Heavy rain from thunderstorms caused a small area of field and road flash flooding southwest of Ida Grove in the late afternoon and early evening of June 20th.
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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 FSD wrote it up.
Heavy rain from thunderstorms caused a small area of field and road flash flooding southwest of Ida Grove in the late afternoon and early evening of June 20th.
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 Sioux Falls, SD wrote its last area forecast discussion before the first event at Jun 20, 4:50 PM CST, 0 minutes earlier.
AREA FORECAST DISCUSSION FOR SOUTHEAST SD/SOUTHWEST MN/NORTHWEST IA NATIONAL WEATHER SERVICE SIOUX FALLS SD 550 PM CDT WED JUN 20 2012 .DISCUSSION.../ISSUED AT 344 PM CDT/ FRONTAL BAND OF THUNDERSTORMS SHOULD MOVE SOUTHEAST OUT OF OUR NORTHWEST IOWA SHORTLY BY SUNSET. POSTFRONTAL SCATTERED LIGHT SHOWERS AND ISOLATED THUNDERSTORMS EXTENDING WEST OVER MOST OF AREA WILL DECREASE THIS EVENING AND SHIFT EASTWARD OUT OF THE AREA LATE THIS EVENING. CLOUDS OVER THE AREA AND OTHER CLOUDS IN THE COOL AIR TO THE NORTHWEST WILL STEADILY DECREASE THIS EVENING AND SKIES SHOULD BECOME MOSTLY CLEAR TONIGHT. WINDS WILL BE FAIRLY LIGHT...AND COOLER TEMPERATURES WILL CONSIST OF LOWS IN THE LOW TO MID 50S RANGE. THURSDAY WILL BE SUNNY OR MOSTLY SUNNY IN A DRY REGIME...DAYTIME HEATING MAY PRODUCE SCATTERED CUMULUS MAINLY NORTHEAST. HIGH TEMPERATURES THURSDAY WILL BE IN THE MID 70S TO LOW 80S...OR FAIRLY CLOSE TO GUIDANCE. A FAIRLY LIGHT NORTHWEST BREEZE DURING THE DAY WILL DIE TO CALM OR NEARLY SO BY EARLY EVENING. UPPER LEVEL RIDGE OVER THE FAR WESTERN HIGH PLAINS WILL CONTINUE TO EXPAND EASTWARD ON FRIDAY PUSHING SOME STRONG THETA-E ADVECTION INTO OUR WESTERN CWA. GFS AND NAM CONTINUE TO PICK UP ON THE POTENTIAL FOR SOME ISOLATED ELEVATED CONVECTION ON FRIDAY...ALBEIT SLIGHTLY LATER IN THE MORNING INTO THE AFTERNOON WITH THE ARRIVAL OF A VORT MAX LOBE AND PERHAPS SOME MINOR MID LEVEL FRONTOGENESIS. PUSHED BACK THE ISOLATED STORMS A FEW HOURS LATER AND EXTENDED IT SLIGHTLY FARTHER EAST INTO SOUTHWEST MINNESOTA. A BETTER POTENTIAL FOR STORMS WILL ARRIVE FRIDAY NIGHT INTO SATURDAY WITH THE ARRIVAL OF A MID LEVEL SHORTWAVE WHICH EJECTS FROM THE CENTRAL ROCKIES AND TOPS THE RIDGE. MODELS HAVE SLOWED THIS WAVE A BIT FROM PREVIOUS RUNS...WHICH WILL LIKELY DELAY THE ONSET OF THUNDERSTORMS ACROSS OUR EAST UNTIL AFTER MIDNIGHT. MODELS HAVE ALSO BEGUN TO DIVERGE A BIT WITH THE TRACK OF THIS WAVE...WITH THE NAM AND GFS FOLLOWING A TRACK THROUGH THE NEBRASKA AND THE MISSOURI RIVER VALLEY...WHILE THE GEM TAKES IT INTO NORTHERN SOUTH DAKOTA AND THE ECMWF THROUGH THE INTERSTATE 90 CORRIDOR. LEFT SOME LIKELY POPS IN BUT SHIFTED THEM CLOSER TO THE MISSOURI RIVER AND SLOWED THE OVERALL PROGRESS OF THE WAVE AROUND BY 6 HOURS. FOR THE FIRST HALF OF NEXT WEEK...OVERALL WEATHER PATTERN WILL BE DOMINATED BY THE BROAD UPPER LEVEL RIDGING WHICH REBUILDS OVER THE WESTERN HIGH PLAINS FRONT RANGE OF THE ROCKIES ON SATURDAY NIGHT AND SUNDAY...THEN SHIFTS SLIGHTLY EASTWARD AND BECOME MORE AMPLIFIED MONDAY AND TUESDAY. EXPECT MAINLY DRY WEATHER DURING THIS PERIOD WITH MOSTLY CLEAR TO PARTLY CLOUDY SKIES. TEMPERATURES LOOK NEAR TO SLIGHTLY ABOVE NORMAL WITH WINDS GENERALLY