Hail and Damaging Wind in South Dakota, August 22, 2002

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SIOUX FALLS SD
305 AM CDT THU AUG 22 2002

CONVECTION CHANCES REMAIN THE BIGGEST CONCERN THIS MORNING.  TWO
DISTINCT AREAS OF ONGOING CONVECTION AS OF 08Z.  THE FIRST IS THE
PERSISTENT BAND RIGHT ALONG THE WARM FRONT ACROSS NORTHWEST IOWA...
WITH REDEVELOPMENT OVER THE SAME AREAS OF CHEROKEE AND BUENA VISTA
COUNTIES.  WILL LIKELY BE LOOKING AT SOME PRETTY SIGNIFICANT RAIN
TOTALS FROM THIS AREA. THE SECOND AREA IS ASSOCIATED WITH SHORTWAVE
MOVING EAST ACROSS SOUTH DAKOTA.  ONE VERY PERSISTENT CELL ON THE
LEADING EDGE HAS BEEN HANGING ON FOR MANY HOURS...AND HAVE BEEN
GETTING SOME ADDITIONAL DEVELOPMENT FARTHER WEST INTO SOUTHCENTRAL
SD WITHIN THE LAST COUPLE OF HOURS.  RECEIVED A COUPLE REPORTS OF
DIME TO NICKEL SIZE HAIL WITH THE LEADING CELL AT ITS STRONGEST
POINT...BUT AGAIN MAINLY LOOKING AT HEAVY RAINS.  THIS AREA WILL
CONTINUE TO SWING EAST ACROSS THE CWA THIS MORNING...EVENTUALLY
JOINING FORCES WITH ADDITIONAL BAND ACROSS NORTHWEST IOWA.  WILL
HANG ONTO SCATTERED TSRA THROUGH MID MORNING ACROSS WESTERN 2/3RDS
OF CWA AND THROUGH THE MORNING IN THE FAR EAST.

THEN ATTENTION TURNS TO ANOTHER SHORTWAVE FORECAST BY BOTH ETA AND
AVN TO SWING THROUGH SD LATE THIS AFTERNOON AND EVENING.  NOT MUCH
FOR INSTABILITY WITH THIS...BUT WITH LINGERING MOISTURE ACROSS THE
AREA...SHORTWAVE COULD BE ENOUGH TO TRIGGER ANOTHER ROUND OF SHOWERS
AND THUNDERSTORMS LATER TODAY...AND HAVE ADDED A CHANCE THROUGHOUT
THE CWA TO COVER THIS.

ALSO PRETTY EXTENSIVE LOW CLOUDS ACROSS THE AREA EARLY THIS MORNING
WITH AREAS OF FOG IN UPSLOPE AREAS EAST OF THE BUFFALO RIDGE.  THIS
SHOULD BREAK UP SOME AS THE RAIN MOVES THROUGH...BUT WE WILL BE
LOOKING AT PLENTY OF RESIDUAL LOW LEVEL MOISTURE RESULTING IN A
DECENT AMOUNT OF STRATOCU/CU DEVELOPMENT THROUGHOUT THE DAY.  WITH
THE ABUNDANT MOISTURE AND LITTLE IN THE WAY OF LOW LEVEL WINDS...
THINK TEMPS WILL HAVE A HARD TIME SEEING MUCH RECOVERY...AND HAVE
LOWERED TEMPS A CATEGORY OR SO FOR HIGHS TODAY.

REMAINDER OF THE FORECAST LOOKS REASONABLE AND HAVE NOT CHANGED TOO
MUCH FROM PREVIOUS FORECAST.

.FSD...NONE
 HACKER

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
316 AM CDT THU AUG 22 2002

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0715 PM    5 N DALLAS                SD   60 MPH TSTM GUST
08/21/02   GREGORY                        REPORTED BY PUBLIC.
                                          TREE BRANCHES DOWN.

0720 PM    10 N GREGORY              SD   1 INCH HAIL
08/21/02   GREGORY                        MARBLE TO QUARTER SIZE
                                          HAIL COVERNING HIGHWAY
                                          44.  REPORTED BY LAW
                                          ENFORCEMENT OFFICIAL.

0103 AM    MT VERNON                 SD   .88 INCH HAIL
08/22/02   DAVISON                        REPORTED BY EMERGENCY
                                          MANAGEMENT.

0112 AM    MT VERNON                 SD   .75 INCH HAIL
08/22/02   DAVISON                        REPORTED BY STORM
                                          SPOTTER.