Alert archive / Iowa / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 26, NWS La Crosse, WI
NWS La Crosse, WI issued this severe thunderstorm warning at May 5, 2012, 3:31 PM CDT for Floyd County, Mitchell County, Iowa. It was in force for 59 min. 7 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
- May 5, 2012, 3:31 PM CDT (20:31 UTC)
- Expired
- May 5, 2012, 4:30 PM CDT
- In force
- 59 min
- Issued by
- NWS La Crosse, WI
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Floyd County, IA, Mitchell County, IA
The radar
The La Crosse radar (KARX), 145 km from the middle of the area, began a volume at 20:32 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 |
|---|---|---|---|
| May 5, 3:57 PM CDT | HAIL 0.75 | Nora Springs, IA | |
| May 5, 4:00 PM CDT | HAIL 1 | 2 W Rudd, IA | |
| May 5, 4:13 PM CDT | HAIL 1 | Floyd, IA | |
| May 5, 4:22 PM CDT | HAIL 0.75 | 2 S Floyd, IA | |
| May 5, 4:24 PM CDT | HAIL 1.75 | 1 W Charles City, IA | NEAR FAIR GROUNDS |
| May 5, 4:29 PM CDT | HAIL 0.88 | Charles City, IA | RELAYED BY KCHA |
| May 5, 4:30 PM CDT | HAIL 0.75 | Charles City, IA |
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 |
|---|---|---|---|
| May 5, 11:38 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Minneapolis, MN (KMPX), launched 12:00Z, 8.5 hours before the alert went out and 183 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
- 480 m above ground
- 0-6 km bulk shear
- 57 kt
- 0-1 km storm-relative helicity
- 174 m²/s²
- 0-3 km storm-relative helicity
- 217 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.4
The text
As transmitted, in the capitals the NWS used until 2016.
317
WUUS53 KARX 052031
SVRARX
IAC067-131-052130-
/O.NEW.KARX.SV.W.0026.120505T2031Z-120505T2130Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LA CROSSE WI
331 PM CDT SAT MAY 5 2012
THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
FLOYD COUNTY IN NORTH CENTRAL IOWA...
MITCHELL COUNTY IN NORTH CENTRAL IOWA...
* UNTIL 430 PM CDT
* AT 328 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
SEVERE THUNDERSTORMS ROUGHLY ALONG A LINE EXTENDING FROM LYLE TO 10
MILES NORTH OF NORA SPRINGS TO 15 MILES WEST OF NORA SPRINGS...
MOVING EAST AT 30 MPH. THESE STORMS CAN PRODUCE QUARTER SIZE HAIL
AND DAMAGING WINDS IN EXCESS OF 60 MPH.
* THE SEVERE THUNDERSTORMS WILL BE NEAR...
STACYVILLE AROUND 345 PM...
OSAGE AROUND 350 PM...
NORA SPRINGS AROUND 355 PM...
ROCKFORD AROUND 405 PM...
FLOYD AROUND 420 PM...
CHARLES CITY AROUND 430 PM...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
IF YOU ARE IN THE PATH OF THESE STORMS...PREPARE IMMEDIATELY FOR
LARGE HAIL AND DAMAGING WINDS. SEEK SHELTER NOW INSIDE A STURDY
STRUCTURE AND STAY AWAY FROM WINDOWS.
&&
LAT...LON 4350 9303 4350 9256 4296 9256 4303 9303
TIME...MOT...LOC 2031Z 280DEG 27KT 4348 9292 4328 9304
4317 9328
WIND...HAIL 60MPH 1.00IN
$$
DTJ3 follow-up statements
788
WWUS53 KARX 052047
SVSARX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
347 PM CDT SAT MAY 5 2012
IAC067-131-052130-
/O.CON.KARX.SV.W.0026.000000T0000Z-120505T2130Z/
MITCHELL IA-FLOYD IA-
347 PM CDT SAT MAY 5 2012
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR FLOYD AND
MITCHELL COUNTIES UNTIL 430 PM CDT...
AT 342 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THUNDERSTORMS WERE ROUGHLY ALONG A LINE EXTENDING FROM STACYVILLE TO
OSAGE TO NORA SPRINGS...MOVING EAST AT 30 MPH. THESE STORMS CAN
PRODUCE QUARTER SIZE HAIL AND DAMAGING WINDS IN EXCESS OF 60 MPH.
* THE SEVERE THUNDERSTORMS WILL BE NEAR...
NORA SPRINGS AROUND 355 PM...
ROCKFORD AND RUDD AROUND 405 PM...
FLOYD AROUND 415 PM...
CHARLES CITY AROUND 425 PM...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
IF YOU ARE IN THE PATH OF THESE STORMS...PREPARE IMMEDIATELY FOR
LARGE HAIL AND DAMAGING WINDS. SEEK SHELTER NOW INSIDE A STURDY
STRUCTURE AND STAY AWAY FROM WINDOWS.
