Strong southwest winds, gusting to an estimated 43 knots (50 mph) pushed a motorcycle over at the intersection on Interstate 39/90 and Hart Rd. The diver was injured, and his cycle sustained minor damage.
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The episode as NWS MKX wrote it up.
Strong southwest winds, gusting to an estimated 43 knots (50 mph) pushed a motorcycle over at the intersection on Interstate 39/90 and Hart Rd. The diver was injured, and his cycle sustained minor damage. This occurred about 4 miles northeast of Beloit. The winds about 5000 feet above ground level were about 40 to 50 knots at the time of the accident. Daytime heating and mixing of the lower atmosphere allowed some of the higher momentum air to mix down to the surface.
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 2, 3:12 AM CST, 5 hours 48 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI 412 AM CDT FRI APR 2 2010 .SYNOPSIS... WV IMAGERY AND RUC ANALYSIS SHOW TROUGH OVER INTERMOUNTAIN WEST AND RIDGE OVER SOUTHEAST U.S. THIS MORNING. THE INFLECTION POINT OVER THE PLAINS AND UPPER MIDWEST WILL BE THE FOCAL AREA FOR THE UPCOMING SYSTEM. THERE IS A STEADY STREAM OF MIDDLE TO UPPER LEVEL MOISTURE AND CIRRUS CLOUDS IN THIS AREA AT THIS TIME. && .SHORT TERM... TODAY...FORECAST CONFIDENCE...HIGH. APPROACHING LOW PRESSURE FROM THE PLAINS WILL BRING ANOTHER WARM AND BREEZY DAY. TODAY WILL BE SIMILAR TO YESTERDAY...EXCEPT FOR A THICKER HIGH CLOUD COVER AND MAYBE SLIGHTLY COOLER TEMPS BECAUSE OF IT. THE MORNING WILL START OUT WITH FAIRLY LIGHT WINDS AND OCCASIONAL GUSTS...BUT RIGHT AROUND 15Z THE WINDS WILL PICK UP AS THE STRONG WINDS JUST ABOVE THE SFC MIX DOWN. THE 850MB LOW LEVEL JET WILL BE FOCUSED OVERHEAD TODAY...WITH WINDS IN EXCESS OF 40 TO 50 KT. HOWEVER...WITH VERY WARM 850MB TEMPS...THE ENVIRONMENT IS WELL CAPPED AND WE SHOULD ONLY MIX UP TO AROUND 900MB OR SO. 925MB TEMPS WILL BE AROUND 17C TO 18C BY LATE AFTERNOON...WHICH WOULD BE AROUND 78F TO 80F. THE LAKE BREEZE WILL MAKE THE MKE TEMP VERY UNCERTAIN. WENT WITH A HIGH AROUND 80 TO ACCOUNT FOR A LATE LAKE BREEZE ARRIVAL SINCE WINDS ARE GOING STRONG OUT OF THE SOUTHWEST EARLY THIS MORNING. TONIGHT THROUGH SUNDAY...FORECAST CONFIDENCE...MEDIUM. LOW PRESSURE OVER NORTHERN MINNESOTA WILL MOVE NORTH NORTHEAST INTO ONTARIO CANADA...PULLING A COLD/OCCLUDED FRONT INTO WESTERN WISCONSIN TONIGHT...AND ACROSS THE REST OF THE REGION ON SATURDAY. MODELS ALSO SHOW A RATHER STRONG SHORTWAVE TROUGH SHIFTING NORTHEAST TROUGH THE REGION SATURDAY AFTERNOON AND SATURDAY EVENING. THE NAM IS A LITTLE SLOWER WITH THE ONSET OF THE PRECIPITATION AND FROPA THAN THE GFS...DELAYING THE PRECIPITATION UNTIL SATURDAY OVER THE SOUTHEAST. WITH DRIER AIR IN PLACE AHEAD OF THIS SYSTEM...THE SLOWER MOVEMENT MAY BE BETTER. WENT WITH CATEGORICAL POPS OVER THE WEST AFTER 06Z TONIGHT GIVEN THE STRONG SYNOPTIC UPWARD VERTICAL MOTION EXPECTED AND