Tornadoes and Flash Flooding in Iowa, April 14 to 15, 2012

Name: Tornadoes and Flash Flooding in Iowa, April 14 to 15, 2012
Start: 2012-04-14T14:00
End: 2012-04-15T06:00
Location: Iowa

April 14 to 15, 2012 · NWS DMX · 104 events in 22 counties and zones

The first significant severe weather outbreak of the season took place during the afternoon and evening of the 14th with all modes of severe weather taking place. S.

Where it happened

Every event with a place to put it. Tap one for its entry below.

Tornadoes
Tropical storms and surge
Floods
Wind
Hail
Winter weather
Heat and drought
Cold
Fire, smoke and dust
Marine and coastal
Other

Open the live radar over this ground

The toll

Deaths: 0
Injuries: 2
Property damage: $7.3 million
Crop damage: None recorded
Events: 104

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.

What happened

The episode as NWS DMX wrote it up.

The first significant severe weather outbreak of the season took place during the afternoon and evening of the 14th with all modes of severe weather taking place. An upper level low pressure lifted northeast out of the southwest U.S. The upper level center, as well as the surface low, passed northwest of Iowa, across southeast South Dakota into Minnesota. Severe weather developed north of the warm front as it lifted north into Iowa. A cluster of severe storms formed over northeast Kansas and southeast Nebraska. These storms moved east-northeast along the warm front into Iowa, causing a considerable amount of severe weather. Severe weather parameters were fairly strong, however the dynamics of a 100 kt mid level jet and 60 kt low level jet made up the difference. Just prior to the storm development, CAPE values were around 4000 J/kg south of the development. Helicity was high, in the 300 to 500 range. There was a large amount of effective shear with 50 to 65 kts available. CAPE in the -10 to -30 layer of the atmosphere was in the 200 to 400 J/kg range, while downdraft CAPE was 600 to 800 J/kg. Plenty of low level moisture was drawn into the state on the strong low level jet. Precipitable water vales rose to 1.25 inches quite rapidly. The LCL level was relatively high, but given the dynmics was relatively easy to overcome. The LCL was just under 1000 meters at the beginning of the event. There were three tornadoes reported during the event. One was northwest of the Creston area in Union County. The most significant tornado caused high end EF2 damage to the far northwest corner of Creston. This tornado formed southwest of Cromwell at 1752 CST in Adams county and quickly tracked into northwest Creston around 1800 CST. EF2 damage occurred to the Greater Regional Medical Center and the Southwestern Community College campus. The tornado continued tracking to the northeast and damaged several farmsteads northeast of Creston before dissipating about 10 miles northeast of town at approximately 1815 CST. The wind strength was estimated to be 130 MPH. Significant damage occurred with uninsured damage alone near $2,000,000. A tornado touched down in Warren County east of New Virginia. The tornado caused damage to farm buildings and campers with a considerable amount of sheet metal left lying around. The EF1 tornado produced winds around 100 MPH. Many of the thunderstorms brought with them high winds and hail. The final tornado touched down in Mahaska County. The tornado was an EF1 tornado with a broad and intense rear flank downdraft south of the track. The AWOS site at the Oskaloosa airport in Mahaska County recorded a 97 MPH wind gust from the rear flank downdraft of the storm. Reports from the Emergency Manager indicated that damage at the airport was limited to two hangar doors and some damage to airport buildings. There were no planes on the field at the time. Numerous reports of hail larger than quarter size were received. Some of the larger hail included baseball size hail in Clarke County at Murray and numerous reports of golf ball size hail along the track of the severe cluster from Union County to Mahaska County. The same cluster of storms also produced very strong winds along its path. Numerous reports of 60 to 70 MPH winds were received all along the path. Numerous reports of tree and power line damage were received. The Des Moines metro area was hard hit with winds of up to 65 MPH causing considerable tree damage. At one time, 20,000 customers were reported without power. In Marion County a garage was destroyed and a house significantly damaged by the wind east of Knoxville. The storms also produced very heavy rainfall. Rainfall of 2 to 4 inches was reported at several locations. At the Des Moines International Airport, 1.10 inches of rain fell between 1630 and 1637 CST. This amount of rainfall in that short of period of time was a 100 year event. Fortunately it had been quite dry across the state, limiting the flash flood potential. Flash flooding was reported in Polk, Cass, and Madison Counties. Water was reported flowing one to two feet deep. Numerous reports were also received of street flooding and significant ponding.

What forecasters said that day

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 Apr 14, 12:00 PM CST, 2 hours earlier.

Area forecast discussion, Apr 14, 12:00 PM CST, 2 hours before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DES MOINES IA
100 PM CDT SAT APR 14 2012

.SHORT TERM /TODAY/...
THINGS WILL CHANGE FAST THROUGH THE DAY TODAY WITH THE STRONG SYSTEM
IN THE WEST BEGINNING TO LIFT OUT.  THE FIRST PROBLEM WILL BE WITH
THE FOG THAT HAS FORMED ALONG AND WEST OF THE WEST EDGE OF THE
STRATUS FIELD.  SEVERAL LOCATIONS HAVE FALLEN TO 1/2SM WITH A FEW
ZEROS AS THE MOISTURE SPREAD NORTH AND AIRMASS ALREADY SATURATED
FROM YESTERDAYS RAINFALL.  WILL HOIST A DENSE FOG ADVISORY FOR EARLY
THIS MORNING ROUGHLY WEST OF A MASON CITY TO CRESTON LINE FOR THAT.
THETA-E ADVECTION AHEAD OF DEVELOPING WARM FRONT WILL RESULT IN TSRA
SPREADING NORTH OVER THE CWA AS THE DAY GOES ON.  WENT A LITTLE
SLOWER WITH IT THAN PREVIOUS FORECAST...BUT WILL THUNDER DEVELOP
OVER THE WHOLE CWA AS THE DAY PROGRESSES.  PUT IN SOME ENHANCED
WORDING OVER THE SOUTHWEST THIS AFTERNOON AS PARAMETERS BECOME MORE
FAVORABLE FOR SEVERE WEATHER.  DYNAMICS INCREASE RAPIDLY BY MID AND
LATE AFTERNOON IN THESE AREAS EVEN THOUGH THE HIGHEST THREAT WILL
REMAIN TO THE WEST

.LONG TERM /TONIGHT THROUGH FRIDAY/...
MAIN CHALLENGES THROUGHOUT THE MID/LONG RANGE CONTINUE TO CENTER ON
THE UNSETTLED PATTERN EXPECTED THROUGH THE WEEKEND INTO NEXT WEEK.
THE SOUTHWESTERLY UPPER LEVEL FLOW PATTERN IN PLACE FOR THIS WEEKEND
TRANSITIONS TO A QUICK WESTERLY/ZONAL FLOW PATTERN THROUGH THE
WEEK...WITH ENERGY CONTINUING TO EJECT EASTWARD FROM THE
INTERMOUNTAIN WEST BRINGING CHANCES FOR PRECIP TO THE AREA NEARLY
DAILY.

