Alert archive / Iowa / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 27, NWS La Crosse, WI
NWS La Crosse, WI issued this severe thunderstorm warning at May 5, 2012, 4:29 PM CDT for Chickasaw County, Floyd County, Iowa. It was in force for 43 min. 3 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, 4:29 PM CDT (21:29 UTC)
- Expired
- May 5, 2012, 5:12 PM CDT
- In force
- 43 min
- Issued by
- NWS La Crosse, WI
- Area
- Storm-based polygon
- Hail
- 1.75 in
- Wind
- 60.0 mph
Counties Chickasaw County, IA, Floyd County, IA
The radar
The La Crosse radar (KARX), 143 km from the middle of the area, began a volume at 21:28 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, 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 | |
| May 5, 4:50 PM CDT | HAIL 0.25 | 2 Sw Nashua, IA | ISU AG FARM-ALSO 0.82 RAIN VERY SHORT PERIOD OF TIME |
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, 9.5 hours before the alert went out and 216 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.
435
WUUS53 KARX 052129
SVRARX
IAC037-067-052230-
/O.NEW.KARX.SV.W.0027.120505T2129Z-120505T2230Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LA CROSSE WI
429 PM CDT SAT MAY 5 2012
THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
EASTERN FLOYD COUNTY IN NORTH CENTRAL IOWA...
WESTERN CHICKASAW COUNTY IN NORTHEAST IOWA...
* UNTIL 530 PM CDT
* AT 424 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM LOCATED NEAR CHARLES CITY...MOVING SOUTHEAST AT
25 MPH. THIS STORM CAN PRODUCE LARGE DAMAGING HAIL UP TO GOLF BALL
SIZE AND DAMAGING WINDS IN EXCESS OF 60 MPH. TRAINED SPOTTERS
REPORTED GOLF BALL SIZE HAIL NEAR THE FLOYD COUNTY FAIRGROUNDS IN
CHARLES CITY. THIS WARNING EXTENDS THE PREVIOUS SEVERE
THUNDERSTORM WARNING FOR FLOYD AND CHICKASAW COUNTIES.
* THE SEVERE THUNDERSTORM WILL BE NEAR...
MIDWAY AND CARRVILLE AROUND 435 PM...
HOWARDS WOOD RECREATIONAL AREA AND BASSETT AROUND 440 PM...
NASHUA AND BRADFORD AROUND 445 PM...
IONIA AND HIGHWAY 18 AND COUNTY V 18 AROUND 450 PM...
NEW HAMPTON AND WILLIAMSTOWN AROUND 505 PM...
BOYD AROUND 510 PM...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
THIS IS A DANGEROUS SITUATION. IF YOU ARE IN THE PATH OF THIS
STORM...PREPARE IMMEDIATELY FOR DESTRUCTIVE HAIL...WHICH CAN
SIGNIFICANTLY DAMAGE ROOFS...WINDOWS...SIDING AND VEHICLES. DAMAGING
WINDS ARE ALSO EXPECTED...WHICH WILL UPROOT TREES AND DOWN POWER
LINES. 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 4319 9270 4317 9223 4290 9224 4290 9282
4291 9293
TIME...MOT...LOC 2127Z 295DEG 22KT 4303 9267
WIND...HAIL 60MPH 1.75IN
$$
DTJ3 follow-up statements
901 WWUS53 KARX 052146 SVSARX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE LA CROSSE WI 446 PM CDT SAT MAY 5 2012 IAC037-067-052230- /O.CON.KARX.SV.W.0027.000000T0000Z-120505T2230Z/ FLOYD IA-CHICKASAW IA- 446 PM CDT SAT MAY 5 2012 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR WESTERN CHICKASAW AND SOUTHEASTERN FLOYD COUNTIES UNTIL 530 PM CDT... BROAD CAST MEDIA REPORTED NICKLE SIZE HAIL IN CHARLES CITY AT 429 PM AND BROADCAST MEDIA REPORTED PENNY SIZE HAIL IN CHARLES CITY AT 430 PM. AT 442 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM LOCATED NEAR BRADFORD...OR 10 MILES SOUTHEAST OF CHARLES CITY...MOVING EAST AT 40 MPH. THIS STORM CAN PRODUCE LARGE DAMAGING HAIL UP TO GOLF BALL SIZE AND DAMAGING WINDS IN EXCESS OF 60 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... TWIN PONDS PARK AND NEW HAMPTON AIRPORT AROUND 450 PM... NEW HAMPTON AND REPUBLIC AROUND 455 PM... PRECAUTIONARY/PREPAREDNESS ACTIONS... THIS IS A DANGEROUS SITUATION. IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR DESTRUCTIVE HAIL...WHICH CAN SIGNIFICANTLY DAMAGE ROOFS...WINDOWS...SIDING AND VEHICLES. DAMAGING WINDS ARE ALSO EXPECTED...WHICH WILL UPROOT TREES AND DOWN POWER LINES. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS. TORRENTIAL RAINFALL FROM THESE STORMS MAY ALSO CAUSE THE PONDING OF WATER ON ROADWAYS AND LOCALIZED FLOODING. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT. CONDITIONS REMAIN FAVORABLE FOR ADDITIONAL SEVERE THUNDERSTORMS TO DEVELOP. && LAT...LON 4317 9255 4312 9232 4290 9224 4291 9272 TIME...MOT...LOC 2145Z 289DEG 34KT 4297 9249 WIND...HAIL 60MPH 1.75IN $$ DTJ
738 WWUS53 KARX 052157 SVSARX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE LA CROSSE WI 457 PM CDT SAT MAY 5 2012 IAC037-067-052230- /O.CON.KARX.SV.W.0027.000000T0000Z-120505T2230Z/ FLOYD IA-CHICKASAW IA- 457 PM CDT SAT MAY 5 2012 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHWESTERN CHICKASAW AND SOUTHEASTERN FLOYD COUNTIES UNTIL 530 PM CDT... AT 452 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM LOCATED NEAR NASHUA...OR 13 MILES SOUTHWEST OF NEW HAMPTON...MOVING SOUTHEAST AT 25 MPH. THIS STORM CAN PRODUCE QUARTER SIZE HAIL AND DAMAGING WINDS IN EXCESS OF 60 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... WILLIAMSTOWN AROUND 505 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. 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 4305 9252 4310 9232 4290 9224 4291 9262 TIME...MOT...LOC 2157Z 303DEG 24KT 4291 9246 WIND...HAIL 60MPH 1.00IN $$ DTJ
193 WWUS53 KARX 052212 SVSARX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE LA CROSSE WI 512 PM CDT SAT MAY 5 2012 IAC037-067-052222- /O.CAN.KARX.SV.W.0027.000000T0000Z-120505T2230Z/ FLOYD IA-CHICKASAW IA- 512 PM CDT SAT MAY 5 2012 ...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN CHICKASAW AND SOUTHEASTERN FLOYD COUNTIES IS CANCELLED... THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED AREA. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT. CONDITIONS REMAIN FAVORABLE FOR ADDITIONAL SEVERE THUNDERSTORMS TO DEVELOP. LAT...LON 4305 9252 4310 9232 4290 9224 4291 9262 TIME...MOT...LOC 2212Z 303DEG 24KT 4285 9235 $$ DTJ
The 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, 3:31 PM CDT | Severe Thunderstorm Warning | ARX | Floyd, Mitchell | 59 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.