A thunderstorm produced winds which caused tree damage in Clay County in the late afternoon of June 10th.
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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.
A thunderstorm produced winds which caused tree damage in Clay County in the late afternoon of June 10th.
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 10, 2:15 PM CST, 2 hours 59 minutes earlier.
AREA FORECAST DISCUSSION FOR SOUTHEAST SD/SOUTHWEST MN/NORTHWEST IA NATIONAL WEATHER SERVICE SIOUX FALLS SD 315 PM CDT SUN JUN 10 2012 .DISCUSSION.../ISSUED AT 315 PM CDT/ ELEVATED CONVECTION BREAKING OUT THROUGH THE JAMES VALLEY AT 19Z LIKELY A SIGN OF LIFT APPROACHING FROM WESTERN PLAINS TROUGHING...WHILE THE DEGREE OF CAPPED INSTABILITY SHOWN BY THE NARROW LINE OF FRONTAL RETURNS ALONG THE EASTERN BORDER OF SD. EXPECT THAT COVERAGE OF CONVECTION WILL INCREASE LATE AFTERNOON EAST OF INTERSTATE 29 WHICH HAS BEEN FEATURE OF SEVERAL HIGH RES MODEL RUNS. SHEAR WILL INCREASE AS THE MID LEVEL WINDS INCREASE IN ADVANCE OF TROUGH WITH A LARGE PORTION OF THE 35-45 KNOTS ALONG THE BOUNDARY. WITH MIXED LAYER INSTABILITY PERHAPS 1500-2000 J/KG AT MOST...THIS SUGGESTS AN OVERALL LOWER END THREAT FOR SEVERE STORMS...HAIL HALF DOLLAR TO GOLF BALL...WITH WINDS A SLIGHTLY HIGHER THREAT TO AROUND 65 MPH. BOUNDARY ACCELERATES EASTWARD EARLY EVENING...AND LOOKS LIKE NARROW WINDOW FOR SEVERE WILL CLOSE BY 01Z IN OUR CWA. WEAK RIDGE WILL BUILD IN BEHIND BOUNDARY THIS EVENING WITH WINDS DROPPING OFF QUICKLY AND SETTING UP A RETURN SOUTH TO SOUTHWEST FLOW. THIS WILL ALSO CHANGE QUICKLY WITH SECONDARY FRONT AS A REFLECTION OF UPPER TROUGH SWEEPING SOUTHEAST ACROSS THE AREA LATE TONIGHT. /CHAPMAN DRY AND COOLER REGIME WILL RULE MONDAY INTO TUESDAY. SOME CLOUDS CAN BE EXPECTED MAINLY NORTH MONDAY AS COOL TROUGH PASSES BY TO THE NORTH...BUT IT SHOULD BE NO WORSE THAN PARTLY CLOUDY. TUESDAY SHOULD BE FAIRLY SUNNY EXCEPT FOR AN INCREASE IN CLOUDS STARTING UP WEST OR SOUTHWEST IN THE AFTERNOON. GUIDANCE TEMPERATURES ARE IN THE BALLPARK. TUESDAY NIGHT AND WEDNESDAY SHOULD BRING SHOWERS AND THUNDERSTORMS MOVING ACROSS THE AREA FROM THE WEST OR SOUTHWEST. MODEL CONSISTENCY ON SHORT WAVE IS FAIRLY HIGH AND SYSTEM IS ACCOMPANIED BY FAVORABLE THERMAL AND MOISTURE FIELDS FOR GARDEN VARIETY CONVECTION. SOME WARMING IS EXPECTED. WEDNESDAY NIGHT WILL SEE ACTIVITY ENDING AS THIS WAVE MOVES OUT. THURSDAY SHOULD BE RAIN FREE AND WARMER WITH RIDGING BUILDING IN. FRIDAY THROUGH THE WEEKEND THEN LOOKS LIKE CONTINUED WARM...MORE HUMID...AND A THREAT OF SHOWERS AND THUNDERSTORMS. TIMING OF THREAT UNCERTAIN WITH GFS AND EC VASTLY DIFFERENT FOR THE WEEKEND...THE EC BEING MUCH MORE PROGRESSIVE AND DRYING THE AIR OUT BEHIND PASSING TROUGH...THE GFS HINTING AT A RATHER SOGGY PERIOD. WILL KEEP POPS AT A MODEST CHANCE