Severe Thunderstorm Warning 113, NWS Aberdeen, SD

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE ABERDEEN SD
255 PM CDT MON AUG 3 2009

.SHORT TERM...TONIGHT THROUGH WEDNESDAY NIGHT
FORECAST CHALLENGES...PRECIPITATION CHANCES THIS EVENING...AND
AGAIN TUESDAY NIGHT THROUGH WEDNESDAY NIGHT...ALONG WITH TEMPS.

CURRENTLY...A SOUTH-MOVING COLD FRONT IS JUST ABOUT TO ENTER THE
NORTHERN CWA. A LINE OF CUMULUS CLOUDS CAN BE SEEN DEVELOPING
ALONG THIS FRONT. CONVECTIVE INHIBITION CONTINUES TO WANE THIS
AFTERNOON...DOWN TO AROUND -20 TO -80 J/KG. AGAIN...LIFT/FORCING
AND DEEP LAYER SHEAR ARE ALL THERE THIS AFTERNOON/EVENING TO GET
STORMS TO DEVELOP. AND LIKE YESTERDAY...LOW LEVEL MOISTURE IS THE
LARGEST LIMITING FACTOR TO SEEING WIDESPREAD STRONG TO SEVERE
STORMS. ALSO...LOW AND MID LEVEL LAPSE RATES ARE NOT AS STEEP
TODAY AS THEY WERE YESTERDAY. A FEW STORMS MAY FORM ALONG THIS
FRONTAL BOUNDARY AS IT SINKS SOUTHWARD TOWARD NEBRASKA THIS
EVENING. STRONG GUSTY WINDS WOULD BE THE PRIMARY THREAT WITH
STORMS THIS AFTERNOON/EVENING.

WELL...WITHOUT A LOW LEVEL JET AROUND TONIGHT...EXPECTING A QUIET
WEATHER NIGHT TONIGHT...ONCE ANY AFTERNOON/EVENING CONVECTION DIES
OFF. OVERNIGHT LOWS WILL ONCE AGAIN DROP WELL BELOW NORMAL FOR
MOST ALL OF THE CWA WITH COOL DRY CANADIAN SURFACE HIGH PRESSURE
SETTING UP SHOP OVER THE REGION...WHICH PERSISTS INTO THE DAY ON
TUESDAY.

THE MODELS HAVE ALL HUNG ON TO THIS IDEA OF AN AREA OF LOW LEVEL
MOISTURE AT 850HPA ADVECTING BACK INTO THE WESTERN/SOUTHWESTERN CWA
TUESDAY NIGHT AFTER 00Z. THE MODELS ARE ALSO PROGGING A 15 TO 25
KNOT LOW LEVEL JET TO DEVELOP TUESDAY NIGHT ACROSS THE FAR WESTERN
ZONES. WHILE THE WESTERN FORECAST ZONES ARE UNDERGOING LOW LEVEL
MOISTURE ADVECTION...WAA IS OCCURRING ABOVE IT AT 700HPA.
EXPECTING ACCUS-THUNDER TO DEVELOP OVERNIGHT TUESDAY NIGHT AND
PERSIST RIGHT INTO WEDNESDAY AS THE MOISTURE ADVECTION AND WAA
PATTERN CONTINUES. BY WEDNESDAY EVENING...SOME OF THE HIGHEST
AMOUNTS OF INSTABILITY /CAPE PROGGED OVER 2500 J PER KG IN BOTH
THE NAM AND GFS 12Z SOLUTION/ SEEN IN AWHILE WILL BE OVER THE
SOUTHERN HALF OF FORECAST ZONES AT THE SAME TIME AN UPPER WAVE IS
WORKING OVER THE CWA. THE UPPER WAVE MAY BE INDUCING A SURFACE LOW
AND ATTENDANT WARM FRONT EASTWARD ACROSS THE CWA ON WEDNESDAY.
SO...BETWEEN THE LIFT/FORCING/AVAILABLE LOW LEVEL MOISTURE AND
PROGGED 0-6KM SHEAR...WEDNESDAY AFTERNOON AND EVENING COULD JUST
BE A STRONG CANDIDATE FOR SEVERE WEATHER ACTIVITY.

TEMPERATURES ARE NOT GOING TO BE ALL THAT HOT OVER THE NEXT COUPLE
OF DAYS. ASIDE FROM THE SURFACE LOW AND POSSIBLE DEVELOPING WARM
FRONT POSSIBLY BISECTING THE CWA ON WEDNESDAY...MOST ALL OF THE
CWA WILL BE UNDER THE INFLUENCE OF HIGH PRESSURE AT THE SURFACE
WITH MAINLY WEAK CAA TO NEUTRAL AIR ADVECTION OCCURRING.
TEMPERATURES WILL REMAIN GENERALLY 5 TO 10 DEGREES BELOW NORMAL
THROUGH THE SHORT RANGE.

