gage.
The heavy rainfall led to flashing flooding in Winnebago County, Calumet County, and Manitowoc County that closed roads, washing out at least one, flooded basements, and caused the Manitowoc River to rapidly rise to near flood stage. There was also some urban flooding in Outagamie County. The storms produced hail up to nickel size, and lightning from one of the storms started a fire at a barn. The fire destroyed the barn and killed 13 show horses.
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 Green Bay, WI wrote its last area forecast discussion before the first event at May 2, 10:21 PM CST, 2 hours 14 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GREEN BAY WI 1121 PM CDT WED MAY 2 2012 UPDATED AVIATION PORTION FOR 06Z TAF ISSUANCE .UPDATE...MADE SOME MINOR ADJUSTMENTS TO PCPN TRENDS AND ADDED A MENTION OF HEAVY RAINFALL TO PARTS OF C/NE/EC WI OVERNIGHT. A SMALL CLUSTER OF SVR TSTMS WITH LARGE HAIL HAVE PERSISTED FOR SEVERAL HOURS OVER SOUTHERN MN...AND ARE NOW MOVG EAST INTO WC WI. THESE ARE DEVELOPING JUST NORTH OF A WARM FRONT...WHICH EXTENDS EASTWARD INTO CENTRAL WI. SHOWERS ARE INCREASING RAPIDLY OVER SOUTHERN WI AND HEADING TOWARD C/EC WI...IN RESPONSE TO MOISTURE CONVERGENCE AND INCREASING MUCAPE ON THE NOSE OF 30-40 KT LLJ. OTHER CONVECTION WAS OCCURRING OVER THE EASTERN DAKOTAS...IN RESPONSE TO A S/W TROF AND THE RRQ OF A STG UPPER LEVEL JET. THE BIG QUESTION IS HOW ALL OF THIS WILL COME TOGETHER OVERNIGHT. THE 23Z HRRR SEEMED TO HAVE A PRETTY GOOD HANDLE ON ALL THREE OF THESE AREAS OF PCPN. THE HRRR GENERALLY WEAKENS THE CURRENT CLUSTER OF STORMS IN WC WI AS IT MOVES TOWARD C WI. THIS MAY HAPPEN AS THE DEVELOPING CONVECTION IN SOUTHERN WI TAKES OFF AND CUTS OFF THE MOISTURE INFLOW. EVEN SO...THERE COULD BE A BRIEF WINDOW OF OPPORTUNITY FOR LARGE HAIL IN C WI BETWEEN 04Z-06Z. MODELS GENERALLY AGREE THAT A LARGE AREA OF SHOWERS AND TSTMS WILL DEVELOP OVER C/EC/FAR NE WI DURING THE OVERNIGHT PERIOD... WITH A THREAT OF HEAVY RAINFALL AS H8 DEW POINTS INCREASE TO +10 TO +12 C AND PW SURGES TO NEAR 1.5 INCHES. THE CONVECTION OVER THE NORTHERN PLAINS MAY BRUSH OUR FAR NORTHWEST COUNTIES LATE TONIGHT. KIECKBUSCH && .PREV DISCUSSION...ISSUED AT 655 PM CDT WED MAY 2 2012... SHORT TERM...TONIGHT AND THURSDAY. THE LATEST RUC ANALYSIS AND SATELLITE/RADAR IMAGERY SHOW LOW PRESSURE SITUATED OVER WESTERN KANSAS EARLY THIS AFTERNOON...AND A COLD FRONT EXTENDING NORTHEAST INTO THE NORTHERN MISSISSIPPI VALLEY. AN OUTFLOW BOUNDARY FROM THIS MORNINGS CONVECTION HAS REACHED INTO NORTHERN MISSOURI AND CENTRAL ILLINOIS...THOUGH CONVECTION HAS YET TO RE-DEVELOP. CLOUD COVER HAS BEEN BUILDING ACROSS IOWA THIS AFTERNOON WHERE THETAE ADVECTION IS ONGOING...BUT NO SIGN OF PRECIP HERE EITHER. MEANWHILE...MIXING INTO DRY AIR ALOFT HAS DISSIPATED THIS MORNINGS CLOUD COVER INTO SCATTERED CU OVER MUCH OF