Alert archive / Iowa / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 45, NWS La Crosse, WI
NWS La Crosse, WI issued this severe thunderstorm warning at Jun 21, 2011, 1:05 AM CDT for Floyd County, Iowa. It was in force for 40 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
- Jun 21, 2011, 1:05 AM CDT (06:05 UTC)
- Expired
- Jun 21, 2011, 1:45 AM CDT
- In force
- 40 min
- Issued by
- NWS La Crosse, WI
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
County Floyd County, IA
The radar
The La Crosse radar (KARX), 158 km from the middle of the area, began a volume at 06:05 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 |
|---|---|---|---|
| Jun 21, 1:20 AM CDT | TSTM WND GST 60 | Charles City, IA | |
| Jun 21, 1:25 AM CDT | TSTM WND GST 50 | Charles City, IA | |
| Jun 21, 1:30 AM CDT | TSTM WND DMG | Charles City, IA | A NUMBER OF 1 TO 3 FOOT DIAMETER TREES DOWN ACROSS THE CITY. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Minneapolis, MN (KMPX), launched 00:00Z, 6.1 hours before the alert went out and 208 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
- 979 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- -2 m²/s²
- 0-3 km storm-relative helicity
- 104 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
The text
As transmitted, in the capitals the NWS used until 2016.
153
WUUS53 KARX 210605
SVRARX
IAC067-210645-
/O.NEW.KARX.SV.W.0045.110621T0605Z-110621T0645Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LA CROSSE WI
105 AM CDT TUE JUN 21 2011
THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
FLOYD COUNTY IN NORTH CENTRAL IOWA...
* UNTIL 145 AM CDT
* AT 101 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM LOCATED NEAR MARBLE ROCK...OR 15 MILES
SOUTHWEST OF CHARLES CITY...MOVING NORTHEAST AT 45 MPH. THIS STORM
CAN PRODUCE PENNY SIZE HAIL AND DAMAGING WINDS IN EXCESS OF 60 MPH.
* THE SEVERE THUNDERSTORM WILL BE NEAR...
ROCKFORD AROUND 110 AM...
OAKWOOD 115 AM...
CHARLES CITY AND RUDD AROUND 120 AM...
FLOYD AND IDLEWILDE STATE PARK AROUND 125 AM...
HOWARDVILLE AND COLWELL COUNTY PARK AROUND 130 AM...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR SMALL
HAIL AND DAMAGING WINDS. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE
AND STAY AWAY FROM WINDOWS.
&&
LAT...LON 4321 9292 4321 9256 4291 9256 4290 9302
4291 9303
TIME...MOT...LOC 0604Z 210DEG 38KT 4294 9287
WIND...HAIL 60MPH 0.75IN
$$
043 follow-up statements
403 WWUS53 KARX 210621 SVSARX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE LA CROSSE WI 121 AM CDT TUE JUN 21 2011 IAC067-210645- /O.CON.KARX.SV.W.0045.000000T0000Z-110621T0645Z/ FLOYD IA- 121 AM CDT TUE JUN 21 2011 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR FLOYD COUNTY UNTIL 145 AM CDT... AT 119 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM LOCATED NEAR FLOYD CROSSING...OR NEAR CHARLES CITY...MOVING NORTHEAST AT 45 MPH. THIS STORM CAN PRODUCE QUARTER SIZE HAIL AND DAMAGING WINDS IN EXCESS OF 60 MPH. A SECOND SEVERE THUNDERSTORM WAS JUST MOVING INTO THE SOUTHERN PART OF THE COUNTY SOUTHEAST OF MARBLE ROCK. THIS STORM IS ALSO CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... FLOYD AND IDLEWILDE STATE PARK AROUND 125 AM... HOWARDVILLE AND COLWELL COUNTY PARK AROUND 130 AM... PRECAUTIONARY/PREPAREDNESS ACTIONS... IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR LARGE HAIL AND DAMAGING WINDS. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS. && LAT...LON 4290 9297 4321 9292 4321 9256 4291 9256 TIME...MOT...LOC 0620Z 210DEG 38KT 4309 9275 WIND...HAIL 60MPH 1.00IN $$ 04
006 WWUS53 KARX 210633 SVSARX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE LA CROSSE WI 133 AM CDT TUE JUN 21 2011 IAC067-210645- /O.CON.KARX.SV.W.0045.000000T0000Z-110621T0645Z/ FLOYD IA- 133 AM CDT TUE JUN 21 2011 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EASTERN FLOYD COUNTY UNTIL 145 AM CDT... BROADCAST MEDIA REPORTED WINDS OF 60 MPH IN CHARLES CITY AT 120 AM CDT WITH A SEVERE THUNDERSTORM. AT 129 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM LOCATED NEAR HOWARDVILLE...OR 7 MILES NORTH OF CHARLES CITY...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. && LAT...LON 4302 9282 4321 9292 4321 9256 4291 9256 TIME...MOT...LOC 0632Z 210DEG 38KT 4320 9266 WIND...HAIL 60MPH 1.00IN $$ 04
498 WWUS53 KARX 210641 SVSARX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE LA CROSSE WI 141 AM CDT TUE JUN 21 2011 IAC067-210651- /O.EXP.KARX.SV.W.0045.000000T0000Z-110621T0645Z/ FLOYD IA- 141 AM CDT TUE JUN 21 2011 ...THE SEVERE THUNDERSTORM WARNING FOR EASTERN FLOYD COUNTY WILL EXPIRE AT 145 AM CDT... THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED AREA. LAT...LON 4302 9282 4321 9292 4321 9256 4291 9256 TIME...MOT...LOC 0641Z 210DEG 38KT 4328 9259 $$ 04
The office that day
Everything else NWS La Crosse, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 21, 1:29 AM CDT | Severe Thunderstorm Warning | ARX | Chickasaw, Howard, Mitchell | 47 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.