Alert archive / Iowa / Tornado Warnings in 2011
Tornado Warning 2, NWS La Crosse, WI
NWS La Crosse, WI issued this tornado warning at Apr 9, 2011, 10:53 PM CDT for 4 counties in Iowa. It was in force for 37 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
- Apr 9, 2011, 10:53 PM CDT (03:53 UTC)
- Expired
- Apr 9, 2011, 11:30 PM CDT
- In force
- 37 min
- Issued by
- NWS La Crosse, WI
- Area
- Storm-based polygon
Counties Chickasaw County, IA, Floyd County, IA, Howard County, IA, Mitchell County, IA
The radar
The La Crosse radar (KARX), 130 km from the middle of the area, began a volume at 03:54 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 |
|---|---|---|---|
| Apr 9, 7:42 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Minneapolis, MN (KMPX), launched 00:00Z, 3.9 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
- 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.
757 WFUS53 KARX 100353 TORARX IAC037-067-089-131-100430- /O.NEW.KARX.TO.W.0002.110410T0353Z-110410T0430Z/ BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE LA CROSSE WI 1053 PM CDT SAT APR 9 2011 THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A * TORNADO WARNING FOR... NORTHEASTERN FLOYD COUNTY IN NORTH CENTRAL IOWA... SOUTHEASTERN MITCHELL COUNTY IN NORTH CENTRAL IOWA... NORTHWESTERN CHICKASAW COUNTY IN NORTHEAST IOWA... SOUTHWESTERN HOWARD COUNTY IN NORTHEAST IOWA... * UNTIL 1130 PM CDT * AT 1050 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A TORNADO NEAR HOWARDVILLE...OR 8 MILES NORTH OF CHARLES CITY... MOVING NORTHEAST AT 35 MPH. * THE TORNADO WILL BE NEAR... COLWELL AND NEW HAVEN AROUND 1100 PM... COUNTY ROADS 17 AND T 72 AND DEERFIELD AROUND 1105 PM... COUNTY B 17 AND BELL AVENUE AROUND 1110 PM... ELMA AND RICEVILLE AROUND 1115 PM... PRECAUTIONARY/PREPAREDNESS ACTIONS... TAKE COVER IN A BASEMENT OR IN AN INTERIOR ROOM ON THE LOWEST FLOOR AND STAY AWAY FROM WINDOWS! CARS AND MOBILE HOMES SHOULD BE ABANDONED FOR A STURDY BUILDING. AS A LAST RESORT...LAY FLAT IN A DITCH AND COVER YOUR HEAD. && LAT...LON 4341 9251 4315 9234 4306 9276 4323 9286 TIME...MOT...LOC 0353Z 242DEG 29KT 4319 9269 $$ HALBACH
4 follow-up statements
181 WWUS53 KARX 100402 SVSARX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE LA CROSSE WI 1102 PM CDT SAT APR 9 2011 IAC037-067-089-131-100430- /O.CON.KARX.TO.W.0002.000000T0000Z-110410T0430Z/ MITCHELL IA-HOWARD IA-FLOYD IA-CHICKASAW IA- 1102 PM CDT SAT APR 9 2011 ...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHWESTERN CHICKASAW... NORTHEASTERN FLOYD...SOUTHWESTERN HOWARD AND SOUTHEASTERN MITCHELL COUNTIES UNTIL 1130 PM CDT... AT 1059 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A TORNADO LOCATED NEAR COLWELL COUNTY PARK...OR 8 MILES NORTH OF CHARLES CITY...MOVING NORTHEAST AT 30 MPH. IN ADDITION TO A TORNADO...THIS STORM CAN PRODUCE QUARTER SIZE HAIL AND DAMAGING WINDS IN EXCESS OF 60 MPH. * THE TORNADO WILL BE NEAR... COUNTY ROADS 17 AND T 72 AROUND 1110 PM... COUNTY B 17 AND BELL AVENUE AND DEERFIELD AROUND 1115 PM... RICEVILLE AND COUNTY ROADS B 28 AND V 18 AROUND 1120 PM... ELMA AND LYLAHS MARSH COUNTY PARK AROUND 1125 PM... PRECAUTIONARY/PREPAREDNESS ACTIONS... TAKE COVER IN A BASEMENT OR IN AN INTERIOR ROOM ON THE LOWEST FLOOR AND STAY AWAY FROM WINDOWS! CARS AND MOBILE HOMES SHOULD BE ABANDONED FOR A STURDY BUILDING. AS A LAST RESORT...LAY FLAT IN A DITCH AND COVER YOUR HEAD. A TORNADO WATCH REMAINS IN EFFECT UNTIL 500 AM SUNDAY MORNING FOR NORTHEASTERN IOWA AND SOUTHEAST MINNESOTA AND SOUTHWESTERN WISCONSIN. && LAT...LON 4341 9251 4315 9234 4306 9276 4323 9286 TIME...MOT...LOC 0403Z 246DEG 24KT 4319 9263 $$ HALBACH