CONCERN FOR THE WEEKEND CENTERS AROUND DEVELOPING SURFACE LOW IN LEE
OF THE ROCKIES...AND THE ASSOCIATED FRONTAL BOUNDARIES. UPPER LEVEL
SYSTEM JUST NOW DIVING INTO THE SOUTHWESTERN US AS UPPER LEVEL
SYSTEM CONTINUES TO DIG INTO THE FOUR CORNERS REGION TODAY. THIS
WILL ALLOW STRONG SOUTHERLY PUSH OF MOISTURE FROM THE GULF INTO THE
STATE AHEAD OF A DRY LINE PUSHING EAST ACROSS THE PLAINS STATES LATE
TODAY. WARM FRONT TO LIFT NORTHWARD THROUGH THE CWA LATE THIS
AFTERNOON INTO THIS EVENING WITH CHANCES FOR SHOWERS AND
THUNDERSTORMS AS IT MOVES THROUGH THE CWA. SEVERE WEATHER EXPECTED
TO BE MAINLY WEST/SOUTHWEST OF THE AREA THIS AFTERNOON...WITH THE
CONVECTION THAT DEVELOPS IN VICINITY OF THE SFC LOW ACROSS
CENTRAL/EASTERN NE EXPECTED TO MIGRATE EAST NORTHEAST THROUGH THE
WESTERN/NORTHERN CWA BY MID/LATE EVENING. SFC LOW CENTER TO MOVE
FROM NE CO TO NE NEBRASKA BY LATE TONIGHT...WITH ACTIVITY THAT BEGAN
ON THE DRY LINE TO MOVE EAST INTO THE SOUTHERN CWA LATE TONIGHT.
INSTABILITY REALLY INCREASES ACROSS THE CWA LATE THIS EVENING INTO
THE OVERNIGHT HOURS...ALONG WITH INCREASING DEEP LAYER SHEAR AS
WELL. THIS SHOULD ALLOW FOR THREAT OF SEVERE WEATHER ACROSS THE
WESTERN CWA THROUGHOUT THE EVENING INTO THE OVERNIGHT HOURS...AND
POTENTIALLY THE EASTERN CWA AS WELL AS STORMS PROGRESS THROUGH THE
CWA LATE TONIGHT. LOW LEVEL JET STRONG AND MOISTURE TRANSPORT
ORIENTED INTO THE CWA LATE TONIGHT AS WELL...SO HAVE HIGHEST POPS IN
THE PERIOD FOR THIS EVENING INTO THE OVERNIGHT HOURS WITH DECENT
RAINFALL POSSIBLE. OTHERWISE AS SYSTEM SLIDES EAST INTO
SUNDAY...STILL HAVE SOME LINGERING CHANCES FOR SHOWERS/THUNDERSTORMS
ESPECIALLY ACROSS FAR EASTERN CWA AS DRY LINE EXPECTED TO BE IN
VICINITY OF THE EXTREME EASTERN CWA/EASTERN IOWA BY SUNDAY
AFTERNOON...WITH DRY SLOT ACROSS REMAINDER OF CWA. WITH THE
SUBSIDENCE IN THE DRY SLOT/STEEP LOW/MID LEVEL LAPSE RATES AND
STRONG SOUTHWESTERLY FLOW ALOFT...SUNDAY ALSO GOING TO BE QUITE
WINDY ACROSS THE CWA. BUFKIT SOUNDINGS INDICATE MIXING 35 TO 40 KT
WINDS TO THE SURFACE...SO WILL HAVE TO MONITOR FOR POSSIBLE WIND
ADVISORY CRITERIA. HOWEVER STRONGER CAA WITH STEEPER LAPSE RATES
PUSH IN SUNDAY NIGHT ON THE BACKSIDE OF THE SYSTEM. ALSO HAVE TROP
FOLD ALOFT...AND ISALLOBARIC COUPLET PUSHING THROUGH CWA. LUCKILY
THIS COMES THROUGH SUNDAY NIGHT AND DOES NOT LINE UP WITH DAYTIME
MIXING OR COULD HAVE HAD A HIGH WIND POTENTIAL. THEREFORE STUCK WITH
BREEZY/WINDY CONDITIONS FOR SUNDAY NIGHT AS WINDS EXPECTED TO STAY
UP THROUGH THE NIGHT. SYSTEM EXITS THE REGION MONDAY...WITH DRY
CONDITIONS RESUMING BRIEFLY FOR MONDAY INTO MONDAY NIGHT. OTHERWISE
NEXT CHANCE OF WIDESPREAD PRECIPITATION COMES THURSDAY INTO FRIDAY
AS ANOTHER SFC LOW DEVELOPS ACROSS THE CENTRAL PLAINS ASSOCIATED
WITH A DIGGING UPPER LEVEL TROUGH OVER THE EASTERN ROCKIES/WESTERN
HIGH PLAINS. AS FOR TEMPERATURES...CONTINUED WARMER THAN AVERAGE FOR
SUNDAY...WITH COOLER CONDITIONS AGAIN FOR MONDAY. OTHERWISE MAX
TEMPS MAINLY IN THE UPPER 50S AND 60S FOR THE REMAINDER OF THE WEEK.

