Severe Thunderstorm Warning 99, NWS La Crosse, WI

336 
WWUS53 KARX 201931
SVSARX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
231 PM CDT FRI AUG 20 2010

MNC055-169-WIC063-202000-
/O.CON.KARX.SV.W.0099.000000T0000Z-100820T2000Z/
WINONA MN-HOUSTON MN-LA CROSSE WI-
231 PM CDT FRI AUG 20 2010

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR LA CROSSE...
NORTHEASTERN HOUSTON AND SOUTHEASTERN WINONA COUNTIES UNTIL 300 PM
CDT...

SPOTTERS NEAR HOKAH MINNESOTA HAVE REPORTED VERY GUSTY WINDS AND 
LIMITED VISIBILITY WITH HEAVY RAIN AS THESE STORMS PASSED THROUGH A 
FEW MINUTES AGO.

THE SEVERE THUNDERSTORMS WERE JUST ABOUT TO CROSS THE MISSISSIPPI 
RIVER NEAR LA CROSSE AND COULD PRODUCE WIND GUSTS UP TO 60 MPH.
BOATERS SHOULD USE CAUTION ALONG THE RIVER AND MOVE TO SHORE.

* THE SEVERE THUNDERSTORMS WILL BE NEAR...
  ONALASKA AND BRICE PRAIRIE AROUND 235 PM...
  HOLMEN AROUND 240 PM...
  WEST SALEM AROUND 245 PM...
  BANGOR AROUND 250 PM...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THESE STORMS...PREPARE IMMEDIATELY FOR
DAMAGING WINDS. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY
AWAY FROM WINDOWS.

SEVERE THUNDERSTORMS POSE A SIGNIFICANT DANGER TO BOATERS. IF ON AREA
RIVERS OR LAKES...IMMEDIATELY MOVE TO SHORE AND FIND SHELTER.

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 FRIDAY
EVENING FOR WESTERN WISCONSIN.

&&

LAT...LON 4372 9126 4362 9145 4384 9160 4395 9137
      4398 9138 4399 9133 4404 9135 4406 9131
      4406 9122 4409 9119 4407 9112 4407 9092
      4373 9091
TIME...MOT...LOC 1930Z 240DEG 33KT 4397 9139 4372 9117
WIND...HAIL 60MPH <.50IN

$$

SHEA

398 
WWUS53 KARX 201940
SVSARX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
240 PM CDT FRI AUG 20 2010

MNC055-169-WIC063-202000-
/O.CON.KARX.SV.W.0099.000000T0000Z-100820T2000Z/
WINONA MN-HOUSTON MN-LA CROSSE WI-
240 PM CDT FRI AUG 20 2010

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR LA CROSSE...
NORTHEASTERN HOUSTON AND SOUTHEASTERN WINONA COUNTIES UNTIL 300 PM
CDT...

TRAINED WEATHER SPOTTERS IN DOWNTOWN LA CROSSE REPORTED WIND GUSTS 
OF 40 MPH AS THESE STORMS MOVE THROUGH. THESE STORMS WERE QUICKLY
PUSHING THROUGH THE LA CROSSE AREA...AND COULD PRODUCE SOME LOCALLY
HIGHER GUSTS THAT COULD KNOCK DOWN TREES AND POWER LINES.

* THE SEVERE THUNDERSTORMS WILL BE NEAR...
  WEST SALEM AROUND 245 PM...
  BANGOR AROUND 250 PM...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THESE STORMS...PREPARE IMMEDIATELY FOR
DAMAGING WINDS. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY
AWAY FROM WINDOWS.

SEVERE THUNDERSTORMS POSE A SIGNIFICANT DANGER TO BOATERS. IF ON AREA
RIVERS OR LAKES...IMMEDIATELY MOVE TO SHORE AND FIND SHELTER.

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 FRIDAY
EVENING FOR WESTERN WISCONSIN.

