Severe Thunderstorm Warning 313, NWS Wichita, KS

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE WICHITA KS
315 PM CDT THU OCT 4 2001

AT 18Z...SFC BOUNDARY LOCATED FROM JUST NORTH OF HUT TO JUST NORTH
OF EMP. THIS BOUNDARY HAS MOVED LITTLE THIS MORNING...BUT AS UPPER
JET STREAK CONTINUES TO DIG ACROSS THE PLAINS...AND WE BECOME
INFLUENCED BY THE RR QUAD OF UPPER JET BETWEEN 00Z-03Z...
THE FRONT SHOULD BEGIN TO PUSH SOUTH. THE MODELS ARE IN GOOD
AGREEMENT THAT THIS FRONT PUSHES THROUGH ALL BUT SE KS BY 06Z. ETA
FORECASTS STRONG 1000-850MB FRONTOGENESIS BETWEEN 00 AND 06Z ALONG
THIS BOUNDARY...SO EXPECT TSRA TO BREAK OUT EARLY THIS EVENING ALONG
THE BOUNDARY. LAPS SOUNDINGS SHOW CAPES ALREADY IN EXCESS OF 1250
J/KG FROM WICHITA EASTWARD...SO SVR STORMS POSSIBLE THIS EVENING.
UPPER DIVERGENCE INCREASES IN SE KS BETWEEN 00-06Z AND WITH PCPN
WATER VALUES IN EXCESS OF 1.50 INCHES...HEAVY RAINS
LIKELY...ESPECIALLY EAST OF THE TURNPIKE. AS FAR AS TEMPS
GO...STRONG COLD AIR ADVECTION BEHIND THE BOUNDARY WILL PUSH LOWS
WELL INTO THE 40S...EXCEPT IN EXTREME SOUTHEAST KS WITH TEMPS NEAR
50.

ISENTROPIC LIFT SHIFTS SOUTH OF THE KANSAS SHORTLY AFTER 12Z
FRIDAY...HOWEVER WITH MAIN UPPER SYSTEM NOT MOVING THROUGH UNTIL
AFTER 18Z WILL KEEP A CHANCE OF RAIN FOR THE AREA...WITH GREATEST
CHANCES IN SE ZONES. WITH 850MB TEMPS PLUMMETING THROUGH THE
DAY...TEMPS WILL LIKELY REMAIN STEADY OR FALL IN SRN KS.

BECOMING CONCERNED ABOUT FROST POTENTIAL FRIDAY NIGHT. LARGE SFC
RIDGE SLIDES SOUTH ACROSS THE AREA...AND WITH LIGHT WINDS/MOSTLY
CLEAR SKIES COMBINED WITH DEWPOINTS IN THE 20S...WILL LOWER LOW
TEMPS FRIDAY NIGHT TO COOLEST FWC VALUES. HOWEVER...ANTICIPATED
WET GROUND MAY HOLD TEMPS ABV FREEZING. STILL...WILL ALSO ISSUE AN
SPS TO HIGHLIGHT THIS CONCERN.

ETA FCST SOUNDINGS FOR SATURDAY INDICATE A VERY DRY PROFILE AND WITH
1000-850MB THICKNESSES RECOVERING NICELY...SHOULD SEE HIGHS BACK
INTO THE 60S.

EXTENDED:

THE MAIN CONCERN WITH THE EXTENDED PORTION OF THE FORECAST WILL BE
THE CHANCES FOR CONVECTION...AS WELL AS THE TIMING OF THE NEXT
FRONTAL PASSAGE.

BY SUNDAY AFTERNOON...THE COLD CANADIAN HIGH PRESSURE SYSTEM WILL
MOVE OFF TO OUR EAST...ALLOWING A SOUTHERLY FLOW OF AIR TO RETURN.
HIGH SHOULD RANGE FROM THE MID 60S ACROSS THE EASTERN SECTIONS...TO
NEAR 70 OVER THE FAR WESTERN SECTIONS DUE TO BETTER MIXING AND
WARMER MID LEVEL TEMPERATURES.

