Severe Thunderstorm Warning 36, NWS Wichita, KS

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE WICHITA KS
1030 AM CDT SAT APR 14 2001

UPDATE...

EXPECT SEVERE THUNDERSTORMS LATER TODAY.

LATEST SATELLITE SHOWS AN IMPRESSIVE WAVE NOW MOVING INTO WESTERN
COLORADO WHILE WAA PATTERN CONTINUES TO SUPPORT ELEVATED STORMS INTO
EASTERN OKLAHOMA. MORNING UPPER AIR SHOWS MOIST AXIS AT 850 MB
SURGING INTO CENTRAL KS MAINLY EAST OF  DDC AND WEST OF ICT...AND
THIS IS EVIDENCED BY THE 4-6000FT STRATOCUMULUS DECK NOW WIDESPREAD
ACROSS THIS REGION. NEXT...CAREFUL PRESSURE ANALYSIS INDICATES A
WEAK BUT EXTREMELY IMPORTANT BOUNDARY LOCATED FROM NEAR INDEPENDENCE
THROUGH NORTHERN OKLAHOMA WEST TO NEAR LIBERAL.  IMMEDIATELY SOUTH
OF THIS BOUNDARY ARE 55 TO 60F DEWPOINTS WHILE LOWER 60F DEWPOINTS
ARE WIDESPREAD ACROSS WESTERN OK. BEST 3HR PRESSURE FALLS ARE
CENTERED ACROSS DDC/S CWA AND BOUNDARY LAYER WINDS ARE BEGINNING TO
RESPOND TO PRESSURE FALLS AND APPROACH OF WAVE AS WITHIN THE LATEST
HOUR THE SHALLOW BOUNDARY HAS MIXED TO JUST SOUTH OF PONCA CITY.
MEANWHILE...AT 700MB TEMPERATURES REMAIN IN THE +2 T0 +4C RANGE. IN
ADDITION...A DRYLINE IS ALREADY PRESENT JUST WEST OF LIBERAL SOUTH
THROUGH THE TX PANHANDLE.

FIRST OFF...AFTER LOOKING AT THE SATELLITE AND SURFACE/UPPER AIR
APPEARS THAT THE STRONGEST MOISTURE SURGE AND MOST LIKELY AREA FOR A
RAPID NORTHWARD MOVEMENT OF THE SHALLOW BOUNDARY WILL TAKE PLACE
WITHIN THE AXIS OF STRONGEST 850MB MOISTURE ADVECTION. WOULD EXPECT
THE FRONT TO MOVE NORTH INTO SOUTH CENTRAL KS BY MIDDAY. AS MOISTURE
WITHIN THE BOUNDARY LAYER INCREASES EXPECT MARGINAL SURFACE BASED
INSTABILITY OF AROUND 1000J/KG TO DEVELOP MAINLY FROM ICT TO HUT
SOUTH AND SOUTHWESTWARD. VIS SATELLITE IS ALREADY SHOWING SHALLOW
CONVECTIVE NATURE OF THE CLOUDS WITHIN THE AXIS OF STRONGEST 850MB
MOISTURE/TEMP ADVECTION AROUND AND SOUTHWEST OF ENID OK.  LATEST
RUNS OF THE RUC AND MESOETA ALSO SUGGEST THAT ELEVATED OR HIGH BASED
SFC CONVECTION MAY BREAK OUT AROUND 18Z WITHIN AND ON THE NOSE OF
THE LOW LEVEL MOISTURE RIDGE. ANY INITIAL SEVERE THREAT APPEARS TO
BE LIMITED TO LARGE HAIL GIVEN LIMITED MOISTURE PARAMETERS.

HOWEVER...AFTER 20-22Z...THE COMBINATION OF CONTINUING MOISTURE
ADVECTION ALONG WITH CONTINUED SURFACE HEATING AND MIXING OF THE
BOUNDARY NORTH WILL INTERACT WITH MID LEVEL COOLING AND INCREASING
UPPER DIV ASSOCIATED WITH APPROACHING WAVE/UPPER JET STREAK TO
PRODUCE RAPID STORM DEVELOPMENT.  EXPECT ACTIVITY TO BE FOCUSED
WHERE THE SHALLOW BOUNDARY MIXES NORTH...AND ALSO EXPECT SCATTERED
SUPERCELLS TO DEVELOP ALONG A EASTWARD PUSHING DRYLINE. IN
FACT...THE GREATEST INSTABILITY WOULD ACTUALLY EXIST NEAR THE
DRYLINE WHERE THE STEEPEST LAPSE RATES WHERE ALSO BE LOCATED. FEEL
THAT GIVEN STRENGTH OF WIND FIELDS AND AMOUNT OF DIRECTIONAL
TURNING...THAT A TORNADO THREAT WILL EXIST IN LOCATIONS THAT SEE
LOWER 60F DEWPOINTS ALONG WITH LOCALLY BACKED SURFACE
WINDS...ESPECIALLY IF THESE PARAMETERS OCCUR WHERE THE WESTERN
PORTION OF THE SHALLOW BOUNDARY MEETS THE DRYLINE.