&&

LAT...LON 4373 9091 4372 9126 4373 9137 4384 9160
      4395 9137 4398 9138 4399 9133 4404 9135
      4406 9131 4406 9122 4409 9119 4407 9112
      4407 9092
TIME...MOT...LOC 1939Z 240DEG 33KT 4401 9129 4376 9107
WIND...HAIL 60MPH <.50IN

$$

SHEA

788 
WWUS53 KARX 201946
SVSARX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
246 PM CDT FRI AUG 20 2010

MNC055-169-201954-
/O.CAN.KARX.SV.W.0099.000000T0000Z-100820T2000Z/
WINONA MN-HOUSTON MN-
246 PM CDT FRI AUG 20 2010

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN HOUSTON AND
SOUTHEASTERN WINONA COUNTIES IS CANCELLED...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAS SHIFTED INTO 
WISCONSIN...SO THE WARNING IS BEING CANCELLED.

LAT...LON 4373 9091 4372 9126 4377 9125 4381 9126
      4390 9133 4398 9138 4399 9133 4404 9135
      4406 9131 4406 9122 4409 9119 4407 9112
      4407 9092
TIME...MOT...LOC 1944Z 240DEG 33KT 4403 9123 4379 9107

$$

WIC063-202000-
/O.CON.KARX.SV.W.0099.000000T0000Z-100820T2000Z/
LA CROSSE WI-
246 PM CDT FRI AUG 20 2010

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR LA CROSSE
COUNTY UNTIL 300 PM CDT...

THERE HAVE BEEN REPORTS OF TREES DOWN NEAR HOKAH MINNESOTA AND
A NATIONAL WEATHER SERVICE STAFF MEMBER IN LA CRESCENT HAD A WIND
GUST OF 50 MPH. WIND GUSTS AT THE LA CROSSE AIRPORT WERE ABOUT 45 MPH
AND TORRENTIAL RAINS WERE OCCURRING AT THE NATIONAL WEATHER SERVICE 
OFFICE ON LA CROSSE RIDGE.

THIS WIND GUST AND HEAVY RAIN WILL CONTINUE TO SHIFT THROUGH LA 
CROSSE COUNTY THOUGH...INCLUDING WEST SALEM...BANGOR AND MINDORO.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THESE STORMS...PREPARE IMMEDIATELY FOR
DAMAGING WINDS. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY
AWAY FROM WINDOWS.

SEVERE THUNDERSTORMS POSE A SIGNIFICANT DANGER TO BOATERS. IF ON AREA
RIVERS OR LAKES...IMMEDIATELY MOVE TO SHORE AND FIND SHELTER.

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 FRIDAY
EVENING FOR WESTERN WISCONSIN.

&&

LAT...LON 4373 9091 4372 9126 4377 9125 4381 9126
      4390 9133 4398 9138 4399 9133 4404 9135
      4406 9131 4406 9122 4409 9119 4407 9112
      4407 9092
TIME...MOT...LOC 1944Z 240DEG 33KT 4403 9123 4379 9107
WIND...HAIL 60MPH <.50IN

$$

SHEA

470 
WWUS53 KARX 201954
SVSARX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
254 PM CDT FRI AUG 20 2010

WIC063-202000-
/O.CON.KARX.SV.W.0099.000000T0000Z-100820T2000Z/
LA CROSSE WI-
254 PM CDT FRI AUG 20 2010

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR LA CROSSE
COUNTY UNTIL 300 PM CDT...

A WIND GUST OF 48 MPH WAS RECORDED AT THE LA CROSSE AIRPORT AND 
TELEVISION MEDIA IN DOWNTOWN LA CROSSE REPORTED WIND GUSTS OF 50 TO 
55 MPH. HEAVY RAIN AND FREQUENT LIGHTNING HAVE BEEN HITTING THE
LA CROSSE NATIONAL WEATHER.

THESE STORMS CONTINUE TO MOVE EAST WITH GUSTY WINDS AND DEADLY 
LIGHTNING ALONG WITH HEAVY RAIN.

