Alert archive / Iowa / Tornado Warnings in 2011
Tornado Warning 31, NWS Des Moines, IA
NWS Des Moines, IA issued this tornado warning at Apr 9, 2011, 11:55 PM CDT for Kossuth County, Palo Alto County, Iowa. It was in force for 35 min. 3 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, 11:55 PM CDT (04:55 UTC)
- Expired
- Apr 10, 2011, 12:30 AM CDT
- In force
- 35 min
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
Counties Kossuth County, IA, Palo Alto County, IA
The radar
The Des Moines radar (KDMX), 170 km from the middle of the area, began a volume at 04:54 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 10, 12:10 AM CDT | HAIL 1 | 1 Ese Lone Rock, IA | |
| Apr 10, 12:10 AM CDT | HAIL 2 | 1 Ese Lone Rock, IA | |
| Apr 10, 12:21 AM CDT | HAIL 1 | Bancroft, 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 |
| Apr 9, 11:01 PM CDT | Tornado Watch | SPC | 5 hr |
The nearest sounding before it
Minneapolis, MN (KMPX), launched 00:00Z, 4.9 hours before the alert went out and 194 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.
394 WFUS53 KDMX 100455 TORDMX IAC109-147-100530- /O.NEW.KDMX.TO.W.0031.110410T0455Z-110410T0530Z/ BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE DES MOINES IA 1155 PM CDT SAT APR 9 2011 THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A * TORNADO WARNING FOR... CENTRAL KOSSUTH COUNTY IN NORTH CENTRAL IOWA... EAST CENTRAL PALO ALTO COUNTY IN NORTHWEST IOWA... * UNTIL 1230 AM CDT * AT 1150 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS STORM WAS LOCATED 9 MILES EAST OF EMMETSBURG...OR 14 MILES WEST OF ALGONA...AND MOVING NORTHEAST AT 40 MPH. * LOCATIONS IMPACTED INCLUDE... BANCROFT...FENTON...ALGONA AIRPORT...LONE ROCK AND BURT. 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 4335 9427 4312 9406 4301 9453 4312 9462 TIME...MOT...LOC 0455Z 239DEG 34KT 4309 9445 $$ BEERENDS
5 follow-up statements
892 WWUS53 KDMX 100500 SVSDMX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 1200 AM CDT SUN APR 10 2011 IAC109-147-100530- /O.CON.KDMX.TO.W.0031.000000T0000Z-110410T0530Z/ PALO ALTO IA-KOSSUTH IA- 1200 AM CDT SUN APR 10 2011 ...A TORNADO WARNING REMAINS IN EFFECT FOR CENTRAL KOSSUTH AND EAST CENTRAL PALO ALTO COUNTIES UNTIL 1230 AM CDT... AT 1159 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS STORM WAS LOCATED 10 MILES WEST OF ALGONA...MOVING NORTHEAST AT 40 MPH. LOCATIONS IMPACTED INCLUDE... BANCROFT...FENTON...ALGONA AIRPORT...LONE ROCK AND BURT. PRECAUTIONARY/PREPAREDNESS ACTIONS... THIS IS A DANGEROUS STORM. IMMEDIATELY SEEK SHELTER IN A BASEMENT... OR IN AN INTERIOR ROOM OF A REINFORCED BUILDING. STAY AWAY FROM WINDOWS. IF YOU ARE OUTSIDE...IN A MOBILE HOME...OR IN A VEHICLE...SEEK SHELTER IN A NEARBY REINFORCED BUILDING. AS A LAST RESORT...FIND THE LOWEST SPOT AVAILABLE AND COVER YOUR HEAD. TORNADOES ARE DIFFICULT TO SEE AT NIGHT...ACT QUICKLY. TAKE COVER NOW. && LAT...LON 4317 9454 4335 9427 4312 9406 4302 9448 TIME...MOT...LOC 0500Z 240DEG 35KT 4312 9440 $$ BEERENDS
786
WWUS53 KDMX 100507
SVSDMX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
1207 AM CDT SUN APR 10 2011
IAC147-100517-
/O.CAN.KDMX.TO.W.0031.000000T0000Z-110410T0530Z/
PALO ALTO IA-
1207 AM CDT SUN APR 10 2011
...THE TORNADO WARNING FOR EAST CENTRAL PALO ALTO COUNTY IS
CANCELLED...
THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA. A TORNADO WARNING REMAINS IN EFFECT FOR PORTIONS OF
NORTHEASTERN PALO ALTO COUNTY.
LAT...LON 4314 9408 4303 9442 4304 9443 4322 9445
4333 9426
TIME...MOT...LOC 0507Z 237DEG 32KT 4316 9434
$$
IAC109-100530-
/O.CON.KDMX.TO.W.0031.000000T0000Z-110410T0530Z/
KOSSUTH IA-
1207 AM CDT SUN APR 10 2011
...A TORNADO WARNING REMAINS IN EFFECT FOR CENTRAL KOSSUTH COUNTY
UNTIL 1230 AM CDT...
AT 1203 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
STORM WAS LOCATED 9 MILES NORTHWEST OF ALGONA...MOVING NORTHEAST AT
35 MPH.
LOCATIONS IMPACTED INCLUDE...