&&

.AVIATION...14/18Z
THE STRATUS DECK OVER NORTHERN IOWA WAS RAPIDLY DISSIPATING AND
BECOMING SCATTERED EARLY THIS AFTERNOON. CEILINGS ACROSS SOUTHERN
IOWA WERE ALSO GRADUALLY IMPROVING BUT WERE STILL IN THE IFR/MVFR
RANGE. CEILINGS WILL ONLY GRADUALLY IMPROVE ACROSS SOUTHERN IOWA
THIS AFTERNOON WITH THE ANVILS FROM STORMS TO THE SOUTHWEST LIMITING
ANY RADIATIONAL BURN OFF. THE THUNDERSTORMS ACROSS EASTERN NEBRASKA
WILL TRACK INTO WESTERN IOWA THIS AFTERNOON AND ACROSS CENTRAL IOWA
IN THE EVENING. SOME OF THESE STORMS MAY BE SEVERE...WITH LARGE
HAIL...DAMAGING WINDS...AND TORNADOES ALL POSSIBLE. THESE STORMS
WILL PULL OUT OF THE AREA AFTER MIDNIGHT...WITH VERY STRONG
SOUTHERLY WINDS OF AT LEAST 25G35KTS SETTING IN BY MIDDAY TOMORROW.

&&

.DMX WATCHES/WARNINGS/ADVISORIES...NONE

&&

SHORT TERM...MS APR 12
LONG TERM...MJB
AVIATION...KS

Hazardous weather outlook, Apr 14, 8:09 AM CST, 5 hours 51 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DES MOINES IA
909 AM CDT SAT APR 14 2012

IAZ033-044-045-057-058-070-071-081-082-092-093-151415-
SAC-CRAWFORD-CARROLL-AUDUBON-GUTHRIE-CASS-ADAIR-ADAMS-UNION-TAYLOR-
RINGGOLD-
909 AM CDT SAT APR 14 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL IOWA.

.DAY ONE...TODAY AND TONIGHT

THERE IS A MODERATE RISK OF SEVERE WEATHER FOR THIS AFTERNOON
INTO TONIGHT. LARGE HAIL...DAMAGING WINDS...TORNADOES...AND
LOCALLY HEAVY RAINFALL WILL ALL BE POSSIBLE WITH THE THUNDERSTORM
ACTIVITY.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

THERE IS A SLIGHT CHANCE OF NON-SEVERE THUNDERSTORMS LINGERING
INTO SUNDAY MORNING. THERE ARE ALSO CHANCES FOR THUNDERSTORMS
TUESDAY INTO TUESDAY NIGHT...AND AGAIN THURSDAY INTO FRIDAY. AT
THIS TIME THE POTENTIAL FOR SEVERE IS LOW.

STRONG AND GUSTY SOUTHWESTERLY WINDS ARE POSSIBLE SUNDAY INTO
SUNDAY NIGHT. WINDS SPEEDS AND GUSTS COULD APPROACH ADVISORY
CRITERIA.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL LIKELY BE NEEDED THIS AFTERNOON INTO
TONIGHT.

IAZ004>007-015>017-023>028-034>039-046>050-059>062-072>075-083>086-
094>097-151415-
EMMET-KOSSUTH-WINNEBAGO-WORTH-PALO ALTO-HANCOCK-CERRO GORDO-
POCAHONTAS-HUMBOLDT-WRIGHT-FRANKLIN-BUTLER-BREMER-CALHOUN-WEBSTER-
HAMILTON-HARDIN-GRUNDY-BLACK HAWK-GREENE-BOONE-STORY-MARSHALL-TAMA-
DALLAS-POLK-JASPER-POWESHIEK-MADISON-WARREN-MARION-MAHASKA-CLARKE-
LUCAS-MONROE-WAPELLO-DECATUR-WAYNE-APPANOOSE-DAVIS-
909 AM CDT SAT APR 14 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL IOWA.

.DAY ONE...TODAY AND TONIGHT

THERE IS A SLIGHT RISK OF SEVERE WEATHER FOR THIS AFTERNOON INTO
TONIGHT. LARGE HAIL...DAMAGING WINDS...AN ISOLATED TORNADO...AND
LOCALLY HEAVY RAINFALL WILL ALL BE POSSIBLE WITH THE THUNDERSTORM
ACTIVITY.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

THUNDERSTORM CHANCES CONTINUE INTO SUNDAY...AND AGAIN THURSDAY
INTO FRIDAY. AT THIS TIME THE SEVERE POTENTIAL IS LOW.

STRONG AND GUSTY SOUTHWESTERLY WINDS ARE POSSIBLE SUNDAY INTO
SUNDAY NIGHT. WINDS SPEEDS AND GUSTS COULD APPROACH ADVISORY
CRITERIA.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL BE LIKELY THIS AFTERNOON INTO TONIGHT.

KS

The radar

The Des Moines radar (KDMX), 85 km away, was scanning. The volume nearest the first event began at 20:00 UTC.

Open the radar archive at this moment

Event by event

37 hail, 34 thunderstorm wind, 25 heavy rain, 4 tornado, 4 flash flood. Local standard time, as filed.

Heavy Rain, Adair

When: April 14, 2:00 PM CST to 6:00 PM CST
Where: Adair County, 2.69 mi WNW of Orient
Reported by: Trained Spotter
Coordinates: 41.210, -94.470

One and one half inches of rain before 1600 CST and an additional two and one half inches from 1600 to 1800 CST.

Hail, Adams

When: April 14, 2:00 PM CST to 2:05 PM CST
Where: Adams County, 1.48 mi NNE of Lincoln Center
Measured: 1 in hail
Property damage: $5,000
Reported by: Trained Spotter
Coordinates: 41.140, -94.870

Hail fell for about five minutes.

Thunderstorm Wind, Adams

When: April 14, 2:10 PM CST
Where: Adams County, 3.49 mi S of Mt Etna
Measured: 65 kt (75 mph) estimated gust
Property damage: $150,000
Reported by: Trained Spotter
Coordinates: 41.070, -94.740

Farm buildings were destroyed by high winds.

Thunderstorm Wind, Adams

When: April 14, 2:13 PM CST
Where: Adams County, 2.14 mi SSE of Lincoln Center
Measured: 52 kt (60 mph) estimated gust
Property damage: $25,000
Reported by: Storm Chaser
Coordinates: 41.090, -94.870

Cars were damaged with trees down. A transformer was blown. Funnel clouds were also observed.

Thunderstorm Wind, Adams

When: April 14, 2:25 PM CST
Where: Adams County, 0.52 mi W of Mt Etna
Measured: 56 kt (64 mph) estimated gust
Property damage: $10,000
Reported by: Emergency Manager
Coordinates: 41.120, -94.760

Large branches were blown down.

