A single isolated cell developed quickly in the Edgerton area of north-central Rock County, moved east-southeast, and produced a weak landspout-type tornado and wind damage northwest of the Milton area.
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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 single isolated cell developed quickly in the Edgerton area of north-central Rock County, moved east-southeast, and produced a weak landspout-type tornado and wind damage northwest of the Milton area.
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 Jun 23, 2:05 PM CST, 5 hours 2 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI 305 PM CDT TUE JUN 23 2009 .SHORT TERM /TONIGHT THROUGH FRIDAY/... WILL LET HEAT ADVISORY RUN ITS COURSE THROUGH 00Z/24. FORTUNATELY...WINDS HAVE REMAINED MOSTLY 6KTS OR LESS WHICH HAS PREVENTED DRIER AIR ALOFT FROM MIXING DOWN TO SURFACE ACROSS WIDESPREAD AREA...HOWEVER DEWPOINTS IN A FEW SPOTS HAVE DROPPED BACK INTO THE 60S. CONSIDERED ANOTHER ADVISORY FOR WEDNESDAY ESPECIALLY IN MY MORE POPULOUS SOUTHEAST AREA. HOWEVER WILL AGAIN BE BORDERLINE EVENT...AND AM EXPECTING SLIGHTLY MORE MIXING IN THE BOUNDARY LAYERS WHICH WOULD RESULT IN A MORE WIDESPREAD DROP IN DEWPOINT. HOWEVER THIS COULD BE COUNTERED BY ADVECTION OF HIGHER DEWPOINTS FROM THE SOUTH. 85H TEMPS COOL 1-2 DEGREES AS WELL. HENCE WL LET EVENING/MIDNIGHT SHIFT REEVALUATE FOR POTENTIAL HEAT ADVISORY FOR WED. SQUALL LINE RACING ACROSS IA/MN MOVING EAST AT 35 MPH MAY REACH FAR WESTERN CWA BETWEEN 00-02Z IF IT HOLDS TOGETHER. CONVECTION IS MOVING INTO A VERY UNSTABLE AIR MASS WITH SBCAPES AROUND 3000 J/KG AND NO CIN. CORFIDI VECTORS FAVOR THIS COMPLEX TAKING A TURN TO THE SOUTHEAST THROUGH LATE AFTERNOON...BUT NORTHERN EDGE WILL BE TO CLOSE FOR COMFORT TO MY FAR WEST. MCS MAINTENANCE GREATER THAN 75 PERCENT IN WESTERN IOWA...BUT REMAINING VERY LOW IN FAR EASTERN IOWA INTO WISCONSIN. LATEST 3KM WRF CONVECTION MODEL DOES CARRY WEAKENING SQUALL LINE INTO WRN CWA THIS EVENING. SLIGHT RISK JUST EXPANDED TO INCLUDE ALMOST ENTIRE CWA BUT THINKING CONVECTION WILL WEAKEN AND DIMINISH DURING THE EVENING. LAPSE RATES ARE STEEPENING. WL ADD SCT WORDING TO MY FAR WEST...TAPERING OFF TO SCHC WEST OF MKE THIS EVENING. MAIN SVR THREAT WILL BE WIND DUE TO HIGH FREEZING LEVELS. ENHANCED FORCING FROM RIGHT ENTRANCE REGION MOVING ACROSS SOUTHERN WISCONSIN LATER WEDNESDAY INTO WEDNESDAY EVENING...SO EXPECTING MORE WIDESPREAD ROUND OF THUNDERSTORMS DURING THIS PERIOD AS LOW LEVEL CONVERGENCE ASSOCIATED WITH WEAK FRONTAL BOUNDARY MOVES ACROSS AREA. SHEAR REMAINS MINIMAL DURING THIS PERIOD BUT CAPE INCREASES TO 3000 J/KG. COULD NOT RULE OUT ISOLATED SEVERE AS FREEZING LEVEL DECREASES LATER WEDNESDAY. SMALL THREAT CONTINUES ACROSS SOUTH THU MORNING...OTHERWISE DRIER AIR SLIDES SOUTH ACROSS CWA THU FOR FRI. .LONG TERM /FRIDAY NIGHT THROUGH TUESDAY/... GOOD AGREEMENT BETWEEN HI RES ECMWF AND GFS CONTINUES...AT LEAST THROUGH THE FIRST PORTION OF THE EXTENDED PERIOD. SECOND SHORT WAVE TROUGH OF THE FORECAST PERIOD AND FAIRLY STRONG COOL FRONT SWEEPS THROUGH SOUTHERN WISCONSIN ON SATURDAY. SHEAR LOOKS IMPRESSIVE ON SATURDAY BUT QUESTION AS TO AMOUNT OF INSTABILITY AVAILABLE. SATURDAY EVENING FESTIVITIES MAY BE THREATENED FROM CONVECTION BEFORE RIDGING AND DRY WEATHER RETURNS OVERNIGHT SATURDAY...AND LINGERS THROUGH THE REST OF THE WEEKEND AND INTO EARLY NEXT WEEK. LARGE DIFFERENCES APPEAR WITH REGARDS TO THE UPPER LEVEL FEATURES EARLY NEXT WEEK ACROSS NRN CONUS INTO SRN CANADA...HENCE CONFIDENCE DECREASES. ECMWF SHOWING INCREASING AMPLITUDE TO LONG WAVE TROUGH OVER ERN GTLAKES/NERN CONUS AND LINGERS TROUGH INTO MID WEEK...WHILE GFS FOCUSES MORE ON AMPLIFYING COLD CORE LOW OVER SOUTH CENTRAL CANADA. CONSIDERING BOTH MODELS SHOWING LITTLE AGREEMENT OR RUN TO RUN CONTINUITY...WL CONTINUE WITH DRY FORECAST AT THIS POINT. ENUF CONFIDENCE HOWEVER IN INCREASING NWLY WINDS USHERING IN COOLER 85H TEMPS. HENCE