S. during the day on the 10th.
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 DMX wrote it up.
A strong upper level system moved through the central U.S. during the day on the 10th. A cold front entered northwest Iowa during the afternoon of the 10th, and continued across the state during the night. The airmass became unstable ahead of the front with afternoon highs reaching the low 90s with dewpoints in the low to mid 60s in a narrow band ahead of the cold front. The atmosphere was weakly sheared with about 35 kts of shear available. Lifted indices fell to the -4 to -6 C range with CAPE of 1000 to 2000 J/kg. CAPE in the -10 to -30 C layer of the atmosphere was 400 to 500 J/kg, but hail production was limited by a high freezing level of around 15,000 feet. Downdraft CAPE was quite high, in the 1000 to 1300 J/kg range. Precipitable water values increased to 1.7 inches along the front, but rainfall was limited by the fact that the convection was relatively weak given other parameters. Many of the storms produced 40 to 50 MPH winds. A few produced severe winds. One storm in Emmet County toppled a two foot diameter tree and damaged a garage. Another in Cass County topped trees onto power lines on Olive Street south of Interstate 80. As the thunderstorms moved through the Bondurant area, lightning struck a house, setting it on fire.
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 Des Moines, IA wrote its last area forecast discussion before the first event at Jun 10, 2:46 PM CST, 2 hours 38 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE DES MOINES IA 346 PM CDT SUN JUN 10 2012 .SHORT TERM.../TONIGHT/ MAIN FOCUS FOR THE PERIOD TONIGHT WILL BE FRONTAL BOUNDARY CROSSING THE STATE AND ASSOCIATED CONVECTION. RAP/HRRR/NAM ALL INDICATE SCATTERED CONVECTION DEVELOPING LATE THIS AFTERNOON IN WESTERN IOWA WITH LINE FILLING IN BY 00Z AS COLD AIR ALOFT WEAKENS/DISSIPATES CAP. COLD POOL ASSOCIATED WITH THE CONVECTION SHOULD REMAIN PROGRESSIVE WITH LINE MOVING EASTWARD NICELY THROUGH THE EVENING. MAIN CONCERNS FOR SEVERE WEATHER WILL BE LARGE HAIL AND DAMAGING WINDS AS DEWPOINT DEPRESSION A BIT LARGE FOR A TORNADIC THREAT. MAY ALSO GET SOME GUSTNADOES ON FRONT OF LINE GIVEN THE DRY SOIL CONDITION WITH WINDS EASILY PICKING UP DUST AND HIGHLIGHTING ANY LEADING EDGE CIRCULATIONS. STORMS SHOULD PUT DOWN SOME HEAVY RAIN BUT THE PROGRESSIVE NATURE WILL LIMIT OVERALL TOTALS WITH AMOUNTS OF ONE HALF INCH TO INCH AT MOST. .LONG TERM /MONDAY THROUGH SUNDAY/...NO MAJOR FORECAST CONCERNS OVER DURING THE EXTENDED PERIOD WITH A STRONG UPPER LEVEL RIDGE BUILDING INTO THE EASTERN TWO-THIRDS OF THE COUNTRY MID TO LATE WEEK. LATEST ECMWF AND GFS CONTINUE TO TREND DRIER WITH THE SURFACE HIGH PRESSURE DOMINATING THE WEATHER PATTERN AND BLOCKING ANY SIGNIFICANT MOISTURE TRANSPORT FROM THE GULF INTO THE REGION. LEANED TOWARD A BLEND OF THE ECMWF/GFS THROUGH THE