A cold front triggered a line of thunderstorms during the evening hours on September 24th. An isolated severe storm produced wind gusts up to 60 mph in Dodge County, MN but there were numerous other reports of 45 to 52 mph wind gusts across southeast Minnesota.
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 ARX wrote it up.
A cold front triggered a line of thunderstorms during the evening hours on September 24th. An isolated severe storm produced wind gusts up to 60 mph in Dodge County, MN but there were numerous other reports of 45 to 52 mph wind gusts across southeast Minnesota. The public reported a couple of out-buildings and some trees blown down on a farm, as well as the roof blown off a barn.
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 La Crosse, WI wrote its last area forecast discussion before the first event at Sep 24, 1:35 PM CST, 3 hours 48 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE LA CROSSE WI 235 PM CDT MON SEP 24 2007 .SHORT TERM...THROUGH THURSDAY NIGHT FORECAST CONCERNS WERE PRIMARILY FOCUSED ON RAIN CHANCES THROUGH TUESDAY EVENING...ALONG WITH SEVERE WEATHER POTENTIAL THIS EVENING. AFTERNOON SURFACE ANALYSIS HAD COLD FRONT EXTENDING FROM NORTHEAST TO SOUTHWEST MN AND INTO EASTERN NEBRASKA. AXIS OF LOW LEVEL THETA-E CONVERGENCE AND SBCAPE VALUES OF 1000-2000J/KG ALONG AND AHEAD OF FRONT TRIGGERING LINE OF CONVECTION IN CENTRAL AND SOUTHWEST MN. SCATTERED CONVECTION ALSO OCCURRING ACROSS PARTS OF SOUTHEAST MN AND NORTHEAST IOWA. WATER VAPOR IMAGERY INDICATED MID LEVEL CIRCULATION DIGGING ACROSS CENTRAL ROCKIES...WHILE TWO DISTINCT PLUMES OF MID LEVEL MOISTURE BEING PULLED NORTHWARD INTO THE UPPER MISSISSIPPI VALLEY AHEAD OF THIS FEATURE. GOES SOUNDER PRECIPITABLE WATER VALUES IN THESE PLUMES WAS GENERALLY AROUND 1.5 INCHES. 12Z 24SEP07 DETERMINISTIC MODELS WERE SIMILAR IN THEIR SOLUTIONS WITH REGARD TO DETAILS OF FRONT MOVING THROUGH TONIGHT INTO TUESDAY. 70-90 PERCENT OF SREF MEMBERS CORROBORATE MEASURABLE QPF TONIGHT INTO TUESDAY...THUS FORECAST CONFIDENCE WAS HIGH FOR A FAIRLY WIDESPREAD RAIN EVENT ACROSS THE FORECAST AREA IN THIS TIME FRAME. DURING THE MIDDLE OF THE WEEK...MODEL UNCERTAINTY WITH RESPECT TO DETAILS OF SHORT WAVES IN FAST UPPER LEVEL FLOW LOWERS FORECAST CONFIDENCE WITH REGARD TO EXACT DETAILS. TONIGHT...ONGOING CONVECTION IN PARTS OF THE FORECAST AREA SHOULD MOVE QUICKLY NORTHWARD...THEN NEXT ROUND ASSOCIATED WITH COLD FRONT SHOULD MOVE IN OVERNIGHT. PRECIPITABLE WATER VALUES OF 1.5-2.0 INCHES SHOULD ENHANCE ABILITY FOR STRONGER CONVECTION TO PRODUCE LOCALLY HEAVY RAIN...PER CURRENT DATA BASE. NARROW WINDOW OF OPPORTUNITY FOR SEVERE WEATHER POTENTIAL UNTIL EARLY THIS EVENING BASED ON WANING INSTABILITY AFTER SUNSET. IN ADDITION...DEEP LAYER SHEAR RESIDES IN POST FRONTAL ENVIRONMENT...SO ANY SEVERE STORMS IN WARM SECTOR SHOULD BE ISOLATED WITH MAIN