.LONG TERM...THURSDAY THROUGH MONDAY
THE 12Z MODELS CONTINUE TO ADVERTISE A DE-AMPLIFICATION OF THE LONG
WAVE FLOW PATTERN ACROSS THE CONUS. A STRONG TROF IS EXPECTED TO
LIFT OUT OF THE WESTERN CONUS...AND ACROSS THE NORTHERN
ROCKIES/NORTHERN PLAINS THIS WEEKEND. AHEAD OF THIS FEATURE THERE
WILL BE PERIODIC CONVECTIVE COMPLEXES FORMING OVER THE HIGH PLAINS
IN BROAD UPSLOPE FLOW. THOSE COMPLEXES WILL THEN TRACK EAST ON THE
NOSE OF THE NOCTURNAL LLJ. BY LATE FRIDAY AND SATURDAY THE
ATMOSPHERE BECOMES A LITTLE LESS FAVORABLE FOR STORMS AS A VERY
WARM CAPPING LAYER GETS ADVECTED EAST OFF THE FRONT RANGE. HOWEVER
WITH A LOW LEVEL CONVERGENT BOUNDARY EXPECTED TO TRACK ACROSS THE
REGION...CAN NOT ENTIRELY RULE OUT PCPN CHANCES. PRETTY MUCH
FOLLOWED HPC GUIDANCE FOR TEMPERATURES...AND SPEAKING OF
TEMPERATURES...THEY SHOULD BE QUITE WARM THIS WEEKEND.

&&

.AVIATION...
OTHER THAN SOME ISOLATED EVENING SHOWERS AND STORMS...VFR
CONDITIONS ARE EXPECTED TO PREVAIL THROUGH TUESDAY.

&&

.ABR WATCHES/WARNINGS/ADVISORIES...
SD...NONE.
MN...NONE.
&&

SHORT TERM...DORN
LONG TERM...TDK
AVIATION...TDK

WEATHER.GOV/ABERDEEN

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE ABERDEEN SD
447 AM CDT MON AUG 3 2009

MNZ039-046-SDZ003>011-015>023-033>037-045-048-051-041000-
TRAVERSE-BIG STONE-CORSON-CAMPBELL-MCPHERSON-BROWN-MARSHALL-
ROBERTS-WALWORTH-EDMUNDS-DAY-DEWEY-POTTER-FAULK-SPINK-CLARK-
CODINGTON-GRANT-HAMLIN-DEUEL-STANLEY-SULLY-HUGHES-HYDE-HAND-JONES-
LYMAN-BUFFALO-
447 AM CDT MON AUG 3 2009 /347 AM MDT MON AUG 3 2009/

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF WEST CENTRAL
MINNESOTA...CENTRAL SOUTH DAKOTA...NORTH CENTRAL SOUTH DAKOTA AND
NORTHEAST SOUTH DAKOTA.

.DAY ONE...TODAY AND TONIGHT

A SLIGHT CHANCE FOR THUNDERSTORMS EXISTS THIS AFTERNOON AND
EVENING AS ANOTHER COLD FRONT DROPS SOUTH THROUGH THE AREA. ANY
THUNDERSTORMS THAT DO DEVELOP ARE CAPABLE OF GUSTY WINDS AND SMALL
HAIL.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

OFF AND ON CHANCES FOR THUNDERSTORMS EXIST BEGINNING TUESDAY NIGHT
AND LASTING THROUGH THE WEEKEND AS THE WEATHER PATTERN BECOMES A
BIT MORE ACTIVE.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT ANTICIPATED TODAY OR TONIGHT.

TMT

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ABERDEEN SD
620 PM CDT MON AUG 3 2009

SDZ006-032345-
BROWN-
620 PM CDT MON AUG 3 2009

...A SIGNIFICANT WEATHER ADVISORY HAS BEEN ISSUED FOR SOUTHERN BROWN
COUNTY UNTIL 645 PM CDT...

AT 619 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 6 MILES SOUTHWEST OF COLUMBIA...OR 7 MILES
NORTHEAST OF ABERDEEN...MOVING EAST AT 30 MPH.

A FEW LOCATIONS IN THE ADVISORY INCLUDE COLUMBIA...BATH...PUTNEY...
GROTON AND FERNEY.

PENNY TO NICKEL SIZE HAIL...AND WINDS AROUND 40 TO 50 MPH ARE
EXPECTED WITH THIS STORM.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

&&

KEEFE

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
633 PM CDT MON AUG 03 2009

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0628 PM     HAIL             4 S COLUMBIA            45.56N 98.31W
08/03/2009  E1.50 INCH       BROWN              SD   PUBLIC

            HAIL QUARTER TO PING PONG BALL SIZE.

&&

SKEEFE

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