Alert archive / Minnesota / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 66, NWS La Crosse, WI

July 18, 2012Dodge County, Mower County, Minnesota

NWS La Crosse, WI issued this severe thunderstorm warning at Jul 18, 2012, 12:40 PM CDT for Dodge County, Mower County, Minnesota. It was in force for 50 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, 12:40 PM CDT (17:40 UTC)
Expired: Jul 18, 2012, 1:30 PM CDT
In force: 50 min
Issued by: NWS La Crosse, WI
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Dodge County, MN, Mower County, MN

The radar

The La Crosse radar (KARX), 127 km from the middle of the area, began a volume at 17:43 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, 12:58 PM CDT	HAIL 1.5	Hayfield, MN

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 12:00Z, 5.7 hours before the alert went out and 129 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: 2062 J/kg
Mixed-layer CIN: -144 J/kg
Mixed-layer LCL: 716 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 174 m²/s²
0-3 km storm-relative helicity: 185 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 12.6

Open this sounding in Storm Lab

The text

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

565 
WUUS53 KARX 181740
SVRARX
MNC039-099-181830-
/O.NEW.KARX.SV.W.0066.120718T1740Z-120718T1830Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LA CROSSE WI
1240 PM CDT WED JUL 18 2012

THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN DODGE COUNTY IN SOUTHEAST MINNESOTA...
  NORTHERN MOWER COUNTY IN SOUTHEAST MINNESOTA...

* UNTIL 130 PM CDT

* AT 1238 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM LOCATED NEAR GRAVES LANDING FIELD...OR 9 MILES
  SOUTH OF DODGE CENTER...MOVING SOUTHEAST AT 15 MPH. THIS STORM CAN
  PRODUCE QUARTER SIZE HAIL AND DAMAGING WINDS IN EXCESS OF 60 MPH.  

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  HAYFIELD AROUND 1250 PM...
  WALTHAM AND OSLO AROUND 105 PM...
  SARGEANT AROUND 115 PM...
  BROWNSDALE AROUND 125 PM...
  DEXTER AROUND 130 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.

&&

LAT...LON 4402 9288 4386 9267 4384 9269 4384 9264
      4376 9254 4361 9283 4389 9302
TIME...MOT...LOC 1740Z 324DEG 12KT 4390 9291
WIND...HAIL 60MPH 1.00IN

$$

SHEA

3 follow-up statements

330 
WWUS53 KARX 181748
SVSARX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
1248 PM CDT WED JUL 18 2012

MNC039-099-181830-
/O.CON.KARX.SV.W.0066.000000T0000Z-120718T1830Z/
DODGE MN-MOWER MN-
1248 PM CDT WED JUL 18 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHERN MOWER
AND SOUTHERN DODGE COUNTIES UNTIL 130 PM CDT...

AT 1243 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM LOCATED NEAR HAYFIELD...OR 10 MILES SOUTH OF
DODGE CENTER...MOVING SOUTHEAST AT 15 MPH. THIS STORM CAN PRODUCE
QUARTER SIZE HAIL AND DAMAGING WINDS IN EXCESS OF 60 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  WALTHAM BY 100 PM...
  SARGEANT AROUND 115 PM...
  BROWNSDALE AROUND 120 PM...
  DEXTER AROUND 130 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.

&&

LAT...LON 4402 9288 4386 9267 4384 9269 4384 9264
      4376 9254 4361 9283 4389 9302
TIME...MOT...LOC 1747Z 324DEG 12KT 4388 9288
WIND...HAIL 60MPH 1.00IN

$$

SHEA

922 
WWUS53 KARX 181802
SVSARX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
102 PM CDT WED JUL 18 2012

MNC039-099-181830-
/O.CON.KARX.SV.W.0066.000000T0000Z-120718T1830Z/
DODGE MN-MOWER MN-
102 PM CDT WED JUL 18 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHERN MOWER
AND SOUTHERN DODGE COUNTIES UNTIL 130 PM CDT...

EMERGENCY MANAGEMENT OFFICIALS REPORTED PING PONG BALL SIZE HAIL AT 
HATFIELD AT 1258 PM. THIS STORM WAS STILL MOVING SOUTHEAST AND COULD 
PRODUCE EVEN LARGER SIZE HAIL...TORRENTIAL RAIN AND GUSTY WINDS AS 
IT MOVES INTO RURAL NORTHERN MOWER COUNTY...NOT TOO FAR FROM 
BROWNSDALE AND DEXTER.

RADAR WAS ALSO SHOWING SIGNS OF ROTATION WITH THIS STORM FROM TIME 
TO TIME.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  WALTHAM AROUND 105 PM...
  OSLO AROUND 110 PM...
  SARGEANT AROUND 120 PM...
  BROWNSDALE AROUND 130 PM...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE STORMS CAN PRODUCE TORNADOES WITH LITTLE NOTICE.

TORRENTIAL RAINFALL FROM THESE STORMS MAY ALSO CAUSE THE PONDING OF
WATER ON ROADWAYS AND LOCALIZED FLOODING.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM.

&&

LAT...LON 4398 9283 4386 9267 4384 9269 4384 9263
      4376 9254 4361 9283 4389 9302
TIME...MOT...LOC 1801Z 324DEG 12KT 4386 9285
WIND...HAIL 60MPH 1.75IN

$$

SHEA

221 
WWUS53 KARX 181815
SVSARX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
115 PM CDT WED JUL 18 2012

MNC039-099-181830-
/O.CON.KARX.SV.W.0066.000000T0000Z-120718T1830Z/
DODGE MN-MOWER MN-
115 PM CDT WED JUL 18 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHERN 
MOWER AND FAR SOUTHERN DODGE COUNTIES UNTIL 130 PM CDT...

AT 110 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A 
SEVERE THUNDERSTORM LOCATED NEAR WALTHAM...OR 13 MILES SOUTH OF DODGE
CENTER...MOVING SOUTHEAST AT 15 MPH. THIS STORM CAN PRODUCE PING PONG
BALL SIZE HAIL AND DAMAGING WINDS IN EXCESS OF 60 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  SARGEANT AROUND 120 PM...
  BROWNSDALE AND DEXTER AROUND 130 PM...

A NEW SEVERE THUNDERSTORM WARNING MAY BE NEEDED FOR PARTS OF MOWER 
COUNTY MINNESOTA BY 130 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 UNTIL 800 PM WEDNESDAY.

&&

LAT...LON 4395 9278 4386 9267 4384 9269 4384 9263
      4376 9254 4361 9283 4387 9292
TIME...MOT...LOC 1813Z 324DEG 12KT 4384 9282
WIND...HAIL 60MPH 1.50IN

$$

SHEA

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 18, 1:29 PM CDT	Severe Thunderstorm Warning	ARX	Mower	61 min
Jul 18, 2:24 PM CDT	Severe Thunderstorm Warning	ARX	Fillmore	51 min
Jul 18, 3:19 PM CDT	Severe Thunderstorm Warning	ARX	Fillmore	41 min
Jul 18, 3:57 PM CDT	Severe Thunderstorm Warning	ARX	Houston	39 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2012 Every 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.