Severe Thunderstorm Warning 158, NWS La Crosse, WI

AREA FORECAST DISCUSSION...UPDATED.
NATIONAL WEATHER SERVICE LA CROSSE WI
347 AM CDT MON SEP 11 2000

MAIN FORECAST CHALLENGE...FRONTAL PASSAGE AND ASSOCIATED WEATHER.

DATA ANALYSIS SHOWING A STRONG SHORTWAVE DIVING INTO MONTANA THIS
MORNING.  THIS SHORTWAVE BEING RESOLVED WELL BY THE MODEL FORECASTS.
ETA HAS COME INTO MUCH BETTER AGREEMENT WITH THE AVN'S FORECAST OF
THIS FEATURE AND ITS AFFECT ON THE FORECAST AREA.  MAIN CHALLENGE
THIS FORECAST PACKAGE WILL BE FRONTAL PASSAGE AND ASSOCIATED WEATHER.

ONGOING LINE OF THUNDERSTORMS ACROSS THE NORTHERN COUNTIES PRODUCING
SIGNIFICANT RAINFALL AMOUNTS OF 2 TO 4 INCHES (RADAR ESTIMATED).
THIS ACTIVITY WILL PERSIST FOR A WHILE...BUT WILL DIMINISH AFTER
SUNRISE AS THE LOW LEVEL JET WEAKENS.

FRONT WILL RESIDE NORTH AND WEST OF THE FORECAST AREA TODAY. WITH
LITTLE INITIAL CLOUDINESS AND TEMPERATURES IN THE 70S...EXPECT
VERY WARM AFTERNOON HIGHS. GOING ABOVE MOS.

BY AFTERNOON...ATMOSPHERE WILL BECOME VERY UNSTABLE.  DEEP LAYER
SHEAR INCREASES UNDER THE INFLUENCE OF INCOMING VIGOROUS SHORTWAVE.
CONDITIONS QUITE FAVORABLE FOR SEVERE WEATHER...WITH ISOLATED
TORNADIC SUPERCELLS POSSIBLE ALONG AND AHEAD OF THE FRONT INITIALLY.
STORMS SHOULD EVOLVE INTO A SQUALL LINE AS FORCING BECOMES MORE
LINEAR.  GIVEN THE INCREASED POTENTIAL OF SEVERE WEATHER...WILL
INTRODUCE SEVERE WORDING INTO THE FORECAST.

FRONT MOVES THROUGH THIS EVENING AND TONIGHT.  WILL SLOW THE TIMING
OF THE FRONTAL PASSAGE A BIT.  AS A RESULT...WILL INCREASE
PRECIPITATION CHANCES ALL ZONES THIS EVENING AND OVERNIGHT LOWS.
COOLER AIR WILL FOLLOW TUESDAY.

***BASED ON THE CONSIDERABLE AMOUNT OF RAINFALL WHICH HAS OCCURRED
OVER CLARK AND TAYLOR COUNTIES...AND GIVEN THE THUNDERSTORM
POSSIBILITIES TODAY AND THIS EVENING...WILL ISSUE A FLASH FLOOD
WATCH FOR THAT SPECIFIC AREA.

.LSE...FLASH FLOOD WATCH FOR TODAY THROUGH THIS EVENING...WIZ017-029.

KRC

IAZ008>010-018-019-MNZ088-094>096-WIZ041>044-053-110630-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
115 AM CDT MON SEP 11 2000

THE SEVERE THUNDERSTORM WATCH HAS BEEN CANCELLED FOR PORTIONS OF
NORTHEAST IOWA...SOUTHEAST MINNESOTA AND CENTRAL AND SOUTHWEST
WISCONSIN. THE WARM FRONT HAS PUSHED FURTHER NORTH DURING THE LATE
EVENING HOURS...WHICH HAS REDUCED THE SEVERE WEATHER THREAT IN PARTS
OF NORTHEAST IOWA...SOUTHEAST MINNESOTA...AND CENTRAL AND SOUTHWEST
WISCONSIN.

THE WATCH HAS BEEN CANCELLED IN THE FOLLOWING COUNTIES:

IN NORTHEAST IOWA...

CHICKASAW     FLOYD      HOWARD      MITCHELL    WINNESHIEK

IN SOUTHEAST MINNESOTA...

HOUSTON    ,   FILLMORE   MOWER      WINONA

IN CENTRAL AND SOUTHWEST WISCONSIN...

ADAMS         JUNEAU     LA CROSSE   MONROE      VERNON

NELSON

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LA CROSSE WI
131 AM CDT MON SEP 11 2000

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ...COUNTY LOCATION....
F
0120 AM    GREENWOOD                 WI   WIND DAMAGE
09/11/00   CLARK                          REPORTED BY DISPATCH
                                          TREES DOWN

NELSON

MNZ079-086-087-WIZ029-032>034-110730-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
205 AM CDT MON SEP 11 2000

THE SEVERE THUNDERSTORM WATCH HAS BEEN ALLOWED TO EXPIRE FOR PORTIONS
OF SOUTHEAST MINNESOTA...AND CENTRAL AND SOUTHWEST WISCONSIN. THE
THREAT OF WIDESPREAD SEVERE WEATHER HAS LESSENED ACROSS THE
REGION...THEREFORE THE WATCH HAS BEEN ALLOWED TO EXPIRE.

STRONG THUNDERSTORMS CONTINUE THROUGH CENTRAL WISCONSIN...AND SOME
ISOLATED SEVERE STORMS WILL STILL BE POSSIBLE OVERNIGHT.

THE WATCH HAS EXPIRED IN THE FOLLOWING COUNTIES:

IN SOUTHEAST MINNESOTA...

DODGE    OLMSTED    WABASHA

IN CENTRAL AND SOUTHWEST WISCONSIN...

BUFFALO  CLARK      JACKSON     TREMPEALEAU

NELSON