Alert archive / Iowa / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 139, NWS Des Moines, IA

July 25, 20124 counties in Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jul 25, 2012, 7:23 PM CDT for 4 counties in Iowa. It was in force for 37 min. 12 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jul 25, 2012, 7:23 PM CDT (00:23 UTC)
Expired: Jul 25, 2012, 8:00 PM CDT
In force: 37 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Calhoun County, IA, Carroll County, IA, Greene County, IA, Sac County, IA

The radar

The Des Moines radar (KDMX), 104 km from the middle of the area, began a volume at 00:23 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

Time	Report	Where	Remark
Jul 25, 7:30 PM CDT	NON-TSTM WND GST 68	Carroll, IA	MEASURED BY IOWA DOT RWIS SITE ON US 30.
Jul 25, 7:35 PM CDT	TSTM WND GST 61	Carroll Airport, IA	FROM IDOT AWOS SITE.
Jul 25, 7:37 PM CDT	TSTM WND DMG	Carroll, IA	WIDESPREAD DAMAGE THROUGHOUT THE TOWN OF CARROLL. NUMEROUS BRANCHES...POWER LINES...AND STREETS SIGNS DOWN. FROM WEATHER-EYE-RADIO. TIME ESTIMATED BY RADAR.
Jul 25, 7:37 PM CDT	TSTM WND DMG	Glidden, IA	SMALL LIMBS BREAKING. ESTIMATED 50 MPH WINDS.
Jul 25, 7:40 PM CDT	TSTM WND GST 60	Breda, IA	MULTIPLE TREE BRANCHES DOWN THROUGHOUT THE TOWN OF BREDA...GENERALLY 1 INCH IN DIAMETER.
Jul 25, 7:46 PM CDT	TSTM WND DMG	Lohrville, IA	BIG LIMBS DOWN EVERYWHERE. CASEYS DIESEL PUMP BLOWN OVER AND LAYING ON ITS SIDE. TREE LAYING ON TOP OF CAR. CROP DAMAGE. TIME ESTIMATED. FROM KCHA RADIO.
Jul 25, 7:48 PM CDT	TSTM WND GST 63	5 Wnw Carroll Airport, IA	FROM KCCI TV SCHOOLNET SITE
Jul 25, 7:50 PM CDT	TSTM WND DMG	Rockwell City, IA	BRANCHES AND POWER LINES DOWN.
Jul 25, 7:55 PM CDT	TSTM WND GST 75	Carroll, IA	POWERLINES DOWN IN CARROLL. LARGE BRANCHES CAUSED DAMAGED TO A HOUSE AND PORCH IN CARROLL.
Jul 25, 7:55 PM CDT	TSTM WND GST 75	Lanesboro, IA	POWERLINES DOWN.
Jul 25, 8:00 PM CDT	TSTM WND DMG	3 N Arcadia, IA	A FEW 3 FOOT DIAMETER TREES DOWN. A 30 FOOT LONG CAMPER ATTACHED TO A TRUCK BLOWN OVER. SEVERAL CROPS DAMAGED. TIME ESTIMATED BY RADAR.
Jul 25, 8:10 PM CDT	TSTM WND DMG	5 N Carroll Airport, IA	MULTIPLE 4 TO 6 INCH DIAMETER BRANCHES DOWN. NO STRUCTURAL DAMAGE.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched 10 storm reports to this severe thunderstorm warning; the first came 12 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 25, 5:16 PM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 0.4 hours before the alert went out and 166 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 1750 J/kg
Mixed-layer CIN: -81 J/kg
Mixed-layer LCL: 2262 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 19 m²/s²
0-3 km storm-relative helicity: 52 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

455 
WUUS53 KDMX 260023
SVRDMX
IAC025-027-073-161-260100-
/O.NEW.KDMX.SV.W.0139.120726T0023Z-120726T0100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
723 PM CDT WED JUL 25 2012

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN CALHOUN COUNTY IN WEST CENTRAL IOWA...
  NORTHERN CARROLL COUNTY IN WEST CENTRAL IOWA...
  NORTHWESTERN GREENE COUNTY IN WEST CENTRAL IOWA...
  SOUTHEASTERN SAC COUNTY IN WEST CENTRAL IOWA...