THE FORECAST AREA. AS A LOW LEVEL JET DEVELOPS AHEAD THE LOW PRESSURE AND CONVECTION DEVELOPS UPSTREAM...SEVERE WEATHER CHANCES AND PRECIP AMOUNTS ARE THE MAIN FORECAST CONCERNS. TONIGHT...PLENTY OF UNCERTAINTY WITH THE DETAILS CONCERNING POTENTIAL CONVECTION. SHORTWAVE TROUGH OVER MONTANA WILL LIFT NE OVER NORTH DAKOTA AND INTO SOUTH-CENTRAL CANADA. SW FLOW ALOFT WILL KEEP LOW PRESSURE OVER THE CENTRAL PLAINS WHILE THE COLD FRONT BECOMES MORE PERPENDICULAR TO THE LOW LEVEL FLOW OVER IOWA AND INTO WISCONSIN. AHEAD OF THE SURFACE LOW...A SOUTH TO SOUTHWEST LLJ WILL DEVELOP LATE THIS AFTERNOON INTO THIS EVENING POINTING INTO IOWA AND NORTHERN ILLINOIS. GOOD MASS CONVERGENCE ON THE NOSE OF THIS LLJ IN AN AREA OF MU CAPE 1500-2000 J/KG AND MID-LEVEL LAPSE RATES OF 7 TO 7.5 C/KM SHOULD BE SUFFICIENT TO TRIGGER ELEVATED CONVECTION. FORWARD PROPAGATING CORFIDI VECTORS WOULD TRACK SUBSEQUENT MCS ENE...THOUGH AM EXPECTING THE STRONGEST THUNDERSTORMS TO FOLLOW THE GREATEST INSTABILITY OVER THE SOUTHERN 1/3RD OF THE BADGER STATE AND NORTHERN ILLINOIS. THE 12Z GFS DOES TRY TO RAM THE LLJ INTO EAST-CENTRAL WISCONSIN ALONG WITH AMPLE INSTABILITY...BUT THINK THIS IS TOO AMBITIOUS GIVEN THE WSW FLOW ALOFT AND WITHOUT MUCH MID-LEVEL HEIGHT RISES. THE FLOW DOES TURN A BIT MORE SW OVERNIGHT AS THE RIGHT REAR QUAD OF A JET STREAK SHIFTS INTO NORTHERN WISCONSIN...SO AM EXPECTING TO SEE A MORE NORTHWARD PUSH OF THE NOCTURNAL CONVECTION ACROSS THE FORECAST AREA AFTER MIDNIGHT. WITH THE ELEVATED INSTABILITY AXIS REMAINING TO OUR SOUTH...HAVE A HARD TIME GETTING EXCITED ABOUT SEVERE CHANCES...THOUGH ALWAYS TOUGH TO RULE OUT A MARGINAL SEVERE STORM ADVECTING INTO THE SOUTHERN FORECAST AREA. WILL KEEP A MENTION OF SEVERE POSSIBILITIES FOR CENTRAL AND EAST-CENTRAL WISCONSIN...MAINLY FOR LARGE HAIL...AND STRONG WINDS TO A LESSER EXTENT. CENTRAL AND EAST-CENTRAL WISCONSIN WILL LIKELY SEE SUBSTANTIAL RAINFALL...WITH SOME GUIDANCE POINTING TOWARDS WELL OVER AN INCH OF RAIN. WILL TRY TO CAP IT AROUND THERE...SINCE THE GREATER INSTABILITY IS SOUTH OF THE FORECAST AREA. THURSDAY...MORNING CONVECTION MAY VERY WELL BE ONGOING AT THE START OF THE PERIOD...AS THE RIGHT REAR QUAD OF THE JET STREAK WILL BE OVERHEAD WHILE 850MB CONVERGENCE WILL BE DRAPED OVER CENTRAL WISCONSIN. THINK THE MORNING MAY TURN OUT TO BE WETTER THAN MODELS INDICATE AND WILL KEEP THE NEAR CATEGORICAL POPS IN THE FORECAST. INSTABILITY WILL BE THE QUESTION MARK FOR THE AFTERNOON...AS THE WARM FRONT WILL REMAIN STALLED ACROSS THE AREA. THE RIGHT REAR QUAD OF THE JET STREAK WILL PULL OUT BY THE AFTERNOON...BUT WILL DAYTIME HEATING LEAD TO CLEARING...DESPITE AMPLE MOISTURE THROUGH THE COLUMN? THINK ANY BREAKS WILL JUST LEAD TO CU BUILD-UP...RESULTING IN A MOSTLY CLOUDY DAY REGARDLESS. STILL SOME CAPE TO BE HAD...SO CANNOT RULE OUT SCATTERED COVERAGE OF SHOWERS AND STORMS THROUGH