Hail, Cass

When: April 14, 2:27 PM CST
Where: Cass County, 1.25 mi ENE of Massena
Measured: 0.88 in hail
Reported by: Law Enforcement
Coordinates: 41.260, -94.760

Thunderstorm Wind, Adair

When: April 14, 3:00 PM CST
Where: Adair County, 0.86 mi NE of Greenfield
Measured: 69 kt (79 mph) estimated gust
Property damage: $100,000
Reported by: Emergency Manager
Coordinates: 41.310, -94.460

Damage to several trees, along with roof damage to a building.

Heavy Rain, Adair

When: April 14, 3:15 PM CST
Where: Adair County, 2.07 mi S of Arbor Hill
Reported by: Amateur Radio
Coordinates: 41.340, -94.320

Rainfall total of 1.4 inches from the first storm.

Hail, Madison

When: April 14, 3:24 PM CST
Where: Madison County, 2.36 mi E of Middle River
Measured: 1 in hail
Property damage: $1,000
Reported by: Law Enforcement
Coordinates: 41.330, -94.185

At Highway 92 and Pitzer Road.

Hail, Dallas

When: April 14, 3:25 PM CST
Where: Dallas County, 1.48 mi SSE of Dexter
Measured: 1 in hail
Property damage: $2,000
Reported by: Trained Spotter
Coordinates: 41.500, -94.220

Heavy Rain, Madison

When: April 14, 3:26 PM CST to 3:56 PM CST
Where: Madison County, 3.19 mi WNW of Winterset
Reported by: Amateur Radio
Coordinates: 41.340, -94.080

One and one half inches of rain fell in 30 minutes.

Hail, Madison

When: April 14, 3:30 PM CST
Where: Madison County, 0.52 mi W of Winterset
Measured: 1 in hail
Property damage: $1,000
Reported by: Trained Spotter
Coordinates: 41.330, -94.030

Hail, Madison

When: April 14, 3:31 PM CST
Where: Madison County, 3.19 mi WNW of Winterset
Measured: 1 in hail
Property damage: $1,000
Reported by: Amateur Radio
Coordinates: 41.340, -94.080

Thunderstorm Wind, Madison

When: April 14, 3:41 PM CST
Where: Madison County, 0.69 mi N of Winterset
Measured: 52 kt (60 mph) estimated gust
Property damage: $10,000
Reported by: Law Enforcement
Coordinates: 41.340, -94.020

Wind blew over road signs.

Heavy Rain, Polk

When: April 14, 4:00 PM CST to 7:15 PM CST
Where: Polk County, 0.69 mi N of Grimes
Reported by: Trained Spotter
Coordinates: 41.690, -93.800

Storm total rainfall of 2.75 inches as of 1915 CST with 1.9 inches falling in 45 minutes.

Hail, Warren

When: April 14, 4:14 PM CST
Where: Warren County, 0.52 mi W of Norwalk
Measured: 0.88 in hail
Reported by: Trained Spotter
Coordinates: 41.480, -93.690

Hail, Polk

When: April 14, 4:19 PM CST to 4:37 PM CST
Where: Polk County, (Dsm)des Moines Intl
Measured: 1 in hail
Property damage: $10,000
Reported by: Trained Spotter
Coordinates: 41.530, -93.670

Report from the Des Moines International Airport that hail fell from 1619-1637 CDT with the largest being an inch in diameter.

Hail, Warren

When: April 14, 4:21 PM CST
Where: Warren County, 0.69 mi N of Norwalk
Measured: 1 in hail
Property damage: $2,000
Reported by: Trained Spotter
Coordinates: 41.490, -93.680

Hail, Polk

When: April 14, 4:25 PM CST
Where: Polk County, 1.38 mi S of Des Moines
Measured: 1 in hail
Property damage: $2,000
Reported by: Trained Spotter
Coordinates: 41.580, -93.620

Hail, Polk

When: April 14, 4:27 PM CST
Where: Polk County, 1.25 mi ESE of Ft Des Moines
Measured: 1 in hail
Property damage: $5,000
Reported by: Trained Spotter
Coordinates: 41.526, -93.606

Located at Army Post Road and SE 5th ST.

Hail, Polk

When: April 14, 4:30 PM CST
Where: Polk County, 1.03 mi SE of Des Moines
Measured: 0.88 in hail
Reported by: Public
Coordinates: 41.591, -93.604

Pea to nickel size hail at the Capitol Building.

Thunderstorm Wind, Cass

When: April 14, 5:44 PM CST
Where: Cass County, 0.52 mi E of Atlantic
Measured: 52 kt (60 mph) estimated gust
Property damage: $10,000
Reported by: Public
Coordinates: 41.400, -95.010

Shingles were blown off of a house. Small branches were broken off.

Hail, Clarke

When: April 14, 5:47 PM CST
Where: Clarke County, 1.25 mi ESE of Murray
Measured: 0.88 in hail
Reported by: Public
Coordinates: 41.040, -93.950

Mainly pea to dime size hail with some nickel hail.

Hail, Clarke

When: April 14, 5:47 PM CST
Where: Clarke County, 3.71 mi W of Osceola Muni Arpt
Measured: 1 in hail
Property damage: $1,000
Reported by: Trained Spotter
Coordinates: 41.080, -93.840

Hail, Union

When: April 14, 5:47 PM CST
Where: Union County, 0.87 mi SW of Creston
Measured: 1 in hail
Property damage: $10,000
Reported by: Law Enforcement
Coordinates: 41.060, -94.380

Nickel to quarter size hail.

Hail, Clarke

When: April 14, 5:50 PM CST
Where: Clarke County, 3.64 mi W of Jamison
Measured: 1 in hail
Property damage: $1,000
Reported by: Trained Spotter
Coordinates: 41.130, -93.800

Tornado, Adams

When: April 14, 5:52 PM CST to 5:53 PM CST
Where: Adams County, 6.1 mi NE of Stringtown to 6.62 mi NE of Stringtown
Rating: EF1
Path length: 0.54 mi
Path width: 75 yd
Continued into: Union, Ia (DMX)
Property damage: $50,000
Reported by: NWS Storm Survey
Coordinates: 41.027, -94.481

Tornado developed about one half mile west of the Adams/Union county line in Adams county. The tornado did EF1 damage to a farmstead shortly after developing. Shortly thereafter, the tornado continued into Union county.