LOOKS LIKE THE GREATEST THREAT FOR STORMS WOULD OCCUR ALONG AND
NORTHWEST OF THE TURNPIKE THIS AFTERNOON..x.WHILE SE KS MAY SEE A
LULL IN ACTION THROUGH THE AFTERNOON.

WILL UPDATE THE FCST AND WILL ISSUE AN HWOICT OUTLINING THE ABOVE
BETWEEN 11AM AND NOON.

CO

.ICT...NONE.

KSZ032-033-047>053-067>072-082-083-091>096-098>100-142000-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE WICHITA KS
1135 AM CDT SAT APR 14 2001

A HAZARDOUS WEATHER OUTLOOK HAS BEEN ISSUED FOR THE FOLLOWING
COUNTIES IN:

CENTRAL KANSAS...
         RUSSELL             BARTON              LINCOLN
         ELLSWORTH           RICE                SALINE
         MCPHERSON           MARION              CHASE

SOUTH CENTRAL KANSAS...
         RENO                KINGMAN             HARPER
         HARVEY              SEDGWICK            SUMNER
         BUTLER              COWLEY

SOUTHEAST KANSAS...
         GREENWOOD           ELK                 CHAUTAUQUA
         WILSON              WOODSON             MONTGOMERY
         ALLEN               NEOSHO              LABETTE

THE SYNOPSIS:

AS OF MIDDAY...A WARM FRONT WAS LOCATED FROM NEAR INDEPENDENCE TO
NEAR WINFIELD TO NEAR MEDICINE LODGE. LOW LEVEL MOISTURE CAPABLE
OF SUPPORTING SEVERE THUNDERSTORM DEVELOPMENT IS LOCATED JUST SOUTH
OF THIS FRONT ACROSS NORTH CENTRAL AND CENTRAL OKLAHOMA. IN ADDITION
A DRYLINE IS LOCATED ACROSS SOUTHWESTERN KANSAS. LASTLY...AN UPPER
LEVEL DISTURBANCE WAS MOVING THROUGH THE HIGH COUNTRY OF COLORADO...
AND THIS WAVE WILL MOVE ACROSS KANSAS THIS AFTERNOON.

IT APPEARS THAT THE PROCESS OF STRONG MOISTURE RETURN AROUND THE
5000 FOOT LEVEL MAY ALLOW SCATTERED THUNDERSTORMS TO DEVELOP BY
EARLY AFTERNOON ACROSS PORTIONS OF SOUTH CENTRAL AND CENTRAL
KANSAS. A FEW OF THESE STORMS MAY BE CAPABLE OF PRODUCING LARGE
HAIL.

AFTER 3 PM...THE WARM FRONT IS FORECAST TO MOVE INTO SOUTH CENTRAL
KANSAS. AT THE SAME TIME THE UPPER AIR DISTURBANCE WILL SWEEP INTO
KANSAS INCREASING THE UPWARD LIFT AND ELIMINATING ANY CAPPING
INVERSION THAT WILL BE PRESENT THROUGH MID AFTERNOON. THIS
DISTURBANCE WILL ALSO FORCE A DRYLINE EAST TO A GREAT BEND TO
MEDICINE LODGE LINE LATER THIS AFTERNOON. THUNDERSTORMS WILL LIKELY
BECOME FOCUSED NEAR THE DRYLINE AND NEAR THE WARM FRONT.

THE MAIN THREATS WITH ANY STORMS LATER THIS AFTERNOON WILL BE
DAMAGING WINDS AND LARGE HAIL. HOWEVER...ANY STORMS THAT DEVELOP
NEAR THE WARM FRONT AND ALONG THE DRYLINE WILL HAVE THE POTENTIAL
TO PRODUCE TORNADOES. AT THIS TIME THE AREA WITH GREATEST TORNADO
POTENTIAL APPEARS TO BE ALONG AND WEST OF A EUREKA TO WINFIELD
LINE AND ALONG AND SOUTH OF A NEWTON TO HUTCHINSON LINE LATER THIS
AFTERNOON.

SPOTTER ACTIVATION WILL BE POSSIBLE AFTER 1 PM ACROSS SOUTH CENTRAL
KANSAS AND WILL BE NEEDED ALONG AND WEST OF A EUREKA TO SEDAN LINE
AFTER 3 PM.

CO

KSZ032-033-047>053-067>072-082-083-091>096-098>100-140901-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WICHITA KS
301 PM CDT SAT APR 14 2001

THE NATIONAL WEATHER SERVICE IN WICHITA IS ACTIVATING OUR
SKYWARN SPOTTER NETWORK.

A SKYWARN OPERATOR IS MONITORING AREA NETWORKS.

THE PRIMARY SKYWARN FREQUENCY IS 444.0 MHZ.

EMERGENCY TRAFFIC WILL BE ON 146.82 MHZ.

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