THREAT DAMAGING WINDS. TUESDAY...HIGHEST DEGREE OF LOW LEVEL THETA-E CONVERGENCE TIED TO THE COLD FRONT...AS WELL AS 850-700MB Q-G CONVERGENCE...IMPACTS EAST AND SOUTH SECTIONS OF THE FORECAST TUESDAY MORNING. THEREFORE... MAINTAINED HIGHEST RAIN CHANCES IN THESE LOCATIONS. AFTERWARDS... SUBSIDENCE IN WAKE OF FRONT SHOULD DIMINISH RAIN CHANCES AREAWIDE. STRONG COLD ADVECTION BEHIND THE FRONT...AS 850MB TEMPERATURES DROP FROM THE TEENS TO ABOUT 4C-8C IN THE AFTERNOON. DUE TO EXTENSIVE CLOUD COVER AND ANY LINGERING SHOWERS...TEMPERATURES SHOULD NOT CHANGE TOO MUCH. CURRENT DATA BASE ALREADY REFLECTS THIS TREND WELL. WEDNESDAY NIGHT INTO THURSDAY...GFS AND NAM/WRF INDICATED SHORT WAVE ENERGY IN NORTHWEST FLOW ALOFT COULD IMPACT FORECAST AREA. FORCING PARAMETERS ASSOCIATED WITH Q-G CONVERGENCE SUPPORTED SUFFICIENT FORCING FOR LOW-END RAIN CHANCES. DETAILS WERE STILL A BIT IN QUESTION BASED ON DETERMINISTIC MODEL DIFFERENCES ON TRACK OF SHORT WAVES. THEREFORE...OPTED TO MAINTAIN AREAL EXTENT AND RAIN PROBABILITIES AS IN CURRENT DATA BASE...WITH FURTHER EVALUATION OF SUBSEQUENT MODEL DATA ALLOWING MORE REFINEMENT OF FORECAST DETAILS. .LONG TERM...FRIDAY THROUGH MONDAY ENSEMBLE AND OPERATIONAL MODEL SUITE CONTINUES TO SUPPORT AN UPPER LEVEL AND SURFACE WAVE TO IMPACT THE UPPER MISSISSIPPI VALLEY DURING THE WEEKEND. PER NCEP MEDIUM RANGE DISCUSSION...THERE CONTINUES TO BE VARIABILITY IN MODEL SOLUTIONS WITH RESPECT TO STRENGTH/LOCATION OF A CLOSING OFF MID LEVEL LOW...THUS LENDING LOW FORECAST CONFIDENCE. CURRENT DATA BASE APPEARS TO HANDLE SCENARIO WELL ENOUGH AT THIS TIME. NO CHANGES WERE MADE TO THE EXTENDED OUTLOOK. && .AVIATION...TONIGHT THROUGH TUESDAY A WEAK VORTICITY MAXIMUM WILL MOVE NORTHEAST THROUGH THE UPPER MISSISSIPPI RIVER VALLEY LATE THIS AFTERNOON AND EVENING. THIS SYSTEM ALONG WITH DIURNAL HEATING HAS RESULTED IN SCATTERED SHOWERS AND A FEW THUNDERSTORMS DEVELOPING ACROSS SOUTHEAST MINNESOTA... NORTHEAST IOWA...AND WESTERN WISCONSIN THIS AFTERNOON. THESE SHOWERS AND THUNDERSTORMS ARE EXPECTED TO BECOME MORE WIDESPREAD TONIGHT AS A COLD FRONT MOVES SLOWLY SOUTHEAST THROUGH THE REGION. THIS FRONT WILL MOVE THROUGH KRST AROUND 06Z AND THROUGH KLSE AROUND 09Z. CEILINGS BEHIND THIS FRONT WILL BE MAINLY MVFR. IN ADDITION...THE SHOWERS AND THUNDERSTORMS WILL BE VERY EFFICIENT AT PRODUCING HEAVY RAIN TONIGHT. && .ARX WATCHES/WARNINGS/ADVISORIES... WI...NONE. MN...NONE. IA...NONE. && SHORT/LONG TERM...THOMPSON AVIATION..........BOYNE