THE AFTERNOON. WILL MAKE ONLY COSMETIC CHANGES TO POPS. HIGHS IN THE LOW TO MID 70S. LONG TERM...THURSDAY NIGHT THROUGH NEXT WEDNESDAY. PCPN CHANCES WILL BE THE PRIMARY FORECAST ISSUE DURING THIS PERIOD. BUSY WSW FLOW TO CONTINUE INTO FRIDAY BEFORE MEDIUM RANGE MODELS IN AGREEMENT WITH BRIEFLY BUILDING AN UPPER RIDGE OVER THE WESTERN GREAT LAKES REGION SATURDAY INTO SUNDAY. THIS UPPER RIDGE BEGINS TO FLATTEN LATE IN THE WEEKEND WITH A RETURN TO A SOUTH TO SOUTHWEST FLOW AHEAD OF A SHORT WAVE TROUGH. MEANWHILE THE SURFACE BOUNDARY WITH BEST INSTABILITY DROPS WELL SOUTH OF THE FORECAST AREA LATER FRIDAY INTO FRIDAY NIGHT WITH AN EAST TO NORTHEAST FLOW AROUND A SURFACE HIGH OVER SOUTHERN CANADA. WOULD NORMALLY BE AGGRESSIVE WITH ENDING POPS IN THIS SCENARIO...BUT MDM RANGE MODELS ARE CONSISTENTLY LINGERING A WEAK H8 BOUNDARY OVER WISCONSIN FOR A POSSIBLE FOCUS OF CONVECTION FOR AT LEAST A CHANCE OF SHOWERS. THIS H8 BOUNDARY WITH WARMER H8 TEMPS WERE PRODUCING TOTAL TOTAL VALUES IN THE LOWER 50S...ESPECIALLY TOWARD WESTERN WISCONSIN. IN ADDITION...BEST UPPER JET DYNAMICS LINGER ACROSS THE NORTHERN GREAT LAKES REGION TO PROVIDE AREAS OF LIFT. FOR THE NEW WORK WEEK...A PROGGED DEEPENING UPPER TROUGH WITH FRONTAL SYSTEM WILL PROVIDE MORE EVEN PCPN CHANCES OF PCPN THROUGH AT LEAST WEDNESDAY BEFORE A HIGH PRESSURE RIDGE TRIES TO BUILD IN FROM THE NORTHERN PLAINS AND CANADA. BY MID WEEK NEXT WEEK PCPN CHANCES MAY BE PRIMARILY DIURNAL VARIETY AS THE UPPER TROUGH SLOWLY DRIFTS OVER. HYDROLOGY...RAINFALL AMOUNTS OVER CENTRAL AND EAST CENTRAL WISCOMSIN FROM LAST NIGHS CONVECTION RANGED FROM 0.40 TO 0.80 INCHES. MORE RAIN IS ANTICIPATED TONIGHT INTO THRUSDAY MORNING AS A WARM FRONT LIFTS INTO SOUTHERN AND CENTRAL WISCONSIN. PWATS APPROACH 1.50 BY THURSDAY MORNING. AT THIS TIME BETWEEN 1 TO 1.50 INCHES AREAS RAIN IS EXPECTED FROM TONIGHT THROUGH NOON THURSDAY. DO NOT EXPECT FLOODING AT THESE NUMBERS...BUT IF STORMS BECOME MORE WIDESPREAD AND CAN TRAIN ALONG THE WARM FRONT...LOCALLY HIGHER AMOUNTS POSSIBLE. MAIN STEM RIVERS ARE FAIRLY LOW SO RUNOFF IS NOT EXPECTED TO IMPACT RIVERS...HOWEVER SMALL STREAMS MAY BEGIN TO BECOME SWOLLEN IF THE HIGHER AMOUNTS VERIFY. && .AVIATION...SHOWERS AND TSTMS WERE DEVELOPING OVER C/EC WI LATE THIS EVG...AND SHOULD BRING SMALL HAIL...HEAVY RAINFALL AND MVFR/IFR CONDITIONS TO AREAS SE OF A LINE FROM AUW TO MNM OVERNIGHT. ADDITIONAL SHOWERS AND STORMS APPROACHING FROM THE NORTHERN PLAINS AND NORTHERN MN MAY BRUSH THROUGH NC WI LATE TONIGHT INTO EARLY THURSDAY. THE SHOWERS AND TSTMS ARE EXPECTED TO TAPER OFF BY THURSDAY MORNING...WITH A MIX OF VFR AND MVFR CONDITIONS EXPECTED DURING THE DAY. SCT TSTMS MAY REDEVELOP AS A COLD FRONT SAGS SE ACROSS THE FORECAST AREA THURSDAY AFTERNOON AND EARLY EVG. KIECKBUSCH && .GRB WATCHES/WARNINGS/ADVISORIES... NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GREEN