Flash Flood, Cass

When: April 14, 5:53 PM CST to 9:00 PM CST
Where: Cass County, 0.8 mi SSW of Atlantic to 1.87 mi NNW of Atlantic
Cause: Heavy Rain
Property damage: $10,000
Reported by: Emergency Manager
Coordinates: 41.389, -95.027

Flash flooding reported in Atlantic with water at least 18 inches deep covering the roads.

Tornado, Union

When: April 14, 5:53 PM CST to 6:19 PM CST
Where: Union County, 0.07 mi WNW of Cromwell to 6.86 mi W of Lorimor
Rating: EF2
Path length: 16.05 mi
Path width: 800 yd
Injuries: 2 direct, 0 indirect
Property damage: $5.0 million
Reported by: NWS Storm Survey
Coordinates: 41.030, -94.471

This tornado continued in from Adams county. NWS storm survey confirmed a strong EF2 tornado. It entered Union county just southwest of Cromwell and tracked east-northeast through the far northwest portion of Creston. The Greater Regional Medical Center and Southwest Community College sustained EF2 damage with the worst occurring to the Green Hills Education Center. The tornado continued tracking northeast and damaged a few farmsteads northeast of Creston.

Hail, Warren

When: April 14, 5:54 PM CST
Where: Warren County, 1.04 mi W of New Virginia
Measured: 1.25 in hail
Property damage: $5,000
Reported by: Trained Spotter
Coordinates: 41.180, -93.750

Thunderstorm Wind, Adams

When: April 14, 5:55 PM CST
Where: Adams County, 0.62 mi NNE of Stringtown
Measured: 56 kt (64 mph) estimated gust
Property damage: $10,000
Reported by: State Official
Coordinates: 40.978, -94.566

Large tree blown down and over the road near intersection of highway 49 and 34.

Hail, Union

When: April 14, 5:57 PM CST
Where: Union County, 2.5 mi ESE of Cromwell
Measured: 1 in hail
Property damage: $1,000
Reported by: Amateur Radio
Coordinates: 41.010, -94.430

Hail, Warren

When: April 14, 6:00 PM CST
Where: Warren County, New Virginia
Measured: 1.25 in hail
Property damage: $5,000
Reported by: Public
Coordinates: 41.180, -93.730

Measured 1.2 inch diameter after a few minutes of melting.

Hail, Warren

When: April 14, 6:00 PM CST
Where: Warren County, 1.48 mi SSW of St Marys
Measured: 0.88 in hail
Reported by: Trained Spotter
Coordinates: 41.300, -93.740

Thunderstorm Wind, Union

When: April 14, 6:04 PM CST
Where: Union County, 0.87 mi SE of Creston
Measured: 69 kt (79 mph) estimated gust
Property damage: $250,000
Reported by: Amateur Radio
Coordinates: 41.060, -94.360

Twenty inch tree down with other large trees uprooted.

Hail, Union

When: April 14, 6:09 PM CST
Where: Union County, 0.87 mi SE of Creston
Measured: 0.75 in hail
Reported by: Trained Spotter
Coordinates: 41.060, -94.360

Winds of 40 to 50 MPH with the hail.

Hail, Union

When: April 14, 6:20 PM CST
Where: Union County, 3.45 mi N of Talmage
Measured: 1.75 in hail
Property damage: $10,000
Reported by: Law Enforcement
Coordinates: 41.080, -94.120

Hail, Clarke

When: April 14, 6:29 PM CST
Where: Clarke County, 1.25 mi ESE of Murray
Measured: 2.75 in hail
Property damage: $50,000
Reported by: Trained Spotter
Coordinates: 41.040, -93.950

Thunderstorm Wind, Madison

When: April 14, 6:30 PM CST
Where: Madison County, 1.14 mi W of Winterset
Measured: 52 kt (60 mph) estimated gust
Reported by: Trained Spotter
Coordinates: 41.330, -94.042

Estimated winds at intersection of Highway 169 and 92 west of Winterset.

Hail, Clarke

When: April 14, 6:30 PM CST
Where: Clarke County, 2.2 mi WSW of Osceola
Measured: 1 in hail
Property damage: $3,000
Reported by: Trained Spotter
Coordinates: 41.020, -93.820

Dime to quarter size hail along with 1.67 inches of rain in 20 minutes.

Hail, Clarke

When: April 14, 6:37 PM CST
Where: Clarke County, 2.09 mi NW of Osceola Muni Arpt
Measured: 0.88 in hail
Reported by: Trained Spotter
Coordinates: 41.090, -93.800

Thunderstorm Wind, Dallas

When: April 14, 6:39 PM CST
Where: Dallas County, 0.86 mi NW of Ortonville
Measured: 61 kt (70 mph) estimated gust
Property damage: $25,000
Reported by: Trained Spotter
Coordinates: 41.630, -93.980

Trained spotter estimated winds gusting to 70 MPH.

Thunderstorm Wind, Clarke

When: April 14, 6:39 PM CST
Where: Clarke County, 2.09 mi NW of Osceola Muni Arpt
Measured: 52 kt (60 mph) estimated gust
Property damage: $5,000
Reported by: Trained Spotter
Coordinates: 41.090, -93.800

Winds were estimated to be around 60 MPH.

Thunderstorm Wind, Dallas

When: April 14, 6:40 PM CST
Where: Dallas County, 0.86 mi NW of Ortonville
Measured: 56 kt (64 mph) estimated gust
Property damage: $25,000
Reported by: Amateur Radio
Coordinates: 41.630, -93.980

Twelve to thirteen inch diameter trees snapped at the base.

Thunderstorm Wind, Dallas

When: April 14, 6:44 PM CST
Where: Dallas County, 4.03 mi SSE of Hadden Hill
Measured: 52 kt (60 mph) estimated gust
Property damage: $25,000
Reported by: Trained Spotter
Coordinates: 41.570, -93.790

Reported north of Jordan Creek Mall.

Thunderstorm Wind, Polk

When: April 14, 6:45 PM CST to 6:55 PM CST
Where: Polk County, 2.18 mi ESE of Ankeny
Measured: 56 kt (64 mph) estimated gust
Property damage: $10,000
Reported by: Trained Spotter
Coordinates: 41.720, -93.580

Winds of 60 to 65 MPH lasted about 10 minutes.