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE LA CROSSE WI 515 PM CDT MON SEP 24 2007 IAZ008-009-018-019-MNZ079-086>088-094-095-WIZ017-029-032-251000- BUFFALO-CHICKASAW-CLARK-DODGE-FILLMORE-FLOYD-HOWARD-MITCHELL-MOWER- OLMSTED-TAYLOR-WABASHA-WINONA- 515 PM CDT MON SEP 24 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHEAST IOWA... SOUTHEAST MINNESOTA...AND WEST CENTRAL AND NORTH CENTRAL WISCONSIN. .DAY ONE...TONIGHT A COLD FRONT WILL PRODUCE SHOWERS AND THUNDERSTORMS AS IT MOVES SLOWLY SOUTHEAST THROUGH THE UPPER MISSISSIPPI RIVER VALLEY TONIGHT. A FEW OF THESE THUNDERSTORMS MAY BECOME SEVERE NORTHWEST OF A NEW HAMPTON IOWA TO NEILLSVILLE WISCONSIN LINE BETWEEN 5 PM AND MIDNIGHT. THE GREATEST SEVERE WEATHER THREATS ARE DAMAGING WINDS AND LARGE HAIL. THESE THUNDERSTORMS WILL ALSO BE CAPABLE OF PRODUCING VERY HEAVY RAIN WHICH MAY CAUSE SOME LOCALIZED FLOODING. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY THE COLD FRONT WILL GRADUALLY EXIT EAST ON TUESDAY...LINGERING SHOWERS AND ISOLATED THUNDERSTORMS ACROSS THE AREA. SEVERE WEATHER IS NOT EXPECTED WITH ANY OF THIS ACTIVITY. THE THREAT FOR THUNDERSTORMS RETURNS SATURDAY NIGHT AND SUNDAY...AS ANOTHER COLD FRONT APPROACHES FROM THE NORTHERN PLAINS. ITS TOO EARLY TO ASCERTAIN THE SEVERE WEATHER THREAT WITH THE FRONT AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED PRIOR TO MIDNIGHT TONIGHT. IN ADDITION...RAINFALL REPORTS WOULD ALSO BE APPRECIATED. .EMERGENCY MANAGEMENT COORDINATION... NO CALL IS SCHEDULED. IAZ010-011-029-030-MNZ096-WIZ033-034-041>044-053>055-061-251000- ADAMS-ALLAMAKEE-CLAYTON-CRAWFORD-FAYETTE-GRANT-HOUSTON-JACKSON- JUNEAU-LA CROSSE-MONROE-RICHLAND-TREMPEALEAU-VERNON-WINNESHIEK- 515 PM CDT MON SEP 24 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHEAST IOWA... SOUTHEAST MINNESOTA...AND SOUTHWEST INTO CENTRAL WISCONSIN. .DAY ONE...TONIGHT A COLD FRONT WILL PRODUCE SHOWERS AND THUNDERSTORMS AS IT MOVES SLOWLY SOUTHEAST THROUGH THE UPPER MISSISSIPPI RIVER VALLEY TONIGHT. THESE THUNDERSTORMS WILL BE CAPABLE OF PRODUCING VERY HEAVY RAIN WHICH MAY CAUSE SOME LOCALIZED FLOODING. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY THE COLD FRONT WILL GRADUALLY EXIT EAST ON TUESDAY...LINGERING SHOWERS AND ISOLATED THUNDERSTORMS ACROSS THE AREA. SEVERE WEATHER IS NOT EXPECTED WITH ANY OF THIS ACTIVITY. THE THREAT FOR THUNDERSTORMS RETURNS SATURDAY NIGHT AND SUNDAY...AS ANOTHER COLD FRONT APPROACHES FROM THE NORTHERN PLAINS. ITS TOO EARLY TO ASCERTAIN THE SEVERE WEATHER THREAT WITH THE FRONT AT THIS TIME. .SPOTTER INFORMATION STATEMENT... EVEN THOUGH SPOTTER ACTIVATION IS NOT EXPECTED TONIGHT...RAINFALL REPORTS WOULD BE APPRECIATED. .EMERGENCY MANAGEMENT COORDINATION... NO CALL IS SCHEDULED. BOYNE
The Minneapolis radar (KMPX), 104 km away, was scanning. The volume nearest the first event began at 23:22 UTC.
1 thunderstorm wind. Local standard time, as filed.
Two out-buildings and some trees were blown down and the roof of a barn was blown off. A large 10 x 10 foot dumpster was moved 50 feet.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Minnesota in 2007Every state in 2007This day in weather historyWarnings in Minnesota, September 2007
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: 56148.