Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 32, NWS La Crosse, WI

May 20, 2012Taylor County, Wisconsin

NWS La Crosse, WI issued this severe thunderstorm warning at May 20, 2012, 1:35 PM CDT for Taylor County, Wisconsin. It was in force for 14 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
May 20, 2012, 1:35 PM CDT (18:35 UTC)
Expired
May 20, 2012, 1:49 PM CDT
In force
14 min
Issued by
NWS La Crosse, WI
Area
Storm-based polygon
Hail
1.0 in
Wind
50.0 mph

County Taylor County, WI

The radar

The La Crosse radar (KARX), 168 km from the middle of the area, began a volume at 18:34 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

TimeReportWhereRemark
May 20, 1:39 PM CDTHAIL 13 E Jump River, WIA LOT OF PENNY TO NICKEL HAIL SIZE HAIL STONES...ALONG WITH A FEW QUARTER 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.

IssuedProductOfficeLasted
May 20, 12:24 PM CDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 6.6 hours before the alert went out and 228 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.

Skew-T log-pSkew-T log-p diagram, Green Bay/Straub, WI at 12:00Z on 2012-05-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 752 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Green Bay/Straub, WI at 12:00Z on 2012-05-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 51 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
752 J/kg
Mixed-layer CIN
-121 J/kg
Mixed-layer LCL
1614 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
51 m²/s²
0-3 km storm-relative helicity
31 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

305 
WUUS53 KARX 201835
SVRARX
WIC119-201900-
/O.NEW.KARX.SV.W.0032.120520T1835Z-120520T1900Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LA CROSSE WI
135 PM CDT SUN MAY 20 2012

THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN TAYLOR COUNTY IN NORTH CENTRAL WISCONSIN...

* UNTIL 200 PM CDT

* AT 130 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM LOCATED NEAR JUMP RIVER...OR 19 MILES SOUTHEAST
  OF LADYSMITH...MOVING NORTHEAST AT 35 MPH. THIS STORM CAN 
  PRODUCE QUARTER SIZE HAIL. SPOTTERS 3 MILES NORTH OF HANNIBAL    
  REPORTED QUARTER SIZE HAIL WITH THIS STORM AT 122 PM CDT.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  COUNTY ROADS D AND N AROUND 145 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 4523 9074 4530 9089 4538 9083 4538 9054
TIME...MOT...LOC 1834Z 222DEG 32KT 4534 9074
WIND...HAIL <50MPH 1.00IN

$$

BOYNE
2 follow-up statements
278 
WWUS53 KARX 201840
SVSARX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
140 PM CDT SUN MAY 20 2012

WIC119-201900-
/O.CON.KARX.SV.W.0032.000000T0000Z-120520T1900Z/
TAYLOR WI-
140 PM CDT SUN MAY 20 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHWESTERN
TAYLOR COUNTY UNTIL 200 PM CDT...

AT 139 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM LOCATED NEAR JUMP RIVER...OR 20 MILES EAST OF
LADYSMITH...MOVING NORTHEAST AT 35 MPH. THIS STORM CAN PRODUCE
QUARTER SIZE HAIL.

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 4523 9074 4530 9089 4538 9083 4538 9054
TIME...MOT...LOC 1841Z 222DEG 32KT 4538 9068
WIND...HAIL <50MPH 1.00IN

$$

BOYNE
772 
WWUS53 KARX 201849
SVSARX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
149 PM CDT SUN MAY 20 2012

WIC119-201859-
/O.CAN.KARX.SV.W.0032.000000T0000Z-120520T1900Z/
TAYLOR WI-
149 PM CDT SUN MAY 20 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN TAYLOR COUNTY IS
CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED AND MOVED OUT OF 
THE WARNED AREA.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM CDT SUNDAY
EVENING FOR NORTHWESTERN WISCONSIN.

LAT...LON 4523 9074 4530 9089 4538 9083 4538 9054
TIME...MOT...LOC 1849Z 222DEG 32KT 4544 9061

$$

BOYNE

The office that day

Everything else NWS La Crosse, WI issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 20, 12:21 PM CDTSevere Thunderstorm WarningARXTaylor24 min
May 20, 12:26 PM CDTSevere Thunderstorm WarningARXClark, Taylor57 min
May 20, 1:52 PM CDTSevere Thunderstorm WarningARXTaylor23 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 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.