A warm and humid airmass was in place over Iowa during the day on the 1st. Maximum temperatures were in the 80s to near 90, with dew points in the mid 60s to around 70.
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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 DMX wrote it up.
A warm and humid airmass was in place over Iowa during the day on the 1st. Maximum temperatures were in the 80s to near 90, with dew points in the mid 60s to around 70. The atmosphere became unstable with CAPE values around 2000 J/kg. Downdraft CAPE was between 900 and 1200 J/kg. The freezing level was quite high, around 14,000 feet with CAPE in the -10 to -30 C layer of the atmosphere around 500 J/kg. Precipitable water values were between 1.3 and 1.6 inches. The LCL in northern Iowa was around 1000 meters. A line of thunderstorms formed along the front by afternoon and propagated into Iowa. The storms produced a weak landspout in Winnebago County west of Buffalo Center. The storms produced little in the way of large hail with the largest report receiving being of nickel size hail in Calhoun County at Manson. Most storms produced wind gusts of 35 to 55 MPH. Very heavy rainfall occurred over northwest Iowa with reports of 4 to 6 inches in Kossuth and Palo Alto Counties in a few hours. The heaviest rainfall was a 6 inch report northeast of Cylinder in Palo Alto County. There was also 5.28 inches measured in Kossuth County south of Lone Rock by a mesonet station. The heavy rains resulted in Flash Flooding in Kossuth County.
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 1, 5:39 AM CST, 6 hours 3 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE DES MOINES IA 639 AM CDT SUN JUN 1 2014 .SYNOPSIS... ISSUED AT 315 AM CDT SUN JUN 1 2014 FRONTAL BOUNDARY FROM NRN MN INTO KS WILL MOVE THROUGH IA BY MONDAY NIGHT. LOW PRESSURE WILL DEVELOP OVER CO TUE AND MOVE EAST ACROSS NRN MO TUE NIGHT AND WED. COOL PACIFIC HIGH PRESSURE WILL FOLLOW. && .SHORT TERM /TODAY/... ISSUED AT 315 AM CDT SUN JUN 1 2014 ONGOING CONVECTION SKIRTING THE NORTHERN EDGES OF THE FORECAST AREA CURRENTLY AS MOISTURE TRANSPORT FOCUSES INTO BOUNDARY ACROSS SD AND MN. PWATS WILL CONTINUE TO REMAIN HIGH TODAY WITH MOIST FLOW FROM THE SOUTH PERSISTING ACROSS THE STATE. WEAK SHORTWAVE CROSSING THE MISSOURI RVR CURRENTLY WILL PASS THROUGH THE FORECAST AREA THIS MORNING WITH WEAK FORCING. NAM AND HRRR BOTH DEVELOP SCT CONVECTION ACROSS THE NORTH AND EAST WITH THE PASSAGE OF THIS FEATURE AND HAVE CONTINUE THE THREAT IN THESE AREAS THIS MORNING. THERE APPEARS TO BE A BREAK ACROSS MUCH OF THE AREA EXCEPT THE FAR NORTH DURING THE AFTERNOON PRIOR TO THE MAIN SHOW STARTING TOWARD THE END OF THE PERIOD ACROSS NORTHWEST IOWA AND BACK INTO NEBRASKA. HAVE KEPT THE LIKELY POPS IN THE FAR NORTHWEST DURING THE LATE AFTERNOON AS CONVECTION IS EXPECTED TO FIRE. THE THREAT FOR SOME SEVERE WEATHER WILL BE POSSIBLE DURING THIS TIME WITH LARGE HAIL AND