Alert archive / Iowa / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 112, NWS La Crosse, WI
NWS La Crosse, WI issued this severe thunderstorm warning at Sep 4, 2012, 10:10 PM CDT for Clayton County, Fayette County, Iowa. It was in force for 65 min. 2 reports 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
- Sep 4, 2012, 10:10 PM CDT (03:10 UTC)
- Expired
- Sep 4, 2012, 11:15 PM CDT
- In force
- 65 min
- Issued by
- NWS La Crosse, WI
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Clayton County, IA, Fayette County, IA
The radar
The La Crosse radar (KARX), 107 km from the middle of the area, began a volume at 03:13 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 |
|---|---|---|---|
| Sep 4, 11:00 PM CDT | HAIL 1 | 6 Ssw Elkader, IA | |
| Sep 4, 11:05 PM CDT | HAIL 1.5 | Osborne, IA | OFF-DUTY DISPATCHER REPORTS HAIL ABOUT PING-PONG BALL SIZE |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Sep 4, 3:27 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
The nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 3.2 hours before the alert went out and 160 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
- 1890 J/kg
- Mixed-layer CIN
- -49 J/kg
- Mixed-layer LCL
- 1662 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- -23 m²/s²
- 0-3 km storm-relative helicity
- 44 m²/s²
- Significant tornado parameter
- -0.0
- Supercell composite
- -0.9
The text
As transmitted, in the capitals the NWS used until 2016.
641 WUUS53 KARX 050310 SVRARX IAC043-065-050415- /O.NEW.KARX.SV.W.0112.120905T0310Z-120905T0415Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE LA CROSSE WI 1010 PM CDT TUE SEP 4 2012 THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... CLAYTON COUNTY IN NORTHEAST IOWA... EAST CENTRAL FAYETTE COUNTY IN NORTHEAST IOWA... * UNTIL 1115 PM CDT * AT 1009 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM LOCATED NEAR GUNDER...OR 10 MILES NORTHWEST OF ELKADER...MOVING SOUTHEAST AT 15 MPH. THIS STORM CAN PRODUCE QUARTER SIZE HAIL AND DAMAGING WINDS IN EXCESS OF 60 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... WADENA AROUND 1020 PM... HIGHWAY 56 AND COUNTY W 70 AROUND 1030 PM... ST. OLAF AROUND 1035 PM... VOLGA AROUND 1045 PM... ELKADER AND THOMASVILLE AROUND 1050 PM... CLAYTON CENTER AND SAINT SEBALD AROUND 1055 PM... OSBORNE AROUND 1100 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. && LAT...LON 4284 9119 4269 9160 4297 9172 4304 9151 TIME...MOT...LOC 0310Z 321DEG 12KT 4294 9156 WIND...HAIL 60MPH 1.00IN $$ JW
4 follow-up statements
619 WWUS53 KARX 050331 SVSARX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE LA CROSSE WI 1031 PM CDT TUE SEP 4 2012 IAC043-065-050415- /O.CON.KARX.SV.W.0112.000000T0000Z-120905T0415Z/ FAYETTE IA-CLAYTON IA- 1031 PM CDT TUE SEP 4 2012 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR CLAYTON AND EAST CENTRAL FAYETTE COUNTIES UNTIL 1115 PM CDT... AT 1026 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM LOCATED NEAR HIGHWAY 56 AND COUNTY W 70...OR 6 MILES NORTHWEST OF ELKADER...MOVING SOUTHEAST AT 15 MPH. THIS STORM CAN PRODUCE QUARTER SIZE HAIL. * THE SEVERE THUNDERSTORM WILL BE NEAR... ST. OLAF AROUND 1035 PM... VOLGA AROUND 1045 PM... ELKADER AND THOMASVILLE AROUND 1050 PM... CLAYTON CENTER AROUND 1055 PM... OSBORNE AND SAINT SEBALD AROUND 1100 PM... HIGHWAY 13 AND COUNTY C 24 AROUND 1105 PM... COMMUNIA AND MEDERVILLE AROUND 1110 PM... PRECAUTIONARY/PREPAREDNESS ACTIONS... IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR LARGE HAIL. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS. && LAT...LON 4294 9167 4300 9149 4284 9119 4269 9160 TIME...MOT...LOC 0331Z 321DEG 12KT 4289 9150 WIND...HAIL <50MPH 1.00IN $$ JW
237 WWUS53 KARX 050335 SVSARX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE LA CROSSE WI 1035 PM CDT TUE SEP 4 2012 IAC043-065-050415- /O.CON.KARX.SV.W.0112.000000T0000Z-120905T0415Z/ FAYETTE IA-CLAYTON IA- 1035 PM CDT TUE SEP 4 2012 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR CLAYTON AND EAST CENTRAL FAYETTE COUNTIES UNTIL 1115 PM CDT... AT 1030 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM LOCATED NEAR HIGHWAY 56 AND COUNTY W 70...OR NEAR ELKADER...MOVING SOUTHEAST AT 15 MPH. THIS STORM CAN PRODUCE PING PONG BALL SIZE HAIL. * THE SEVERE THUNDERSTORM WILL BE NEAR... VOLGA AROUND 1045 PM... ELKADER AND THOMASVILLE AROUND 1050 PM... CLAYTON CENTER AROUND 1055 PM... OSBORNE AND SAINT SEBALD AROUND 1100 PM... HIGHWAY 13 AND COUNTY C 24 AROUND 1105 PM... MEDERVILLE AND MOTOR AROUND 1110 PM... COMMUNIA AROUND 1115 PM... PRECAUTIONARY/PREPAREDNESS ACTIONS... IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR LARGE HAIL. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS. && LAT...LON 4294 9167 4300 9149 4284 9119 4269 9160 TIME...MOT...LOC 0335Z 321DEG 12KT 4288 9149 WIND...HAIL <50MPH 1.50IN $$ JW
