Alert archive / Iowa / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 41, NWS Des Moines, IA

April 10, 20114 counties in Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Apr 10, 2011, 1:38 AM CDT for 4 counties in Iowa. It was in force for 52 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Apr 10, 2011, 1:38 AM CDT (06:38 UTC)
Expired: Apr 10, 2011, 2:30 AM CDT
In force: 52 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

Counties Calhoun County, IA, Humboldt County, IA, Pocahontas County, IA, Webster County, IA

The radar

The Des Moines radar (KDMX), 107 km from the middle of the area, began a volume at 06:41 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.

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 9, 11:01 PM CDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 6.6 hours before the alert went out and 197 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: 3327 J/kg
Mixed-layer CIN: -24 J/kg
Mixed-layer LCL: 1533 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 270 m²/s²
0-3 km storm-relative helicity: 403 m²/s²
Significant tornado parameter: 3.7
Supercell composite: 19.0

Open this sounding in Storm Lab

The text

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

892 
WUUS53 KDMX 100638
SVRDMX
IAC025-091-151-187-100730-
/O.NEW.KDMX.SV.W.0041.110410T0638Z-110410T0730Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
138 AM CDT SUN APR 10 2011

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CALHOUN COUNTY IN WEST CENTRAL IOWA...
  WESTERN HUMBOLDT COUNTY IN NORTH CENTRAL IOWA...
  SOUTHERN POCAHONTAS COUNTY IN NORTHWEST IOWA...
  WEBSTER COUNTY IN CENTRAL IOWA...

* UNTIL 230 AM CDT

* AT 137 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
  HAIL.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM 6
  MILES EAST OF NEWELL TO 6 MILES WEST OF ROCKWELL CITY TO GLIDDEN...
  AND MOVING EAST AT 60 MPH.

* LOCATIONS IMPACTED INCLUDE...
  FORT DODGE...ROCKWELL CITY...POCAHONTAS...MANSON...GOWRIE...
  HUMBOLDT...DAKOTA CITY...JOLLEY...POMEROY...LOHRVILLE...RINARD...
  PALMER...SOMERS...FARNHAMVILLE...KNIERIM...GILMORE CITY...BARNUM...
  CALLENDER...BRADGATE AND MOORLAND.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

LARGE HAIL CAN CAUSE INJURY AND PROPERTY DAMAGE. SEEK SAFETY INDOORS
UNTIL THE STORM PASSES.

&&

LAT...LON 4287 9423 4242 9395 4221 9393 4220 9467
      4221 9467 4221 9485 4247 9486 4248 9490
      4253 9492 4268 9493
TIME...MOT...LOC 0639Z 270DEG 51KT 4264 9485 4241 9471
          4207 9466
WIND...HAIL <50MPH 1.00IN

$$

BEERENDS

5 follow-up statements

308 
WWUS53 KDMX 100654
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
154 AM CDT SUN APR 10 2011

IAC025-091-151-187-100730-
/O.CON.KDMX.SV.W.0041.000000T0000Z-110410T0730Z/
POCAHONTAS IA-HUMBOLDT IA-CALHOUN IA-WEBSTER IA-
154 AM CDT SUN APR 10 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR WEBSTER...
CALHOUN...WESTERN HUMBOLDT AND SOUTHERN POCAHONTAS COUNTIES UNTIL 230
AM CDT...

AT 150 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING PING PONG BALL SIZE
HAIL.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM
POCAHONTAS TO MANSON TO 9 MILES SOUTHEAST OF LAKE CITY...MOVING EAST
AT 60 MPH.

LOCATIONS IMPACTED INCLUDE...
  FORT DODGE...GOWRIE...HUMBOLDT...DAKOTA CITY...KNIERIM...SOMERS...
  FARNHAMVILLE...BARNUM...GILMORE CITY...PIONEER...CLARE...
  CALLENDER...MOORLAND...BRADGATE...FORT DODGE AIRPORT...HARCOURT...
  RUTLAND...OTHO...BADGER AND DAYTON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PREPARE FOR LARGE HAIL AND DEADLY CLOUD TO GROUND LIGHTNING. PEOPLE
OUTSIDE SHOULD MOVE TO A REINFORCED BUILDING AND AWAY FROM WINDOWS.