* UNTIL 800 PM CDT

* AT 718 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH.  THIS STORM WAS LOCATED 7 MILES SOUTH OF LAKE VIEW...OR
  11 MILES NORTHWEST OF CARROLL...AND MOVING EAST AT 40 MPH.

* LOCATIONS IMPACTED INCLUDE...
  CARROLL...GLIDDEN...LAKE CITY...ROCKWELL CITY...JEFFERSON...
  AUBURN...YETTER...CARROLL AIRPORT...LIDDERDALE...LANESBORO...
  RALSTON...SCRANTON...LOHRVILLE...CHURDAN...RINARD...FARNHAMVILLE...
  SOMERS AND KNIERIM.

WINDS MAY GUST FAR AHEAD OF THE RAIN WITH THIS STORM...SO BE 
PREPARED TO TAKE SHELTER EARLY. WINDS GUSTED UP TO 60 MPH IN DENISON 
PREVIOUSLY WITH THIS STORM.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

WIDESPREAD DESTRUCTIVE WIND DAMAGE EXPECTED...THIS IS A DANGEROUS
STORM. IMMEDIATELY GO TO A BASEMENT OR SMALL INTERIOR ROOM...AWAY
FROM WINDOWS. EXTENSIVE DAMAGE AND INJURY ARE LIKELY. EVACUATE MOBILE
HOMES...AND SEEK SHELTER IN A REINFORCED BUILDING. WIDESPREAD
DESTRUCTIVE WINDS CAN PRODUCE DAMAGE AND SERIOUS INJURY SIMILAR TO A
TORNADO.

&&

LAT...LON 4239 9512 4247 9439 4221 9440 4221 9437
      4198 9436 4201 9509 4221 9509 4221 9511
TIME...MOT...LOC 0022Z 265DEG 35KT 4221 9494
WIND...HAIL 60MPH <.75IN

$$

JUNGBLUTH

1 follow-up statement

941 
WWUS53 KDMX 260043
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
743 PM CDT WED JUL 25 2012

IAC025-027-073-161-260100-
/O.CON.KDMX.SV.W.0139.000000T0000Z-120726T0100Z/
SAC IA-GREENE IA-CALHOUN IA-CARROLL IA-
743 PM CDT WED JUL 25 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHERN
CARROLL...SOUTHERN CALHOUN...NORTHWESTERN GREENE AND SOUTHEASTERN SAC
COUNTIES UNTIL 800 PM CDT...

AT 736 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
FROM 6 MILES NORTH OF LAKE CITY TO 8 MILES SOUTHEAST OF GLIDDEN...
MOVING EAST AT 50 MPH.

THESE WINDS ARE OCCURING ALMOST 10 MILES AHEAD OF THE RAIN WITH THE 
THUNDERSTORMS. WINDS OF 50 MPH AND SMALL LIMBS BREAKING WERE 
REPORTED IN GLIDDEN AT 737 PM.  

A SECOND ROUND OF DAMAGING WINDS IS POSSIBLE BETWEEN BREDA...LAKE 
VIEW AND LAKE CITY. THESE WINDS ARE OCCURING WITH THE RAINL

LOCATIONS IMPACTED INCLUDE...
  ROCKWELL CITY...JEFFERSON...LOHRVILLE...CHURDAN...RINARD...
  FARNHAMVILLE...KNIERIM AND SOMERS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PREPARE FOR DAMAGING WINDS...FALLING TREES AND FLYING DEBRIS. MOVE
INDOORS AND STAY AWAY FROM WINDOWS. IF YOU ARE IN A MOBILE HOME...GET
OUT NOW...AND SEEK SHELTER IN A REINFORCED BUILDING.

&&

LAT...LON 4239 9512 4247 9439 4221 9440 4221 9437
      4198 9436 4201 9509 4221 9509 4221 9511
TIME...MOT...LOC 0040Z 265DEG 44KT 4235 9470 4200 9454
WIND...HAIL 60MPH <.75IN

$$

JUNGBLUTH

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, 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 this severe thunderstorm warning went out at Jul 25, 6:45 PM CDT, 38 minutes earlier.

