Alert archive / Iowa / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 39, NWS Des Moines, IA

April 12, 2014Grundy County, Hardin County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Apr 12, 2014, 9:11 PM CDT for Grundy County, Hardin County, Iowa. It was in force for 34 min. 1 report 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: Apr 12, 2014, 9:11 PM CDT (02:11 UTC)
Expired: Apr 12, 2014, 9:45 PM CDT
In force: 34 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

Counties Grundy County, IA, Hardin County, IA

The radar

The Des Moines radar (KDMX), 97 km from the middle of the area, began a volume at 02:14 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
Apr 12, 9:20 PM CDT	HAIL 1	Eldora, IA

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

The watch it was issued in

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

Issued	Product	Office	Lasted
Apr 12, 3:15 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 2.2 hours before the alert went out and 226 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: 661 J/kg
Mixed-layer CIN: -152 J/kg
Mixed-layer LCL: 1978 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 34 m²/s²
0-3 km storm-relative helicity: 80 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

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

507 
WUUS53 KDMX 130211
SVRDMX
IAC075-083-130245-
/O.NEW.KDMX.SV.W.0039.140413T0211Z-140413T0245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
911 PM CDT SAT APR 12 2014

THE NATIONAL WEATHER SERVICE IN DES MOINES  HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN HARDIN COUNTY IN CENTRAL IOWA...
  NORTHWESTERN GRUNDY COUNTY IN CENTRAL IOWA...

* UNTIL 945 PM CDT

* AT 910 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED OVER ELDORA...
  MOVING NORTHEAST AT 30 MPH.

  HAZARD...60 MPH WIND GUSTS AND HALF DOLLAR SIZE HAIL. 

  SOURCE...RADAR INDICATED. 

  IMPACT...HAIL DAMAGE TO VEHICLES IS EXPECTED. EXPECT WIND DAMAGE 
           TO ROOFS...SIDING AND TREES. 

* LOCATIONS IMPACTED INCLUDE...
  ELDORA...ACKLEY...WELLSBURG...STEAMBOAT ROCK...HOLLAND...OWASA...
  PINE LAKE STATE PARK...ACKLEY MUNICIPAL AIRPORT AND ELDORA
  MUNICIPAL AIRPORT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT...LON 4230 9315 4245 9323 4256 9301 4256 9285
      4242 9269
TIME...MOT...LOC 0210Z 231DEG 25KT 4236 9309 

HAIL...1.25IN
WIND...60MPH

$$

AWB

1 follow-up statement

278 
WWUS53 KDMX 130241
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
941 PM CDT SAT APR 12 2014

IAC075-083-130250-
/O.EXP.KDMX.SV.W.0039.000000T0000Z-140413T0245Z/
HARDIN IA-GRUNDY IA-
941 PM CDT SAT APR 12 2014

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN HARDIN AND
NORTHWESTERN GRUNDY COUNTIES WILL EXPIRE AT 945 PM CDT...
        
THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE AREA.
THEREFORE THE WARNING WILL BE ALLOWED TO EXPIRE.  HOWEVER GUSTY WINDS
ARE STILL POSSIBLE WITH THIS THUNDERSTORM.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 500 AM CDT SUNDAY
MORNING FOR  IOWA.A SEVERE THUNDERSTORM WATCH ALSO REMAINS IN EFFECT
UNTIL 500 AM CDT SUNDAY MORNING FOR  IOWA.

REMEMBER...A SEVERE THUNDERSTORM WARNING STILL REMAINS IN EFFECT FOR
PORTIONS OF GRUNDY COUNTY.

