Hail in Kansas, October 1, 2002

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DODGE CITY KS
350 AM CDT TUE OCT 1 2002

DAYS 1-2...
THE FORECAST CHALLENGES THROUGH THIS PERIOD ARE
MULTI-FOLD, CENTERED PRIMARILY AROUND THE APPROACH OF A SIGNIFICANT
VORT MAX THAT IS CURRENTLY DIGGING SOUTH INTO NORTHERN CALIFORNIA.
THIS SHOULD ULTIMATELY YIELD BENEFICIAL RAINFALL TO MUCH OF
SOUTHWEST KANSAS THROUGH THIS PERIOD.  CURRENT ANALYSIS SHOWS STRONG
LOW OVER SOUTHEAST SASKATCHEWAN WHICH HAS DRAPED A COLD FRONT DOWN
THROUGH THE NORTHERN PLAINS, EXTENDING FROM SOUTHERN MINNESOTA
SOUTHWESTWARD THROUGH WESTERN NEBRASKA WHERE IT STALLS OUT,
EXTENDING AS A TROUGH TO THE SURFACE LOW OVER EASTERN COLORADO.  AT
08Z, LOCAL SURFACE PLOT SHOWS SOUTH WINDS EVERYWHERE IN MY CWA WITH
PRONOUNCED DRYLINE ALONG ABOUT A KEHA-SCOTT CITY LINE.

THE SOUTHERN STREAM WILL CONTINUE TO BE A BIG KEY TO THE FIRST ROUND
OF PRECIPITATION FOR THE CWA.  BOTH THE ETA AND AVN SEEM TO PICK UP
TWO DISTINCT SHORTWAVE TROUGHS WITHIN THE SOUTHERN STREAM FLOW
TOMORROW.  THE INITIAL WAVE WILL MOVE THE SURFACE LOW INTO EASTERN
NEBRASKA THROUGH MIDDAY.  THIS WILL VEER SURFACE WINDS ACROSS MUCH
OF THE AREA EARLY ON, AND WITH DIURNAL MIXING, WILL SHOVE THE
DRYLINE EAST TO ABOUT A KRSL-KPTT LINE.  AS THE AFTERNOON WEARS ON,
THE SECOND STRONGER SOUTHERN STREAM VORT MAX WILL INDUCE PRESSURE
FALLS OVER WESTERN SECTIONS OF THE THE CWA, ULTIMATELY BACKING THE
WINDS AND DRAWING THE DRYLINE BACK WESTWARD AGAIN BY LATE
AFTERNOON.  THE TIMING OF THIS DRYLINE RETREAT WILL BE CRUCIAL IN
PLACEMENT OF TSRA INITIATION.  ABUNDANT LOW LEVEL MOISTURE WILL
EXIST ALONG/AHEAD OF THE DRYLINE, AND ALONG WITH DECENT MID-UPPER
WIND PROFILES, THE SVR WX THREAT WILL CERTAINLY EXIST, ESPECIALLY
BEYOND 00 UTC 2 OCT.  HAVE KEPT THE 1ST PERIOD CHANCE POPS GOING FOR
EASTERN HALF OF CWA WITH DRYLINE PRESENT, HOWEVER, BULK OF FIRST
SIGNIFICANT PRECIP EVENT WILL COMMENCE EARLY IN THE 2ND PERIOD,
WHERE I HAVE LIKELY POPS FOR THE NORTHEASTERN 2/3 OF THE CWA.  THE
DEEPEST MOISTURE WILL BE FOUND IN THE EASTERN MOST COUNTIES AND THUS
WOULD EXPECT HIGHEST CONVECTIVE PRECIP TOTALS TO BE FOUND GENERALLY
ALONG A LARNED TO KP28 LINE.

ANY CONVECTIVE PRECIP THAT DEVELOPS ALONG THE FRONT WILL HELP
ACCELERATE THE COLD FRONT SOUTHWARD, AND SHOULD CLEAR THE ENTIRE CWA
SHORTLY AFTER 12 UTC 2 OCT.  ETA MODEL STILL INSISTS ON VERY
PRONOUNCED BAROCLINICITY WITH 850MB 2C ISOTHERM ON THE DOORSTEP OF
THE NORTHWEST COUNTIES.  DURING THE DAY WEDNESDAY, MOST LOCATIONS
SHOULD BE DRY WITH EVEN A FEW BREAKS IN THE CLOUDINESS, ESPECIALLY
NORTH.  HAVE BUMPED UP THE HIGHS TO GENERALLY UPPER 50S TO NEAR 60.
PRECIPITATION EVENT (ROUND NUMBER TWO) SHOULD COMMENCE SOMETIME
AFTER 00 UTC 3 OCT AS THE LARGE UPPER VORT COMES OUT AND ASSOCIATED
ISENTROPIC LIFT DEVELOPS OVER THE SHALLOW COLD FRONT.  ETA FORECAST
SOUNDINGS STILL SHOW ELEVATED CAPE ABOVE THE COLD FRONT, SO HAVE PUT
IN THUNDER FOR SOUTHEAST ZONES IN THE 4TH PERIOD WITH LIKELY POPS.
REST OF THE AREA SHOULD SEE A MORE STRATIFIED RAIN EVENT, CONTINUING
ON PAST THE 4TH PERIOD.

DAYS 3-7...

NO CHANGES PLANNED AS THE PREVIOUS FORECAST FOR THIS PERIOD SEEMS ON
TRACK.  POWERFUL UPPER S/WV SHOULD EJECT INTO THE PLAINS AROUND
THURSDAY AND THERE SHOULD BE COPIOUS AMOUNTS OF LIFT ACROSS THE
AREA.  QUESTION WILL BE WHERE THE SURFACE RESPONSE WILL BE BUT THIS
FAR OUT IS WHITE NOISE SO WILL NOT TRY TO TWEAK ANY OF THE
FORECAST ELEMENTS.  LATEST GFS ALSO CONTINUES TO SUGGEST ANOTHER
FROPA THIS WEEKEND, WHICH IS ADVERTISED IN THE CURRENT ZONES.

PRELIMINARY GUIDANCE FOR COORDINATION ONLY. OFFICIAL FORECASTS ARE
CONTAINED WITHIN THE DODGE CITY ZONE FORECAST.

DDC   90  45  58  46 /  30  60   0  50
GCK   88  43  55  47 /   0  60   0  50
EHA   88  45  59  46 /   0  40   0  30
LBL   89  49  62  49 /   0  40  40  50
HYS   90  49  56  48 /  30  70   0  50
P28   89  63  73  53 /  30  60  40  60

.DDC...NONE.

FCSTID = UMSCHEID/07

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