END OF THE WEEK AND THEN THE ECMWF DURING THE WEEKEND. MONDAY AND TUESDAY...SOME LINGERING POPS DURING THE MORNING HOURS MONDAY AS THE COLD FRONT LOOKS TO BE CLEARED OF THE FORECAST BY AROUND 12Z OR EARLIER. SECONDARY COLD FRONT WILL SWEEP ACROSS THE STATE MONDAY NIGHT AND BRING THE MUCH COOLER TEMPS INTO THE FORECAST AREA BY TUESDAY. SHOULD BE ENOUGH MIXING BEHIND THE TROUGH MONDAY...ESPECIALLY WITH MAINLY BEING WESTERLY FLOW....TO WARM MAX TEMPS BACK INTO THE 80S IN THE SOUTH. WEDNESDAY THROUGH FRIDAY...A FEW WEAK SHORTWAVES TRY TO BRING SOME MOISTURE INTO THE STATE AND POSSIBLY A FEW THUNDERSTORMS. GFS IS A LITTLE MORE BULLISH WITH A SHORTWAVE ON THURSDAY COMPARED TO THE ECMWF BRINGING A SHORTWAVE THROUGH WEDNESDAY ACROSS WESTERN IOWA. SOUNDINGS SUGGEST MAINLY HIGH BASED AND WITH SIGNIFICANT DRY AIR MASS TOWARDS THE SURFACE...HAVE LOW CONFIDENCE WRT TO ANY SUBSTANTIAL ACCUMULATING RAINFALL. KEPT CONDITIONS DRY OR SLIGHT POPS DURING THIS TIME FRAME. SATURDAY AND SUNDAY...ECMWF BEGINS TO BREAK DOWN THE RIDGE WHILE THE GFS BECOMES MORE ZONAL BY THE WEEKEND. ECMWF HAS A DECENT COLD FRONT THROUGH SATURDAY NIGHT INTO SUNDAY AND HAVE INTRODUCED SOME CHANCE POPS ATTM. THE LATEST GFS KEEPS THE RIDGE IN PLACE THROUGH EARLY NEXT WEEK. && .AVIATION...10/18Z INITIALLY VFR CONDITIONS ACROSS CENTRAL IOWA THIS AFTERNOON WITH STRONG SOUTHERLY SURFACE WINDS. HOWEVER...FRONTAL BOUNDARY WILL ENTER WESTERN IOWA EARLY THIS EVENING WITH THUNDERSTORMS MOVING EAST THROUGH THE FORECAST AREA. NUMEROUS STORMS SHOULD BE IN A QUASI-LINEAR LINE MOVING FAIRLY QUICKLY EAST DURING THE EVENING WITH MUCH OF THE CONVECTION ENDING BY 06-08Z IN CENTRAL IOWA. SOME MVFR CEILINGS AND MVFR TO IFR VISIBILITIES WILL OCCUR WITH THE CONVECTION ALONG WITH LOCALLY STRONG WINDS. THE FRONT WILL EXIT THE AREA BY 12Z ON MONDAY WITH VFR CONDITIONS ONCE AGAIN BECOMING ESTABLISHED OVER CENTRAL IOWA BY THE END OF THE PERIOD AS WINDS BECOME WEST NORTHWEST AND INCREASE WITH DAYTIME HEATING/MIXING. && .DMX WATCHES/WARNINGS/ADVISORIES...NONE. && SHORT TERM...COGIL LONG TERM...PODRAZIK AVIATION...COGIL
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE DES MOINES IA 352 PM CDT SUN JUN 10 2012 IAZ004>007-015>017-023>026-033>037-044>048-057>060-070>073-081>083- 092>094-111100- EMMET-KOSSUTH-WINNEBAGO-WORTH-PALO ALTO-HANCOCK-CERRO GORDO- POCAHONTAS-HUMBOLDT-WRIGHT-FRANKLIN-SAC-CALHOUN-WEBSTER-HAMILTON- HARDIN-CRAWFORD-CARROLL-GREENE-BOONE-STORY-AUDUBON-GUTHRIE-DALLAS- POLK-CASS-ADAIR-MADISON-WARREN-ADAMS-UNION-CLARKE-TAYLOR-RINGGOLD- DECATUR- 352 PM CDT SUN JUN 10 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL IOWA. .DAY ONE...TONIGHT NUMEROUS THUNDERSTORMS ARE EXPECTED THIS EVENING INTO TONIGHT ACROSS THE AREA. SOME SEVERE WEATHER IS EXPECTED WITH THESE STORMS INCLUDING LARGE HAIL AND DAMAGING STRAIGHT LINE WINDS THIS EVENING. BRIEF HEAVY RAIN WILL ALSO OCCUR WITH THESE STORMS. