Alert archive / Iowa / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 8, NWS La Crosse, WI
NWS La Crosse, WI issued this severe thunderstorm warning at Apr 9, 2011, 11:15 PM CDT for Howard County, Winneshiek County, Iowa; Fillmore County, Minnesota. It was in force for 45 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, 11:15 PM CDT (04:15 UTC)
- Expired
- Apr 10, 2011, 12:00 AM CDT
- In force
- 45 min
- Issued by
- NWS La Crosse, WI
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Howard County, IA, Winneshiek County, IA, Fillmore County, MN
The radar
The La Crosse radar (KARX), 94 km from the middle of the area, began a volume at 04:17 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 |
| Apr 9, 11:01 PM CDT | Tornado Watch | SPC | 5 hr |
The nearest sounding before it
Minneapolis, MN (KMPX), launched 00:00Z, 4.3 hours before the alert went out and 189 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.
946 WUUS53 KARX 100415 SVRARX IAC089-191-MNC045-100500- /O.NEW.KARX.SV.W.0008.110410T0415Z-110410T0500Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE LA CROSSE WI 1115 PM CDT SAT APR 9 2011 THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... HOWARD COUNTY IN NORTHEAST IOWA... NORTHWESTERN WINNESHIEK COUNTY IN NORTHEAST IOWA... SOUTH CENTRAL FILLMORE COUNTY IN SOUTHEAST MINNESOTA... * UNTIL MIDNIGHT CDT * AT 1113 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM LOCATED NEAR SARATOGA...OR 17 MILES WEST OF CRESCO...MOVING NORTHEAST AT 25 MPH. THIS STORM CAN PRODUCE QUARTER SIZE HAIL AND DAMAGING WINDS IN EXCESS OF 60 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... HAYDEN PRAIRIE AROUND 1125 PM... DAVIS CORNERS AND CHESTER AROUND 1130 PM... LIME SPRINGS AROUND 1135 PM... BONAIR AND VERNON SPRINGS AROUND 1140 PM... CRESCO AND VERNON SPRINGS COUNTY PARK AROUND 1145 PM... COUNTY ROADS A 23 AND V 58 AND BRISTOL AROUND 1150 PM... GRANGER AROUND 1155 PM... PRECAUTIONARY/PREPAREDNESS ACTIONS... IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR LARGE HAIL AND DAMAGING WINDS. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS. A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA. SEVERE THUNDERSTORMS OCCASIONALLY PRODUCE TORNADOES...AND CAN DO SO QUICKLY. MOVE INTO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. A TORNADO WATCH REMAINS IN EFFECT UNTIL 500 AM SUNDAY MORNING FOR NORTHEASTERN IOWA AND SOUTHEAST MINNESOTA AND SOUTHWESTERN WISCONSIN. && LAT...LON 4361 9217 4335 9196 4326 9241 4342 9252 TIME...MOT...LOC 0415Z 245DEG 24KT 4336 9243 WIND...HAIL 60MPH 1.00IN $$ HALBACH
3 follow-up statements
282 WWUS53 KARX 100427 SVSARX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE LA CROSSE WI 1127 PM CDT SAT APR 9 2011 IAC089-191-MNC045-100500- /O.CON.KARX.SV.W.0008.000000T0000Z-110410T0500Z/ HOWARD IA-WINNESHIEK IA-FILLMORE MN- 1127 PM CDT SAT APR 9 2011 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTH CENTRAL FILLMORE...NORTHWESTERN WINNESHIEK AND HOWARD COUNTIES UNTIL MIDNIGHT CDT... AT 1122 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM LOCATED NEAR DAVIS CORNERS...OR 9 MILES WEST OF CRESCO...MOVING NORTHEAST AT 40 MPH. THIS STORM CAN PRODUCE QUARTER SIZE HAIL AND DAMAGING WINDS IN EXCESS OF 60 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... VERNON SPRINGS COUNTY PARK AROUND 1130 PM... CRESCO AND COUNTY ROADS A 23 AND V 58 AROUND 1135 PM... GRANGER AND STATE ROAD 9 AND 290TH STREET AROUND 1140 PM... KENDALLVILLE AND COUNTY ROADS W 14 AND A 34 AROUND 1145 PM... PRECAUTIONARY/PREPAREDNESS ACTIONS... IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR LARGE HAIL AND DAMAGING WINDS. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS. A TORNADO WATCH REMAINS IN EFFECT UNTIL 500 AM SUNDAY MORNING FOR NORTHEASTERN IOWA AND SOUTHEAST MINNESOTA AND SOUTHWESTERN WISCONSIN. && LAT...LON 4361 9217 4335 9196 4326 9241 4342 9252 TIME...MOT...LOC 0427Z 247DEG 33KT 4340 9224 WIND...HAIL 60MPH 1.00IN $$ HALBACH
372 WWUS53 KARX 100438 SVSARX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE LA CROSSE WI 1138 PM CDT SAT APR 9 2011 IAC089-191-MNC045-100500- /O.CON.KARX.SV.W.0008.000000T0000Z-110410T0500Z/ HOWARD IA-WINNESHIEK IA-FILLMORE MN- 1138 PM CDT SAT APR 9 2011 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTH CENTRAL FILLMORE...NORTHWESTERN WINNESHIEK AND NORTHEASTERN HOWARD COUNTIES UNTIL MIDNIGHT CDT... AT 1136 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM LOCATED NEAR COUNTY ROADS A 23 AND V 58...OR 6 MILES NORTH OF CRESCO...MOVING NORTHEAST AT 45 MPH. THIS STORM CAN PRODUCE QUARTER SIZE HAIL AND DAMAGING WINDS IN EXCESS OF 60 MPH. PRECAUTIONARY/PREPAREDNESS ACTIONS... IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR LARGE HAIL AND DAMAGING WINDS. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS. A TORNADO WATCH REMAINS IN EFFECT UNTIL 500 AM SUNDAY MORNING FOR NORTHEASTERN IOWA AND SOUTHEAST MINNESOTA AND SOUTHWESTERN WISCONSIN. && LAT...LON 4350 9238 4361 9217 4335 9196 4329 9229 TIME...MOT...LOC 0438Z 244DEG 38KT 4347 9211 WIND...HAIL 60MPH 1.00IN $$ HALBACH
696 WWUS53 KARX 100451 SVSARX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE LA CROSSE WI 1151 PM CDT SAT APR 9 2011 IAC089-191-MNC045-100502- /O.EXP.KARX.SV.W.0008.000000T0000Z-110410T0500Z/ HOWARD IA-WINNESHIEK IA-FILLMORE MN- 1151 PM CDT SAT APR 9 2011 ...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL FILLMORE... NORTHWESTERN WINNESHIEK AND NORTHEASTERN HOWARD COUNTIES WILL EXPIRE AT MIDNIGHT CDT... THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED AND MOVED OUT OF THE WARNED AREA. A TORNADO WATCH REMAINS IN EFFECT UNTIL 500 AM CDT SUNDAY MORNING FOR NORTHEASTERN IOWA AND SOUTHEAST MINNESOTA AND SOUTHWESTERN WISCONSIN. LAT...LON 4350 9238 4361 9217 4335 9196 4329 9229 TIME...MOT...LOC 0452Z 244DEG 38KT 4353 9192 $$ HALBACH
The office that day
Everything else NWS La Crosse, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 9, 10:53 PM CDT | Tornado Warning | ARX | Chickasaw, Floyd, Howard, Mitchell | 37 min |
| Apr 9, 11:08 PM CDT | Severe Thunderstorm Warning | ARX | Mitchell | 52 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 |
| Apr 10, 1:44 AM CDT | Areal Flood Advisory | ARX | Fillmore, Houston, Mower, Olmsted, Winona | 3 hr |
| Apr 10, 4:24 PM CDT | Severe Thunderstorm Warning | ARX | Winona | 41 min |
| Apr 10, 4:32 PM CDT | Tornado Warning | ARX | Houston | 43 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 2011Severe Thunderstorm Warnings in Minnesota, 2011Every severe thunderstorm warning 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.