A complex of thunderstorms developed across south central South Dakota during the pre-dawn hours. These storms continued to move eastward into southwest Minnesota during the morning, and generated an outflow boundary that created thunderstorms across south central and portions of southwest Minnesota prior to noon.
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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 MPX wrote it up.
A complex of thunderstorms developed across south central South Dakota during the pre-dawn hours. These storms continued to move eastward into southwest Minnesota during the morning, and generated an outflow boundary that created thunderstorms across south central and portions of southwest Minnesota prior to noon. Marginal instability and wind shear allowed for a few large hail reports, along with a few wind gusts of 50 to 60 mph. One large hail signature (Three-body Scatter) was noted with strongest early afternoon storm near Mankato, which produced copious amounts of small hail. The combination of the amount of hail, and the wind, crop damage was reported in Nicollet County, east of Nicollet, Minnesota. Eyewitnesses said that one to two foot drifts were noted with the hail swath, which sheared off young corn stocks.
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 Twin Cities, MN wrote its last area forecast discussion before the first event at Jun 1, 5:23 AM CST, 5 hours earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN 623 AM CDT TUE JUN 1 2010 .UPDATE... ADDED 12Z TAF DISCUSSION BELOW. && .DISCUSSION... THE DETAILS OF THE ACTIVE PERIOD AHEAD ARE BECOMING MORE CLEAR EARLY THIS MORNING BUT THE FORECAST IS DEPENDENT ON MORE SUBTLE FEATURES SO CONFIDENCE IS NOT AS HIGH AS IT COULD BE...ESPECIALLY LATER IN THE WEEK. NEAR TERM CONCERN WILL BE SEVERE AND HEAVY RAIN POTENTIAL AS DISCUSSED BELOW. MOISTURE CHANNEL IMAGERY AND EVENING UA ANALYSIS SHOWS A MUCH LESS AMPLIFIED PATTERN OF THE CONUS THAN OVER THE LAST SEVERAL DAYS. HOWEVER...THE FLOW OVER CANADA IS VERY AMPLIFIED WITH A WELL DEFINED OMEGA BLOCK IN PLACE. THE RIDGE AXIS PORTION OF THE BLOCK EXTENDS ALONG THE B.C./ALBERTA BORDER AND WELL NORTHWARD INTO THE ARCTIC. THE CLOSED LOW TO ITS EAST HAS BEEN IN PLACE OVER THE CANADIAN PRAIRIES FOR THE LAST SEVERAL DAYS. A SHORTWAVE IS VISIBLE ROUNDING THE BASE OF THIS LOW AND WILL IMPACT OUR WEATHER TODAY. OTHERWISE...THE FAST WESTERLY AND FAIRLY ZONAL FLOW TO THE SOUTH OF THE BLOCK WILL CONTINUE THROUGH THE WEEK AND SET THE STAGE FOR SEVERAL SMALLER SCALE TROUGHS AND RIDGES TO TRAVERSE IT. OVERALL...MODEL SOLUTIONS HAVE COME INTO BETTER AGREEMENT WITH THE EVOLUTION OF THE MORE SIGNIFICANT FEATURES INTO THE WEEKEND WITH WET AND DRY PERIODS BECOMING MORE CLEAR. SEVERE WEATHER AND HEAVY RAIN THREAT TODAY AND THIS EVENING WILL BE THE MAIN FOCUS. AFOREMENTIONED SHORTWAVE ROUNDING THE SOUTHERN PERIPHERY OF THE CLOSED UPPER LOW OVER MANITOBA WILL HELP PUSH A SFC COOL FRONTAL BOUNDARY SOUTHWARD ACROSS THE CWA TODAY WITH ANOTHER WAVE CURRENTLY OVER THE WESTERN U.S. CROSSING THE AREA LATER ON TODAY. WARM AND MOIST ASCENT ACROSS CENTRAL AND NORTHERN MN ALONG WITH ELEVATED INSTABILITY CONTINUES TO GENERATE SCATTERED SHOWERS AND THUNDERSTORMS EARLY THIS MORNING. THIS ACTIVITY LOOKS TO CONTINUE AND WILL BECOME MORE NUMEROUS ACROSS EASTERN SOUTH DAKOTA AND CENTRAL MN THROUGH THE LATE MORNING HOURS AS THE FRONT PUSHES SOUTH. INSTABILITY WILL GROW ACROSS SOUTHERN