Alert archive / Iowa / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 70, NWS La Crosse, WI
NWS La Crosse, WI issued this severe thunderstorm warning at Jul 18, 2012, 3:22 PM CDT for Chickasaw County, Iowa. It was in force for 38 min. 1 report 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
- Jul 18, 2012, 3:22 PM CDT (20:22 UTC)
- Expired
- Jul 18, 2012, 4:00 PM CDT
- In force
- 38 min
- Issued by
- NWS La Crosse, WI
- Area
- Storm-based polygon
- Hail
- 1.75 in
- Wind
- 60.0 mph
County Chickasaw County, IA
The radar
The La Crosse radar (KARX), 118 km from the middle of the area, began a volume at 20:24 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 |
|---|---|---|---|
| Jul 18, 3:24 PM CDT | HAIL 1.5 | 3 W Fredericksburg, 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 |
|---|---|---|---|
| Jul 18, 12:58 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 8.4 hours before the alert went out and 215 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
- 1900 J/kg
- Mixed-layer CIN
- -67 J/kg
- Mixed-layer LCL
- 1674 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 35 m²/s²
- 0-3 km storm-relative helicity
- 44 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
660
WUUS53 KARX 182022
SVRARX
IAC037-182100-
/O.NEW.KARX.SV.W.0070.120718T2022Z-120718T2100Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LA CROSSE WI
322 PM CDT WED JUL 18 2012
THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
CHICKASAW COUNTY IN NORTHEAST IOWA...
* UNTIL 400 PM CDT
* AT 320 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
A SEVERE THUNDERSTORM LOCATED NEAR BOYD...OR JUST SOUTH OF NEW
HAMPTON...MOVING NORTHEAST AT 15 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...
HIGHWAY 18 AND COUNTY V 56 AROUND 335 PM...
COUNTY ROADS B 54 AND V 56 AROUND 345 PM...
LAWLER AND JACKSONVILLE AROUND 350 PM...
COUNTY ROADS V 56 AND B 33 AND LITTLE TURKEY AROUND 400 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.
&&
LAT...LON 4302 9243 4321 9214 4321 9209 4321 9208
4293 9209 4290 9231
TIME...MOT...LOC 2022Z 232DEG 12KT 4301 9225
WIND...HAIL 60MPH 1.75IN
$$
SHEA2 follow-up statements
706
WWUS53 KARX 182041
SVSARX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
341 PM CDT WED JUL 18 2012
IAC037-182100-
/O.CON.KARX.SV.W.0070.000000T0000Z-120718T2100Z/
CHICKASAW IA-
341 PM CDT WED JUL 18 2012
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR CHICKASAW
COUNTY UNTIL 400 PM CDT...
AT 338 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM LOCATED NEAR FREDERICKSBURG...MOVING NORTHEAST
AT 15 MPH. THIS STORM CAN PRODUCE LARGE DAMAGING HAIL UP TO GOLF
BALL SIZE AND DAMAGING WINDS IN EXCESS OF 60 MPH.
* THE SEVERE THUNDERSTORM WILL BE NEAR...
LAWLER AND JACKSONVILLE AROUND 350 PM...
LITTLE TURKEY AND COUNTY ROADS V 56 AND B 33 AROUND 400 PM...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
PREPARE IMMEDIATELY FOR LARGE HAIL...WHICH CAN SIGNIFICANTLY DAMAGE
ROOFS...WINDOWS...SIDING AND VEHICLES. DAMAGING WINDS ARE ALSO
EXPECTED...WHICH WILL UPROOT TREES AND DOWN POWER LINES. SEEK
SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS.
TORRENTIAL RAINFALL FROM THESE STORMS MAY ALSO CAUSE THE PONDING OF
WATER ON ROADWAYS AND LOCALIZED FLOODING.
&&
LAT...LON 4303 9231 4321 9214 4321 9208 4293 9209
4290 9231
TIME...MOT...LOC 2040Z 232DEG 12KT 4301 9213
WIND...HAIL 60MPH 1.75IN
$$
SHEA918
WWUS53 KARX 182058
SVSARX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
358 PM CDT WED JUL 18 2012
IAC037-182109-
/O.EXP.KARX.SV.W.0070.000000T0000Z-120718T2100Z/
CHICKASAW IA-
358 PM CDT WED JUL 18 2012
...THE SEVERE THUNDERSTORM WARNING FOR CHICKASAW COUNTY WILL EXPIRE
AT 400 PM CDT...
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 8 PM.
LAT...LON 4303 9231 4321 9214 4321 9208 4293 9209
4290 9231
TIME...MOT...LOC 2059Z 232DEG 12KT 4305 9206
$$
SHEAThe office that day
Everything else NWS La Crosse, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 18, 3:19 PM CDT | Severe Thunderstorm Warning | ARX | Winneshiek | 41 min |
| Jul 18, 3:57 PM CDT | Severe Thunderstorm Warning | ARX | Allamakee, Winneshiek | 39 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.