Alert archive / Iowa / Tornado Warnings in 2011
Tornado Warning 4, NWS Des Moines, IA
NWS Des Moines, IA issued this tornado warning at Mar 22, 2011, 5:29 PM CDT for Crawford County, Iowa. It was in force for 35 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
- Mar 22, 2011, 5:29 PM CDT (22:29 UTC)
- Expired
- Mar 22, 2011, 6:04 PM CDT
- In force
- 35 min
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
County Crawford County, IA
The radar
The Omaha radar (KOAX), 109 km from the middle of the area, began a volume at 22:33 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 |
|---|---|---|---|
| Mar 22, 2:03 PM CDT | Tornado Watch | SPC | 7 hr |
The nearest sounding before it
Omaha, NE (KOAX), launched 12:00Z, 10.5 hours before the alert went out and 109 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.
- Mixed-layer CAPE
- 486 J/kg
- Mixed-layer CIN
- -475 J/kg
- Mixed-layer LCL
- 777 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 477 m²/s²
- 0-3 km storm-relative helicity
- 501 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
002
WFUS53 KDMX 222229
TORDMX
IAC047-222315-
/O.NEW.KDMX.TO.W.0004.110322T2229Z-110322T2315Z/
BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
529 PM CDT TUE MAR 22 2011
THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A
* TORNADO WARNING FOR...
CRAWFORD COUNTY IN WEST CENTRAL IOWA...
* UNTIL 615 PM CDT
* AT 526 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
STORM WAS LOCATED 10 MILES WEST OF EARLING...OR 23 MILES SOUTHWEST
OF DENISON...AND MOVING NORTHEAST AT 30 MPH.
* LOCATIONS IMPACTED INCLUDE...
DENISON...MANILLA...DOW CITY...ARION...BUCK GROVE...DENISON
AIRPORT...DELOIT AND VAIL.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
THIS IS A DANGEROUS STORM. IMMEDIATELY SEEK SHELTER IN A BASEMENT...
OR IN AN INTERIOR ROOM OF A REINFORCED BUILDING. STAY AWAY FROM
WINDOWS.
IF YOU ARE OUTSIDE...IN A MOBILE HOME...OR IN A VEHICLE...SEEK
SHELTER IN A NEARBY REINFORCED BUILDING. AS A LAST RESORT...FIND THE
LOWEST SPOT AVAILABLE AND COVER YOUR HEAD.
&&
LAT...LON 4219 9538 4206 9510 4196 9510 4186 9525
4185 9563 4186 9565 4187 9566
TIME...MOT...LOC 2229Z 216DEG 26KT 4176 9560
$$
JOHNSON3 follow-up statements
986
WWUS53 KDMX 222246
SVSDMX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
546 PM CDT TUE MAR 22 2011
IAC047-222315-
/O.CON.KDMX.TO.W.0004.000000T0000Z-110322T2315Z/
CRAWFORD IA-
546 PM CDT TUE MAR 22 2011
...A TORNADO WARNING REMAINS IN EFFECT FOR CRAWFORD COUNTY UNTIL 615
PM CDT...
AT 543 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
STORM WAS LOCATED NEAR DEFIANCE...OR 12 MILES SOUTH OF DENISON...
MOVING NORTHEAST AT 35 MPH.
LOCATIONS IMPACTED INCLUDE...
DENISON...MANILLA...ARION...BUCK GROVE...DENISON AIRPORT...DELOIT
AND VAIL.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
THIS IS A DANGEROUS STORM. IMMEDIATELY SEEK SHELTER IN A BASEMENT...
OR IN AN INTERIOR ROOM OF A REINFORCED BUILDING. STAY AWAY FROM
WINDOWS.
IF YOU ARE OUTSIDE...IN A MOBILE HOME...OR IN A VEHICLE...SEEK
SHELTER IN A NEARBY REINFORCED BUILDING. AS A LAST RESORT...FIND THE
LOWEST SPOT AVAILABLE AND COVER YOUR HEAD.
&&
LAT...LON 4190 9556 4201 9554 4219 9538 4206 9510
4196 9510 4186 9525 4185 9553
TIME...MOT...LOC 2246Z 215DEG 30KT 4187 9540
$$
JOHNSON496
WWUS53 KDMX 222256
SVSDMX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
556 PM CDT TUE MAR 22 2011
IAC047-222315-
/O.CON.KDMX.TO.W.0004.000000T0000Z-110322T2315Z/
CRAWFORD IA-
556 PM CDT TUE MAR 22 2011
...A TORNADO WARNING REMAINS IN EFFECT FOR EASTERN CRAWFORD COUNTY
UNTIL 615 PM CDT...