BAY WI 255 PM CDT WED MAY 2 2012 WIZ005-010>013-018>022-030-031-035>040-045-048>050-073-074-032000- VILAS-ONEIDA-FOREST-FLORENCE-NORTHERN MARINETTE-LINCOLN-LANGLADE- MENOMINEE-NORTHERN OCONTO-DOOR-MARATHON-SHAWANO-WOOD-PORTAGE- WAUPACA-OUTAGAMIE-BROWN-KEWAUNEE-WAUSHARA-WINNEBAGO-CALUMET- MANITOWOC-SOUTHERN MARINETTE-SOUTHERN OCONTO- 255 PM CDT WED MAY 2 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL AND NORTHEAST WISCONSIN. .DAY ONE...TONIGHT AFTER A LULL IN THE RAIN THROUGH EARLY THIS EVENING...ADDITIONAL STORMS ARE EXPECTED TO RE-DEVELOP. HEAVY RAINFALL IS POSSIBLE TONIGHT AS THESE THUNDERSTORMS AFFECT THE AREA. ADDITIONALLY...A FEW STORMS COULD ALSO PRODUCE STRONG WINDS AND LARGE HAIL OVER CENTRAL AND EAST-CENTRAL WISCONSIN. MOIST AIR FLOWING ACROSS LAKE MICHIGAN COULD RESULT IN FOG NEAR THE LAKESHORE AT TIMES. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH WEDNESDAY THE STORMS THAT FORM OVERNIGHT WILL PROBABLY LINGER INTO EARLY THURSDAY...THEN BECOME MORE SCATTERED DURING THE DAY. IF THE MORNING STORMS DECREASE EARLY ENOUGH IN THE DAY...SOME LATE DAY STORMS COULD AGAIN POSE A RISK OF SEVERE WEATHER. MOIST AIR FLOWING ACROSS LAKE MICHIGAN COULD RESULT IN FOG NEAR THE LAKESHORE AT TIMES THROUGH THURSDAY NIGHT. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NECESSARY TONIGHT. IN ADDITION...SPOTTERS ARE REQUESTED TO FORWARD RAINFALL MEASUREMENTS TO THE NATIONAL WEATHER SERVICE IN GREEN BAY. LMZ521-522-541>543-032000- THE BAY OF GREEN BAY SOUTH OF A LINE FROM CEDAR RIVER MI TO ROCK ISLAND PASSAGE-LAKE MICHIGAN FROM WASHINGTON ISLAND TO SHEBOYGAN- 255 PM CDT WED MAY 2 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHWEST LAKE MICHIGAN AND THE WATERS OF GREEN BAY. .DAY ONE...TONIGHT FOG COULD POSE A HAZARD TO MARINE INTERESTS AT TIMES THROUGH TONIGHT. THUNDERSTORMS ARE EXPECTED AGAIN TONIGHT. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH WEDNESDAY FOG IS LIKELY TO POSE A HAZARD TO MARINE INTERESTS AT TIMES THROUGH THURSDAY NIGHT. THUNDERSTORMS ARE ALSO POSSIBLE AT TIMES AGAIN THURSDAY AND THURSDAY NIGHT.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GREEN BAY WI 949 PM CDT WED MAY 2 2012 WIZ035-030500- WOOD- INCLUDING THE CITY OF...WISCONSIN RAPIDS 949 PM CDT WED MAY 2 2012 ...THUNDERSTORMS WITH HAIL AND HEAVY RAINFALL EXPECTED OVER WOOD COUNTY LATE THIS EVENING AND EARLY THURSDAY MORNING... THUNDERSTORMS WILL INCREASE RAPIDLY ACROSS WOOD COUNTY LATE THIS EVENING... AND WILL LIKELY PRODUCE SMALL HAIL AND HEAVY RAINFALL. A STRONG TO SEVERE THUNDERSTORM OVER WEST CENTRAL WISCONSIN IS EXPECTED TO REACH SOUTHWEST WOOD COUNTY BETWEEN MIDNIGHT AND 1230 AM. IF IT MAINTAINS ITS STRENGTH... IT MAY PRODUCE SOME LARGE HAIL AS IT MOVES ACROSS SOUTHERN WOOD COUNTY. WIZ036>040-045-048>050-030500- PORTAGE-WAUPACA-OUTAGAMIE-BROWN-KEWAUNEE-WAUSHARA-WINNEBAGO- CALUMET-MANITOWOC- INCLUDING