Alert archive / Iowa / Tornado Warnings in 2011
Tornado Warning 23, NWS Omaha, NE
NWS Omaha, NE issued this tornado warning at Jun 26, 2011, 7:54 PM CDT for Harrison County, Monona County, Iowa. It was in force for 23 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
- Jun 26, 2011, 7:54 PM CDT (00:54 UTC)
- Expired
- Jun 26, 2011, 8:17 PM CDT
- In force
- 23 min
- Issued by
- NWS Omaha, NE
- Area
- Storm-based polygon
Counties Harrison County, IA, Monona County, IA
The radar
The Omaha radar (KOAX), 75 km from the middle of the area, began a volume at 00:54 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.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jun 26, 4:56 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 0.9 hours before the alert went out and 75 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
- 2873 J/kg
- Mixed-layer CIN
- -31 J/kg
- Mixed-layer LCL
- 501 m above ground
- 0-6 km bulk shear
- 51 kt
- 0-1 km storm-relative helicity
- 248 m²/s²
- 0-3 km storm-relative helicity
- 308 m²/s²
- Significant tornado parameter
- 6.2
- Supercell composite
- 26.5
The text
As transmitted, in the capitals the NWS used until 2016.
722
WFUS53 KOAX 270054
TOROAX
IAC085-133-270130-
/O.NEW.KOAX.TO.W.0023.110627T0054Z-110627T0130Z/
BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
754 PM CDT SUN JUN 26 2011
THE NATIONAL WEATHER SERVICE IN OMAHA HAS ISSUED A
* TORNADO WARNING FOR...
NORTHERN HARRISON COUNTY IN SOUTHWEST IOWA...
SOUTHEASTERN MONONA COUNTY IN WEST CENTRAL IOWA...
* UNTIL 830 PM CDT
* AT 750 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
STORM WAS LOCATED NEAR PISGAH...OR 40 MILES NORTH OF OMAHA...AND
MOVING EAST AT 40 MPH.
* LOCATIONS IMPACTED INCLUDE...
PREPARATION CANYON STATE PARK AND DUNLAP.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.
&&
LAT...LON 4179 9605 4192 9600 4192 9567 4187 9567
4186 9556 4174 9556
TIME...MOT...LOC 0055Z 274DEG 37KT 4185 9593
$$
CHERMOK3 follow-up statements
657
WWUS53 KOAX 270101
SVSOAX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
801 PM CDT SUN JUN 26 2011
IAC085-133-270130-
/O.CON.KOAX.TO.W.0023.000000T0000Z-110627T0130Z/
MONONA IA-HARRISON IA-
801 PM CDT SUN JUN 26 2011
...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHEASTERN HARRISON AND
SOUTHEASTERN MONONA COUNTIES UNTIL 830 PM CDT...
AT 759 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS
DANGEROUS STORM WAS LOCATED 6 MILES EAST OF PISGAH...OR 40 MILES
NORTH OF OMAHA...MOVING EAST AT 60 MPH.
LOCATIONS IMPACTED INCLUDE...
DUNLAP.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.