979 WWUS53 KARX 050346 SVSARX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE LA CROSSE WI 1046 PM CDT TUE SEP 4 2012 IAC043-065-050415- /O.CON.KARX.SV.W.0112.000000T0000Z-120905T0415Z/ FAYETTE IA-CLAYTON IA- 1046 PM CDT TUE SEP 4 2012 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR CLAYTON AND EXTREME EAST CENTRAL FAYETTE COUNTIES UNTIL 1115 PM CDT... AT 1043 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM LOCATED NEAR ELKADER...MOVING SOUTHEAST AT 15 MPH. THIS STORM CAN PRODUCE PING PONG BALL SIZE HAIL. IN ADDITION THIS STORM IS CAPABLE OF PRODUCING LARGE QUANTITIES OF HAIL THAT MAY COVER ROADWAYS. * THE SEVERE THUNDERSTORM WILL BE NEAR... ELKADER AND THOMASVILLE AROUND 1055 PM... OSBORNE AND CLAYTON CENTER AROUND 1100 PM... HIGHWAY 13 AND COUNTY C 24 AROUND 1105 PM... MEDERVILLE AND MOTOR AROUND 1110 PM... COMMUNIA AROUND 1115 PM... PRECAUTIONARY/PREPAREDNESS ACTIONS... IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR LARGE HAIL. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS. TORRENTIAL RAINFALL FROM THIS STORM MAY ALSO CAUSE THE PONDING OF WATER ON ROADWAYS AND LOCALIZED FLOODING. && LAT...LON 4294 9164 4298 9148 4284 9119 4269 9160 TIME...MOT...LOC 0345Z 321DEG 12KT 4285 9146 WIND...HAIL <50MPH 1.50IN $$ JW
165 WWUS53 KARX 050400 SVSARX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE LA CROSSE WI 1100 PM CDT TUE SEP 4 2012 IAC065-050410- /O.CAN.KARX.SV.W.0112.000000T0000Z-120905T0415Z/ FAYETTE IA- 1100 PM CDT TUE SEP 4 2012 ...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL FAYETTE COUNTY IS CANCELLED... THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED AREA. LAT...LON 4293 9161 4293 9144 4284 9119 4269 9160 TIME...MOT...LOC 0400Z 321DEG 12KT 4281 9142 $$ IAC043-050415- /O.CON.KARX.SV.W.0112.000000T0000Z-120905T0415Z/ CLAYTON IA- 1100 PM CDT TUE SEP 4 2012 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHERN CLAYTON COUNTY UNTIL 1115 PM CDT... AT 1055 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM LOCATED NEAR OSBORNE...OR NEAR ELKADER...MOVING SOUTHEAST AT 15 MPH. THIS STORM CAN PRODUCE PING PONG BALL SIZE HAIL. * THE SEVERE THUNDERSTORM WILL BE NEAR... MEDERVILLE AND MOTOR AROUND 1110 PM... COMMUNIA AROUND 1115 PM... PRECAUTIONARY/PREPAREDNESS ACTIONS... IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR LARGE HAIL. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS. TORRENTIAL RAINFALL FROM THESE STORMS MAY ALSO CAUSE THE PONDING OF WATER ON ROADWAYS AND LOCALIZED FLOODING. && LAT...LON 4293 9161 4293 9144 4284 9119 4269 9160 TIME...MOT...LOC 0400Z 321DEG 12KT 4281 9142 WIND...HAIL <50MPH 1.50IN $$ JW
The office that day
Everything else NWS La Crosse, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 4, 7:06 PM CDT | Severe Thunderstorm Warning | ARX | Allamakee | 24 min |
| Sep 4, 7:35 PM CDT | Severe Thunderstorm Warning | ARX | Clayton | 70 min |
| Sep 4, 8:09 PM CDT | Flash Flood Warning | ARX | Allamakee, Clayton | 6 hr |
| Sep 4, 10:42 PM CDT | Severe Thunderstorm Warning | ARX | Allamakee, Winneshiek | 33 min |
| Sep 4, 11:09 PM CDT | Flash Flood Warning | ARX | Allamakee, Winneshiek | 5 hr |
| Sep 4, 11:14 PM CDT | Severe Thunderstorm Warning | ARX | Clayton | 46 min |
| Sep 4, 11:36 PM CDT | Severe Thunderstorm Warning | ARX | Allamakee, Clayton, Fayette, Winneshiek | 47 min |
| Sep 4, 11:59 PM CDT | Severe Thunderstorm Warning | ARX | Clayton | 61 min |
| Sep 5, 12:12 AM CDT | Severe Thunderstorm Warning | ARX | Floyd, Mitchell | 63 min |
| Sep 5, 12:31 AM CDT | Severe Thunderstorm Warning | ARX | Chickasaw, Howard | 44 min |
| Sep 5, 1:06 AM CDT | Severe Thunderstorm Warning | ARX | Fayette, Winneshiek | 24 min |
| Sep 5, 1:28 AM CDT | Severe Thunderstorm Warning | ARX | Allamakee | 32 min |
| Sep 5, 1:51 AM CDT | Flash Flood Warning | ARX | Clayton, Fayette | 3 hr |
| Sep 5, 1:59 AM CDT | Flash Flood Warning | ARX | Allamakee, Clayton | 3 hr |
Nearby
Severe Thunderstorm Warnings in Iowa, 2012Every severe thunderstorm warning in 2012
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.