MN INTO EARLY AFTERNOON WITH MODERATE DEEP LAYER SHEAR ACROSS THE AREA. BETWEEN THE FRONT... THE ARRIVAL OF THE SHORTWAVE FROM THE WEST...AND THE ARRIVAL OF THE RIGHT REAR QUADRANT OF A 100 KT UPPER JET...THERE SHOULD BE PLENTY OF SHRA/TSRA DEVELOPMENT ACROSS THE AREA BY MID AFTERNOON. EXPECT THAT WESTERN AREAS WILL SEE AN INCREASE IN COVERAGE LATE THIS MORNING AS THE FRONT SAGS SOUTH WITH AN EXPANSION IN COVERAGE ALONG THE FRONT ACROSS MUCH OF THE AREA BY MID AFTERNOON AS THE FRONT...THE UPPER SHORTWAVE...AND THE INCREASING INSTABILITY ALL INTERSECT. INSTABILITY AND SHEAR PARAMETERS SUPPORT ORGANIZED CLUSTERS OF STORMS WITH DAMAGING WINDS AND LARGE HAIL BEING THE MAIN SEVERE THREATS...ESPECIALLY ACROSS THE CENTRAL AND SOUTHERN CWA. HEAVY RAIN WILL ALSO BE A THREAT WITH PRECIPITABLE WATER VALUES QUICKLY INCREASING TO AROUND 1.5/1.6 INCHES. STORMS SHOULD TRAIN IN A GENERAL WEST TO EAST DIRECTION WHICH WILL INCREASE RESIDENCE TIME OVER ANY GIVEN AREA BUT THE SOUTHWARD PROGRESSION OF THE FRONT SHOULD KEEP THE SOUTHWARD PROGRESSION OF THE ACTIVITY STEADY. NEVER THE LESS...HIGH RAINFALL RATES MAY LEAD TO ISOLATED PONDING/FLOODING. 1 HR FLASH FLOOD GUIDANCE VALUES ARE MOSTLY IN THE 3 TO 3.5 INCH RANGE THOUGH THERE ARE A FEW COUNTIES THAT ARE AROUND 2.5 INCHES SCATTERED AROUND THE AREA...NAMELY THE LE SUER/RICE/STEELE AREA IN SOUTH CNTRL MN...WHICH IS WHERE THE BEST CHANCE FOR HEAVY RAIN EXISTS. ACTIVITY IS EXPECTED TO CONTINUE INTO TONIGHT BEFORE WANING EARLY WEDNESDAY MORNING. HIGH PRESSURE WILL BUILD IN DURING THE DAY WEDNESDAY WITH NORTHERLY SFC FLOW ACROSS THE AREA. ANOTHER SHORTWAVE WILL APPROACH IN THE CONTINUED WESTERLY UPPER FLOW SO LOW POPS ARE WARRANTED ACROSS THE SOUTH DESPITE THE PRESENCE OF HIGH PRESSURE. COOLER AIR WILL BE IN PLACE AS WELL WITH NORTHERN AREAS LIKELY STRUGGLING TO REACH 70 WITH LOW TO MID 70S SOUTH. THE HIGH WILL SLIDE TO THE EAST INTO THURSDAY WITH SHORTWAVE RIDGING APPROACHING FROM THE WEST THURSDAY AFTERNOON. MID LEVEL WARM ADVECTION ALONG WITH A SHORTWAVE WILL CROSS THE AREA THURSDAY INTO FRIDAY. A SFC LOW WILL BE MOVING ACROSS THE CANADIAN PRAIRIES AS WELL WITH A COLD FRONT EXTENDING SOUTHWARD WHICH WILL ALSO CROSS THE AREA. THE GFS IS FASTER WITH THE PROGRESSION OF FEATURES THAN THE NAM AND ECMWF WHICH IS NOT AN UNREASONABLE SOLUTION BUT WILL GO AHEAD AND KEEP THE FORECAST FOR THURSDAY DRY BUT INTRODUCE POPS FROM WEST TO EAST THURSDAY EVENING/NIGHT AS THE WAA...WAVE...AND FRONT APPROACH. THERE LOOKS TO BE A BRIEF RESPITE FROM SHRA/TSRA LATER FRIDAY OR FRIDAY NIGHT BUT ANOTHER SYSTEM LOOKS TO BRING MORE SHRA/TSRA CHANCES SATURDAY INTO SUNDAY. HIGHS FROM THURSDAY ONWARD WILL GENERALLY BE IN THE 70S. ..MDB.. && .AVIATION.../12Z TAF ISSUANCE/ GENERALLY VFR CIG CONDITIONS EXPECTED ON AVERAGE EXCEPT IN DEVELOPING SHOWERS AND THUNDERSTORMS FROM KRWF TO KRNH ON TO THE SOUTH. THERE MAY ALSO BE A PERIOD OF MVFR CIGS FOR A SHORT TIME BEHIND THE COLD FRONT MAINLY S OF A LINE FROM KRWF TO KMSP TO KRNH. MID TO HIGH LEVEL CIGS INTO LATE MORNING OR NOON. INCREASING INSTABILITY ADVECTION AHEAD OF THE SE MVG COLD FRONT WILL THEN CAUSE SCT SHOWERS TO DEVELOP OVER MN. THE GREATER RISK OF THUNDERSTORMS WILL BEGIN IN THE 20-21Z TIME FRAME...ESPECIALLY KRWF TO KMSP TO KRNH. A LESSER CHANCE FOR KSTC. THE THREAT MOVES TO KEAU AFTER 22Z. VSBYS COULD GO DOWN TO 3-4SM IN SHOWERS AND THUNDERSTORMS WITH JUST ABOVE MVFR CIGS. THE THREAT OF THUNDER WILL DECREASE AFTER 01Z BUT WITH SHOWERS