A warm front lifted through southern Wisconsin on the nose of a 30 knot low-level jet. and 40 to 50 knots of deep layer shear supported an MCS as it tracked from northern Iowa across southern Wisconsin during the early morning hours of June 23rd.
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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 warm front lifted through southern Wisconsin on the nose of a 30 knot low-level jet. Good elevated instability...MLCAPE 2000-3000J/kg...and 40 to 50 knots of deep layer shear supported an MCS as it tracked from northern Iowa across southern Wisconsin during the early morning hours of June 23rd. Although the complex weakened as it crossed Wisconsin, it still produced scattered wind damage as well as flash flooding in portions of Jefferson County and northwest Waukesha County.
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, 2:33 AM CST, 12 minutes earlier.
AREA FORECAST DISCUSSION...CORRECTED NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI 333 AM CDT WED JUN 23 2010 FORECAST FOCUS ON SEVERE CONVECTION AND HEAVY RAIN TODAY AND EARLY THIS EVENING. .SHORT TERM...TODAY AND TONIGHT...FORECAST CONFIDENCE MEDIUM. FIRST ROUND OF STRONG TO SEVERE CONVECTION SHIFTING THROUGH AND TOWARD THE FORECAST AREA AT THIS TIME. EXPECT MAINLY A DAMAGING WIND AND FLASH FLOODING RISK WITH THESE STORMS. LOW LEVEL JET POINTING INTO THE AREA COMBINING WITH GOOD ELEVATED INSTABILITY AND 40 TO 50 KNOTS OF DEEP LAYER SHEAR TO DRIVE THE STORMS. FLASH FLOOD WATCH WILL REMAIN IN EFFECT UNTIL NOON FOR MAINLY THE SOUTH HALF OF THE AREA TO ACCOUNT FOR THIS FIRST BATCH OF CONVECTION. THIS ROUND OF CONVECTION SHOULD END FROM WEST TO EAST ACROSS THE AREA BY THE LATE MORNING HOURS. NEXT ROUND OF SEVERE CONVECTION POSSIBLE WITH COLD FRONTAL PASSAGE THIS AFTERNOON INTO EARLY THIS EVENING. AIRMASS SHOULD RECOVER FROM CURRENT CONVECTION...AND ALLOW STRONG INSTABILITY TO DEVELOP. DEEP LAYER SHEAR WILL REMAIN STRONG IN THE 40 TO 50 KNOT RANGE. GFS TOO FAR NORTH WITH FRONTAL BOUNDARY...LIKE THE NAM/ECMWF POSITION BETTER. THIS PLACES THE FRONT NORTHEAST TO SOUTHWEST ACROSS THE FORECAST AREA...WITH THE SOUTHEAST HALF UNDER THE BEST CHANCES FOR SEVERE WEATHER. LARGE HAIL AND DAMAGING WINDS...WITH ISOLATED TORNADOES ARE POSSIBLE. .LONG TERM...THURSDAY THROUGH TUESDAY...FORECAST CONFIDENCE MEDIUM. QUIET WEATHER RETURNS LATER TONIGHT THROUGH FRIDAY...WITH HIGH PRESSURE. THUNDER CHANCES RETURN OVER THE WEEKEND...WITH ANOTHER SYSTEM SHIFTING THROUGH THE REGION. FOR NOW...LEFT CHANCE POPS GOING FOR THE WEEKEND. MODELS DIVERGE IN POSITION AND TIMING OF FEATURES INTO NEXT WEEK...SO KEPT THIS PERIOD MAINLY UNCHANGED. && .AVIATION...FIRST CONCERN ARE CLUSTERS OF THUNDERSTORMS THIS MORNING. EXPECT STRONG WIND GUSTS AND LARGE HAIL WITH STRONGER STORMS...WITH LIFR VSBYS IN HEAVY DOWNPOURS. INITIAL WARM FRONT BANDS WILL AFFECT MAINLY KMSN..KUES AND KMKE...WITH AN EVOLVING BOW