A NEW SEVERE THUNDERSTORM FOR AREAS TO THE EAST IS LIKELY IN THE 
NEXT FEW MINUTES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THESE STORMS...PREPARE IMMEDIATELY FOR
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 FRIDAY
EVENING FOR WESTERN WISCONSIN.

&&

LAT...LON 4373 9091 4372 9126 4377 9125 4381 9126
      4390 9133 4398 9138 4399 9133 4404 9135
      4406 9131 4406 9122 4409 9119 4407 9112
      4407 9092
TIME...MOT...LOC 1951Z 240DEG 33KT 4406 9115 4382 9099
WIND...HAIL 60MPH <.50IN

$$

SHEA

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LA CROSSE WI
128 PM CDT FRI AUG 20 2010

.UPDATE...
MONITORING CONVECTIVE TRENDS ACROSS THE REGION FOR THIS AFTERNOON
AND SOME POSSIBLE SEVERE WEATHER. A WARM FRONT HAS TRACKED
NORTHWARD INTO NORTHERN WISCONSIN THIS MORNING AND APPEARS TO
STRETCH FROM THE TWIN CITIES EAST TO NORTH OF MEDFORD. SURFACE
BASED INSTABILITY HAS INCREASED ACROSS MUCH OF WISCONSIN BASED ON
THE 20.17Z WHICH SHOWS ABOUT 3000 TO 4000 J/KG OF CAPE ACROSS THE
SOUTHERN HALF OF WISCONSIN. 0-6KM SHEAR REMAINS THE BEST ACROSS
NORTHEAST WISCONSIN WITH 0-3KM SHEAR OF ABOUT 30KTS ACROSS
SOUTHERN WISCONSIN. THE THREAT FOR ANY TORNADOES APPEARS MINIMAL
GIVEN THAT THE WARM FRONT IS NORTH OF TAYLOR COUNTY NOW. THE MAIN
THREATS WILL BE WITH LARGE HAIL GIVEN THE HIGH INSTABILITY...BUT
STRONG STRAIGHT LINE WINDS CAN NOT BE RULED OUT GIVEN THE DECENT
0-3KM SHEAR. THE BEST CHANCES FOR THESE STORMS APPEARS TO BE THIS
AFTERNOON BEFORE SUNSET.

&&

.PREV DISCUSSION... /ISSUED 327 AM CDT FRI AUG 20 2010/

SHORT TERM...THROUGH SUNDAY

MAIN FORECAST CONCERN IS WITH THE RAIN CHANCES TODAY INTO TONIGHT.

SURFACE ANALYSIS EARLY THIS MORNING SHOWS AN AREA OF LOW PRESSURE
OVER CENTRAL SOUTH DAKOTA. A WARM FRONT EXTENDED EAST OF THE LOW
ACROSS MINNESOTA INTO NORTHERN WISCONSIN WITH A TROUGH OF LOW
PRESSURE SOUTH ACROSS NEBRASKA INTO KANSAS. LOCAL AND REGIONAL
RADARS SHOW A COMPLEX OF SHOWERS AND THUNDERSTORMS ALONG THE WARM
FRONT FROM MINNESOTA INTO WISCONSIN.