&&

LAT...LON 4287 9423 4242 9395 4225 9394 4221 9466
      4224 9473 4249 9479 4249 9490 4269 9491
TIME...MOT...LOC 0654Z 269DEG 50KT 4274 9461 4251 9450
          4221 9450
WIND...HAIL <50MPH 1.50IN

$$

BEERENDS

891 
WWUS53 KDMX 100703
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
203 AM CDT SUN APR 10 2011

IAC025-091-151-187-100730-
/O.CON.KDMX.SV.W.0041.000000T0000Z-110410T0730Z/
POCAHONTAS IA-HUMBOLDT IA-CALHOUN IA-WEBSTER IA-
203 AM CDT SUN APR 10 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR WEBSTER...
EASTERN CALHOUN...WESTERN HUMBOLDT AND SOUTHEASTERN POCAHONTAS
COUNTIES UNTIL 230 AM CDT...

AT 203 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE HAIL. 
THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM 11 MILES WEST
OF HUMBOLDT TO 8 MILES WEST OF FORT DODGE TO GOWRIE...MOVING EAST AT
55 MPH.

LOCATIONS IMPACTED INCLUDE...
  FORT DODGE...HUMBOLDT...DAKOTA CITY...CALLENDER...MOORLAND...
  BRADGATE...FORT DODGE AIRPORT...RUTLAND...OTHO...BADGER...LEHIGH
  AND DUNCOMBE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PREPARE FOR LARGE HAIL AND DEADLY CLOUD TO GROUND LIGHTNING. PEOPLE
OUTSIDE SHOULD MOVE TO A REINFORCED BUILDING AND AWAY FROM WINDOWS.

&&

LAT...LON 4229 9460 4252 9462 4274 9474 4287 9423
      4242 9395 4233 9394
TIME...MOT...LOC 0703Z 269DEG 50KT 4274 9444 4251 9433
          4231 9433
WIND...HAIL <50MPH 1.00IN

$$

BEERENDS

654 
WWUS53 KDMX 100711
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
211 AM CDT SUN APR 10 2011

IAC025-151-100721-
/O.CAN.KDMX.SV.W.0041.000000T0000Z-110410T0730Z/
POCAHONTAS IA-CALHOUN IA-
211 AM CDT SUN APR 10 2011

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN CALHOUN AND
SOUTHEASTERN POCAHONTAS COUNTIES IS CANCELLED...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAS MOVED OUT OF 
THE AREA.

LAT...LON 4239 9395 4232 9440 4247 9439 4248 9442
      4277 9445 4284 9421
TIME...MOT...LOC 0711Z 269DEG 50KT 4275 9435 4251 9421
          4235 9424

$$

IAC091-187-100730-
/O.CON.KDMX.SV.W.0041.000000T0000Z-110410T0730Z/
HUMBOLDT IA-WEBSTER IA-
211 AM CDT SUN APR 10 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHERN
WEBSTER AND SOUTHWESTERN HUMBOLDT COUNTIES UNTIL 230 AM CDT...

AT 207 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE HAIL. 
THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM 11 MILES WEST
OF HUMBOLDT TO 5 MILES WEST OF FORT DODGE TO GOWRIE...MOVING EAST AT
55 MPH.

LOCATIONS IMPACTED INCLUDE...
  FORT DODGE...HUMBOLDT...DAKOTA CITY...RUTLAND...FORT DODGE
  AIRPORT...OTHO...BADGER AND DUNCOMBE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PREPARE FOR LARGE HAIL AND DEADLY CLOUD TO GROUND LIGHTNING. PEOPLE
OUTSIDE SHOULD MOVE TO A REINFORCED BUILDING AND AWAY FROM WINDOWS.

&&

LAT...LON 4239 9395 4232 9440 4247 9439 4248 9442
      4277 9445 4284 9421
TIME...MOT...LOC 0711Z 269DEG 50KT 4275 9435 4251 9421
          4235 9424
WIND...HAIL <50MPH 1.00IN

$$

BEERENDS

043 
WWUS53 KDMX 100718
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
218 AM CDT SUN APR 10 2011

IAC091-100728-
/O.CAN.KDMX.SV.W.0041.000000T0000Z-110410T0730Z/
HUMBOLDT IA-
218 AM CDT SUN APR 10 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN HUMBOLDT COUNTY
IS CANCELLED...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAS WEAKENED ACROSS 
THE WARNED AREA.

LAT...LON 4242 9397 4239 9428 4250 9430 4265 9433
      4264 9410
TIME...MOT...LOC 0718Z 246DEG 43KT 4267 9420 4258 9414
          4244 9414

$$

IAC187-100730-
/O.CON.KDMX.SV.W.0041.000000T0000Z-110410T0730Z/
WEBSTER IA-
218 AM CDT SUN APR 10 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHERN
WEBSTER COUNTY UNTIL 230 AM CDT...

AT 215 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE HAIL. 
THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM HUMBOLDT TO
FORT DODGE TO 6 MILES SOUTH OF FORT DODGE...MOVING NORTHEAST AT 50
MPH.