TORRENTIAL RAINFALL FROM THESE STORMS MAY ALSO CAUSE THE PONDING OF
WATER ON ROADWAYS AND LOCALIZED FLOODING.
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT. CONDITIONS REMAIN
FAVORABLE FOR ADDITIONAL SEVERE THUNDERSTORMS TO DEVELOP.
&&
LAT...LON 4350 9303 4350 9256 4296 9256 4303 9303
TIME...MOT...LOC 2047Z 280DEG 27KT 4345 9274 4325 9286
4314 9310
WIND...HAIL 60MPH 1.00IN
$$
DTJ245
WWUS53 KARX 052101
SVSARX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
401 PM CDT SAT MAY 5 2012
IAC067-131-052130-
/O.CON.KARX.SV.W.0026.000000T0000Z-120505T2130Z/
MITCHELL IA-FLOYD IA-
401 PM CDT SAT MAY 5 2012
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR FLOYD AND
MITCHELL COUNTIES UNTIL 430 PM CDT...
FIRE DEPARTMENT RESCUE SQUAD REPORTED DIME SIZE HAIL IN NORA SPRINGS.
AT 356 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THUNDERSTORMS WERE ROUGHLY ALONG A LINE EXTENDING FROM RICEVILLE TO
OSAGE TO NORA SPRINGS...MOVING EAST AT 30 MPH. THESE STORMS CAN
PRODUCE QUARTER SIZE HAIL AND DAMAGING WINDS IN EXCESS OF 60 MPH.
* THE SEVERE THUNDERSTORMS WILL BE NEAR...
RUDD AROUND 405 PM...
FLOYD AROUND 415 PM...
CHARLES CITY AROUND 430 PM...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
IF YOU ARE IN THE PATH OF THESE STORMS...PREPARE IMMEDIATELY FOR
LARGE HAIL AND DAMAGING WINDS. 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.
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT. CONDITIONS REMAIN
FAVORABLE FOR ADDITIONAL SEVERE THUNDERSTORMS TO DEVELOP.
&&
LAT...LON 4330 9303 4337 9293 4349 9280 4350 9256
4296 9256 4303 9303
TIME...MOT...LOC 2100Z 280DEG 27KT 4343 9261 4323 9273
4312 9297
WIND...HAIL 60MPH 1.00IN
$$
DTJ526
WWUS53 KARX 052113
SVSARX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
413 PM CDT SAT MAY 5 2012
IAC067-131-052130-
/O.CON.KARX.SV.W.0026.000000T0000Z-120505T2130Z/
MITCHELL IA-FLOYD IA-
413 PM CDT SAT MAY 5 2012
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR FLOYD AND
EASTERN MITCHELL COUNTIES UNTIL 430 PM CDT...
LOCAL LAW ENFORCEMENT OFFICIALS REPORTED QUARTER SIZE HAIL TWO MILES
WEST OF RUDD.
AT 410 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THUNDERSTORMS WERE ROUGHLY ALONG A LINE EXTENDING FROM RICEVILLE TO
FLOYD TO MARBLE ROCK...MOVING EAST AT 30 MPH. THESE STORMS CAN
PRODUCE QUARTER SIZE HAIL AND DAMAGING WINDS IN EXCESS OF 60 MPH.
* THE SEVERE THUNDERSTORMS WILL BE NEAR...
CHARLES CITY AROUND 425 PM...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
IF YOU ARE IN THE PATH OF THESE STORMS...PREPARE IMMEDIATELY FOR
LARGE HAIL AND DAMAGING WINDS. SEEK SHELTER NOW INSIDE A STURDY
STRUCTURE AND STAY AWAY FROM WINDOWS.
TORRENTIAL RAINFALL FROM THESE STORMS MAY ALSO CAUSE THE PONDING OF
WATER ON ROADWAYS AND LOCALIZED FLOODING.
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT. CONDITIONS REMAIN
FAVORABLE FOR ADDITIONAL SEVERE THUNDERSTORMS TO DEVELOP.
&&
LAT...LON 4323 9293 4331 9282 4341 9276 4347 9256
4296 9256 4303 9303
TIME...MOT...LOC 2112Z 280DEG 27KT 4341 9261 4320 9268
4302 9283
WIND...HAIL 60MPH 1.00IN
$$
DTJThe office that day
Everything else NWS La Crosse, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 4, 7:15 PM CDT | Severe Thunderstorm Warning | ARX | Chickasaw, Floyd, Howard | 45 min |
| May 5, 4:29 PM CDT | Severe Thunderstorm Warning | ARX | Chickasaw, Floyd | 43 min |
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.