THE LARGEST CONCENTRATION OF SHOWERS AND STORMS ALONG THE WARM
FRONT WAS MOVING INTO NORTHEAST MINNESOTA AND NORTHWEST WISCONSIN
AND HAS YET TO TAKE MUCH OF A TURN TO THE EAST. CORFIDI VECTORS
OVER EASTERN MINNESOTA ARE STILL SOUTHWEST BUT DO TURN TO THE WEST
AHEAD OF THE COMPLEX OF STORMS. THIS IMPLIES THERE STILL MAY BE A
TURN TO THE EAST AS INDICATED BY ALMOST ALL OF THE SHORT RANGE
MESO SCALE MODELS. THIS WILL HAVE TO HAPPEN SOON FOR THIS TO CLIP
THE NORTHERN SECTIONS OF THE FORECAST AREA...OTHERWISE THE RAIN
CHANCES ACROSS THIS AREA FOR THE EARLY MORNING HOURS WILL HAVE TO
BE ADJUSTED DOWN. ONCE THIS COMPLEX OF STORMS MOVES BY...THERE
SHOULD BE A LULL IN THE ACTION THROUGH THE LATE MORNING AND EARLY
AFTERNOON BEFORE MORE ACTIVITY FORMS. THE SHORT WAVE TROUGHS
CURRENTLY OVER NORTH DAKOTA...WYOMING AND COLORADO ARE ALL
EXPECTED TO BE OVER THE UPPER MIDWEST DURING THE AFTERNOON. THE
NORTH DAKOTA WAVE IS ANTICIPATED TO WORK ON THE WARM FRONT AND
CAUSE ADDITIONAL STORMS TO FIRE ACROSS NORTHERN WISCONSIN INTO THE
U.P OF MICHIGAN. MEANWHILE...THE WYOMING AND COLORADO WAVES SHOULD
WORK EAST INTO IOWA AND MISSOURI WITH THE 20.00Z NAM SHOWING THE
WAVE COMING INTO IOWA PRODUCING AROUND 4 PVU/S OF VORTICITY
ADVECTION IN THE 500 TO 300 MB LAYER BETWEEN 20.21Z AND 21.00Z.
THIS WAVE SHOULD ALSO HELP PUSH THE SURFACE LOW INTO CENTRAL
MINNESOTA WITH THE TROUGH OF LOW PRESSURE SOUTH ACROSS IOWA. THE
LOW LEVEL FORCING WITH THIS LOW AND TROUGH DO NOT LOOK OVERLY
IMPRESSIVE WITH ONLY SOME WEAK BUT DISORGANIZED FRONTOGENESIS IN
THE 1000-850 MB LAYER. THE BEST WARM AIR ADVECTION SHOULD OCCUR
NORTH OF THE AREA ALONG AND NORTH OF THE WARM FRONT AND TO THE
SOUTH WITH THE SOUTHERN WAVE OVER MISSOURI. THIS LEAVES A WEAK
AREA OF WARM AIR ADVECTION OVER THE AREA THIS AFTERNOON PRODUCING
UP TO 3 UBAR/S OF UP GLIDE ON THE 310K ISENTROPIC SURFACE.
CONFIDENCE ON HOW MUCH DEVELOPMENT WILL OCCUR BETWEEN THE TWO
STRONGER SHORT WAVE TROUGHS AND OVER THE AREA IS NOT HIGH GIVEN
THE WEAK OVERALL FORCING SIGNALS. NONE THE LESS...THE SHORT RANGE
MESO SCALE MODELS INCLUDING THE 20.00Z SPC WRF AND EAST ARW ALONG
WITH THE NAM AND 20.00Z ECMWF SHOW SOME DEVELOPMENT OCCURRING
ALONG THE TROUGH DURING THE LATE AFTERNOON. PLACEMENT OF THIS
DEVELOPMENT IS PRIMARILY ALONG AND EAST OF THE MISSISSIPPI RIVER
AND HAVE TRIED TO CAPTURE THIS WITH THE HIGHEST RAIN CHANCES LATE
THIS AFTERNOON OVER WISCONSIN.