Area forecast discussion, Jul 25, 6:45 PM CDT, 38 minutes before

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE DES MOINES IA
645 PM CDT WED JUL 25 2012

.UPDATED FOR 26/00Z AVIATION DISCUSSION...

.SHORT TERM /TONIGHT/...
MAIN FORECAST CONCERN IS WITH TIMING OF COLD FRONT AND CONVECTION
POTENTIAL THIS EVENING INTO THE OVERNIGHT HOURS. NAM/RAP SEEM TO
HAVE A DECENT HANDLE ON INITIATION OF CONVECTION AND LEANED TOWARD
TIMING OF FRONT/POPS. THE 16Z HRRR HAS SOME ISOLATED CONVECTION
DEVELOPING B/T 22-00Z BUT THINKING CAP IS STILL TOO STRONG FOR MUCH
CONVECTION TO GET GOING UNTIL AFTER 00Z. REALLY CUT BACK ON POPS
UNTIL AFTER 00Z OVER THE CENTRAL AND SOUTHEAST CWA. THE 12Z 4.0KM
WRF MODEL RUNS FROM NSSL AND NCEP BOTH HAVE VERY SPOTTY PRECIP
THROUGH TONIGHT...AND SORT OF LIGHTS UP THE FRONT SOUTH OF
INTERSTATE 80 AFTER 02Z THURSDAY. HAVE LOW CONFIDENCE WITH ANY
WIDESPREAD SIGNIFICANT CONVECTION TONIGHT. MODELS FORECASTING PW
VALUES NEAR 2 INCHES GENERALLY ALONG THE FRONT...AND 1-1.5 INCHES
BEHIND IT. HOWEVER...WITH SUCH SPOTTY CONVECTION AND LOWERED QPF
AMOUNTS TO LESS THAN A HALF INCH THROUGHOUT THE FORECAST
AREA...ESPECIALLY WITH SUCH HIGH BASED CONVECTION. PLENTY OF SURFACE
BASED INSTABILITY...BUT LITTLE IF ANY EFFECTIVE SHEAR AVAILABLE...AS
WELL AS FORCING OTHER THAN THE FRONTAL BOUNDARY TONIGHT. THINKING
MAIN SEVERE THREAT WILL BE WINDS WITH THE DRY AIRMASS PRESENT.

.LONG TERM /THURSDAY THROUGH WEDNESDAY/...
LARGE SCALE MAINLY POST FRONTAL FORCING SHOULD BE JUST EXITING
FORECAST AREA BY THE START OF THE PERIOD SO ANY LINGERING
PRECIP...IF ANY...SHOULD BE MOVING INTO MO AND IL.  FORECAST DRY
AFTER 15Z.  PREVIOUS FORECAST HAD LOW POPS BRUSHING NERN IA BY LATE
AFTERNOON BUT CANNOT REALLY FIND ANY SUPPORT FOR THIS WITH LIMITED
FORCING AND INSUFFICIENT MOISTURE...AND EVEN THAT LOOKS TO BE POST
00Z.  UPSTREAM NRN PLAINS AIRMASS WILL GRADUALLY PASS THROUGH IA
DURING THE DAY BUT DEEP NW FLOW AND MIXING WILL STILL ALLOW
CENTRAL/SRN HIGHS TO REACH LOW/MID 90S BY AFTERNOON.  DO NOT
ANTICIPATED ENOUGH PRECIP TONIGHT TO AFFECT THAT.  BLEND OF SREF/NAM
SOUNDINGS SEEMS REASONABLE.