Hail, Clarke

When: April 14, 6:46 PM CST
Where: Clarke County, 0.87 mi SE of Osceola Muni Arpt
Measured: 1 in hail
Property damage: $5,000
Reported by: Trained Spotter
Coordinates: 41.060, -93.760

Along with 50 to 60 MPH southwest winds.

Thunderstorm Wind, Polk

When: April 14, 6:48 PM CST to 7:00 PM CST
Where: Polk County, 0.3 mi NNE of Windsor Hgts
Measured: 55 kt (63 mph) measured gust
Property damage: $2,000
Reported by: NWS Employee
Coordinates: 41.604, -93.718

Measured by NWS employee.

Thunderstorm Wind, Polk

When: April 14, 6:50 PM CST
Where: Polk County, 1.38 mi S of Des Moines
Measured: 52 kt (60 mph) estimated gust
Property damage: $10,000
Reported by: Trained Spotter
Coordinates: 41.580, -93.620

Power lines were down with four to five inches of running water in the streets.

Thunderstorm Wind, Polk

When: April 14, 6:50 PM CST
Where: Polk County, 0.69 mi N of Lovington
Measured: 50 kt (58 mph) estimated gust
Property damage: $2,000
Reported by: Trained Spotter
Coordinates: 41.660, -93.700

Small trees were blown over.

Thunderstorm Wind, Polk

When: April 14, 6:51 PM CST
Where: Polk County, 1.38 mi S of Des Moines
Measured: 56 kt (64 mph) measured gust
Property damage: $50,000
Reported by: Mesonet
Coordinates: 41.580, -93.620

South wind of 65 MPH was measured at the Blank Park Zoo.

Thunderstorm Wind, Clarke

When: April 14, 6:51 PM CST
Where: Clarke County, 0.52 mi W of Osceola
Measured: 52 kt (60 mph) estimated gust
Property damage: $5,000
Reported by: Trained Spotter
Coordinates: 41.030, -93.790

Estimated winds of 60 MPH.

Thunderstorm Wind, Polk

When: April 14, 6:53 PM CST
Where: Polk County, 1.95 mi W of Capitol Hgts
Measured: 52 kt (60 mph) estimated gust
Property damage: $10,000
Reported by: Trained Spotter
Coordinates: 41.615, -93.587

Ten inch diameter limbs were down along east 18th street.

Thunderstorm Wind, Polk

When: April 14, 6:53 PM CST
Where: Polk County, 1.24 mi SE of Ashawa
Measured: 52 kt (60 mph) estimated gust
Property damage: $20,000
Reported by: Fire Department/Rescue
Coordinates: 41.570, -93.750

Three to eight inch tree limbs down at Valley Junction.

Tornado, Warren

When: April 14, 6:54 PM CST to 6:56 PM CST
Where: Warren County, 2.67 mi WNW of Medora to 1.92 mi WNW of Medora
Rating: EF1
Path length: 0.85 mi
Path width: 75 yd
Property damage: $200,000
Reported by: NWS Storm Survey
Coordinates: 41.188, -93.670

Brief EF1 tornado confirmed by NWS damage survey. The tornado touched down three miles east of New Virginia and tracked about a mile to the east-northeast before dissipating. The tornado severely damaged several farm outbuildings and flipped several camper trailers. Wind speeds were estimated around 100 MPH.

Thunderstorm Wind, Polk

When: April 14, 6:58 PM CST
Where: Polk County, 1.38 mi S of Des Moines
Measured: 52 kt (60 mph) estimated gust
Property damage: $5,000
Reported by: Trained Spotter
Coordinates: 41.580, -93.620

Tree limbs were blown down by high winds.

Thunderstorm Wind, Polk

When: April 14, 6:59 PM CST
Where: Polk County, 0.86 mi NE of Johnston
Measured: 52 kt (60 mph) estimated gust
Property damage: $5,000
Reported by: Trained Spotter
Coordinates: 41.680, -93.690

Small branches broken off with minor street flooding.

Thunderstorm Wind, Polk

When: April 14, 7:00 PM CST
Where: Polk County, 0.86 mi SE of West Des Moines
Measured: 57 kt (66 mph) estimated gust
Property damage: $100,000
Reported by: Fire Department/Rescue
Coordinates: 41.570, -93.710

Most of the roof torn away on a commercial building.

Thunderstorm Wind, Polk

When: April 14, 7:02 PM CST
Where: Polk County, 0.52 mi W of Lovington
Measured: 52 kt (60 mph) estimated gust
Property damage: $5,000
Reported by: Trained Spotter
Coordinates: 41.650, -93.710

Estimated winds of 60 MPH.

Thunderstorm Wind, Polk

When: April 14, 7:02 PM CST
Where: Polk County, 1.38 mi SW of Des Moines
Measured: 57 kt (66 mph) estimated gust
Property damage: $100,000
Reported by: Public
Coordinates: 41.588, -93.641

Large trees down near 18th and Woodland in the Sherman Hoyt area. Significant tree damage.

Flash Flood, Madison

When: April 14, 7:07 PM CST to 7:45 PM CST
Where: Madison County, 2.88 mi SSE of Winterset to 5.4 mi NNE of Winterset Arpt
Cause: Heavy Rain
Property damage: $10,000
Reported by: Law Enforcement
Coordinates: 41.289, -94.009

Widespread flash flooding in Madison County. Some roads under water, especially west, south, and north of Winterset.

Flash Flood, Polk

When: April 14, 7:15 PM CST to 9:30 PM CST
Where: Polk County, 1.59 mi N of Swanwood to 2.07 mi NNW of Swanwood
Cause: Heavy Rain
Property damage: $25,000
Reported by: Trained Spotter
Coordinates: 41.703, -93.577

Twelve to 18 inches of water flowing across Delaware Ave north of Oralabor Rd.

Flash Flood, Polk

When: April 14, 7:20 PM CST to 9:30 PM CST
Where: Polk County, 0.86 mi NW of Oralabor to 1.72 mi WSW of Oralabor
Cause: Heavy Rain
Property damage: $25,000
Reported by: Trained Spotter
Coordinates: 41.740, -93.640

Street flooding reported with one to two feet in Ankeny near the HyVee and High School by 1st street.