IF THIS ACTIVITY DOES INDEED DEVELOP THERE SHOULD BE SOME SEVERE
WEATHER THREAT WITH IT. THE NAM DOES SUGGEST THE POTENTIAL FOR
BETWEEN 1500 AND 2000 J/KG OF ML CAPE BUT THE SHEAR MAY NOT BE ALL
THE GREAT. AT MOST 25 TO 30 KNOTS OF 0-3 KM SHEAR WILL BE PRESENT
IF THE LOW LEVEL CAP BREAKS ALLOWING FOR SURFACE BASED CONVECTION
TO FORM ALLOWING FOR AN ISOLATED DAMAGING WIND GUST THREAT. ALL THE
MODELS SHOW SOME MID LEVEL COOLING OCCURRING ABOVE THE CAP TO HELP
ERODE IT FROM ABOVE BUT WITH THE LOW LEVEL WARM AIR ADVECTION
CONTINUING...NOT SURE THIS WILL BE ENOUGH TO TOTALLY BREAK THE
CAP. FORECAST SOUNDINGS FROM THE MODELS SHOW THE CAP BREAKING LATE
THIS AFTERNOON BUT THAT COULD BE IN RESPONSE TO THE CONVECTIVE
SCHEMES KICKING IN AND DEVELOPING THE CONVECTION AS THE CAP BREAKS
IN THE BUFKIT SOUNDINGS AT THE SAME TIME IT STARTS RAINING. IF THE
CAP DOES NOT BREAK...WOULD EXPECT ANY STORMS THAT DO DEVELOP TO
REMAIN ELEVATED WITH A VERY MINIMAL SEVERE THREAT.

ANY ACTIVITY THAT DOES DEVELOP THIS AFTERNOON WILL PUSH EAST OF
THE AREA DURING THE EVENING. SOME FOG POTENTIAL FOR TONIGHT IF THE
SKIES CAN CLEAR SOON ENOUGH WITH THE POSSIBILITY OF PLENTY OF
MOISTURE FROM ANY RAIN AVAILABLE TO HELP WITH THE FOG PRODUCTION.
A BETTER FOG NIGHT FOR THE RIVER VALLEYS MAY BE SETTING UP FOR
SATURDAY NIGHT INTO SUNDAY MORNING. HIGH PRESSURE SHOULD BE OVER
THE AREA FOR CLEAR SKIES AND LIGHT WINDS. DEW POINTS ARE NOT
EXPECTED TO DECREASE THAT MUCH WHICH MAY END UP KEEPING AIR
TEMPERATURES NEAR THE WATER TEMPERATURES OVER THE SMALLER RIVERS
WHICH MAY LIMIT THE VALLEY FOG TO THE WISCONSIN AND MISSISSIPPI
RIVER VALLEYS.

LONG TERM...SUNDAY NIGHT THROUGH THURSDAY

BOTH THE 20.00Z GFS AND ECMWF INDICATE A POSITIVELY TILTED UPPER
TROUGH AND SURFACE COLD FRONT WILL CROSS THE UPPER MIDWEST MONDAY
NIGHT THROUGH TUESDAY. WITH THE POSITIVE TILT TO THE SYSTEM...IT
SHOULD BE WEAKENING AS IT COME THROUGH AND THERE MAY NOT BE A LOT
OF RAIN LEFT WITH IT BY THE TIME IT GETS TO THE LOCAL AREA. THE
CURRENT 20 TO 30 PERCENT RAIN CHANCES SEEM APPROPRIATE ALTHOUGH
THERE MAY NEED TO BE A RAIN CHANCE INCLUDED FOR TUESDAY AFTERNOON
WITH THE ECMWF SUGGESTING THE SYSTEM MAY NOT HAVE CLEARED THE
REGION YET.

AVIATION...