A 40 KNOT LOW LEVEL JET WILL DEVELOP LATE SUNDAY NIGHT...SO WOULD
EXPECT SOME SCATTERED ELEVATED CONVECTION TO DEVELOP AFTER
MIDNIGHT.  LOW TEMPERATURES SUNDAY SHOULD ONLY DROP TO BETWEEN 50
AND 55 AS LOW CLOUDINESS DEVELOPS ALONG WITH INCREASING SURFACE
DEWPOINTS.

WILL CONTINUE THE CHANCES FOR SHOWERS AND THUNDERSTORMS ON BOTH
MONDAY AND TUESDAY.  THE BEST CHANCE OF SHOWER AND THUNDERSTORM
ACTIVITY ON MONDAY WILL BE IN THE MORNING WITH LINGERING ELEVATED
CONVECTION.  THE BETTER CHANCE FOR WIDESPREAD CONVECTION WILL BE ON
TUESDAY AS OUR NEXT COLD FRONT MOVES INTO THE REGION.  AS FOR
TEMPERATURES...THE HIGHS ON MONDAY AND TUESDAY WILL LIKELY BE HELD
DOWN SOMEWHAT DUE TO THE LOW CLOUDINESS AND THEN THE TIMING OF THE
FRONT.  THEREFORE...WILL KEEP READINGS GENERALLY IN THE RANGE OF THE
MID 60S...TO LOW 70S.  HOWEVER...THERE IS THE POTENTIAL FOR
TEMPERATURES TO GET MUCH WARMER IF THE SUN BREAKS OUT.  LOWS MONDAY
NIGHT SHOULD ONLY FALL BETWEEN 55 AND 60...WITH LOW CLOUDS AND 60+
DEWPOINTS TRYING TO CROSS THE OKLAHOMA BORDER.

THE AIRMASS WITH THE NEXT FRONT WILL BE MORE PACIFIC...SO IT SHOULD
NOT BE AS COLD.  GENERALLY LOOKING AT LOWS IN THE 40 TO 45 DEGREE
RANGE AND HIGHS BETWEEN 60 AND 65 ON WEDNESDAY.

HYSELL/FRANK
FCSTID = 12
ICT   46  47  34  65 /  90  40   0   0
HUT   46  47  32  66 /  90  40   0   0
EWK   46  47  34  65 /  90  40   0   0
EQA   46  47  34  64 /  90  40   0   0
WLD   50  50  34  65 /  90  40   0   0
RSL   42  50  33  68 /  80  40   0   0
GBD   42  49  33  68 /  80  40   0   0
SLN   42  49  33  67 /  80  40   0   0
MPR   42  49  33  67 /  80  40   0   0
CFV   52  52  34  61 /  90  50   0   0
CNU   49  49  34  61 /  90  50   0   0
K88   49  49  33  60 /  90  50   0   0

.ICT...
KS...NONE.

KSZ032-033-047>053-067>072-082-083-091>096-098>100-050900-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WICHITA KS
345 PM CDT THU OCT 4 2001

...THE COLDEST TEMPERATURES OF THE SEASON ARE EXPECTED SATURDAY
MORNING..

A STRONG COLD FRONT WILL PUSH SOUTH ACROSS KANSAS TONIGHT. BEHIND
THE FRONT THE COLDEST AIR OF THE SEASON WILL SPILL INTO OUR AREA.
ON FRIDAY...BLUSTERY NORTH WINDS AND STEADY TEMPERATURES...GENERALLY
BETWEEN 45 AND 50 DEGREES...WILL BE COMMON.

BY FRIDAY NIGHT...SKIES WILL CLEAR AND WINDS WILL DIMINISH. THIS
WILL ALLOW TEMPERATURES TO FALL INTO THE MIDDLE 30S FOR MUCH OF
THE AREA EARLY SATURDAY MORNING. WHILE WIDESPREAD TEMPERATURES
BELOW FREEZING ARE NOT EXPECTED...SOME PATCHY FROST IN LOW LYING
AREAS MAY BE FOUND. PROTECTIVE MEASURES SHOULD BE TAKEN TO PROTECT
SENSITIVE VEGETATION.

HYSELL