Alert archive / Iowa / Tornado Warnings in 2011
Tornado Warning 37, NWS Des Moines, IA
NWS Des Moines, IA issued this tornado warning at May 22, 2011, 2:42 PM CDT for Black Hawk County, Bremer County, Iowa. It was in force for 33 min. 6 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
- May 22, 2011, 2:42 PM CDT (19:42 UTC)
- Expired
- May 22, 2011, 3:15 PM CDT
- In force
- 33 min
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
Counties Black Hawk County, IA, Bremer County, IA
The radar
The La Crosse radar (KARX), 154 km from the middle of the area, began a volume at 19:43 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 |
|---|---|---|---|
| May 22, 2:47 PM CDT | FUNNEL CLOUD | 5 Nnw Cedar Falls, IA | TRAINED SPOTTER REPORTED FUNNEL CLOUD NORTHWEST OF CEDAR FALLS... |
| May 22, 2:50 PM CDT | FUNNEL CLOUD | 2 S Waverly, IA | |
| May 22, 2:50 PM CDT | HAIL 1 | Tripoli, IA | |
| May 22, 3:13 PM CDT | FUNNEL CLOUD | 2 Se Tripoli, IA | FUNNEL CLOUD REACHED ABOUT 3/4 OF THE WAY TO THE GROUND BEFORE RETREATING INTO THE WALL CLOUD. |
| May 22, 3:15 PM CDT | HAIL 1 | Tripoli, IA | |
| May 22, 3:25 PM CDT | HAIL 2 | Sumner, IA | UTILITY WORKERS REPORT. EAST SIDE OF SUMNER. |
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 |
|---|---|---|---|
| May 22, 12:51 PM CDT | Tornado Watch | SPC | 10 hr |
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 7.7 hours before the alert went out and 195 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
- 1775 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 233 m²/s²
- 0-3 km storm-relative helicity
- 287 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
005
WFUS53 KDMX 221942
TORDMX
IAC013-017-222015-
/O.NEW.KDMX.TO.W.0037.110522T1942Z-110522T2015Z/
BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
242 PM CDT SUN MAY 22 2011
THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A
* TORNADO WARNING FOR...
NORTHWESTERN BLACK HAWK COUNTY IN NORTHEAST IOWA...
BREMER COUNTY IN NORTHEAST IOWA...
* UNTIL 315 PM CDT
* AT 238 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
STORM WAS LOCATED 6 MILES NORTHWEST OF CEDAR FALLS...OR 11 MILES
NORTHWEST OF WATERLOO...AND MOVING NORTHEAST AT 45 MPH.
* LOCATIONS IMPACTED INCLUDE...
WAVERLY...DENVER...TRIPOLI...SUMNER...JANESVILLE...READLYN AND
FREDERIKA.
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 4253 9253 4256 9256 4267 9255 4291 9231
4291 9208 4290 9207 4275 9208
TIME...MOT...LOC 1942Z 226DEG 37KT 4261 9249
$$
COGIL2 follow-up statements
748
WWUS53 KDMX 221951
SVSDMX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
251 PM CDT SUN MAY 22 2011
IAC013-017-222015-
/O.CON.KDMX.TO.W.0037.000000T0000Z-110522T2015Z/
BLACK HAWK IA-BREMER IA-
251 PM CDT SUN MAY 22 2011
...A TORNADO WARNING REMAINS IN EFFECT FOR BREMER AND NORTHWESTERN
BLACK HAWK COUNTIES UNTIL 315 PM CDT...
AT 246 PM CDT...TRAINED WEATHER SPOTTERS REPORTED A FUNNEL CLOUD. A
TORNADO MAY DEVELOP AT ANY TIME. THIS DANGEROUS STORM WAS LOCATED 7
MILES SOUTH OF WAVERLY...OR 12 MILES NORTHWEST OF WATERLOO...MOVING
NORTHEAST AT 45 MPH.
LOCATIONS IMPACTED INCLUDE...
WAVERLY...DENVER...TRIPOLI...SUMNER...READLYN AND FREDERIKA.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
THIS IS A DANGEROUS STORM. IMMEDIATELY SEEK SHELTER IN A BASEMENT...
OR IN AN INTERIOR ROOM OF A REINFORCED BUILDING. STAY AWAY FROM
WINDOWS.
IF YOU ARE OUTSIDE...IN A MOBILE HOME...OR IN A VEHICLE...SEEK
SHELTER IN A NEARBY REINFORCED BUILDING. AS A LAST RESORT...FIND THE
LOWEST SPOT AVAILABLE AND COVER YOUR HEAD.