491 WWUS53 KARX 100412 SVSARX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE LA CROSSE WI 1112 PM CDT SAT APR 9 2011 IAC037-067-089-131-100430- /O.CON.KARX.TO.W.0002.000000T0000Z-110410T0430Z/ MITCHELL IA-HOWARD IA-FLOYD IA-CHICKASAW IA- 1112 PM CDT SAT APR 9 2011 ...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHWESTERN CHICKASAW... NORTHEASTERN FLOYD...SOUTHWESTERN HOWARD AND SOUTHEASTERN MITCHELL COUNTIES UNTIL 1130 PM CDT... AT 1108 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A TORNADO LOCATED NEAR COUNTY ROADS 17 AND T 72...OR 11 MILES NORTH OF CHARLES CITY...MOVING NORTHEAST AT 30 MPH. IN ADDITION TO A TORNADO...THIS STORM CAN PRODUCE QUARTER SIZE HAIL AND DAMAGING WINDS IN EXCESS OF 60 MPH. * THE TORNADO WILL BE NEAR... RICEVILLE AND COUNTY ROADS B 28 AND V 18 AROUND 1120 PM... ELMA AND LYLAHS MARSH COUNTY PARK AROUND 1125 PM... PRECAUTIONARY/PREPAREDNESS ACTIONS... TAKE COVER IN A BASEMENT OR IN AN INTERIOR ROOM ON THE LOWEST FLOOR AND STAY AWAY FROM WINDOWS! CARS AND MOBILE HOMES SHOULD BE ABANDONED FOR A STURDY BUILDING. AS A LAST RESORT...LAY FLAT IN A DITCH AND COVER YOUR HEAD. A TORNADO WATCH REMAINS IN EFFECT UNTIL 500 AM SUNDAY MORNING FOR NORTHEASTERN IOWA AND SOUTHEAST MINNESOTA AND SOUTHWESTERN WISCONSIN. && LAT...LON 4331 9271 4341 9251 4315 9234 4309 9262 TIME...MOT...LOC 0413Z 246DEG 24KT 4324 9256 $$ HALBACH
020 WWUS53 KARX 100421 SVSARX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE LA CROSSE WI 1121 PM CDT SAT APR 9 2011 IAC067-131-100431- /O.CAN.KARX.TO.W.0002.000000T0000Z-110410T0430Z/ MITCHELL IA-FLOYD IA- 1121 PM CDT SAT APR 9 2011 ...THE TORNADO WARNING FOR NORTHEASTERN FLOYD AND SOUTHEASTERN MITCHELL COUNTIES IS CANCELLED... THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED AREA. A TORNADO WATCH REMAINS IN EFFECT UNTIL 500 AM CDT SUNDAY MORNING FOR NORTHEASTERN IOWA AND SOUTHEAST MINNESOTA AND SOUTHWESTERN WISCONSIN. A SEVERE THUNDERSTORM WATCH ALSO REMAINS IN EFFECT UNTIL 300 AM CDT SUNDAY MORNING FOR SOUTHEAST MINNESOTA AND WEST CENTRAL WISCONSIN. LAT...LON 4312 9251 4337 9256 4341 9251 4315 9234 TIME...MOT...LOC 0421Z 248DEG 36KT 4327 9242 $$ IAC037-089-100430- /O.CON.KARX.TO.W.0002.000000T0000Z-110410T0430Z/ HOWARD IA-CHICKASAW IA- 1121 PM CDT SAT APR 9 2011 ...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHWESTERN CHICKASAW AND SOUTHWESTERN HOWARD COUNTIES UNTIL 1130 PM CDT... AT 1117 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A TORNADO LOCATED NEAR ELMA...OR 15 MILES NORTHWEST OF NEW HAMPTON... MOVING EAST AT 40 MPH. IN ADDITION TO A TORNADO...THIS STORM CAN PRODUCE QUARTER SIZE HAIL AND DAMAGING WINDS IN EXCESS OF 60 MPH. PRECAUTIONARY/PREPAREDNESS ACTIONS... TAKE COVER IN A BASEMENT OR IN AN INTERIOR ROOM ON THE LOWEST FLOOR AND STAY AWAY FROM WINDOWS! CARS AND MOBILE HOMES SHOULD BE ABANDONED FOR A STURDY BUILDING. AS A LAST RESORT...LAY FLAT IN A DITCH AND COVER YOUR HEAD. A TORNADO WATCH REMAINS IN EFFECT UNTIL 500 AM SUNDAY MORNING FOR NORTHEASTERN IOWA AND SOUTHEAST MINNESOTA AND SOUTHWESTERN WISCONSIN. && LAT...LON 4312 9251 4337 9256 4341 9251 4315 9234 TIME...MOT...LOC 0421Z 248DEG 36KT 4327 9242 $$ HALBACH
322 WWUS53 KARX 100425 SVSARX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE LA CROSSE WI 1125 PM CDT SAT APR 9 2011 IAC037-089-100436- /O.EXP.KARX.TO.W.0002.000000T0000Z-110410T0430Z/ HOWARD IA-CHICKASAW IA- 1125 PM CDT SAT APR 9 2011 ...THE TORNADO WARNING FOR NORTHWESTERN CHICKASAW AND SOUTHWESTERN HOWARD COUNTIES WILL EXPIRE AT 1130 PM CDT... THE TORNADO THREAT HAS DIMINISHED...THEREFORE THE TORNADO WARNING HAS EXPIRED. HOWEVER...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR THE AREA. A TORNADO WATCH REMAINS IN EFFECT UNTIL 500 AM CDT SUNDAY MORNING FOR NORTHEASTERN IOWA AND SOUTHEAST MINNESOTA AND SOUTHWESTERN WISCONSIN. LAT...LON 4312 9251 4337 9256 4341 9251 4315 9234 TIME...MOT...LOC 0426Z 248DEG 36KT 4329 9235 $$ HALBACH
The office that day
Everything else NWS La Crosse, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 9, 11:08 PM CDT | Severe Thunderstorm Warning | ARX | Mitchell | 52 min |
| Apr 9, 11:15 PM CDT | Severe Thunderstorm Warning | ARX | Howard, Winneshiek | 45 min |
| Apr 10, 3:39 PM CDT | Severe Thunderstorm Warning | ARX | Howard | 41 min |
| Apr 10, 4:11 PM CDT | Severe Thunderstorm Warning | ARX | Winneshiek | 34 min |
| Apr 10, 5:03 PM CDT | Severe Thunderstorm Warning | ARX | Allamakee | 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.