THE CITIES OF...STEVENS POINT...APPLETON...GREEN BAY... ALGOMA...WAUTOMA...OSHKOSH...CHILTON...TWO RIVERS 949 PM CDT WED MAY 2 2012 ...THUNDERSTORMS WITH HAIL AND HEAVY RAINFALL EXPECTED LATE THIS EVENING AND EARLY THURSDAY MORNING... THUNDERSTORMS WILL INCREASE RAPIDLY ACROSS CENTRAL AND EAST CENTRAL WISCONSIN...INCLUDING THE FOX VALLEY...LATE THIS EVENING. THESE STORMS WILL LIKELY PRODUCE SMALL HAIL AND HEAVY RAINFALL. DURING THE OVERNIGHT PERIOD...LOCAL RAINFALL AMOUNTS IN EXCESS OF AN INCH ARE EXPECTED. KIECKBUSCH
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GREEN BAY WI 1106 PM CDT WED MAY 2 2012 WIZ035-036-030445- PORTAGE-WOOD- 1106 PM CDT WED MAY 2 2012 ...STRONG THUNDERSTORM MOVING ACROSS SOUTHEAST WOOD AND PORTAGE COUNTY... AT 1103 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM 8 MILES SOUTH OF WISCONSIN RAPIDS...MOVING EAST AT 35 MPH. NICKEL SIZE HAIL...WINDS 40 TO 45 MPH...FREQUENT CLOUD TO GROUND LIGHTNING...BRIEF HEAVY DOWNPOURS...ARE POSSIBLE WITH THIS STORM. * THE THUNDERSTORM WILL BE NEAR... AMHERST BY 1145 PM CDT... GUSTY WINDS MAY CAUSE SMALL OBJECTS SUCH AS TRASH BINS TO BLOW AROUND. STAY AWAY FROM HIGH OBJECTS OUTDOORS SUCH AS TREES. SEEK SHELTER IN A STURDY STRUCTURE UNTIL THIS STORM HAS PASSED. BERSCH
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GREEN BAY WI 1138 PM CDT WED MAY 2 2012 WIZ035-030515- WOOD- 1138 PM CDT WED MAY 2 2012 ...SIGNIFICANT WEATHER ADVISORY... AT 1134 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM 26 MILES WEST OF WISCONSIN RAPIDS...MOVING NORTHEAST AT 30 MPH. PENNY SIZE HAIL...WINDS 40 TO 45 MPH...FREQUENT CLOUD TO GROUND LIGHTNING AND BRIEF HEAVY DOWNPOURS ARE POSSIBLE WITH THIS STORM. * THE THUNDERSTORM WILL BE NEAR... PITTSVILLE BY MIDNIGHT CDT... GUSTY WINDS MAY CAUSE SMALL OBJECTS SUCH AS TRASH BINS TO BLOW AROUND. STAY AWAY FROM HIGH OBJECTS OUTDOORS SUCH AS TREES. SEEK SHELTER IN A STURDY STRUCTURE UNTIL THIS STORM HAS PASSED. KIECKBUSCH
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GREEN BAY WI 1247 AM CDT THU MAY 3 2012 WIZ022-031-035>040-045-048>050-074-030815- DOOR-SHAWANO-WOOD-PORTAGE-WAUPACA-OUTAGAMIE-BROWN-KEWAUNEE- WAUSHARA-WINNEBAGO-CALUMET-MANITOWOC-SOUTHERN OCONTO- INCLUDING THE CITIES OF...STURGEON BAY...WISCONSIN RAPIDS... STEVENS POINT...APPLETON...GREEN BAY...ALGOMA...WAUTOMA... OSHKOSH...CHILTON...TWO RIVERS 1247 AM CDT THU MAY 3 2012 ...THUNDERSTORMS WITH TORRENTIAL RAINFALL WILL AFFECT CENTRAL WISCONSIN AND THE FOX VALLEY AND LAKESHORE AREAS OVERNIGHT... NUMEROUS THUNDERSTORMS WILL IMPACT CENTRAL WISCONSIN...THE FOX VALLEY AND THE LAKESHORE COUNTIES EARLY THIS MORNING. ALTHOUGH SOME SMALL HAIL IS POSSIBLE...BY FAR THE BIGGEST THREAT WILL BE HEAVY RAINFALL. POCKETS OF TORRENTIAL RAINFALL CAN BE EXPECTED...WITH LOCAL RAINFALL AMOUNTS OF 1 TO 2 INCHES LIKELY THROUGH DAYBREAK. THE HEAVY RAINFALL WILL RESULT IN WATER PONDING ON THE ROADS...AND CAUSE SOME FLOODING OF LOW LYING URBAN AREAS. MOTORISTS SHOULD USE EXTREME CAUTION TONIGHT...AS HEAVY RAINFALL MAY REDUCE VISIBILITIES TO LESS THAN A MILE AT TIMES...AND WATER COVERED ROADS MAY LEAD TO HYDROPLANING. KIECKBUSCH
