Alert archive / Iowa / Tornado Warnings in 2011
Tornado Warning 26, NWS Des Moines, IA
NWS Des Moines, IA issued this tornado warning at Apr 9, 2011, 10:28 PM CDT for 4 counties in Iowa. It was in force for 47 min. 2 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
- Apr 9, 2011, 10:28 PM CDT (03:28 UTC)
- Expired
- Apr 9, 2011, 11:15 PM CDT
- In force
- 47 min
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
Counties Humboldt County, IA, Kossuth County, IA, Palo Alto County, IA, Pocahontas County, IA
The radar
The Des Moines radar (KDMX), 152 km from the middle of the area, began a volume at 03:29 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 9, 11:16 PM CDT | TORNADO | 4 N Bode, IA | TWO HOG CONFINEMENT BUILDINGS DESTROYED. |
| Apr 9, 11:22 PM CDT | TORNADO | 2 N Bode, 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 9, 5:48 PM CDT | Tornado Watch | SPC | 7 hr |
The nearest sounding before it
Minneapolis, MN (KMPX), launched 00:00Z, 3.5 hours before the alert went out and 216 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 612 m above ground
- 0-6 km bulk shear
- 54 kt
- 0-1 km storm-relative helicity
- 355 m²/s²
- 0-3 km storm-relative helicity
- 550 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 5.2
The text
As transmitted, in the capitals the NWS used until 2016.
714 WFUS53 KDMX 100328 TORDMX IAC091-109-147-151-100415- /O.NEW.KDMX.TO.W.0026.110410T0328Z-110410T0415Z/ BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE DES MOINES IA 1028 PM CDT SAT APR 9 2011 THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A * TORNADO WARNING FOR... NORTHWESTERN HUMBOLDT COUNTY IN NORTH CENTRAL IOWA... SOUTHWESTERN KOSSUTH COUNTY IN NORTH CENTRAL IOWA... SOUTHEASTERN PALO ALTO COUNTY IN NORTHWEST IOWA... NORTHEASTERN POCAHONTAS COUNTY IN NORTHWEST IOWA... * UNTIL 1115 PM CDT * AT 1025 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS STORM WAS LOCATED 10 MILES NORTH OF POCAHONTAS...OR 25 MILES SOUTHWEST OF ALGONA...AND MOVING NORTHEAST AT 35 MPH. * LOCATIONS IMPACTED INCLUDE... ALGONA...ROLFE...RODMAN...WEST BEND...OTTOSEN...WHITTEMORE...BODE AND ALGONA AIRPORT. 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 4318 9424 4292 9410 4276 9467 4295 9479 TIME...MOT...LOC 0328Z 246DEG 30KT 4288 9460 $$
2 follow-up statements
567 WWUS53 KDMX 100341 SVSDMX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 1041 PM CDT SAT APR 9 2011 IAC091-109-147-151-100415- /O.CON.KDMX.TO.W.0026.000000T0000Z-110410T0415Z/ POCAHONTAS IA-PALO ALTO IA-KOSSUTH IA-HUMBOLDT IA- 1041 PM CDT SAT APR 9 2011 ...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHWESTERN HUMBOLDT... SOUTHWESTERN KOSSUTH...SOUTHEASTERN PALO ALTO AND NORTHEASTERN POCAHONTAS COUNTIES UNTIL 1115 PM CDT... AT 1038 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS STORM WAS LOCATED 14 MILES SOUTHEAST OF EMMETSBURG...OR 20 MILES SOUTHWEST OF ALGONA...MOVING NORTHEAST AT 25 MPH. LOCATIONS IMPACTED INCLUDE... ALGONA...RODMAN...WEST BEND...OTTOSEN...BODE...WHITTEMORE AND ALGONA AIRPORT. PRECAUTIONARY/PREPAREDNESS ACTIONS... THIS IS A DANGEROUS STORM. IMMEDIATELY SEEK SHELTER IN A BASEMENT... OR IN AN INTERIOR ROOM OF A REINFORCED BUILDING. STAY AWAY FROM WINDOWS. IF YOU ARE OUTSIDE...IN A MOBILE HOME...OR IN A VEHICLE...SEEK SHELTER IN A NEARBY REINFORCED BUILDING. AS A LAST RESORT...FIND THE LOWEST SPOT AVAILABLE AND COVER YOUR HEAD. && LAT...LON 4300 9465 4318 9424 4292 9410 4281 9451 TIME...MOT...LOC 0341Z 237DEG 21KT 4294 9455 $$
488
WWUS53 KDMX 100356
SVSDMX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
1056 PM CDT SAT APR 9 2011
IAC091-151-100406-
/O.CAN.KDMX.TO.W.0026.000000T0000Z-110410T0415Z/
POCAHONTAS IA-HUMBOLDT IA-
1056 PM CDT SAT APR 9 2011
...THE TORNADO WARNING FOR NORTHWESTERN HUMBOLDT AND NORTHEASTERN
POCAHONTAS COUNTIES IS CANCELLED...
THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA. ANOTHER TORNADO WARNING REMAINS IN EFFECT FOR PORTIONS OF
NORTHEASTERN POCAHONTAS COUNTY AND NORTHWESTERN HUMBOLDT COUNTY.
LAT...LON 4298 9413 4291 9455 4291 9456 4302 9462
4318 9424
TIME...MOT...LOC 0356Z 237DEG 21KT 4299 9445
$$
IAC109-147-100415-
/O.CON.KDMX.TO.W.0026.000000T0000Z-110410T0415Z/
PALO ALTO IA-KOSSUTH IA-
1056 PM CDT SAT APR 9 2011
...A TORNADO WARNING REMAINS IN EFFECT FOR SOUTHWESTERN KOSSUTH AND
SOUTHEASTERN PALO ALTO COUNTIES UNTIL 1115 PM CDT...
AT 1055 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
STORM WAS LOCATED 13 MILES SOUTHWEST OF ALGONA...MOVING NORTHEAST AT
25 MPH.
LOCATIONS IMPACTED INCLUDE...
ALGONA...WHITTEMORE AND ALGONA AIRPORT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
THIS IS A DANGEROUS STORM. IMMEDIATELY SEEK SHELTER IN A BASEMENT...
OR IN AN INTERIOR ROOM OF A REINFORCED BUILDING. STAY AWAY FROM
WINDOWS.
IF YOU ARE OUTSIDE...IN A MOBILE HOME...OR IN A VEHICLE...SEEK
SHELTER IN A NEARBY REINFORCED BUILDING. AS A LAST RESORT...FIND THE
LOWEST SPOT AVAILABLE AND COVER YOUR HEAD.
TORNADOES ARE DIFFICULT TO SEE AT NIGHT...ACT QUICKLY. TAKE COVER
NOW.
&&
LAT...LON 4298 9413 4291 9455 4291 9456 4302 9462
4318 9424
TIME...MOT...LOC 0356Z 237DEG 21KT 4299 9445
$$
BEERENDSThe 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, 10:54 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, 1:38 AM CDT | Severe Thunderstorm Warning | DMX | Calhoun, Humboldt, Pocahontas, Webster | 52 min |
| Apr 10, 3:54 AM CDT | Wind Advisory | DMX | Adair, Adams, Appanoose, Audubon, Black Hawk, Boone and 33 more | 15 hr |
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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.