LAT...LON 4230 9315 4245 9323 4256 9301 4256 9285
      4242 9269
TIME...MOT...LOC 0236Z 231DEG 25KT 4236 9309 

$$

AWB

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 12, 7:18 PM CDT	Severe Thunderstorm Warning	DMX	Bremer	42 min
Apr 12, 7:19 PM CDT	Severe Thunderstorm Warning	DMX	Boone, Hamilton, Hardin, Story	26 min
Apr 12, 7:29 PM CDT	Severe Thunderstorm Warning	DMX	Boone, Hamilton, Webster	46 min
Apr 12, 7:34 PM CDT	Severe Thunderstorm Warning	DMX	Cass	41 min
Apr 12, 7:39 PM CDT	Severe Thunderstorm Warning	DMX	Guthrie	51 min
Apr 12, 7:39 PM CDT	Severe Thunderstorm Warning	DMX	Calhoun, Pocahontas, Sac	36 min
Apr 12, 7:45 PM CDT	Severe Thunderstorm Warning	DMX	Boone, Hamilton, Hardin, Story	45 min
Apr 12, 7:54 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Adams, Cass	51 min
Apr 12, 7:57 PM CDT	Severe Thunderstorm Warning	DMX	Franklin, Hamilton, Hardin, Wright	33 min
Apr 12, 8:03 PM CDT	Severe Thunderstorm Warning	DMX	Boone	27 min
Apr 12, 8:15 PM CDT	Severe Thunderstorm Warning	DMX	Calhoun, Sac	30 min
Apr 12, 8:17 PM CDT	Severe Thunderstorm Warning	DMX	Crawford, Sac	28 min
Apr 12, 8:20 PM CDT	Severe Thunderstorm Warning	DMX	Crawford	40 min
Apr 12, 8:24 PM CDT	Severe Thunderstorm Warning	DMX	Boone, Hamilton, Hardin, Marshall, Story	36 min
Apr 12, 8:30 PM CDT	Severe Thunderstorm Warning	DMX	Cerro Gordo, Franklin	30 min
Apr 12, 8:31 PM CDT	Severe Thunderstorm Warning	DMX	Boone, Hamilton, Story	44 min
Apr 12, 8:34 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Adams, Cass	41 min
Apr 12, 8:36 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Dallas, Guthrie, Madison	39 min
Apr 12, 8:41 PM CDT	Severe Thunderstorm Warning	DMX	Calhoun, Webster	49 min
Apr 12, 8:43 PM CDT	Severe Thunderstorm Warning	DMX	Calhoun, Sac	32 min
Apr 12, 8:49 PM CDT	Severe Thunderstorm Warning	DMX	Black Hawk, Bremer	41 min
Apr 12, 8:58 PM CDT	Severe Thunderstorm Warning	DMX	Grundy, Hardin, Marshall, Tama	32 min
Apr 12, 9:07 PM CDT	Severe Thunderstorm Warning	DMX	Dallas, Polk	38 min
Apr 12, 9:12 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Adams	33 min
Apr 12, 9:34 PM CDT	Severe Thunderstorm Warning	DMX	Black Hawk, Grundy, Marshall, Tama	41 min
Apr 12, 9:43 PM CDT	Special Weather Statement	DMX	Hamilton	32 min
Apr 12, 9:44 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Adams, Madison, Union	46 min
Apr 12, 9:46 PM CDT	Special Weather Statement	DMX	Polk	29 min
Apr 12, 9:49 PM CDT	Special Weather Statement	DMX	Madison	26 min
Apr 12, 9:54 PM CDT	Special Weather Statement	DMX	Carroll	36 min
Apr 12, 10:06 PM CDT	Severe Thunderstorm Warning	DMX	Hamilton, Hardin	24 min
Apr 12, 10:07 PM CDT	Severe Thunderstorm Warning	DMX	Clarke, Madison, Union, Warren	38 min
Apr 12, 10:09 PM CDT	Severe Thunderstorm Warning	DMX	Black Hawk, Bremer, Tama	36 min
Apr 12, 10:15 PM CDT	Severe Thunderstorm Warning	DMX	Decatur, Ringgold	45 min
Apr 12, 10:20 PM CDT	Severe Thunderstorm Warning	DMX	Jasper, Marshall, Poweshiek, Tama	25 min
Apr 12, 10:26 PM CDT	Severe Thunderstorm Warning	DMX	Clarke, Madison, Union, Warren	34 min
Apr 12, 10:31 PM CDT	Special Weather Statement	DMX	Polk	29 min
Apr 12, 10:33 PM CDT	Special Weather Statement	DMX	Humboldt	27 min
Apr 12, 10:44 PM CDT	Severe Thunderstorm Warning	DMX	Clarke, Lucas, Marion, Monroe, Warren	46 min
Apr 12, 10:44 PM CDT	Severe Thunderstorm Warning	DMX	Jasper, Marshall, Poweshiek, Tama	31 min
Apr 12, 10:54 PM CDT	Severe Thunderstorm Warning	DMX	Wayne	36 min
Apr 12, 11:11 PM CDT	Severe Thunderstorm Warning	DMX	Poweshiek, Tama	34 min
Apr 12, 11:20 PM CDT	Severe Thunderstorm Warning	DMX	Appanoose, Davis, Jasper, Mahaska, Marion, Monroe and 2 more	55 min
Apr 13, 12:32 AM CDT	Special Weather Statement	DMX	Carroll	28 min
Apr 13, 1:15 AM CDT	Special Weather Statement	DMX	Webster	30 min
Apr 13, 2:52 AM CDT	Severe Thunderstorm Warning	DMX	Adair, Cass, Guthrie	38 min
Apr 13, 3:37 PM CDT	Flood Watch	DMX	Appanoose, Black Hawk, Davis, Decatur, Grundy, Jasper and 9 more	6 hr
Apr 13, 3:44 PM CDT	Wind Advisory	DMX	Adair, Adams, Audubon, Boone, Calhoun, Carroll and 28 more	8 hr

Nearby

Severe Thunderstorm Warnings in Iowa, 2014 Every severe thunderstorm warning in 2014

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.