Alert archive / Iowa / Tornado Warnings in 2011
Tornado Warning 51, NWS Des Moines, IA
NWS Des Moines, IA issued this tornado warning at Jul 5, 2011, 5:52 PM CDT for Boone County, Webster County, Iowa. It was in force for 23 min. 1 report 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
- Jul 5, 2011, 5:52 PM CDT (22:52 UTC)
- Expired
- Jul 5, 2011, 6:15 PM CDT
- In force
- 23 min
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
Counties Boone County, IA, Webster County, IA
The radar
The Des Moines radar (KDMX), 63 km from the middle of the area, began a volume at 22:52 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 |
|---|---|---|---|
| Jul 5, 6:15 PM CDT | TSTM WND DMG | 1 N Boxholm, IA | CORN FLATTENED BY WIND GUST. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Omaha, NE (KOAX), launched 12:00Z, 10.9 hours before the alert went out and 212 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
- 939 J/kg
- Mixed-layer CIN
- -259 J/kg
- Mixed-layer LCL
- 1038 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 9 m²/s²
- 0-3 km storm-relative helicity
- 43 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.8
The text
As transmitted, in the capitals the NWS used until 2016.
916
WFUS53 KDMX 052252
TORDMX
IAC015-187-052315-
/O.NEW.KDMX.TO.W.0051.110705T2252Z-110705T2315Z/
BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
552 PM CDT TUE JUL 5 2011
THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A
* TORNADO WARNING FOR...
NORTHWESTERN BOONE COUNTY IN CENTRAL IOWA...
SOUTH CENTRAL WEBSTER COUNTY IN CENTRAL IOWA...
* UNTIL 615 PM CDT
* AT 547 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 GOWRIE...OR 15 MILES SOUTH OF
FORT DODGE...AND MOVING SOUTH AT 30 MPH.
* LOCATIONS IMPACTED INCLUDE...
DAYTON...BOXHOLM...PILOT MOUND AND FRASER.
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 4236 9404 4209 9394 4205 9416 4214 9417
4221 9417 4221 9418 4233 9420
TIME...MOT...LOC 2252Z 342DEG 27KT 4226 9410
$$
ZOGG2 follow-up statements
884 WWUS53 KDMX 052258 SVSDMX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 558 PM CDT TUE JUL 5 2011 IAC015-187-052315- /O.CON.KDMX.TO.W.0051.000000T0000Z-110705T2315Z/ BOONE IA-WEBSTER IA- 558 PM CDT TUE JUL 5 2011 ...A TORNADO WARNING REMAINS IN EFFECT FOR SOUTH CENTRAL WEBSTER AND NORTHWESTERN BOONE COUNTIES UNTIL 615 PM CDT... AT 556 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS STORM WAS LOCATED 10 MILES EAST OF GOWRIE...OR 18 MILES SOUTH OF FORT DODGE...MOVING SOUTH AT 25 MPH. LOCATIONS IMPACTED INCLUDE... BOXHOLM...PILOT MOUND AND FRASER. PRECAUTIONARY/PREPAREDNESS ACTIONS... THIS IS A DANGEROUS STORM. IMMEDIATELY SEEK SHELTER IN A BASEMENT... OR IN AN INTERIOR ROOM OF A REINFORCED BUILDING. STAY AWAY FROM WINDOWS. IF YOU ARE OUTSIDE...IN A MOBILE HOME...OR IN A VEHICLE...SEEK SHELTER IN A NEARBY REINFORCED BUILDING. AS A LAST RESORT...FIND THE LOWEST SPOT AVAILABLE AND COVER YOUR HEAD. && LAT...LON 4231 9419 4234 9404 4209 9394 4205 9416 TIME...MOT...LOC 2259Z 339DEG 23KT 4224 9408 $$ ZOGG
998 WWUS53 KDMX 052309 SVSDMX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 609 PM CDT TUE JUL 5 2011 IAC015-187-052319- /O.EXP.KDMX.TO.W.0051.000000T0000Z-110705T2315Z/ BOONE IA-WEBSTER IA- 609 PM CDT TUE JUL 5 2011 ...THE TORNADO WARNING FOR SOUTH CENTRAL WEBSTER AND NORTHWESTERN BOONE COUNTIES WILL EXPIRE AT 615 PM CDT... THE TORNADO THREAT HAS DIMINISHED...THEREFORE THE TORNADO WARNING HAS EXPIRED. HOWEVER...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR THE AREA. HOWEVER GUSTY WINDS ARE STILL POSSIBLE WITH THIS THUNDERSTORM. LAT...LON 4231 9419 4234 9404 4209 9394 4205 9416 TIME...MOT...LOC 2309Z 339DEG 23KT 4218 9405 $$ ZOGG
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 5, 3:10 PM CDT | Severe Thunderstorm Warning | DMX | Hancock, Kossuth | 27 min |
| Jul 5, 3:36 PM CDT | Severe Thunderstorm Warning | DMX | Humboldt, Kossuth | 39 min |
| Jul 5, 4:45 PM CDT | Severe Thunderstorm Warning | DMX | Hamilton, Humboldt, Webster, Wright | 45 min |
| Jul 5, 5:43 PM CDT | Severe Thunderstorm Warning | DMX | Boone, Greene, Webster | 47 min |
| Jul 5, 6:28 PM CDT | Severe Thunderstorm Warning | DMX | Boone, Dallas | 47 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.