LOWERED TEMPS SLIGHTLY SUN THRU TUE. STILL LOOKS PLEASANT AND SEASONAL...WITH LAKE BREEZE COOLING NEXT TO LAKE MICHIGAN. && .AVIATION...A SYSTEM CURRENTLY IN IOWA WILL MOVE WEST TOWARD WISCONSIN THIS EVENING. MONITORING THUNDERSTORMS CURRENTLY IN NORTHERN IOWA FOR THE SLIGHT CHANCE THAT THESE COULD REACH MADISON THIS EVENING. POTENTIAL FOR FOG IN THE EARLY MORNING HOURS ONCE AGAIN EARLY THURSDAY MORNING. EXPECT IFR CONDITIONS OR HIGHER IN THE WEST...MVFR EAST. ANOTHER SYSTEM PASSING WISCONSIN TOMORROW WILL BRING HIGH TO MID LEVEL CLOUDS THROUGH THE DAY. CHANCES FOR THUNDERSTORMS INCREASE TOMORROW AFTERNOON INTO THE EVENING. && .MARINE...LOOKING FOR PATCHY FOG OR HAZE VERSUS WIDESPREAD FOG ONCE AGAIN OVER THE LAKE SHORE WATERS TONIGHT AS COOLER LAKE AIR OFFSET BY LOWER DEW POINTS ADVECTING IN FROM THE EAST AROUND SURFACE HIGH PRESSURE OVER LOWER MI AND THE EASTERN GREAT LAKES. && .MKX WATCHES/WARNINGS/ADVISORIES... WI...HEAT ADVISORY UNTIL 7 PM CDT THIS EVENING FOR WIZ046-047-051-056>059-062>065-067>070. LM...NONE. && SHORT/LONG TERM...MBK AVIATION/MARINE...PZ/MRC
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI 705 PM CDT TUE JUN 23 2009 WIZ046-047-051-052-056>060-062>072-241100- MARQUETTE-GREEN LAKE-FOND DU LAC-SHEBOYGAN-SAUK-COLUMBIA-DODGE- WASHINGTON-OZAUKEE-IOWA-DANE-JEFFERSON-WAUKESHA-MILWAUKEE- LAFAYETTE-GREEN-ROCK-WALWORTH-RACINE-KENOSHA- 705 PM CDT TUE JUN 23 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EAST CENTRAL WISCONSIN...SOUTH CENTRAL WISCONSIN AND SOUTHEAST WISCONSIN. .DAY ONE...TONIGHT HEAT INDEX VALUES WILL FALL THROUGH THE 90S THIS EVENING. THE WISCONSIN DEPARTMENT OF NATURAL RESOURCES HAS ISSUED AN AIR QUALITY ADVISORY FOR OZONE FOR SHEBOYGAN...OZAUKEE...MILWAUKEE... RACINE...AND KENOSHA COUNTIES UNTIL 10 PM WEDNESDAY. AN AIR QUALITY WATCH REMAINS IN EFFECT FOR THE REMAINDER OF SOUTHEAST WISCONSIN UNTIL MIDNIGHT. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY HEAT INDEX VALUES WEDNESDAY AFTERNOON SHOULD REACH FROM 93 TO 97 ACROSS MOST OF SOUTH CENTRAL AND SOUTHEAST WISCONSIN INLAND FROM LAKE MICHIGAN. THERE IS A CHANCE OF THUNDERSTORMS WEDNESDAY THROUGH WEDNESDAY NIGHT...AND AGAIN FRIDAY NIGHT THROUGH SATURDAY NIGHT. AN AIR QUALITY ADVISORY REMAINS IN EFFECT FOR THE LAKESHORE COUNTIES UNTIL 10 PM WEDNESDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED TONIGHT. LMZ643>646-241100- 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- 705 PM CDT TUE JUN 23 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF LAKE MICHIGAN. .DAY ONE...TONIGHT PATCHY FOG IS EXPECTED TO DEVELOP TONIGHT. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY THERE IS A CHANCE OF THUNDERSTORMS WEDNESDAY THROUGH WEDNESDAY NIGHT...AND AGAIN FRIDAY NIGHT THROUGH SATURDAY NIGHT. BORGHOFF WWW.WEATHER.GOV/MKX
The Milwaukee radar (KMKX), 40 km away, was scanning. The volume nearest the first event began at 01:06 UTC.
1 thunderstorm wind, 1 tornado. Local standard time, as filed.
Powerful thunderstorm winds toppled several trees and tree debris brought down a couple power-lines.
An isolated thunderstorm cell quickly developed and spun up a weak landspout-type tornado that was spotted by the Janesville airport observer, trained spotters and the public. It began over the southwest part of Clear Lake and moved east-southeast and ended just east of STH 59. A screen porch was ripped off a mobile home trailer and some trees just south and southeast of Clear Lake were uprooted or damaged. The estimated max wind speeds of were 70-75 mph. Starting and ending location of 42.79879/-88.98358 and 42.79540/-88.96750. The compass bearing was 117 degrees. The average path width was about 15 yds. DI#3, DOD2.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wisconsin in 2009Every state in 2009This day in weather historyThe tornado archive for Wisconsin, 2009Warnings in Wisconsin, June 2009
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: 177277, 177278.