Hail, Lucas

When: April 14, 7:21 PM CST
Where: Lucas County, 0.52 mi E of Lucas
Measured: 1.75 in hail
Property damage: $25,000
Reported by: Trained Spotter
Coordinates: 41.030, -93.460

Thunderstorm Wind, Jasper

When: April 14, 7:23 PM CST
Where: Jasper County, Reasnor
Measured: 57 kt (66 mph) estimated gust
Property damage: $50,000
Reported by: Trained Spotter
Coordinates: 41.580, -93.020

A steel shed was blown away by high winds.

Thunderstorm Wind, Jasper

When: April 14, 7:28 PM CST
Where: Jasper County, 2.32 mi NNW of Killduff
Measured: 65 kt (75 mph) estimated gust
Property damage: $75,000
Reported by: Trained Spotter
Coordinates: 41.630, -92.940

Siding was ripped off a house. Small hail also reported.

Thunderstorm Wind, Marion

When: April 14, 7:29 PM CST
Where: Marion County, Knoxville
Measured: 57 kt (66 mph) estimated gust
Property damage: $75,000
Reported by: Trained Spotter
Coordinates: 41.320, -93.100

Trees were blown down along with dime size hail reported.

Hail, Lucas

When: April 14, 7:29 PM CST
Where: Lucas County, Chariton
Measured: 1 in hail
Property damage: $50,000
Reported by: Trained Spotter
Coordinates: 41.020, -93.320

Quarter size hail along with estimated 60 MPH wind gusts.

Thunderstorm Wind, Marion

When: April 14, 7:30 PM CST
Where: Marion County, 2.5 mi WSW of Pershing
Measured: 69 kt (79 mph) estimated gust
Property damage: $100,000
Reported by: Emergency Manager
Coordinates: 41.250, -93.060

Garage attached to a house was destroyed with part of the roof of the house taken off. Debris from the house strewn east from the house about 100 yards. Garage door faced west and looks to have failed first.

Thunderstorm Wind, Marion

When: April 14, 7:35 PM CST
Where: Marion County, 3.61 mi SSE of Knoxville Arpt
Measured: 69 kt (79 mph) estimated gust
Property damage: $100,000
Reported by: Emergency Manager
Coordinates: 41.250, -93.100

Roof blown off of a house with the garage blown down.

Hail, Marion

When: April 14, 7:45 PM CST
Where: Marion County, 0.86 mi SE of Pella
Measured: 0.75 in hail
Reported by: Trained Spotter
Coordinates: 41.410, -92.920

Pea to dime size hail and minor street flooding.

Thunderstorm Wind, Poweshiek

When: April 14, 7:50 PM CST
Where: Poweshiek County, 1.03 mi W of Searsboro
Measured: 52 kt (60 mph) estimated gust
Property damage: $5,000
Reported by: Trained Spotter
Coordinates: 41.580, -92.720

Estimated 60 MPH winds.

Hail, Monroe

When: April 14, 7:55 PM CST
Where: Monroe County, 1.25 mi ENE of Lovilia
Measured: 1 in hail
Property damage: $5,000
Reported by: Trained Spotter
Coordinates: 41.140, -92.910

Quarter size hail partially covering the ground.

Hail, Monroe

When: April 14, 8:00 PM CST
Where: Monroe County, 4.33 mi NE of Avery
Measured: 2.5 in hail
Property damage: $25,000
Reported by: Trained Spotter
Coordinates: 41.120, -92.680

Hail, Monroe

When: April 14, 8:02 PM CST
Where: Monroe County, 2.69 mi ENE of Hiteman
Measured: 1 in hail
Property damage: $2,000
Reported by: Trained Spotter
Coordinates: 41.080, -92.870

Hail, Wapello

When: April 14, 8:05 PM CST
Where: Wapello County, 0.69 mi S of Eddyville
Measured: 1.5 in hail
Property damage: $15,000
Reported by: Trained Spotter
Coordinates: 41.160, -92.630

Hail, Mahaska

When: April 14, 8:07 PM CST
Where: Mahaska County, 4.88 mi ESE of Truax
Measured: 1.75 in hail
Property damage: $15,000
Reported by: Trained Spotter
Coordinates: 41.160, -92.640

Hail, Mahaska

When: April 14, 8:07 PM CST
Where: Mahaska County, 1.25 mi WNW of Oskaloosa
Measured: 1 in hail
Property damage: $50,000
Reported by: Trained Spotter
Coordinates: 41.310, -92.670

Quarter size hail and winds of 60 to 70 MPH.

Hail, Mahaska

When: April 14, 8:10 PM CST
Where: Mahaska County, 0.52 mi W of Oskaloosa
Measured: 0.75 in hail
Reported by: Trained Spotter
Coordinates: 41.300, -92.660

Strong winds accompanied the hail.

Thunderstorm Wind, Mahaska

When: April 14, 8:15 PM CST
Where: Mahaska County, 0.86 mi SE of Oskaloosa
Measured: 52 kt (60 mph) estimated gust
Property damage: $5,000
Reported by: Trained Spotter
Coordinates: 41.290, -92.640

Estimated winds of 60 MPH along with pea size hail.

Tornado, Mahaska

When: April 14, 8:22 PM CST to 8:24 PM CST
Where: Mahaska County, 1.08 mi E of Wright to 1.56 mi NNE of Oskaloosa Muni Arpt
Rating: EF1
Path length: 1.27 mi
Path width: 90 yd
Property damage: $75,000
Reported by: NWS Storm Survey
Coordinates: 41.250, -92.509

The tornado was determined to be an EF1 with a broad and intense rear flank downdraft south of the track. Peak wind was around 100 MPH.

Thunderstorm Wind, Mahaska

When: April 14, 8:22 PM CST
Where: Mahaska County, 0.52 mi E of Oskaloosa Muni Arpt
Measured: 84 kt (97 mph) measured gust
Property damage: $200,000
Reported by: AWOS
Coordinates: 41.230, -92.490

RFD winds measured by AWOS site at the airport. Hangar doors and buildings damaged.

Hail, Wapello

When: April 14, 8:40 PM CST
Where: Wapello County, 2.95 mi SSE of Highland Center
Measured: 0.88 in hail
Reported by: Trained Spotter
Coordinates: 41.090, -92.330

Nickel size hail and heavy rain.

Heavy Rain, Jasper

When: April 15, 6:00 AM CST
Where: Jasper County, 0.52 mi W of Prairie City
Reported by: Mesonet
Coordinates: 41.600, -93.240

Rainfall of 2.21 inches in 24 hours.