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GREEN BAY WI 120 AM CDT THU MAY 3 2012 WIZ036>038-030715- OUTAGAMIE-PORTAGE-WAUPACA- 120 AM CDT THU MAY 3 2012 ...STRONG THUNDERSTORMS HEADED FOR WAUPACA AND OUTAGAMIE COUNTIES... AT 111 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM BIG FALLS TO IOLA TO HARTMAN CREEK STATE PARK...MOVING EAST AT 40 MPH. PEA SIZE HAIL...WINDS 40 TO 45 MPH...FREQUENT CLOUD TO GROUND LIGHTNING AND TORRENTIAL DOWNPOURS...ARE LIKELY WITH THESE STORMS. RAINFALL AMOUNTS AROUND AN INCH MAY OCCUR IN LESS THAN 30 MINUTES. * THUNDERSTORMS WILL BE NEAR... WAUPACA BY 130 AM CDT... NEW LONDON BY 145 AM CDT... BLACK CREEK BY 205 AM CDT... GUSTY WINDS MAY CAUSE SMALL OBJECTS SUCH AS TRASH BINS TO BLOW AROUND. STAY AWAY FROM HIGH OBJECTS OUTDOORS SUCH AS TREES. SEEK SHELTER IN A STURDY STRUCTURE UNTIL THESE STORMS HAVE PASSED. KIECKBUSCH
The Green Bay radar (KGRB), 68 km away, was scanning. The volume nearest the first event began at 06:35 UTC.
3 flash flood, 3 hail, 1 lightning, 1 heavy rain. Local standard time, as filed.
Flash flooding blocked parts of USH-41 south of Oshkosh and SH-21 around Omro, causing authorities to close sections of those highways. Approximately 75 homes sustained basement flooding.
Flash flooding caused authorities to close many roads across Calumet County. The Village of Hilbert sustained the worst flooding, with approximately 100 homes impacted. A flooded creek washed out a section of asphalt on Cemetery Road near Forest Junction and ripped away the culvert. One motorist was injured while attempting to cross the missing section of road during the predawn hours. The driver was hospitalized and the front wheels were torn from the vehicle.
Lightning stuck an electrical box, starting a barn fire that destroyed the barn and a recreational vehicle, and killed 13 show horses.
Flash flooding shut down access to the Town of Rockwood. Three homes sustained basement damage from the flood.
Nickel size hail fell in the Village of Howard.
Nickel size hail fell on the south side of Hancock.
Heavy rainfall from thunderstorms that moved through southern Outagamie County produced urban flooding in the Appleton and Grand Chute areas.
Penny size hail and heavy rain fell in the Town of Grand Chute, northwest of Appleton.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wisconsin in 2012Every state in 2012This day in weather historyWarnings in Wisconsin, May 2012
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: 384195, 384199, 382493, 384204, 382496, 382494, 384775, 382495.