TWO POTENTIAL ROUNDS OF SHOWERS AND THUNDERSTORMS MAY IMPACT THE TAF
SITES AS A LOW PRESSURE SYSTEM MOVES THROUGH...BUT NEITHER ROUND IS
CERTAIN. THE FIRST ROUND WOULD OCCUR THIS MORNING...WITH SHOWERS AND
STORMS MOVING EAST OUT OF SOUTHWEST MINNESOTA. HOWEVER..THEY MAY END
UP TRACKING NORTH OF THE TAF SITES...AND AS SUCH HAVE MAINTAINED
VCSH WITH NO CB MENTION FROM 09-15Z. THE TRACK OF THE PRECIPITATION
WILL NEED TO BE MONITORED THIS MORNING FOR POSSIBLE TAF AMENDMENTS.
LATER THIS AFTERNOON AND INTO THIS EVENING...A WEAK COLD FRONT
ASSOCIATED WITH THE SYSTEM IS FORECAST TO CROSS THE TAF SITES.
SHOWERS AND THUNDERSTORMS MAY FIRE ALONG THE FRONT...DEPENDING ON
HOW HEATING CAN OCCUR THROUGH A CIRROSTRATUS DECK THAT SHOULD BE IN
PLACE MUCH OF THE DAY. AT THIS POINT...ONLY HAVE ENOUGH CONFIDENCE
TO INCLUDE A CB MENTION FOR 21-03Z...BUT IT IS CONCEIVABLE FOR BOTH
SITES TO END UP DRY. ON THE OTHER HAND...SHOULD STORMS FORM...THERE
IS THE POTENTIAL FOR THEM TO PRODUCE STRONG WIND GUSTS AND POSSIBLY
HAIL AS WELL. THEREFORE...THE AFTERNOON FORECAST ALSO NEEDS TO BE
MONITORED.

THERE ARE SOME BR/FOG CONCERNS AS WELL. THE FIRST COMES THIS
MORNING...WITH MVFR BR EXPECTED UNTIL DAYTIME HEATING CAN MIX IT OUT
AROUND 15Z. DEPENDING ON THE AMOUNT OF CLEARING TONIGHT AND IF RAIN
OCCURS...COULD SEE IFR OR LOWER VSBY FOG DEVELOP LATE TONIGHT...DUE
TO LOW LEVEL MOISTURE NOT BEING SCOURED OUT VERY WELL BY THE COLD
FRONT. WILL BE LOOKING AT THIS MORE FOR THE 12Z TAF ISSUANCE.

&&

.ARX WATCHES/WARNINGS/ADVISORIES...
WI...NONE.
MN...NONE.
IA...NONE.
&&

UPDATE...HALBACH
SHORT/LONG TERM...04
AVIATION...AJ/WETENKAMP

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE LA CROSSE WI
502 AM CDT FRI AUG 20 2010

IAZ008>011-018-019-029-030-MNZ079-086>088-094>096-WIZ017-029-032>034-
041>044-053>055-061-211000-
ADAMS-ALLAMAKEE-BUFFALO-CHICKASAW-CLARK-CLAYTON-CRAWFORD-DODGE-
FAYETTE-FILLMORE-FLOYD-GRANT-HOUSTON-HOWARD-JACKSON-JUNEAU-LA CROSSE-
MITCHELL-MONROE-MOWER-OLMSTED-RICHLAND-TAYLOR-TREMPEALEAU-VERNON-
WABASHA-WINNESHIEK-WINONA-
502 AM CDT FRI AUG 20 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PARTS OF SOUTHEAST
MINNESOTA...NORTHEAST IOWA...AND SOUTHWEST INTO CENTRAL WISCONSIN.

.DAY ONE...TODAY AND TONIGHT

A LOW PRESSURE SYSTEM AND ACCOMPANYING COLD FRONT WILL MOVE EAST
ACROSS THE AREA TODAY INTO THIS EVENING. THUNDERSTORMS WILL FIRE
ALONG THE FRONT...WITH INSTABILITY AND WIND PROFILES FAVORING STORM
ORGANIZATION. STRONG TO SEVERE THUNDERSTORMS WILL BE POSSIBLE...WITH
DAMAGING WINDS AND LARGE HAIL THE MAIN THREATS. THE COLD FRONT WILL
MOVE EAST OF THE AREA OVERNIGHT...SHIFTING THE THREAT FOR SEVERE
THUNDERSTORMS OUT OF THE AREA.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

THUNDERSTORMS ARE ALSO POSSIBLE LATE MONDAY NIGHT AND TUESDAY.
IT IS TOO EARLY TO DETERMINE IF THERE WOULD BE A SEVERE WEATHER
THREAT WITH THIS THUNDERSTORM POTENTIAL.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED BETWEEN 3 PM AND 9 PM.