&&
LAT...LON 4178 9589 4190 9585 4192 9567 4187 9567
4186 9556 4174 9556
TIME...MOT...LOC 0102Z 275DEG 54KT 4182 9576
$$
CHERMOK/MAYES996 WWUS53 KOAX 270108 SVSOAX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA 808 PM CDT SUN JUN 26 2011 IAC133-270119- /O.CAN.KOAX.TO.W.0023.000000T0000Z-110627T0130Z/ MONONA IA- 808 PM CDT SUN JUN 26 2011 ...THE TORNADO WARNING FOR SOUTHEASTERN MONONA COUNTY IS CANCELLED... THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED AREA. LAT...LON 4177 9578 4186 9575 4186 9556 4174 9556 TIME...MOT...LOC 0109Z 275DEG 54KT 4181 9562 $$ IAC085-270130- /O.CON.KOAX.TO.W.0023.000000T0000Z-110627T0130Z/ HARRISON IA- 808 PM CDT SUN JUN 26 2011 ...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHEASTERN HARRISON COUNTY UNTIL 830 PM CDT... AT 804 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS STORM WAS LOCATED 10 MILES SOUTHEAST OF MOORHEAD...OR 41 MILES NORTH OF OMAHA...MOVING EAST AT 60 MPH. LOCATIONS IMPACTED INCLUDE... MAINLY RURAL AREAS OF NORTHEASTERN HARRISON COUNTY. PRECAUTIONARY/PREPAREDNESS ACTIONS... TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT YOURSELF FROM FLYING DEBRIS. && LAT...LON 4177 9578 4186 9575 4186 9556 4174 9556 TIME...MOT...LOC 0109Z 275DEG 54KT 4181 9562 $$ CHERMOK/MAYES
355 WWUS53 KOAX 270117 SVSOAX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA 817 PM CDT SUN JUN 26 2011 IAC085-270127- /O.CAN.KOAX.TO.W.0023.000000T0000Z-110627T0130Z/ HARRISON IA- 817 PM CDT SUN JUN 26 2011 ...THE TORNADO WARNING FOR NORTHEASTERN HARRISON COUNTY IS CANCELLED... THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED AND MOVED OUT OF THE WARNED AREA. HOWEVER GUSTY WINDS ARE STILL POSSIBLE WITH THIS THUNDERSTORM. REMEMBER...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EASTERN HARRISON COUNTY UNTIL 845 PM. LAT...LON 4177 9578 4186 9575 4186 9556 4174 9556 TIME...MOT...LOC 0117Z 275DEG 54KT 4180 9546 $$ CHERMOK/MAYES
The office that day
Everything else NWS Omaha, NE issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 26, 7:22 PM CDT | Severe Thunderstorm Warning | OAX | Monona | 53 min |
| Jun 26, 7:33 PM CDT | Severe Thunderstorm Warning | OAX | Harrison, Monona, Pottawattamie, Shelby | 42 min |
| Jun 26, 8:07 PM CDT | Severe Thunderstorm Warning | OAX | Harrison, Monona, Pottawattamie, Shelby | 38 min |
| Jun 26, 8:22 PM CDT | Severe Thunderstorm Warning | OAX | Mills, Pottawattamie | 38 min |
| Jun 26, 8:33 PM CDT | Severe Thunderstorm Warning | OAX | Mills, Pottawattamie | 42 min |
| Jun 26, 8:41 PM CDT | Severe Thunderstorm Warning | OAX | Mills, Montgomery, Pottawattamie, Shelby | 49 min |
| Jun 26, 8:45 PM CDT | Areal Flood Advisory | OAX | Harrison, Monona, Pottawattamie, Shelby | 3 hr |
| Jun 26, 8:53 PM CDT | Severe Thunderstorm Warning | OAX | Fremont, Mills, Montgomery | 52 min |
| Jun 26, 9:08 PM CDT | Areal Flood Advisory | OAX | Fremont, Harrison, Mills, Montgomery, Pottawattamie, Shelby | 2 hr |
| Jun 26, 9:31 PM CDT | Severe Thunderstorm Warning | OAX | Fremont, Mills, Montgomery, Page | 44 min |
| Jun 26, 10:01 PM CDT | Areal Flood Advisory | OAX | Fremont, Montgomery, Page | 86 min |
| Jun 27, 12:30 AM CDT | River Flood Warning | OAX | Page | 14 hr |
| Jun 27, 12:49 AM CDT | Severe Thunderstorm Warning | OAX | Fremont, Page | 56 min |
| Jun 27, 1:25 AM CDT | River Flood Warning | OAX | Fremont | 38 hr |
| Jun 27, 1:25 AM CDT | River Flood Warning | OAX | Fremont | 5 hr |
| Jun 27, 2:15 AM CDT | Severe Thunderstorm Warning | OAX | Fremont, Mills | 45 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.