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY CHANCES FOR PERIODIC THUNDERSTORMS WILL RETURN THURSDAY THROUGH SATURDAY...MAINLY IN THE WEST. IT IS TOO EARLY TO DETERMINE THE THREAT FOR SEVERE WEATHER. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS EXPECTED PRIMARILY THIS EVENING. IAZ027-028-038-039-049-050-061-062-074-075-084>086-095>097-111100- BUTLER-BREMER-GRUNDY-BLACK HAWK-MARSHALL-TAMA-JASPER-POWESHIEK- MARION-MAHASKA-LUCAS-MONROE-WAPELLO-WAYNE-APPANOOSE-DAVIS- 352 PM CDT SUN JUN 10 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL IOWA. .DAY ONE...TONIGHT THUNDERSTORMS WILL MOVE INTO THE AREA LATER THIS EVENING. THERE EXISTS THE POSSIBILITY OF LARGE HAIL AND DAMAGING STRAIGHT LINE WIND WITH THESE STORMS. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY NON SEVERE THUNDERSTORMS WILL BE POSSIBLE MONDAY MORNING ACROSS THE AREA. CHANCES FOR PERIODIC THUNDERSTORMS WILL RETURN THURSDAY THROUGH SATURDAY...MAINLY IN THE WEST. IT IS TOO EARLY TO DETERMINE THE THREAT FOR SEVERE WEATHER. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL BE POSSIBLE TONIGHT. CC
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 457 PM CDT SUN JUN 10 2012 IAZ033-044-102300- CRAWFORD-SAC- 457 PM CDT SUN JUN 10 2012 A LINE OF SCATTERED STRONG THUNDERSTORMS THAT EXTENDS NORTH FROM OMAHA...WILL MOVE NORTHEAST AT ABOUT 20 MPH THROUGH 6 PM THROUGH CRAWFORD AND SAC COUNTIES. ONE HALF INCH DIAMETER HAIL AND WINDS GREATER THAN 40 MPH...ARE POSSIBLE WITH THESE STORMS. LOCATIONS IMPACTED INCLUDE... DOW CITY... ARION... SCHLESWIG... BUCK GROVE... DENISON AIRPORT... KIRON... DENISON... SCHALLER... DELOIT... ODEBOLT... MANILLA... VAIL... WESTSIDE... WALL LAKE... NEMAHA... A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR MUCH OF WESTERN AND CENTRAL IOWA...SO BE READY TO TAKE ACTION IF WARNINGS ARE ISSUED. JUNGBLUTH
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 624 PM CDT SUN JUN 10 2012 IAZ033-044-102345- CRAWFORD-SAC- 624 PM CDT SUN JUN 10 2012 A STRONG THUNDERSTORM WILL MOVE NORTHEAST AT 40 MPH ACROSS NORTHERN CRAWFORD AND SOUTHWEST SAC COUNTIES BEFORE 7 PM. ONE HALF INCH DIAMETER HAIL...WINDS GREATER THAN 40 MPH...ARE POSSIBLE WITH THIS STORM. LOCATIONS IMPACTED INCLUDE... SCHLESWIG... DELOIT... KIRON... ODEBOLT... JUNGBLUTH
The Sioux Falls radar (KFSD), 156 km away, was scanning. The volume nearest the first event began at 23:25 UTC.
2 thunderstorm wind, 1 lightning. Local standard time, as filed.
A two foot diameter tree was blown over. An small old garage sustained minor structural damage.
A large tree and power lines were toppled along Olive Street south of Interstate 80.
Lightning struck a house in town, setting it on fire.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Iowa in 2012Every state in 2012This day in weather historyWarnings in Iowa, June 2012
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: 375516, 375517, 375518.