DAMAGING WINDS THE PRIMARY THREAT. HEAVY RAINS ARE ALSO EXPECTED ALTHOUGH THE MAIN CONCERN WILL BE JUST AFTER THIS PERIOD INTO THE OVERNIGHT AS LOW LEVEL FLOW FOCUSES INTO WESTERN IOWA. HAVE GENERALLY GONE WITH TEMPERATURES SIMILAR TO THE PAST SEVERAL DAYS AS AIRMASS IS ESSENTIALLY THE SAME. THE SCATTERED CONVECTION OF THE PAST FEW DAYS HAS DONE LITTLE TO KEEP READINGS FROM THE MID TO UPPER 80S. .LONG TERM /TONIGHT THROUGH SATURDAY/... ISSUED AT 315 AM CDT SUN JUN 1 2014 THUNDERSTORMS WILL BE WIDESPREAD TONIGHT WITH THE S/WV AND FRONTAL SYSTEM MOVING THROUGH THE STATE. EXPECT TO SEE THE PRECIP END FORM WEST TO EAST MONDAY AS WEAK HIGH PRESSURE BUILDS IN TO THE STATE. NEXT WEATHER SYSTEM WILL BE THE WEATHER MAKER OF THE WEEK. LOW PRESSURE FROM CO WILL EXTEND A WARM FRONT EAST INTO NRN MO. STRONG H8 SPEED CONVERGENCE IS EXPECTED LATE TUE AND TUE NIGHT AS 60 KT LLJ IMPINGES ON THE FRONT. DEEP MOISTURE IN PLACE WITH PWAT VALUES APPROACHING 3 SIGMA OVER CLIMO. SEVERE WEATHER IS A DEFINITE POSSIBILITY AS DECENT CAPE WILL BE IN PLACE AND ENVIRONMENT WILL BE STRONGLY SHEARED...UNLIKE THE PAST FEW DAYS. DECENT DYNAMICS ARE ALSO IN PLACE WITH THE NEGATIVELY TILTED S/WV. HEAVY RAINFALL WITH POTENTIAL FOR FLASH FLOODING IS ALSO A SIGNIFICANT THREAT. MODELS DIFFER ON THE PLACEMENT. MOST OVER THE PAST FEW DAYS HAVE FOCUSED ON THE SOUTH HALF OF IA. FEEL THAT IS MOSTLY LIKELY GIVEN THE PATTERN AND PAST EXPERIENCE. NAM IS THE ODD MODEL OUT WITH A FARTHER NORTH POSITION OF THE HEAVY RAINFALL. COOLER AND DRIER WEATHER IS EXPECTED AFTER THE SYSTEM MOVES TO THE EAST ON WED. THOUGH THE HIGH IS NOT STRONG ENOUGH TO CUT OFF ALL CHANCES OF PRECIP...ESPECIALLY DURING THE CLIMO MAX FOR RAINFALL...THE NEXT PERIOD OF MORE WIDESPREAD THUNDERSTORM ACTIVITY WILL HOLD OFF UNTIL NEXT WEEKEND. && .AVIATION...01/12Z ISSUED AT 639 AM CDT SUN JUN 1 2014 WILL SEE MAINLY VFR CONDITIONS THROUGH TODAY WITH UNLIMITED VISIBILITIES AND CIGS AT OR ABOVE 10KFT. HOWEVER...THERE WILL BE SOME LOCAL CONVECTION WHICH MAY PRODUCE LOCAL MVFR/IFR CONDITIONS IN AND NEAR THE STORMS. BY TONIGHT...APPROACH OF SYSTEM WILL LEAD TO WIDESPREAD THUNDERSTORM ACTIVITY IN CENTRAL IOWA SPREADING FROM WEST TO EAST OVERNIGHT. PRIOR TO THE ARRIVAL OF THE CONVECTION... CONDITIONS WILL BE VFR. HOWEVER...A DECREASE TO MVFR OR EVEN IFR CAN BE EXPECTED WITH THE STORMS AND PRECIPITATION OVERNIGHT. WINDS WILL BE FROM THE SOUTH TODAY AND FOR MUCH OF THE NIGHT BUT WILL BEGIN TO BECOME WESTERLY ACROSS WESTERN IOWA LATE TONIGHT BEHIND A COLD FRONT. && .DMX WATCHES/WARNINGS/ADVISORIES...NONE. && SYNOPSIS...MS JUN 14 SHORT TERM...COGIL LONG TERM...MS JUN 14 AVIATION...COGIL
