The atmosphere remained unstable with a continued influx of warm and moist air into the state. Thunderstorms were fairly widespread, but most only produced very heavy rainfall, small hail, and gusty winds.
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.
The atmosphere remained unstable with a continued influx of warm and moist air into the state. Thunderstorms were fairly widespread, but most only produced very heavy rainfall, small hail, and gusty winds. A few storms in Marshall and Tama County produced sever winds with tree branches broken northwest of Toledo in Tama County and a dugout at a school destroyed by high winds south of Marshalltown in Marshall 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 27, 11:38 AM CST, 37 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE DES MOINES IA 1238 PM CDT FRI JUN 27 2014 .SYNOPSIS... ISSUED AT 326 AM CDT FRI JUN 27 2014 WEAK WARM FRONT REMAINS TO THE SOUTH OF IOWA AND WILL LIFT NORTH OVER THE NEXT 36 HOURS. A SERIES OF UPPER LEVEL DISTURBANCES WILL AFFECT THE AREA. A SIGNIFICANT NEG TILT TROUGH WILL SWING THROUGH THE STATE SATURDAY NIGHT. A SECOND UPPER AIR DISTURBANCE AND ALSO THE COLD FRONT WILL MOVE THROUGH SUNDAY NIGHT AND MON. HIGH PRESSURE WILL BUILD INTO THE STATE MON AND TUE FOLLOWED BY HIGH PRESSURE FOR MID WEEK. && .SHORT TERM /TODAY/... ISSUED AT 326 AM CDT FRI JUN 27 2014 WEAK MCV IN SOUTHWEST IOWA WILL BRING THE NEXT ROUND OF SHOWERS/THUNDERSTORMS ACROSS THE CENTRAL PORTION OF THE FORECAST THROUGH 15Z. THERE ARE A FEW POCKETS OF HEAVIER RAIN ON THE LEADING EDGE OF THIS CLUSTER MOVING NORTHWARD...BUT MAINLY STRATIFORM PRECIP TRAILS BEHIND. 500MB SHORTWAVE TROUGH AND VORT MAX WILL TRANSITION EAST TO NORTHEAST THROUGH MIDDAY/EARLY AFTERNOON AND EXPECTING THE SOUTHWEST TO DRY OUT PAST 18Z. HAVE THE HIGHER POPS THIS AFTERNOON ACROSS THE NORTHEAST AS THE DEEPER FORCING MOVES INTO EASTERN IOWA WITH THE STRONGER SHORTWAVE. NO SHORTAGE OF MOISTURE TRANSPORT INTO THE STATE AND IS EVIDENT THE DEEP LAYER OF MOISTURE REMAINS PRESENT PER FORECAST SOUNDINGS AT DSM. WARM LAYER CLOUD DEPTHS RANGING AROUND 12KFT TO NEAR 13KFT AND THE PRECIPITABLE WATER VALUES IN THE 1.50 TO 1.75 INCH RANGE...SO STILL LOOKING AT ANOTHER ROUND OF POTENTIAL EFFICIENT RAIN PRODUCERS TODAY AS GENERALLY THE 1 TO NEAR 3 INCH PER HOUR RATES ARE POSSIBLE. HOWEVER...THE STORM PROGRESSION LOOKS TO BE AROUND 15-20 KNOTS TODAY PER CORFIDI VECTORS...SO THE HEAVY RAIN OVER ONE AREA SHOULD BE SHORT-LIVED UNLESS BACK-BUILDING OCCURS LIKE THURSDAY. THE 27.05Z HRRR HAS A DECENT HANDLE ON CURRENT CONVECTIVE TRENDS...ALBEIT ROUGHLY TWO HOURS TOO FAST...BUT LEANED TOWARD THE HRRR THROUGH THE MORNING HOURS FOR POP/WX TRENDS. .LONG TERM /TONIGHT THROUGH THURSDAY/... ISSUED AT 326 AM CDT FRI JUN 27 2014 MUCH OF THE ACTIVITY TONIGHT WILL REMAIN TO THE WEST OF IA WHERE THERE IS STRONGER FORCING. NEGATIVE TILT TROUGH WILL BRING A GOOD CHANCE FOR WIDESPREAD THUNDERSTORM ACTIVITY SAT AND SAT