ECHO IN NE IOWA EXPECTED TO CROSS SRN WI BETWEEN 09Z AND 13Z AFFECTING ALL TAF SITES WITH SEVERE WIND GUSTS AND IFR/LIFR CONDITIONS. AFTER THIS COMPLEX MOVES THROUGH...LOOKING FOR GUSTY SOUTH TO SOUTHWEST WINDS AHEAD OF COLD FRONT AND THE POTENTIAL OF STRONG TO SEVERE THUNDERSTORMS WITH THE FRONTAL PASSAGE THIS AFTERNOON/EVENING WITH IFR/LIFR CONDITIONS. CIGS/VSBYS IMPROVE TO VFR WITH DRY AIR BEHIND FRONT. && .MARINE...WILL ISSUE A SMALL CRAFT ADVISORY FOR 15Z THROUGH 03Z. MODEL SOUNDINGS INDICATE MIXING UP TO 30+KT WINDS AT AND ABOVE 1000 FT THAT WILL PRODUCE FREQUENT GUSTS ABOVE CRITERIA. WILL ALSO BE DEALING WITH SEVERE THUNDERSTORMS EARLY IN FORECAST PERIOD...WITH DAMAGING WINDS AND LARGE HAIL THE MAIN THREATS WITH CLUSTERS OF THUNDERSTORMS THIS MORNING. ANOTHER CHANCE OF STRONG TO SEVERE THUNDERSTORMS THIS AFTERNOON WITH COLD FRONT PASSAGE...BUT MUCH WILL DEPEND ON SUBSEQUENT POSITION OF BOUNDARIES AND AMOUNT OF RECOVERY AFTER MORNING STORMS. && .MKX WATCHES/WARNINGS/ADVISORIES... WI...FLASH FLOOD WATCH UNTIL NOON CDT TODAY FOR WIZ056-062>072. LM...SMALL CRAFT ADVISORY FROM 10 AM CDT TODAY UNTIL 10 PM CDT TONIGHT FOR LMZ643>646. && SHORT/LONG TERM...08/WOOD AVIATION/MARINE...09/REM CORRECTED TO REMOVE EXTRA HEADER
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI 1032 PM CDT TUE JUN 22 2010 WIZ046-047-051-052-056>060-062>072-240345- MARQUETTE-GREEN LAKE-FOND DU LAC-SHEBOYGAN-SAUK-COLUMBIA-DODGE- WASHINGTON-OZAUKEE-IOWA-DANE-JEFFERSON-WAUKESHA-MILWAUKEE- LAFAYETTE-GREEN-ROCK-WALWORTH-RACINE-KENOSHA- 1032 PM CDT TUE JUN 22 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EAST CENTRAL WISCONSIN...SOUTH CENTRAL WISCONSIN AND SOUTHEAST WISCONSIN. .DAY ONE...TONIGHT THERE IS A MODERATE RISK OF SEVERE THUNDERSTORMS OVERNIGHT IN PARTS OF SOUTH CENTRAL WISCONSIN. A SLIGHT RISK OF SEVERE STORMS SURROUNDS THIS ACROSS THE REST OF SOUTHERN WISCONSIN. STORMS WILL ERUPT WELL WEST OF THE STATE LATE TONIGHT AND THEN RACE EAST INTO SOUTH CENTRAL WISCONSIN EARLY IN THE OVERNIGHT...AND INTO SOUTHEAST WISCONSIN TOWARD DAYBREAK. THE PRIMARY THREAT WILL BE DAMAGING WINDS AND LARGE HAIL...THOUGH HEAVY RAIN IS ALSO POSSIBLE. A FLASH FLOOD WATCH IS IN EFFECT FOR AREAS MAINLY ALONG AND SOUTH OF A LINE FROM THE WISCONSIN DELLS TO MILWAUKEE. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH TUESDAY THERE IS A MODERATE RISK OF SEVERE THUNDERSTORMS ON WEDNESDAY ACROSS MUCH OF SOUTH CENTRAL AND ALL OF SOUTHEAST WISCONSIN. SEVERE THUNDERSTORMS WITH DAMAGING WINDS MAY BE ONGOING DURING THE MORNING. THEN ANOTHER ROUND OF SEVERE THUNDERSTORMS WILL BE POSSIBLE AS A COLD FRONT EXITS SOUTHEAST WISCONSIN DURING THE AFTERNOON. THESE STORMS COULD PRODUCE LARGE HAIL...DAMAGING WINDS AND TORNADOES. A FLASH FLOOD WATCH WILL REMAIN IN EFFECT UNTIL NOON. THERE IS A CHANCE OF THUNDERSTORMS AGAIN SATURDAY AND SUNDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL LIKELY BE NEEDED LATER TONIGHT AND WEDNESDAY. LMZ643>646-240345- 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- 1032 PM CDT TUE JUN 22 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF LAKE MICHIGAN. .DAY ONE...TONIGHT THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS LATE TONIGHT. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH TUESDAY THERE IS A MODERATE RISK OF SEVERE THUNDERSTORMS ON WEDNESDAY. THUNDERSTORMS MAY BE ONGOING DURING THE MORNING. THEN ANOTHER ROUND OF THUNDERSTORMS WILL BE POSSIBLE AS A COLD FRONT EXITS SOUTHEAST WISCONSIN DURING THE AFTERNOON. THERE IS A CHANCE OF THUNDERSTORMS AGAIN SATURDAY AND SUNDAY. REM WWW.WEATHER.GOV/MKX
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI 300 AM CDT WED JUN 23 2010 WIZ058-059-064-065-230845- DODGE-JEFFERSON-WASHINGTON-WAUKESHA- 300 AM CDT WED JUN 23 2010 ...STRONG THUNDERSTORM MOVING INTO NORTHERN WAUKESHA COUNTY... AT 256 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM 8 MILES SOUTHEAST OF WATERTOWN...MOVING EAST AT 35 MPH. PEA SIZE HAIL...FREQUENT CLOUD TO GROUND LIGHTNING...BRIEF HEAVY DOWNPOURS...ARE POSSIBLE WITH THIS STORM. * THE THUNDERSTORM WILL BE NEAR... DELAFIELD AND LAPHAM PEAK STATE PARK BY 320 AM CDT... HARTLAND AND MERTON BY 325 AM CDT... PEWAUKEE BY 330 AM CDT... LANNON BY 340 AM CDT... BROOKFIELD AND ELM GROVE BY 345 AM CDT... STAY AWAY FROM HIGH OBJECTS OUTDOORS SUCH AS TREES. SEEK SHELTER IN A STURDY STRUCTURE UNTIL THIS STORM HAS PASSED. HENTZ
The Milwaukee radar (KMKX), 15 km away, was scanning. The volume nearest the first event began at 08:42 UTC.
3 thunderstorm wind, 2 lightning, 1 hail, 1 flash flood. Local standard time, as filed.
A four-foot in diameter elm tree was blown over as well as several other smaller trees.
Hail size was estimated by a trained spotter.
A lightning strike in the city of Mequon resulted in a fire at a strip mall in the 1100 block of North Port Washington Road that destroyed 9 businesses. Time is estimated. Other severe weather was reported in southern Wisconsin during the pre-dawn hours of June 23, 2010.
Trees reported down by law enforcement in the town of New Diggings.
Lightning struck a telephone line that resulted in an unknown number of customers losing telephone service. Exact location within the city is unknown. Time of event and damage amount are estimated.
Law enforcement reported trees down 1 mile north of Darlington.
Three to five inches of rain fell with a severe thunderstorm complex that crossed southern Wisconsin. Many streets were flooded in Watertown where a measured 3.25 inches of rain fell in 4 hours. Law enforcement officials closed Industrial Road in Ixonia due to flooding. Water depths on some roads reached 1 to 3 feet. A few gravel shoulder washouts on country roads were reported.
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, June 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: 243823, 243828, 244481, 243817, 244476, 243818, 243947.