.EMERGENCY MANAGEMENT COORDINATION...

NO CALL IS SCHEDULED.

WETENKAMP

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
1248 PM CDT FRI AUG 20 2010

MNZ079-086-087-201845-
DODGE-OLMSTED-WABASHA-
1248 PM CDT FRI AUG 20 2010

...STRONG THUNDERSTORMS EXPECTED...

AT 1246 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM NEAR BYRON...MOVING NORTHEAST AT 40 MPH.

PEA SIZE HAIL...WINDS UP TO 50 MPH...OCCASIONAL CLOUD TO GROUND
LIGHTNING...BRIEF HEAVY DOWNPOURS...ARE POSSIBLE WITH THIS STORM.

* THE THUNDERSTORM WILL BE NEAR...
  ORONOCO BY 1255 PM CDT...
  MAZEPPA BY 105 PM CDT...
  LAKE CITY BY 130 PM CDT...

GUSTY WINDS MAY CAUSE SMALL BRANCHES TO BE BLOWN DOWN...AND LOOSE
OBJECTS TO BLOW AROUND. STAY AWAY FROM HIGH OBJECTS OUTDOORS SUCH AS
TREES. SEEK SHELTER IN A STURDY STRUCTURE UNTIL THIS STORM HAS
PASSED.

HALBACH

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
105 PM CDT FRI AUG 20 2010

IAZ009>011-019-029-030-MNZ079-087-088-094>096-WIZ032>034-041-053-
201830-
ALLAMAKEE-BUFFALO-CHICKASAW-CLAYTON-FAYETTE-FILLMORE-HOUSTON-HOWARD-
JACKSON-LA
CROSSE-MOWER-OLMSTED-TREMPEALEAU-VERNON-WABASHA-WINNESHIEK-WINONA-
105 PM CDT FRI AUG 20 2010

...STRONG THUNDERSTORMS BUILDING AND MOVING TOWARDS THE MISSISSIPPI
RIVER...

SCATTERED THUNDERSTORMS WERE MOVING ACROSS PARTS OF SOUTHEAST
MINNESOTA AND NORTHEAST IOWA EARLY THIS AFTERNOON. SOME OF THE
STRONGER STORMS WILL PRODUCE LOCALLY HEAVY RAIN...GUSTY WINDS AND A
THREAT FOR LIGHTNING.

MOVE INDOORS WHEN THESE STORMS PASS THROUGH. A QUICK QUARTER INCH OF
RAIN IS POSSIBLE BUT FLOODING IS NOT EXPECTED WITH ANY OF THESE
STORMS.
SEEK SHELTER IN A STURDY STRUCTURE UNTIL THESE STORMS HAVE PASSED.

SHEA

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
131 PM CDT FRI AUG 20 2010

IAZ010-011-029-MNZ079-088-095-096-WIZ032>034-041-053-054-201930-
ALLAMAKEE-BUFFALO-CRAWFORD-FAYETTE-FILLMORE-HOUSTON-JACKSON-
LA CROSSE-TREMPEALEAU-VERNON-WABASHA-WINNESHIEK-WINONA-
131 PM CDT FRI AUG 20 2010

...STRONG THUNDERSTORMS EXPECTED THROUGH MID-AFTERNOON...

AT 125 PM...RADAR SHOWED SCATTERED THUNDERSTORMS OVER PARTS OF
SOUTHEAST MINNESOTA AND NORTHEAST IOWA...EAST OF ROCHESTER MINNESOTA
AND CHARLES CITY IOWA. THESE STORMS CONTINUED TO MOVE NORTHEAST AND
WILL PRODUCE LOCALLY HEAVY RAIN...GUSTY WINDS AND A LIGHTNING RISK.

THEY WILL BEGIN CROSSING INTO WESTERN WISCONSIN BY 2 PM AND BECOME
MORE NUMEROUS PERHAPS.

MOVE INDOORS AS THESE STORMS PASS OR TO A PLACE OF SHELTER.

SHEA