LONE ROCK AND BURT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
THIS IS A DANGEROUS STORM. IMMEDIATELY SEEK SHELTER IN A BASEMENT...
OR IN AN INTERIOR ROOM OF A REINFORCED BUILDING. STAY AWAY FROM
WINDOWS.
IF YOU ARE OUTSIDE...IN A MOBILE HOME...OR IN A VEHICLE...SEEK
SHELTER IN A NEARBY REINFORCED BUILDING. AS A LAST RESORT...FIND THE
LOWEST SPOT AVAILABLE AND COVER YOUR HEAD.
TORNADOES ARE DIFFICULT TO SEE AT NIGHT...ACT QUICKLY. TAKE COVER
NOW.
&&
LAT...LON 4314 9408 4303 9442 4304 9443 4322 9445
4333 9426
TIME...MOT...LOC 0507Z 237DEG 32KT 4316 9434
$$
BEERENDS926
WWUS53 KDMX 100510
SVSDMX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
1210 AM CDT SUN APR 10 2011
IAC109-100530-
/O.CON.KDMX.TO.W.0031.000000T0000Z-110410T0530Z/
KOSSUTH IA-
1210 AM CDT SUN APR 10 2011
...A TORNADO WARNING REMAINS IN EFFECT FOR CENTRAL KOSSUTH COUNTY
UNTIL 1230 AM CDT...
AT 1207 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
STORM WAS LOCATED 8 MILES NORTHWEST OF ALGONA...MOVING NORTHEAST AT
35 MPH.
LOCATIONS IMPACTED INCLUDE...
LONE ROCK AND BURT.
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.
IN ADDITION TO THE TORNADO...THIS STORM IS ALSO EXPECTED TO PRODUCE
GOLF BALL SIZE HAIL AND WIDESPREAD DESTRUCTIVE WINDS.
TORNADOES ARE DIFFICULT TO SEE AT NIGHT...ACT QUICKLY. TAKE COVER
NOW.
&&
LAT...LON 4314 9408 4303 9442 4304 9443 4322 9445
4333 9426
TIME...MOT...LOC 0510Z 237DEG 32KT 4317 9431
$$
BEERENDS905
WWUS53 KDMX 100516
SVSDMX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
1216 AM CDT SUN APR 10 2011
IAC109-100530-
/O.CON.KDMX.TO.W.0031.000000T0000Z-110410T0530Z/
KOSSUTH IA-
1216 AM CDT SUN APR 10 2011
...A TORNADO WARNING REMAINS IN EFFECT FOR CENTRAL KOSSUTH COUNTY
UNTIL 1230 AM CDT...
AT 1211 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
STORM WAS LOCATED 8 MILES NORTH OF ALGONA...MOVING NORTHEAST AT 50
MPH.
LOCATIONS IMPACTED INCLUDE...
MAINLY RURAL AREAS OF CENTRAL KOSSUTH COUNTY.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
THIS IS A DANGEROUS STORM. IMMEDIATELY SEEK SHELTER IN A BASEMENT...
OR IN AN INTERIOR ROOM OF A REINFORCED BUILDING. STAY AWAY FROM
WINDOWS.
IF YOU ARE OUTSIDE...IN A MOBILE HOME...OR IN A VEHICLE...SEEK
SHELTER IN A NEARBY REINFORCED BUILDING. AS A LAST RESORT...FIND THE
LOWEST SPOT AVAILABLE AND COVER YOUR HEAD.
IN ADDITION TO THE TORNADO...THIS STORM IS ALSO EXPECTED TO PRODUCE
GOLF BALL SIZED HAIL AND WIDESPREAD DESTRUCTIVE WINDS.
TORNADOES ARE DIFFICULT TO SEE AT NIGHT...ACT QUICKLY. TAKE COVER
NOW.
&&
LAT...LON 4316 9410 4310 9427 4314 9436 4326 9439
4333 9426
TIME...MOT...LOC 0516Z 239DEG 43KT 4321 9420
$$
BEERENDS651
WWUS53 KDMX 100526
SVSDMX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
1226 AM CDT SUN APR 10 2011
IAC109-100535-
/O.EXP.KDMX.TO.W.0031.000000T0000Z-110410T0530Z/
KOSSUTH IA-
1226 AM CDT SUN APR 10 2011
...THE TORNADO WARNING FOR CENTRAL KOSSUTH COUNTY WILL EXPIRE AT 1230
AM CDT...
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED. HOWEVER SMALL
HAIL IS STILL POSSIBLE WITH THIS THUNDERSTORM.
IN ADDITION...STRONG THUNDERSTORMS MAY REDEVELOP...AND A TORNADO
WATCH REMAINS IN EFFECT UNTIL 5 AM.
REMEMBER...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR
NORTHEASTERN KOSSUTH COUNTY UNTIL 115 AM.
LAT...LON 4316 9410 4310 9427 4314 9436 4326 9439
4333 9426
TIME...MOT...LOC 0525Z 239DEG 43KT 4324 9405
$$
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, 10:28 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, 11:58 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.