AT 551 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
STORM WAS LOCATED 6 MILES NORTH OF DEFIANCE...OR 8 MILES SOUTH OF
DENISON...MOVING NORTHEAST AT 40 MPH.
LOCATIONS IMPACTED INCLUDE...
DENISON...DELOIT AND VAIL.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
THIS IS A DANGEROUS STORM. IMMEDIATELY SEEK SHELTER IN A BASEMENT...
OR IN AN INTERIOR ROOM OF A REINFORCED BUILDING. STAY AWAY FROM
WINDOWS.
IF YOU ARE OUTSIDE...IN A MOBILE HOME...OR IN A VEHICLE...SEEK
SHELTER IN A NEARBY REINFORCED BUILDING. AS A LAST RESORT...FIND THE
LOWEST SPOT AVAILABLE AND COVER YOUR HEAD.
&&
LAT...LON 4186 9548 4194 9549 4210 9546 4219 9538
4206 9510 4196 9510 4186 9525
TIME...MOT...LOC 2257Z 218DEG 34KT 4195 9531
$$
JOHNSON495
WWUS53 KDMX 222304 RRA
SVSDMX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
604 PM CDT TUE MAR 22 2011
IAC047-222314-
/O.CAN.KDMX.TO.W.0004.000000T0000Z-110322T2315Z/
CRAWFORD IA-
604 PM CDT TUE MAR 22 2011
...THE TORNADO WARNING FOR EASTERN CRAWFORD COUNTY IS CANCELLED...
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
LAT...LON 4186 9548 4194 9549 4210 9546 4219 9538
4206 9510 4196 9510 4186 9525
TIME...MOT...LOC 2304Z 218DEG 34KT 4200 9525
$$
JOHNSONThe office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 22, 6:30 AM CDT | River Flood Warning | DMX | Black Hawk, Bremer, Butler | 4 days |
| Mar 22, 10:52 AM CDT | River Flood Warning | DMX | Palo Alto | 16 days |
| Mar 22, 10:52 AM CDT | River Flood Warning | DMX | Humboldt | 25 days |
| Mar 22, 4:34 PM CDT | Severe Thunderstorm Warning | DMX | Hancock, Humboldt, Kossuth, Wright | 13 min |
| Mar 22, 4:55 PM CDT | Tornado Warning | DMX | Carroll, Crawford | 35 min |
| Mar 22, 5:02 PM CDT | Tornado Warning | DMX | Adair, Adams, Cass | 43 min |
| Mar 22, 5:07 PM CDT | Severe Thunderstorm Warning | DMX | Audubon, Cass, Guthrie | 23 min |
| Mar 22, 5:18 PM CDT | Tornado Warning | DMX | Audubon, Cass, Guthrie | 27 min |
| Mar 22, 5:27 PM CDT | Severe Thunderstorm Warning | DMX | Audubon, Carroll, Greene | 33 min |
| Mar 22, 5:43 PM CDT | Tornado Warning | DMX | Audubon, Cass, Greene, Guthrie | 15 min |
| Mar 22, 5:44 PM CDT | Tornado Warning | DMX | Adair, Madison | 46 min |
| Mar 22, 5:47 PM CDT | Tornado Warning | DMX | Adams, Ringgold, Taylor, Union | 43 min |
| Mar 22, 6:16 PM CDT | Severe Thunderstorm Warning | DMX | Dallas, Madison, Polk | 44 min |
| Mar 22, 6:26 PM CDT | Tornado Warning | DMX | Dallas, Madison, Polk, Warren | 49 min |
| Mar 22, 6:27 PM CDT | Tornado Warning | DMX | Adair, Clarke, Madison, Union, Warren | 39 min |
| Mar 22, 6:32 PM CDT | Severe Thunderstorm Warning | DMX | Cerro Gordo, Hancock, Worth, Wright | 28 min |
| Mar 22, 6:45 PM CDT | Tornado Warning | DMX | Clarke, Decatur, Ringgold | 30 min |
| Mar 22, 6:50 PM CDT | Severe Thunderstorm Warning | DMX | Adair, Dallas, Madison | 25 min |
| Mar 22, 6:57 PM CDT | Tornado Warning | DMX | Adair, Madison, Union | 33 min |
Nearby
Tornado Warnings in Iowa, 2011Every tornado warning in 2011Tornadoes 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.