Heavy Rain, Union

When: April 15, 6:00 AM CST
Where: Union County, 0.52 mi E of Lorimor
Reported by: COOP Observer
Coordinates: 41.130, -94.060

Rainfall of 2.45 inches in 24 hours.

Heavy Rain, Jasper

When: April 15, 6:00 AM CST
Where: Jasper County, 1.38 mi N of Turner
Reported by: COOP Observer
Coordinates: 41.720, -92.820

Rainfall of 3.50 inches in 24 hours.

Heavy Rain, Madison

When: April 15, 6:00 AM CST
Where: Madison County, 0.69 mi N of Winterset
Reported by: COOP Observer
Coordinates: 41.340, -94.020

Rainfall of 2.88 inches in 24 hours.

Heavy Rain, Story

When: April 15, 6:00 AM CST
Where: Story County, 0.69 mi S of Ames Arpt
Reported by: ASOS
Coordinates: 41.990, -93.620

Rainfall of 2.78 inches in 24 hours.

Heavy Rain, Polk

When: April 15, 6:00 AM CST
Where: Polk County, 2.07 mi S of Polk City
Reported by: Official NWS Observations
Coordinates: 41.740, -93.720

Rainfall of 3.18 inches in 24 hours.

Heavy Rain, Calhoun

When: April 15, 6:00 AM CST
Where: Calhoun County, Rockwell City
Reported by: COOP Observer
Coordinates: 42.400, -94.630

Rainfall of 2.72 inches in 24 hours.

Heavy Rain, Lucas

When: April 15, 6:00 AM CST
Where: Lucas County, 0.52 mi E of Chariton Muni Arpt
Reported by: COOP Observer
Coordinates: 41.020, -93.360

Rainfall of 2.17 inches in 24 hours.

Heavy Rain, Clarke

When: April 15, 6:00 AM CST
Where: Clarke County, 0.52 mi E of Osceola
Reported by: AWOS
Coordinates: 41.030, -93.770

Rainfall of 2.43 inches in 24 hours.

Heavy Rain, Polk

When: April 15, 6:00 AM CST
Where: Polk County, 0.52 mi E of (Dsm)des Moines Intl
Reported by: ASOS
Coordinates: 41.530, -93.660

Rainfall of 3.66 inches in 24 hours.

Heavy Rain, Cass

When: April 15, 6:00 AM CST
Where: Cass County, 0.52 mi E of Massena
Reported by: COOP Observer
Coordinates: 41.250, -94.770

Rainfall of 3.28 inches in 24 hours.

Heavy Rain, Cass

When: April 15, 6:00 AM CST
Where: Cass County, 0.86 mi NW of Atlantic Arpt
Reported by: AWOS
Coordinates: 41.410, -95.060

Rainfall of 2.64 inches in 24 hours.

Heavy Rain, Adair

When: April 15, 6:00 AM CST
Where: Adair County, 0.52 mi E of Adair
Reported by: COOP Observer
Coordinates: 41.500, -94.640

Rainfall of 2.40 inches in 24 hours.

Heavy Rain, Tama

When: April 15, 6:00 AM CST
Where: Tama County, 0.86 mi SW of Traer Muni Arpt
Reported by: COOP Observer
Coordinates: 42.190, -92.460

Rainfall of 3.00 inches in 24 hours.

Heavy Rain, Story

When: April 15, 6:00 AM CST
Where: Story County, 0.69 mi N of Maxwell
Reported by: COOP Observer
Coordinates: 41.890, -93.400

Rainfall of 2.50 inches in 24 hours.

Heavy Rain, Marshall

When: April 15, 6:00 AM CST
Where: Marshall County, 0.86 mi SE of Marshalltown
Reported by: COOP Observer
Coordinates: 42.040, -92.910

Rainfall of 2.50 inches in 24 hours.

Heavy Rain, Polk

When: April 15, 6:00 AM CST
Where: Polk County, 0.86 mi NE of Swanwood
Reported by: AWOS
Coordinates: 41.690, -93.570

Rainfall of 2.86 inches in 24 hours.

Heavy Rain, Tama

When: April 15, 6:00 AM CST
Where: Tama County, 0.69 mi S of Garwin
Reported by: COOP Observer
Coordinates: 42.090, -92.680

Rainfall of 3.39 inches in 24 hours.

Heavy Rain, Boone

When: April 15, 6:00 AM CST
Where: Boone County, 1.38 mi S of Boone
Reported by: COOP Observer
Coordinates: 42.050, -93.880

Rainfall of 2.05 inches in 24 hours.

Heavy Rain, Guthrie

When: April 15, 6:00 AM CST
Where: Guthrie County, Guthrie Center
Reported by: COOP Observer
Coordinates: 41.680, -94.500

Rainfall of 2.52 inches in 24 hours.

Heavy Rain, Polk

When: April 15, 6:00 AM CST
Where: Polk County, Windsor Hgts
Reported by: NWS Employee
Coordinates: 41.600, -93.720

Rainfall of 2.27 inches in 24 hours.

What these are

Heavy Rain: Rainfall totals unusual for the place and season that did not produce a flood.
Hail: Hail three-quarters of an inch or larger, or smaller hail that caused damage, filed with the largest stone measured.
Thunderstorm Wind: Winds from a thunderstorm of 50 knots (58 mph) or more, or lower winds that caused damage or casualties. Measured gusts are marked MG, estimated EG.
Tornado: A violently rotating column of air in contact with the ground and extending from a thunderstorm, filed with its path, width and Fujita or Enhanced Fujita rating from the damage survey.
Flash Flood: Flooding that begins within six hours of the rain that causes it, or of a dam or levee failure or ice jam release, often with deadly speed.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

Every storm in Iowa in 2012 Every state in 2012 This day in weather history The tornado archive for Iowa, 2012 Warnings in Iowa, April 2012

Sources

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: 365270, 365320, 365297, 365314, 365299, 365321, 365313, 365284, 365322, 365323, 365269, 365324, 365325, 365298, 365271, 365326, 365327, 365328, 365331, 365329, 365330, 365300, 365332, 365335, 365344, 365334, 366995, 365265, 365281, 365333, 365302, 365337, 365339, 365352, 365303, 365340, 365338, 365341, 365289, 365350, and more.