NIGHT. SEVERE WEATHER IS LIKELY TO REMAIN TO THE WEST OF IA. THE COLD FRONT IN COMBINATION WITH THE STRENGTHENING JET STREAM...OVER 80 KTS, WILL BRING A CHANCE FOR SEVERE WEATHER FOR LATE SUNDAY INTO SUNDAY NIGHT. WILL MENTION BOTH SEVERE AND HEAVY RAIN IN THE BODY OF THE ZONES. DEEP WARM CLOUD LAYER THICKNESS...OVER 4 KM AND PWAT VALUES NEAR 2 INCHES. THE SEVERE POTENTIAL IS PRETTY HIGH WITH STEEP LAPSE RATES AND CAPE NEAR 5000 J/KG. THOUGH NOT PERFECT, THE HODOGRAPHS ARE FAVORABLE WITH DECENT SHEAR...BOTH SPEED AND DIRECTION...IN PLACE. COOLER AND DRIER WEATHER IS ON TAP FROM THE BEGINNING OF NEXT WEEK ON. THE COLDEST AIR WILL MISS IA TO THE NORTHEAST AND THE COOLING TREND DOESN'T LOOK LIKE IT WILL LAST ALL THAT LONG EITHER. DON'T EXPECT TO SEE MORE THAN TWO OR THREE DAYS BELOW NORMAL. && .AVIATION...27/18Z ISSUED AT 1238 PM CDT FRI JUN 27 2014 BROKEN BAND OF THUNDERSTORMS WILL AFFECT DSM/MCW/ALO INTERMITTENTLY DURING THE NEXT SEVERAL HOURS...WITH PERIODS OF MVFR CIGS POSSIBLE AT ALL TERMINALS DURING THIS TIME. EXPECT THE STORMS TO END BY AROUND 22Z OR EARLIER...WITH VFR CONDITIONS PREVAILING IN THE EVENING AND EARLY TONIGHT. AS WARM AIR/MOISTURE ADVECTION INCREASES OVERNIGHT CIGS WILL LOWER AGAIN WITH LIGHT BR LIKELY FORMING AND HAVE INDICATED THIS IN THE 18Z TAFS. FURTHER TSRA POTENTIAL TONIGHT INTO SAT MORNING IS A CONCERN...BUT CONFIDENCE IN TIMING AND COVERAGE PRECLUDES MENTION IN TAFS ATTM. && .HYDROLOGY... ISSUED AT 326 AM CDT FRI JUN 27 2014 WITH HIGH PWATS AND SLOW MOVEMENT OF WEATHER SYSTEM...THE POTENTIAL FOR FLOODING IS FAIRLY HIGH. RAINFALL OF THE PAST DAY OR SO HAS MOISTENED SOILS SO THE FFG IS DOWN TO AROUND AN INCH IN SEVERAL LOCATIONS. THE BEST POTENTIAL WILL COME SUNDAY NIGHT...THOUGH THE CURRENT PATTERN GIVES AT LEAST SOME RISK TO THE ENTIRE CWA THROUGH THE NEXT THREE DAYS. && .DMX WATCHES/WARNINGS/ADVISORIES...NONE. && SYNOPSIS...MS JUN 14 SHORT TERM...PODRAZIK LONG TERM...MS JUN 14 AVIATION...LEE HYDROLOGY...MS JUN 14
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE DES MOINES IA 440 AM CDT FRI JUN 27 2014 IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075- 081>086-092>097-280945- EMMET-KOSSUTH-WINNEBAGO-WORTH-PALO ALTO-HANCOCK-CERRO GORDO- POCAHONTAS-HUMBOLDT-WRIGHT-FRANKLIN-BUTLER-BREMER-SAC-CALHOUN- WEBSTER-HAMILTON-HARDIN-GRUNDY-BLACK HAWK-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- 440 AM CDT FRI JUN 27 2014 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL IOWA. .DAY ONE...TODAY AND TONIGHT FLOOD WARNINGS ARE IN EFFECT FOR SOME RIVER BASINS. PLEASE REFER TO THE NATIONAL WEATHER SERVICE WEBSITE AT WEATHER.GOV/DESMOINES FOR FURTHER DETAILS. SCATTERED THUNDERSTORMS WITH BRIEF PERIODS OF HEAVY RAINFALL ARE EXPECTED. SEVERE WEATHER IS NOT LIKELY...BUT LOCAL FLOODING IS POSSIBLE.. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY PERIODS OF THUNDERSTORMS ARE EXPECTED SATURDAY INTO MONDAY. THERE IS LITTLE RISK OF SEVERE THUNDERSTORMS THROUGH SATURDAY NIGHT. SEVERE THUNDERSTORMS ARE QUITE POSSIBLE SUNDAY AFTERNOON INTO THE OVERNIGHT HOURS. HIGH WINDS WILL BE THE PRIMARY THREAT...WITH HAIL A SECONDARY THREAT. AN ISOLATED TORNADO IS ALSO POSSIBLE SUNDAY AFTERNOON AND EVENING. LOCALLY HEAVY RAINFALL IS POSSIBLE SATURDAY NIGHT...AND AGAIN SUNDAY AFTERNOON AND NIGHT. FLASH FLOODING IS POSSIBLE. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED TODAY BUT MAY BE NEEDED SUNDAY AFTERNOON AND NIGHT.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
907 AM CDT FRI JUN 27 2014
...TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
...DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0700 AM HEAVY RAIN 2 N GRANGER 41.79N 93.82W
06/27/2014 M3.36 INCH DALLAS IA COCORAHS
24 HOUR RAINFALL
&&
NWS DES MOINES IA
IRIS SYSTEMPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
908 AM CDT FRI JUN 27 2014
...TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
...DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0700 AM HEAVY RAIN 4 N LINDEN 41.70N 94.27W
06/27/2014 M3.13 INCH DALLAS IA COCORAHS
24 HOUR RAINFALL
&&
NWS DES MOINES IA
IRIS SYSTEMPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
914 AM CDT FRI JUN 27 2014
...TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
...DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0700 AM HEAVY RAIN 1 SE MADRID 41.87N 93.81W
06/27/2014 M2.96 INCH BOONE IA COCORAHS
24 HOUR RAINFALL
&&
NWS DES MOINES IA
IRIS SYSTEMPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
916 AM CDT FRI JUN 27 2014
...TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
...DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0700 AM HEAVY RAIN 2 WNW ANKENY 41.74N 93.64W
06/27/2014 M2.93 INCH POLK IA COCORAHS
24 HOUR RAINFALL
&&
NWS DES MOINES IA
IRIS SYSTEMPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
917 AM CDT FRI JUN 27 2014
...TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
...DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0700 AM HEAVY RAIN 1 SE WINDSOR HEIGHTS 41.59N 93.70W
06/27/2014 M2.64 INCH POLK IA COCORAHS
24 HOUR RAINFALL
&&
NWS DES MOINES IA
IRIS SYSTEMPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
941 AM CDT FRI JUN 27 2014
...TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
...DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0700 AM HEAVY RAIN GREENFIELD 41.31N 94.46W
06/27/2014 M4.30 INCH ADAIR IA MESONET
24 HOUR RAINFALL
&&
NWS DES MOINES IA
IRIS SYSTEMThe Des Moines radar (KDMX), 75 km away, was scanning. The volume nearest the first event began at 18:14 UTC.
2 thunderstorm wind. Local standard time, as filed.
A dugout at a school was destroyed by high winds. Power was out through much of the town.
Four to five inch diameter walnut tree branches were blown down by high wind.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Iowa in 2014Every state in 2014This day in weather historyWarnings 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: 515152, 515153.