THE RESULTING SATURATION. SPREAD LIKELY POPS OVER THE EAST ON SAT MORNING. SOME WEAK INSTABILITY ALOFT IS SEEN IN FORECAST SOUNDINGS FOR TONIGHT INTO SATURDAY...SO KEPT THE ISOLATED THUNDER MENTION WITH THE HIGHER POPS. MODELS SHOW ALL PRECIP CLEARED OUT OF THE STATE RIGHT BEHIND THE FRONT BY 00Z SUN. WAS CONSERVATIVE WITH CLEARING THE PRECIP TO KEEP GOOD COLLABORATION. SHORTWAVE CROSSING THE UPPER MIDWEST...IN COMBINATION WITH THE LEFT EXIT REGION OF THE JET...SHOULD BRING MORE SHOWERS TO MAINLY NORTHERN WI SAT NIGHT. KEPT SCHC MENTION...BUT DO NOT THINK THAT IT WILL AFFECT THE CWA. .LONG TERM... SUNDAY AND SUNDAY NIGHT...FORECAST CONFIDENCE...MEDIUM. CONTINUED TO KEEP SUNDAY DRY...HOWEVER A WEAK WAVE COULD BRING SOME SHOWERS...BUT FORCING IS WEAK AND AND MOISTURE WILL BE LIMITED. MONDAY THROUGH TUESDAY...FORECAST CONFIDENCE...LOW. ECMWF AND GFS HAVE DIFFERENT SOLUTIONS IN THE EXTENDED DUE TO SUBTLE UPPER LEVEL FEATURE DIFFERENCES. ECMWF SHOWS QPF OVER CWA ASSOCIATED WITH WEAK SHORTWAVE CROSSING THE REGION. THE GFS STAYS DRY. THE GFS IS QUICKER THAN THE ECMWF WITH LOW PRESSURE MOVING NORTHEAST FROM THE CENTRAL PLAINS INTO NORTHERN IOWA MON NIGHT OR TUE MORNING. THE LOW BRINGS A STRONG WARM FRONT INTO THE AREA...WITH THE LOW SHIFTING NORTHEAST INTO WISCONSIN ON TUESDAY. THEREFORE...DID NOT MAKE ANY MAJOR CHANGES TO THIS PERIOD EXCEPT EXPANDED AREA OF LIKELY POPS ON TUE MORNING. TEMPERATURES WILL HIGHLY DEPENDED ON WHETHER WE GET INTO WARM SECTOR OF MIDWEEK LOW. && .AVIATION...LOW LEVEL WIND SHEAR THE MAIN PROBLEM EARLY IN THE FORECAST WITH AREA PROFILERS SHOWING 45 TO 50 KT SSWLY WINDS AT 925MB. MIXING AFTER 15Z WILL INCREASE SRLY SFC WINDS TO 15 TO 25 KNOTS...WHILE WINDS AT OR BELOW 2000 FT LOWER TO 30 TO 35 KNOTS. WHILE SOME MODELS BRINGING PCPN EARLIER...WILL TIE RAIN INTO THE TAF SITES WITH BETTER FRONTOGENETIC FORCING FROM WEST TO EAST BETWEEN 06Z AND 12Z SAT. BASED ON UPSTREAM OBS...WILL KEEP CIGS AND VSBYS NO LOWER THAN MVFR WITH PCPN FOR NOW. && .MARINE...S-SELY WINDS WILL CONTINUE INTO LATE THIS EVENING AS STRONG LOW PRESSURE SLOWLY MOVES FROM EASTERN SOUTH DAKOTA TO MN TODAY. THE PRESSURE GRADIENT WILL RELAX LATE TONIGHT INTO SATURDAY MORNING AS A TRAILING TROUGH OF LOW PRESSURE CROSSES THE REGION AS THE LOW MOVES INTO WRN ONTARIO CANADA FOR SAT. WITH NEARSHORE OBS SITES ALREADY GUSTING FREQUENTLY TO SMALL CRAFT ADVISORY LEVELS...AND EXPECTED TO CONTINUE THROUGH THE BALANCE OF THE DAY...HAVE ISSUED A SMALL CRAFT ADVISORY UNTIL 12 SAT. EXPECT THE ADVISORY CRITERIA WINDS AND WAVES MAINLY WITHIN THE FIRST MILE OR SO OF THE NEARSHORE WATERS...WITH SUSTAINED WINDS TO REMAIN AROUND 15 KTS WITH FREQUENT GUSTS TO 25 KNOTS...AND WAVES RANGING FROM 3-5 FEET. THE STABLE CONDITIONS FARTHER OUT OVER LAKE MI WILL LIMIT THE MIXING OF HIGHER WINDS TO THE SFC. && .FIRE WEATHER...CYCLOGENESIS FROM THE CENTRAL PLAINS INTO MN TODAY WILL CONTINUE TO SUPPORT WINDY AND WARM