LINGERING UNTIL 04Z. CLEARING TOWARD THE END OF THE TAF PERIOD MOST AREAS. WINDS TO REMAIN LIGHT BUT A FEW SW GUSTS OVER SOUTH CENTRAL MN. WIND TURNING TO NNE BEHIND THE COLD FRONT. KMSP....VFR FOR THE ENTIRE PERIOD EXCEPT FOR THE TIME PERIOD OF GREATEST RISK OF SHOWERS AND THUNDERSTORMS. VSBYS EXPECTED TO DROP TO MVFR IN SHOWERS...BUT WILL NEED TO WATCH FOR ANY TRAINING OF CONVECTION WHICH COULD LOWER CIGS TO MVFR. OTHERWISE THERE MAY BE A BRIEF PERIOD OF MVFR CIGS BEHIND THE FRONT. SSW WIND DIRECTION A LITTLE PROBLEMATIC FOR THE RUNWAYS AHEAD OF THE FRONT. WIND SWITCHING TO NNE BEHIND THE COOL FRONT. && .MPX WATCHES/WARNINGS/ADVISORIES... MN...NONE. WI...NONE. && MDB/JPR
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN 405 AM CDT TUE JUN 1 2010 MNZ041>045-047>070-073>078-082>085-091>093-WIZ014>016-023>028- 020915- DOUGLAS-TODD-MORRISON-MILLE LACS-KANABEC-STEVENS-POPE-STEARNS- BENTON-SHERBURNE-ISANTI-CHISAGO-LAC QUI PARLE-SWIFT-CHIPPEWA- KANDIYOHI-MEEKER-WRIGHT-HENNEPIN-ANOKA-RAMSEY-WASHINGTON- YELLOW MEDICINE-RENVILLE-MCLEOD-SIBLEY-CARVER-SCOTT-DAKOTA- REDWOOD-BROWN-NICOLLET-LE SUEUR-RICE-GOODHUE-WATONWAN-BLUE EARTH- WASECA-STEELE-MARTIN-FARIBAULT-FREEBORN-POLK-BARRON-RUSK- ST. CROIX-PIERCE-DUNN-PEPIN-EAU CLAIRE- 405 AM CDT TUE JUN 1 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL AND SOUTHERN MINNESOTA...AND WEST CENTRAL WISCONSIN. .DAY ONE...TODAY AND TONIGHT STRONG TO SEVERE THUNDERSTORMS ARE LIKELY FOR MUCH OF THE OUTLOOK AREA THIS AFTERNOON AND THIS EVENING...ESPECIALLY ACROSS SOUTH CENTRAL MINNESOTA. THE MAIN SEVERE THREATS WILL BE LARGE HAIL AND DAMAGING WINDS. HEAVY RAINFALL WILL ALSO BE POSSIBLE WITH ANY THUNDERSTORM WHICH MAY LEAD TO PONDING OF WATER AND ISOLATED FLOODING. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY THUNDERSTORMS WILL AGAIN BE POSSIBLE FROM THURSDAY NIGHT INTO THE WEEKEND. .SPOTTER INFORMATION STATEMENT... SKYWARN SPOTTER ACTIVATION WILL LIKELY BE NEEDED THIS AFTERNOON AND THIS EVENING ACROSS SOUTH CENTRAL MINNESOTA AND SOUTHERN PORTIONS OF WEST CENTRAL WISCONSIN. MDB
The Minneapolis radar (KMPX), 93 km away, was scanning. The volume nearest the first event began at 16:22 UTC.
5 thunderstorm wind, 4 hail, 2 funnel cloud. Local standard time, as filed.
The public reported mostly one-quarter inch hail that fell just south of New Ulm, but a few nickel size fell prior to the hail ending east of town.
The combination of loads of small hail, and strong winds caused crop damage east of Nicollet, Minnesota.
Several reports of quarter size hail occurred along Highway 169, north of Mankato, Minnesota, with drifts up to two feet reported along the road side.
Several trees were blown down in the City of Fairmont due to severe thunderstorm wind gusts.
The City of Granada had a flag pole bent in half due to severe thunderstorm wind gusts.
Several large tree branches were blown down, and caused a garage roof to be damaged in the city of Blue Earth, Minnesota.
A trained spotter noted a wall cloud approximately five miles southeast of Kasota that briefly produced a funnel cloud as the storm moved southeast across southern Le Sueur County.
A spotter reported a brief funnel cloud.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Minnesota in 2010Every state in 2010This day in weather historyWarnings in Minnesota, 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: 223117, 223085, 223088, 223087, 223091, 223090, 223089, 223092, 223086, 223668, 223084.