Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 21, NWS La Crosse, WI

May 14, 2007Grant County, Wisconsin; Clayton County, Iowa

NWS La Crosse, WI issued this severe thunderstorm warning at May 14, 2007, 10:50 PM CDT for Grant County, Wisconsin; Clayton County, Iowa. It was in force for 25 min. 2 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 14, 2007, 10:50 PM CDT (03:50 UTC)
Expired: May 14, 2007, 11:15 PM CDT
In force: 25 min
Issued by: NWS La Crosse, WI
Area: Counties, with a storm outline in the text

Counties Clayton County, IA, Grant County, WI

The radar

The La Crosse radar (KARX), 114 km from the middle of the area, began a volume at 03:53 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 14, 10:50 PM CDT	TSTM WND GST 65	Elkport, IA	DOWNED TREE LIMBS
May 14, 11:00 PM CDT	TSTM WND GST 67	Osterdock, IA

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 3.8 hours before the alert went out and 143 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 841 J/kg
Mixed-layer CIN: -96 J/kg
Mixed-layer LCL: 2338 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 28 m²/s²
0-3 km storm-relative helicity: 136 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.

000 
WUUS53 KARX 150350
SVRARX
IAC043-WIC043-150415-
/O.NEW.KARX.SV.W.0021.070515T0350Z-070515T0415Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LA CROSSE WI
1050 PM CDT MON MAY 14 2007

THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL CLAYTON COUNTY IN NORTHEAST IOWA...
  WEST CENTRAL GRANT COUNTY IN SOUTHWEST WISCONSIN...

* UNTIL 1115 PM CDT

* AT 1044 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR
  LITTLEPORT...OR ABOUT 8 MILES SOUTH OF ELKADER...AND MOVING EAST AT
  50 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  GARNAVILLO AND MOTOR AROUND 1050 PM...
  GUTTENBERG AND COUNTY ROADS X 47 AND C 7 X AROUND 1055 PM...
  LOCK AND DAM 10 AND JELLYSTONE PARK NEAR BAGLEY AROUND 1100 PM...

FOR YOUR PROTECTION...MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF
YOUR HOME OR BUSINESS AND STAY AWAY FROM WINDOWS.

LAT...LON 4280 9140 4270 9136 4271 9099 4274 9106
      4281 9108 4287 9109 4294 9114

$$

BOYNE

4 follow-up statements

000 
WWUS53 KARX 150358
SVSARX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
1058 PM CDT MON MAY 14 2007

IAC043-WIC043-150415-
/O.CON.KARX.SV.W.0021.000000T0000Z-070515T0415Z/
CLAYTON IA-GRANT WI-
1054 PM CDT MON MAY 14 2007

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1115 PM CDT
FOR WEST CENTRAL GRANT AND CENTRAL CLAYTON COUNTIES...

AT 1035 PM...THE PUBLIC REPORTED PENNY SIZE AND 60 MPH WIND GUSTS IN 
STRAWBERRY POINT.

AT 1050 PM...65 MPH WIND GUSTS WERE REPORTED IN ELKPORT.

AT 1053 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED
NEAR ELKPORT...OR 9 MILES SOUTHEAST OF ELKADER...MOVING EAST AT 
50 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  GUTTENBERG AND LOCK AND DAM 10 AROUND 1100 PM...
  NELSON DEWEY STATE PARK AROUND 1105 PM...

LAT...LON 4280 9140 4270 9136 4271 9099 4274 9106
      4281 9108 4287 9109 4294 9114

$$

BOYNE

000 
WWUS53 KARX 150402
SVSARX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
1101 PM CDT MON MAY 14 2007

IAC043-WIC043-150415-
/O.CON.KARX.SV.W.0021.000000T0000Z-070515T0415Z/
CLAYTON IA-GRANT WI-
1101 PM CDT MON MAY 14 2007

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1115 PM CDT
FOR WEST CENTRAL GRANT AND CENTRAL CLAYTON COUNTIES...

AT 1035 PM...THE PUBLIC REPORTED PENNY SIZE AND 60 MPH WIND GUSTS IN 
STRAWBERRY POINT.

AT 1050 PM...65 MPH WIND GUSTS WERE REPORTED IN ELKPORT.

AT 1100 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED
NEAR COUNTY ROADS X 47 AND C 7 X...OR NEAR GUTTENBERG...MOVING EAST
AT 50 MPH.

LAT...LON 4280 9140 4270 9136 4271 9099 4274 9106
      4281 9108 4287 9109 4294 9114

$$

BOYNE

000 
WWUS53 KARX 150407
SVSARX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
1106 PM CDT MON MAY 14 2007

IAC043-WIC043-150415-
/O.CON.KARX.SV.W.0021.000000T0000Z-070515T0415Z/
CLAYTON IA-GRANT WI-
1106 PM CDT MON MAY 14 2007

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1115 PM CDT
FOR WEST CENTRAL GRANT AND CENTRAL CLAYTON COUNTIES...

AT 1100 PM...THE PUBLIC MEASURED A 67 MPH WIND GUST IN OSTERDOCK IN
CLAYTON COUNTY.

AT 1101 PM CDT...A SEVERE THUNDERSTORM WAS REPORTED CAPABLE OF
PRODUCING PENNY SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.
THIS STORM WAS LOCATED NEAR GUTTENBERG...MOVING EAST AT 60 MPH.

LAT...LON 4280 9140 4270 9136 4271 9099 4274 9106
      4281 9108 4287 9109 4294 9114

$$

BOYNE

000 
WWUS53 KARX 150412
SVSARX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
1111 PM CDT MON MAY 14 2007

IAC043-WIC043-150421-
/O.EXP.KARX.SV.W.0021.000000T0000Z-070515T0415Z/
CLAYTON IA-
1111 PM CDT MON MAY 14 2007

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL CLAYTON COUNTY 
EXPIRES AT 1115 PM CDT...

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

LAT...LON 4280 9140 4270 9136 4271 9099 4274 9106
      4281 9108 4287 9109 4294 9114

$$

BOYNE

The office that day

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

Issued	Product	Office	Counties	Lasted
May 14, 7:17 PM CDT	Severe Thunderstorm Warning	ARX	Clark	28 min
May 14, 7:29 PM CDT	Severe Thunderstorm Warning	ARX	Vernon	46 min
May 14, 9:41 PM CDT	Severe Thunderstorm Warning	ARX	Crawford	49 min
May 14, 11:10 PM CDT	Severe Thunderstorm Warning	ARX	Grant	35 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2007 Severe Thunderstorm Warnings in Iowa, 2007 Every severe thunderstorm warning in 2007

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.