EAST TO SOUTHEAST.... HOWEVER WITH FAIRLY WARM MID LEVELS AND A GREATER AMPLIFICATION OF THE RIDGE MONDAY AND TUESDAY...DID BUMP UP HIGHS A FEW DEGREES IN THE WEST. && .AVIATION.../FOR THE 00Z TAFS/ SHOWERS AND THUNDERSTORMS ACROSS NORTHWEST IOWA...SOUTHWEST MINNESOTA...EASTERN NEBRASKA AND FAR SOUTHEAST SOUTH DAKOTA WILL CONTINUE TO MOVE SOUTHEAST. EXPECT MOST OF THE RAIN TO BE EAST OF THE AREA BY 03Z OR 04Z. IN GENERAL...EVEN WITH CONVECTION VSBYS AND CIGS ARE VFR BUT A BRIEF PERIOD OF MVFR CONDITIONS ARE POSSIBLE WITH THE STRONGEST STORMS THROUGH 02Z SOUTHEAST OF A KSUX TO KSPW LINE. IN ADDITION TO THESE SHOWERS...THERE COULD BE AN ISOALTED SHOWER OR THUNDESTORM OVER SOUTH CENTRAL SD. THESE WILL DISSIPATE WITH SUNSET. AFTER THE PRECIPITATION EXITS...SKIES WILL BECOME CLEAR WITH VFR CONDITIONS EXPECTED THROUGH 00Z FRI. WINDS MAY BRIEFLY SWITCH TO WEST OR EVEN SW AHEAD OF A WEAK TROUGH BUT THEN RETURN TO NW BY 09Z ACROSS THE AREA. WINDS MAY BE GUSTY TOMORROW MORNING INTO MID AFTERNOON WITH DRY ATMOSPHERE BUT DECREASE AS A SURFACE RIDGE MOVES IN DURING THE AFTERNOON. && .FSD WATCHES/WARNINGS/ADVISORIES... SD...NONE. MN...NONE. IA...NONE. NE...NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SIOUX FALLS SD 524 PM CDT WED JUN 20 2012 SDZ038>040-050-052>071-MNZ071-072-080-081-089-090-097-098- IAZ001>003-012>014-020>022-031-032-NEZ013-014-211200- AURORA-BEADLE-BON HOMME-BROOKINGS-BRULE-BUENA VISTA IA- CHARLES MIX-CHEROKEE IA-CLAY-CLAY IA-COTTONWOOD MN-DAKOTA NE- DAVISON-DICKINSON IA-DIXON NE-DOUGLAS-GREGORY-HANSON-HUTCHINSON- IDA IA-JACKSON MN-JERAULD-KINGSBURY-LAKE-LINCOLN-LINCOLN MN- LYON IA-LYON MN-MCCOOK-MINER-MINNEHAHA-MOODY-MURRAY MN-NOBLES MN- OBRIEN IA-OSCEOLA IA-PIPESTONE MN-PLYMOUTH IA-ROCK MN-SANBORN- SIOUX IA-TURNER-UNION-WOODBURY IA-YANKTON- 524 PM CDT WED JUN 20 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST SOUTH DAKOTA... SOUTHWEST MINNESOTA...NORTHWEST IOWA...AND NORTHEAST NEBRASKA. .DAY ONE...TODAY AND TONIGHT THUNDERSTORMS... SCATTERED THUNDERSTORMS ARE EXPECTED THROUGH THE EARLY EVENING HOURS IN NORTHWEST IOWA...AND SOUTHWEST MINNESOTA. THESE STORMS ARE NOT EXPECTED TO BE SEVERE...BUT MAY LEAD TO LOCALLY HEAVY RAINFALL. FLOODING... TRAINING THUNDERSTORMS ACROSS NORTHWEST IOWA WILL PRODUCE LOCALLY HEAVY RAINFALL EARLY THIS EVENING LEADING TO FLASH FLOODING. RAINFALL AMOUNTS OF THREE TO FIVE INCHES CAN BE EXPECTED ACROSS PORTIONS OF WOODBURY...IDA...CHEROKEE...BUENA VISTA...AND CLAY COUNTIES IN NORTHWEST IOWA. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY ISOLATED THUNDERSTORM WILL BE POSSIBLE FRIDAY...MAINLY NORTH OF INTERSTATE 90...BUT SEVERE WEATHER IS NOT EXPECTED. MORE WIDESPREAD STORMS ARE POSSIBLE OVER THE AREA FRIDAY NIGHT INTO SATURDAY...BUT THE SEVERE STORM THREAT IS MINIMAL AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY AND TONIGHT. && FOR MORE INFORMATION PLEASE VISIT OUR WEBSITE AT WWW.WEATHER.GOV/SIOUXFALLS. THIS INCLUDES THE GRAPHICAL HAZARDOUS WEATHER OUTLOOK.
The Omaha radar (KOAX), 124 km away, was scanning. The volume nearest the first event began at 22:48 UTC.
1 flash flood. Local standard time, as filed.
Heavy rainfall of 3.8 inches in a short time caused flash flooding of fields and a few county roads.
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: 396272.