CONDITIONS. BREEZY AND VERY GUSTY SLY WINDS ARE EXPECTED ONCE AGAIN BY LATE THIS AM OR EARLY AFTERNOON WITH WIND GUSTS AROUND 27 KTS. LOW RELATIVE HUMIDITY IS ONCE AGAIN EXPECTED WITH RHS IN THE 30 TO 40 PERCENT RANGE. THEREFORE...GIVEN THE DRY FUEL CONDITIONS...CRITICAL FIRE WX CONDITIONS STILL EXIST FOR LATE THIS MORNING THROUGH EARLY THIS EVENING. && .MKX WATCHES/WARNINGS/ADVISORIES... WI...NONE. LM...SMALL CRAFT ADVISORY UNTIL 7 AM CDT SATURDAY FOR LMZ643>646. && SHORT/LONG TERM...13/MRC AVIATION/MARINE...09/REM
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI 553 AM CDT FRI APR 2 2010 WIZ046-047-051-052-056>060-062>072-031100- MARQUETTE-GREEN LAKE-FOND DU LAC-SHEBOYGAN-SAUK-COLUMBIA-DODGE- WASHINGTON-OZAUKEE-IOWA-DANE-JEFFERSON-WAUKESHA-MILWAUKEE- LAFAYETTE-GREEN-ROCK-WALWORTH-RACINE-KENOSHA- 553 AM CDT FRI APR 2 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EAST CENTRAL WISCONSIN...SOUTH CENTRAL WISCONSIN AND SOUTHEAST WISCONSIN. .DAY ONE...TODAY AND TONIGHT WARM AND WINDY CONDITIONS WILL CONTINUE TODAY...WITH NEAR CRITICAL FIRE WEATHER CONDITIONS INTO EARLY THIS EVENING AS SOUTH WINDS GUST TO 30 MPH. RELATIVE HUMIDITY VALUES WILL BE A LITTLE HIGHER THAN PREVIOUS DAYS...RANGING BETWEEN 30 AND 35 PERCENT. AGGRESSIVE FIRE BEHAVIOR CAN BE EXPECTED WITH ANY FIRE STARTS. ISOLATED THUNDERSTORMS ARE POSSIBLE TONIGHT...MAINLY WEST OF A FOND DU LAC TO DELAVAN LINE. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY ISOLATED THUNDERSTORMS ARE POSSIBLE SATURDAY...WITH A BETTER CHANCE FOR THUNDERSTORMS FROM MONDAY NIGHT THROUGH WEDNESDAY NIGHT. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED. LMZ643>646-031100- SHEBOYGAN TO PORT WASHINGTON WI- PORT WASHINGTON TO NORTH POINT LIGHT WI- NORTH POINT LIGHT TO WIND POINT WI- WIND POINT WI TO WINTHROP HARBOR IL- 553 AM CDT FRI APR 2 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF LAKE MICHIGAN. .DAY ONE...TODAY AND TONIGHT A SMALL CRAFT ADVISORY IS IN EFFECT THROUGH TONIGHT. SOUTH WINDS FREQUENTLY GUSTING TO 25 KNOTS OR BETTER WITHIN A MILE OR SO OF SHORE WILL BUILD WAVES OF 3 TO 5 FEET. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY A SMALL CRAFT ADVISORY IS IN EFFECT UNTIL EARLY SATURDAY MORNING. SOUTH WINDS WILL EASE AND VEER WEST EARLY SATURDAY...WITH WAVES SUBSIDING BELOW SMALL CRAFT ADVISORY LEVELS EARLY SATURDAY MORNING. WINDS AND WAVES WILL APPROACH SMALL CRAFT ADVISORY CRITERIA AT TIMES FROM TUESDAY THROUGH THURSDAY. ISOLATED THUNDERSTORMS ARE POSSIBLE SATURDAY...WITH A BETTER CHANCE FOR THUNDERSTORMS MONDAY NIGHT THROUGH WEDNESDAY NIGHT. REM WWW.WEATHER.GOV/MKX
The national radar mosaic for the moment the first event began.
1 strong wind. Local standard time, as filed.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wisconsin in 2010Every state in 2010This day in weather historyWarnings in Wisconsin, April 2010
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: 228127.