Alert archive / Iowa / Tornado Warnings in 2011
Tornado Warning 7, NWS Omaha, NE
NWS Omaha, NE issued this tornado warning at Mar 22, 2011, 5:31 PM CDT for Harrison County, Shelby County, Iowa. It was in force for 29 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
- Mar 22, 2011, 5:31 PM CDT (22:31 UTC)
- Expired
- Mar 22, 2011, 6:00 PM CDT
- In force
- 29 min
- Issued by
- NWS Omaha, NE
- Area
- Storm-based polygon
Counties Harrison County, IA, Shelby County, IA
The radar
The Omaha radar (KOAX), 87 km from the middle of the area, began a volume at 22:33 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 |
|---|---|---|---|
| Mar 22, 2:03 PM CDT | Tornado Watch | SPC | 7 hr |
The nearest sounding before it
Omaha, NE (KOAX), launched 12:00Z, 10.5 hours before the alert went out and 87 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
- 486 J/kg
- Mixed-layer CIN
- -475 J/kg
- Mixed-layer LCL
- 777 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 477 m²/s²
- 0-3 km storm-relative helicity
- 501 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
267 WFUS53 KOAX 222231 TOROAX IAC085-165-222300- /O.NEW.KOAX.TO.W.0007.110322T2231Z-110322T2300Z/ BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA 531 PM CDT TUE MAR 22 2011 THE NATIONAL WEATHER SERVICE IN OMAHA HAS ISSUED A * TORNADO WARNING FOR... NORTHEASTERN HARRISON COUNTY IN SOUTHWEST IOWA... NORTHWESTERN SHELBY COUNTY IN SOUTHWEST IOWA... * UNTIL 600 PM CDT * AT 528 PM CDT...WEATHER SERVICE METEOROLOGISTS DETECTED A A TORNADO 8 MILES WEST OF EARLING...OR 41 MILES NORTHEAST OF OMAHA. DOPPLER RADAR SHOWED THIS TORNADO MOVING NORTHEAST AT 40 MPH. * LOCATIONS IMPACTED INCLUDE... EARLING...DEFIANCE AND WESTPHALIA. THE WARNED AREA INCLUDES HIGHWAY 59 IN IOWA BETWEEN MILE MARKERS 85 AND 91. THIS WARNING REPLACES THE WARNING ISSUED EARLIER FOR SHELBY COUNTY. PRECAUTIONARY/PREPAREDNESS ACTIONS... TO REPEAT...A TORNADO IS ON THE GROUND. 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 4160 9556 4179 9560 4186 9556 4186 9514 TIME...MOT...LOC 2230Z 219DEG 34KT 4177 9556 $$ FOBERT
2 follow-up statements
654 WWUS53 KOAX 222239 SVSOAX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA 539 PM CDT TUE MAR 22 2011 IAC085-222249- /O.CAN.KOAX.TO.W.0007.000000T0000Z-110322T2300Z/ HARRISON IA- 539 PM CDT TUE MAR 22 2011 ...THE TORNADO WARNING FOR NORTHEASTERN HARRISON COUNTY IS CANCELLED... THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED AREA. LAT...LON 4160 9556 4186 9556 4186 9514 TIME...MOT...LOC 2239Z 219DEG 34KT 4183 9547 $$ IAC165-222300- /O.CON.KOAX.TO.W.0007.000000T0000Z-110322T2300Z/ SHELBY IA- 539 PM CDT TUE MAR 22 2011 ...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHWESTERN SHELBY COUNTY UNTIL 600 PM CDT... AT 538 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS STORM WAS LOCATED NEAR EARLING...OR 48 MILES NORTHEAST OF OMAHA...MOVING NORTHEAST AT 40 MPH. LOCATIONS IMPACTED INCLUDE... DEFIANCE. 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 4160 9556 4186 9556 4186 9514 TIME...MOT...LOC 2239Z 219DEG 34KT 4183 9547 $$ FOBERT
092 WWUS53 KOAX 222256 SVSOAX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA 556 PM CDT TUE MAR 22 2011 IAC165-222306- /O.EXP.KOAX.TO.W.0007.000000T0000Z-110322T2300Z/ SHELBY IA- 556 PM CDT TUE MAR 22 2011 ...THE TORNADO WARNING FOR NORTHWESTERN SHELBY COUNTY WILL EXPIRE AT 600 PM CDT... THE STRONGEST PART OF THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED AREA. LAT...LON 4160 9556 4186 9556 4186 9514 TIME...MOT...LOC 2256Z 219DEG 34KT 4195 9533 $$ FOBERT
The office that day
Everything else NWS Omaha, NE issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 22, 4:10 PM CDT | Severe Thunderstorm Warning | OAX | Fremont, Mills | 50 min |
| Mar 22, 4:48 PM CDT | Severe Thunderstorm Warning | OAX | Harrison | 42 min |
| Mar 22, 4:53 PM CDT | Tornado Warning | OAX | Harrison | 37 min |
| Mar 22, 4:57 PM CDT | Severe Thunderstorm Warning | OAX | Montgomery, Pottawattamie | 33 min |
| Mar 22, 5:03 PM CDT | Tornado Warning | OAX | Harrison, Pottawattamie | 27 min |
| Mar 22, 5:08 PM CDT | Tornado Warning | OAX | Montgomery | 22 min |
| Mar 22, 5:19 PM CDT | Tornado Warning | OAX | Shelby | 26 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.