&&
LAT...LON 4257 9245 4259 9255 4267 9255 4291 9231
4291 9208 4290 9207 4275 9208
TIME...MOT...LOC 1951Z 219DEG 38KT 4267 9245
$$
COGIL385
WWUS53 KDMX 222002
SVSDMX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
302 PM CDT SUN MAY 22 2011
IAC013-222012-
/O.CAN.KDMX.TO.W.0037.000000T0000Z-110522T2015Z/
BLACK HAWK IA-
302 PM CDT SUN MAY 22 2011
...THE TORNADO WARNING FOR NORTHWESTERN BLACK HAWK COUNTY IS
CANCELLED...
THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA.
LAT...LON 4265 9229 4267 9242 4275 9245 4291 9231
4291 9208 4290 9207 4275 9208
TIME...MOT...LOC 2002Z 226DEG 39KT 4274 9231
$$
IAC017-222015-
/O.CON.KDMX.TO.W.0037.000000T0000Z-110522T2015Z/
BREMER IA-
302 PM CDT SUN MAY 22 2011
...A TORNADO WARNING REMAINS IN EFFECT FOR BREMER COUNTY UNTIL 315 PM
CDT...
AT 259 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
STORM WAS LOCATED NEAR DENVER...OR 16 MILES NORTH OF WATERLOO...
MOVING NORTHEAST AT 45 MPH.
LOCATIONS IMPACTED INCLUDE...
TRIPOLI...SUMNER...READLYN AND FREDERIKA.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
THIS IS A DANGEROUS STORM. IMMEDIATELY SEEK SHELTER IN A BASEMENT...
OR IN AN INTERIOR ROOM OF A REINFORCED BUILDING. STAY AWAY FROM
WINDOWS.
IF YOU ARE OUTSIDE...IN A MOBILE HOME...OR IN A VEHICLE...SEEK
SHELTER IN A NEARBY REINFORCED BUILDING. AS A LAST RESORT...FIND THE
LOWEST SPOT AVAILABLE AND COVER YOUR HEAD.
&&
LAT...LON 4265 9229 4267 9242 4275 9245 4291 9231
4291 9208 4290 9207 4275 9208
TIME...MOT...LOC 2002Z 226DEG 39KT 4274 9231
$$
COGILThe office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 21, 7:28 PM CDT | Severe Thunderstorm Warning | DMX | Emmet | 32 min |
| May 21, 7:51 PM CDT | Severe Thunderstorm Warning | DMX | Adair | 39 min |
| May 21, 7:57 PM CDT | Severe Thunderstorm Warning | DMX | Emmet | 33 min |
| May 21, 8:21 PM CDT | Severe Thunderstorm Warning | DMX | Guthrie | 24 min |
| May 21, 8:39 PM CDT | Severe Thunderstorm Warning | DMX | Dallas, Madison | 36 min |
| May 21, 8:41 PM CDT | Severe Thunderstorm Warning | DMX | Crawford | 34 min |
| May 21, 8:59 PM CDT | Severe Thunderstorm Warning | DMX | Clarke, Decatur, Lucas, Warren, Wayne | 31 min |
| May 21, 9:03 PM CDT | Severe Thunderstorm Warning | DMX | Madison, Warren | 27 min |
| May 21, 9:44 PM CDT | Severe Thunderstorm Warning | DMX | Appanoose, Lucas, Monroe, Wayne | 31 min |
| May 21, 10:19 PM CDT | Severe Thunderstorm Warning | DMX | Mahaska, Poweshiek | 26 min |
| May 22, 9:19 AM CDT | River Flood Warning | DMX | Emmet | 17 days |
| May 22, 9:19 AM CDT | River Flood Warning | DMX | Humboldt | 11 days |
| May 22, 9:19 AM CDT | River Flood Warning | DMX | Humboldt, Kossuth | 12 days |
| May 22, 1:38 PM CDT | Severe Thunderstorm Warning | DMX | Jasper, Poweshiek, Tama | 52 min |
| May 22, 2:02 PM CDT | Severe Thunderstorm Warning | DMX | Mahaska, Poweshiek | 43 min |
| May 22, 2:23 PM CDT | Tornado Warning | DMX | Poweshiek | 17 min |
| May 22, 2:29 PM CDT | Severe Thunderstorm Warning | DMX | Black Hawk, Bremer, Butler, Grundy | 46 min |
| May 22, 3:14 PM CDT | Tornado Warning | DMX | Bremer | 31 min |
| May 22, 4:12 PM CDT | Severe Thunderstorm Warning | DMX | Appanoose, Davis, Wapello | 27 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.