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE DES MOINES IA 427 AM CDT SUN JUN 1 2014 IAZ004>007-015>017-023>028-033>039-021100- EMMET-KOSSUTH-WINNEBAGO-WORTH-PALO ALTO-HANCOCK-CERRO GORDO- POCAHONTAS-HUMBOLDT-WRIGHT-FRANKLIN-BUTLER-BREMER-SAC-CALHOUN- WEBSTER-HAMILTON-HARDIN-GRUNDY-BLACK HAWK- 427 AM CDT SUN JUN 1 2014 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL IOWA. .DAY ONE...TODAY AND TONIGHT SCATTERED THUNDERSTORMS WILL DEVELOP AND BECOME NUMEROUS TONIGHT. THERE WILL BE A CHANCE OF SEVERE THUNDERSTORMS...MAINLY WEST OF U.S. HIGHWAY 169 WITH HAIL AND HIGH WIND THE MAIN THREATS. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY THUNDERSTORMS ON MONDAY WILL TAPER OFF FROM WEST TO EAST. SEVERE WEATHER IS NOT EXPECTED. ANOTHER ROUND OF THUNDERSTORMS IS EXPECTED TUESDAY NIGHT INTO WEDNESDAY. SEVERE THUNDERSTORMS ARE POSSIBLE WITH THE THREATS BEING FOR LARGE HAIL AND DAMAGING WINDS. LOCALLY HEAVY RAINFALL IS LIKELY. ISOLATED NON-SEVERE THUNDERSTORMS WILL BE POSSIBLE THURSDAY THROUGH SATURDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS POSSIBLE OVER WESTERN IOWA TONIGHT...AND OVER THE ALL OF IOWA TUESDAY NIGHT. IAZ044>050-057>062-070>075-081>086-092>097-021100- CRAWFORD-CARROLL-GREENE-BOONE-STORY-MARSHALL-TAMA-AUDUBON-GUTHRIE- DALLAS-POLK-JASPER-POWESHIEK-CASS-ADAIR-MADISON-WARREN-MARION- MAHASKA-ADAMS-UNION-CLARKE-LUCAS-MONROE-WAPELLO-TAYLOR-RINGGOLD- DECATUR-WAYNE-APPANOOSE-DAVIS- 427 AM CDT SUN JUN 1 2014 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL IOWA. .DAY ONE...TODAY AND TONIGHT SCATTERED THUNDERSTORMS WILL DEVELOP AND BECOME NUMEROUS TONIGHT. THERE WILL BE A CHANCE OF SEVERE THUNDERSTORMS...MAINLY WEST OF U.S. HIGHWAY 169 WITH HAIL AND HIGH WIND THE MAIN THREATS. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY THUNDERSTORMS ON MONDAY WILL TAPER OFF FROM WEST TO EAST. SEVERE WEATHER IS NOT EXPECTED. ANOTHER ROUND OF THUNDERSTORMS IS EXPECTED TUESDAY NIGHT INTO WEDNESDAY. SOME STORMS ARE LIKELY TO BE SEVERE WITH LARGE HAIL AND DAMAGING WINDS. AN ISOLATED TORNADO CAN NOT BE RULED OUT. HEAVY RAINFALL IS LIKELY WITH LOCAL FLASH FLOODING POSSIBLE. ISOLATED NON-SEVERE THUNDERSTORMS WILL BE POSSIBLE THURSDAY THROUGH SATURDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS POSSIBLE OVER WESTERN IOWA TONIGHT...AND OVER THE ALL OF IOWA TUESDAY NIGHT.
The Minneapolis radar (KMPX), 167 km away, was scanning. The volume nearest the first event began at 17:43 UTC.
4 heavy rain, 1 tornado, 1 flash flood, 1 hail. Local standard time, as filed.
A brief landspout occurred to the southeast of Buffalo Center on leading edge of storm.
Rainfall total over the last 5 hours and 20 minutes was 5.28 inches.
A farmer in northwest of Wittenmore reported 6 inches of rain.
Rainfall of 3.35 inches over the past two hours.
Heavy rainfall of 4.03 inches of rain in the past three hours.
Water was over 60th ave between 270th and 280th street. Overflow from nearby Black Cat Creek.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Iowa in 2014Every state in 2014This day in weather historyThe tornado archive for Iowa, 2014Warnings in Iowa, June 2014
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: 509718, 509712, 509714, 509710, 509711, 509715, 509716.