NRN PLAINS SURFACE RIDGE WILL RETURN IA TEMPS TO NORMAL FOR FRI WITH
CONTINUED DRY WEATHER AS GREAT LAKES SHORT WAVE DEPARTS.  THIS WILL
BE FOLLOWED BY AN EXTENDED PERIOD OF ROCKIES AND HIGH PLAINS
RIDGING...RIGHT INTO WED AND BEYOND...LEAVING IA WITH WARM BUT NOT
EXTREME TEMPS AND LOW END PRECIP POTENTIAL.  CHANCES INCREASE
SOMEWHAT THIS WEEKEND AS SHORT WAVE TOPS THE RIDGE INCREASING
FORCING...ESPECIALLY THERMODYNAMIC...BY SAT.  THIS WEAK FORCING
LINGERS INTO SUN...AND POSSIBLY EARLY MON LEADING TO SEVERAL DAYS
WORTH OF CHANCE POPS.  MODELS CONTINUE TO DABBLE IN WEAK QPF EVENTS
AFTER THIS TIME...BUT THERE IS REALLY NO CONSISTENT FORCING FEATURE
TO LATCH ONTO SO HAVE LEFT MON NIGHT-WED DRY AT THIS POINT.

REGARDING TEMPS..ONLY REAL CONCERN IS LOW CONFIDENCE FORECAST
SATURDAY.  QUESTIONS ON HOW MUCH WE WILL MIX IN NEW REGIME WITH
LIGHT WINDS.  HAVE PRETTY MUCH MIXED THINGS OUT TO 900-850MB OR
MORE...MIXING SEASONALLY...BUT FEEL NAM IS UNDERDONE WHICH SEEMS TO
BE THE CASE AT TIMES IN WEAK FLOW.

&&

.AVIATION...26/00Z
COLD FRONT PUSHING INTO THE STATE WITH STORMS DEVELOPING ALONG AND
BEHIND THE BOUNDARY.  GENERALLY VFR CONDITIONS FORECAST BUT LOCAL
MVFR CONDITIONS IN STORMS POSSIBLE.  STRONG WIND GUSTS LIKELY IN
STORMS ALONG WITH ONE INCH DIAMETER HAIL.  WIND BEHIND THE FRONT
WILL SHIFT TO THE NW AT 15-25 KTS.

&&

.DMX WATCHES/WARNINGS/ADVISORIES...
EXCESSIVE HEAT WARNING UNTIL 7 PM CDT
ADAIR-ADAMS-APPANOOSE-AUDUBON-BOONE-CALHOUN-CARROLL-CASS-CLARKE-
CRAWFORD-DALLAS-DAVIS-DECATUR-GREENE-GUTHRIE-HAMILTON-JASPER-LUCAS-
MADISON-MAHASKA-MARION-MONROE-POLK-RINGGOLD-SAC-STORY-TAYLOR-UNION-
WAPELLO-WARREN-WAYNE-WEBSTER

HEAT ADVISORY UNTIL 7 PM CDT
BLACK HAWK-BREMER-BUTLER-FRANKLIN-GRUNDY-HARDIN-HUMBOLDT-MARSHALL-
POCAHONTAS-POWESHIEK-TAMA-WRIGHT

&&

SHORT TERM...PODRAZIK
LONG TERM...SMALL
AVIATION...FAB

Hazardous weather outlook, Jul 25, 7:09 PM CDT, 14 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DES MOINES IA
709 PM CDT WED JUL 25 2012

IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075-081>086-
092>097-270015-
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-
709 PM CDT WED JUL 25 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL IOWA.

.DAY ONE...TONIGHT

THUNDERSTORMS ARE EXPECTED TONIGHT. SOME STORMS MAY BE SEVERE WITH
HIGH WIND THE PRIMARY THREAT. LARGE HAIL IS ALSO POSSIBLE.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

SCATTERED THUNDERSTORMS ARE EXPECTED PERIODICALLY FROM LATE
SATURDAY NIGHT THOUGH MONDAY. SOME SEVERE WEATHER IS
POSSIBLE...BUT WIDESPREAD SEVERE WEATHER IS NOT LIKELY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED THROUGH MIDNIGHT.

FAB

In the hours before

Local storm report, Jul 25, 6:22 PM CDT, 1 hour 1 minute before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
622 PM CDT WED JUL 25 2012

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0617 PM     HEAVY RAIN       ESTHERVILLE             43.40N 94.83W
07/25/2012  E0.00 INCH       EMMET              IA   EMERGENCY MNGR

            MINOR STREET FLOODING REPORTED...WITH WIND GUSTS TO 35
            MPH AND FREQUENT CLOUD TO GROUND LIGHTNING. NO HAIL WAS
            OBSERVED.