LOCATIONS IMPACTED INCLUDE...
  BADGER.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PREPARE FOR LARGE HAIL AND DEADLY CLOUD TO GROUND LIGHTNING. PEOPLE
OUTSIDE SHOULD MOVE TO A REINFORCED BUILDING AND AWAY FROM WINDOWS.

&&

LAT...LON 4242 9397 4239 9428 4250 9430 4265 9433
      4264 9410
TIME...MOT...LOC 0718Z 246DEG 43KT 4267 9420 4258 9414
          4244 9414
WIND...HAIL <50MPH 1.00IN

$$

BEERENDS

871 
WWUS53 KDMX 100728
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
228 AM CDT SUN APR 10 2011

IAC187-100739-
/O.EXP.KDMX.SV.W.0041.000000T0000Z-110410T0730Z/
WEBSTER IA-
228 AM CDT SUN APR 10 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN WEBSTER COUNTY WILL
EXPIRE AT 230 AM CDT...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAS WEAKENED BELOW
SEVERE LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR
PROPERTY.

LAT...LON 4242 9397 4239 9428 4250 9430 4265 9433
      4264 9410
TIME...MOT...LOC 0729Z 246DEG 43KT 4272 9403 4263 9397
          4249 9398

$$

BEERENDS

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 9, 7:09 PM CDT	Tornado Warning	DMX	Crawford	51 min
Apr 9, 7:58 PM CDT	Tornado Warning	DMX	Sac	47 min
Apr 9, 8:23 PM CDT	Tornado Warning	DMX	Sac	22 min
Apr 9, 8:41 PM CDT	Tornado Warning	DMX	Sac	34 min
Apr 9, 8:57 PM CDT	Severe Thunderstorm Warning	DMX	Kossuth, Palo Alto	33 min
Apr 9, 9:11 PM CDT	Tornado Warning	DMX	Calhoun, Pocahontas, Sac	49 min
Apr 9, 9:19 PM CDT	Severe Thunderstorm Warning	DMX	Sac	26 min
Apr 9, 9:48 PM CDT	Severe Thunderstorm Warning	DMX	Hancock, Kossuth, Winnebago	42 min
Apr 9, 9:55 PM CDT	Tornado Warning	DMX	Palo Alto, Pocahontas	35 min
Apr 9, 10:12 PM CDT	Tornado Warning	DMX	Hancock, Kossuth	33 min
Apr 9, 10:18 PM CDT	Tornado Warning	DMX	Cerro Gordo, Hancock, Winnebago, Worth	42 min
Apr 9, 10:22 PM CDT	Tornado Warning	DMX	Pocahontas	38 min
Apr 9, 10:28 PM CDT	Tornado Warning	DMX	Humboldt, Kossuth, Palo Alto, Pocahontas	47 min
Apr 9, 10:54 PM CDT	Tornado Warning	DMX	Humboldt, Kossuth, Palo Alto, Pocahontas	51 min
Apr 9, 10:58 PM CDT	Severe Thunderstorm Warning	DMX	Cerro Gordo, Worth	25 min
Apr 9, 11:11 PM CDT	Tornado Warning	DMX	Kossuth, Palo Alto	12 min
Apr 9, 11:24 PM CDT	Severe Thunderstorm Warning	DMX	Emmet, Kossuth, Palo Alto	36 min
Apr 9, 11:29 PM CDT	Tornado Warning	DMX	Hancock, Kossuth, Winnebago	33 min
Apr 9, 11:36 PM CDT	Tornado Warning	DMX	Emmet, Palo Alto	39 min
Apr 9, 11:41 PM CDT	Severe Thunderstorm Warning	DMX	Kossuth, Winnebago	49 min
Apr 9, 11:55 PM CDT	Tornado Warning	DMX	Kossuth, Palo Alto	35 min
Apr 9, 11:58 PM CDT	Severe Thunderstorm Warning	DMX	Winnebago, Worth	32 min
Apr 10, 12:24 AM CDT	Severe Thunderstorm Warning	DMX	Hancock, Kossuth, Winnebago, Worth	31 min
Apr 10, 12:53 AM CDT	Severe Thunderstorm Warning	DMX	Worth	22 min
Apr 10, 1:07 AM CDT	Severe Thunderstorm Warning	DMX	Sac	38 min
Apr 10, 3:54 AM CDT	Wind Advisory	DMX	Adair, Adams, Appanoose, Audubon, Black Hawk, Boone and 33 more	15 hr

Nearby

Severe Thunderstorm Warnings in Iowa, 2011 Every severe thunderstorm warning in 2011

Sources

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