LEVEL UNTIL THE PATTERN BECOMES BETTER RESOLVED. && .AVIATION.../FOR THE 18Z TAF ISSUANCE/ COLD FRONT ALONG THE SOUTH DAKOTA BORDER WILL FOCUS THE SIGNIFICANT AVIATION CONCERNS FOR THE SHORT TERM. CONVECTION IS EXPECTED TO DEVELOP NEAR AND POST FRONTAL DURING THE 19Z-22Z TIMEFRAME...MAINLY EAST OF INTERSTATE 29...WITH MOST ISOLATED ACTIVITY TO THE WEST. STRONG SOUTHERLY WINDS WITH GUSTS AROUND 25 MPH AHEAD OF THE FRONT WILL BE REPLACED BY A SEVERAL HOUR PERIOD OF GUSTY NORTHWEST WINDS...BUT SHOULD DECOUPLING QUICKLY THIS EVENING. BRIEF PERIOD OF MVFR CEILINGS WILL BE POSSIBLE AT KHON AT THE VERY START OF THE VALID TAF...DURING THE MIDDLE AFTERNOON AROUND KFSD... AND LEAST LIKELY AROUND KSUX OUTSIDE ANY POTENTIAL THUNDERSTORMS LATE AFTERNOON /CHAPMAN && .FSD WATCHES/WARNINGS/ADVISORIES... SD...NONE. MN...NONE. IA...NONE. NE...NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SIOUX FALLS SD 1139 AM CDT SUN JUN 10 2012 SDZ038>040-050-052>071-MNZ071-072-080-081-089-090-097-098- IAZ001>003-012>014-020>022-031-032-NEZ013-014-111200- 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- 1139 AM CDT SUN JUN 10 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST SOUTH DAKOTA... SOUTHWEST MINNESOTA...NORTHWEST IOWA...AND NORTHEAST NEBRASKA. .DAY ONE...TODAY AND TONIGHT THUNDERSTORMS... ISOLATED SHOWERS AND THUNDERSTORMS WILL BE POSSIBLE EARLY THIS AFTERNOON ACROSS FAR EASTERN SOUTH DAKOTA. ANY STORMS BETWEEN THE JAMES VALLEY AND INTERSTATE 29 ARE NOT EXPECTED TO BE SEVERE. HOWEVER...BETWEEN 2PM AND 4PM...SCATTERED THUNDERSTORMS ARE EXPECTED TO DEVELOP QUICKLY IN AREAS JUST EAST OF INTERSTATE 29 IN SOUTHWEST MINNESOTA AND NORTHWEST IOWA...AS WELL AS AREAS OF EXTREME NORTHEAST NEBRASKA. THESE STORMS WILL BE CAPABLE OF PRODUCING HAIL UP TO GOLF BALL SIZE AND WINDS GUSTS TO AROUND 65 MPH IN AREAS EAST OF A LINE FROM MARSHALL TO ROCK RAPIDS TO EMERSON...AND ESPECIALLY TOWARD THE HIGHWAY 59 AND 71 CORRIDORS. THE SEVERE WEATHER THREAT WILL PUSH OFF TO THE EAST OF THE AREA BY AROUND 7 PM. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY THERE IS A CHANCE OF THUNDERSTORMS LATER TUESDAY NIGHT INTO WEDNESDAY. SEVERE WEATHER IS NOT EXPECTED WITH THESE STORMS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL BE POSSIBLE BETWEEN 2 PM AND 7 PM CDT ACROSS SOUTHWEST MINNESOTA...NORTHWEST IOWA AND EXTREME NORTHEAST NEBRASKA. && FOR MORE INFORMATION PLEASE VISIT OUR WEBSITE AT WWW.WEATHER.GOV/SIOUXFALLS. THIS INCLUDES THE GRAPHICAL HAZARDOUS WEATHER OUTLOOK.
The Sioux Falls radar (KFSD), 150 km away, was scanning. The volume nearest the first event began at 23:13 UTC.
1 thunderstorm wind. Local standard time, as filed.
Thunderstorm winds caused tree damage, including at least one tree and several large branches blown down.
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: 395779.