&&

ZOGG

Local storm report, Jul 25, 6:30 PM CDT, 53 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
630 PM CDT WED JUL 25 2012

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0623 PM     HAIL             6 N RUTHVEN             43.22N 94.90W
07/25/2012  E1.75 INCH       PALO ALTO          IA   TRAINED SPOTTER

            HAIL AS LARGE AS GOLFBALLS.

&&

ZOGG

Local storm report, Jul 25, 6:40 PM CDT, 43 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
640 PM CDT WED JUL 25 2012

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0636 PM     HAIL             4 W FENTON              43.21N 94.51W
07/25/2012  E0.88 INCH       PALO ALTO          IA   TRAINED SPOTTER

            HEAVY RAIN WITH HAIL UP TO NICKEL SIZE.

&&

BSS

Special weather statement, Jul 25, 6:57 PM CDT, 26 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
657 PM CDT WED JUL 25 2012

IAZ044-260100-
CRAWFORD-
657 PM CDT WED JUL 25 2012

...STRONG THUNDERSTORMS MOVING INTO CRAWFORD COUNTY...

AT 654 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM OVER WEST CENTRAL CRAWFORD COUNTY...MOVING EAST
AT 10 MPH.

NICKEL SIZE HAIL...WINDS UP TO 50 MPH...ARE POSSIBLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
  SCHLESWIG...          DELOIT...             KIRON...
  KIRON...

GUSTY WINDS MAY CAUSE SMALL BRANCHES TO BE BLOWN DOWN...AND LOOSE
OBJECTS TO BLOW AROUND. SEEK SHELTER IN A STURDY STRUCTURE UNTIL THIS
STORM HAS PASSED.

BOKSA

Local storm report, Jul 25, 7:13 PM CDT, 10 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
713 PM CDT WED JUL 25 2012

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0711 PM     HAIL             WEST BEND               42.96N 94.46W
07/25/2012  E0.88 INCH       PALO ALTO          IA   PUBLIC

            HEAVY RAIN AND UP TO NICKEL SIZE HAIL.

&&

BSS

Local storm report, Jul 25, 7:20 PM CDT, 3 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
720 PM CDT WED JUL 25 2012

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0705 PM     TSTM WND GST     E ALGONA                43.07N 94.23W
07/25/2012  M62 MPH          KOSSUTH            IA   MESONET

            MEASURED WIND GUST AT ALGONA IDOT RWIS SITE.

&&

BSS

The office that day

Everything else NWS Des Moines, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 25, 7:09 PM CDT	Severe Thunderstorm Warning	DMX	Humboldt, Pocahontas	51 min
Jul 25, 7:29 PM CDT	Severe Thunderstorm Warning	DMX	Hancock, Wright	46 min
Jul 25, 8:02 PM CDT	Severe Thunderstorm Warning	DMX	Boone, Calhoun, Greene, Hamilton, Webster	43 min
Jul 25, 8:09 PM CDT	Severe Thunderstorm Warning	DMX	Cerro Gordo, Franklin, Hamilton, Hancock, Hardin, Wright	51 min
Jul 25, 8:22 PM CDT	Severe Thunderstorm Warning	DMX	Marshall	53 min
Jul 25, 8:39 PM CDT	Severe Thunderstorm Warning	DMX	Boone, Hamilton, Hardin, Story, Webster	66 min
Jul 25, 9:04 PM CDT	Severe Thunderstorm Warning	DMX	Jasper, Marion, Polk, Story, Warren	41 min
Jul 25, 9:10 PM CDT	Severe Thunderstorm Warning	DMX	Grundy, Hardin, Marshall, Story, Tama	50 min
Jul 25, 9:52 PM CDT	Severe Thunderstorm Warning	DMX	Black Hawk	33 min
Jul 25, 9:57 PM CDT	Severe Thunderstorm Warning	DMX	Poweshiek, Tama	34 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2012 Every severe thunderstorm warning in 2012

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.