Severe Thunderstorm Warning 54, NWS Wichita, KS

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE WICHITA KS
1125 PM CDT WED APR 22 2009

.AVIATION...06Z TAFS KRSL/KSLN/KHUT/KICT/KCNU
WEAK SHORTWAVE WAS MOVING EWD OVER CENTRAL KS LATE THIS EVE. THIS
FEATURE WILL CONTINUE TRACKING E-NEWD AND WILL MOVE OUT OF NERN KS
THURS AM. SCT TS EXPECTED TO CONTINUE OVER CNTRL INTO E-CNTRL KS
OVERNIGHT ON THE NORTH EDGE OF THE MID-LEVEL BAROCLINIC ZONE.
VARIABLE GUSTY WINDS WILL BE ASSOCIATED WITH THE CONVECTION. FOR
THURS...LEE TROF WILL LEAD TO S-SERLY WINDS ACROSS THE AREA.

JMC

&&

.PREV DISCUSSION... /ISSUED 948 PM CDT WED APR 22 2009/

UPDATE...
HAVE INCREASED/ADDED POPS ACROSS THE FORECAST AREA FOR TONIGHT.
THIS IS IN PART DUE TO LATEST RADAR TRENDS. IN ADDITION...THE
RUC40 AND 00Z NAM-WRF CONTINUE TO SHOW A VERY TIGHT ISENTROPIC
PRESSURE GRADIENT (310K) FROM W TO E ACROSS OUR AREA FOR MUCH OF
NIGHT WITH DEVELOPING 35 KT LOW-LEVEL JET TRANSPORTING ELEVATED
INSTABILITY INTO THIS BAROCLINIC ZONE. A FEW STRONG TO MARGINALLY
SEVERE STORMS REMAIN POSSIBLE OVERNIGHT GIVEN THE INSTABILITY AND
30KT OF EFFECTIVE SHEAR.

JMC

PREV DISCUSSION... /ISSUED 635 PM CDT WED APR 22 2009/

AVIATION...00Z TAFS KRSL/KSLN/KHUT/KICT/KCNU
WEAK SHORTWAVE VISIBLE OVER WRN KS EARLY THIS EVE...WILL SLOWLY
MOVE E-NEWD ACROSS KS TONIGHT INTO THURS. BEST SIGNAL FOR
CONVECTION WITH THIS FEATURE PER NAM-WRF IS IN CNTRL/NERN KS WHERE
INSTABILITY/ISENTROPIC LIFT SHOULD MAXIMIZE. GFS SEEMS TO BE NOT
PICKING UP ON CURRENT TS ACTIVITY. WILL UTILIZE VCTS IN CNTRL KS
SITES DUE TO ANTICIPATED ISOLD-SCT COVERAGE AND ADJUST AS NEEDED.
CONVECTION SHOULD BE PUSHING NEWD OUT OF CNTRL KS THURS AM. WILL
INCLUDE A TEMPO MVFR BR GROUP AT HUT EARLY THURS AM MAINLY DUE TO
LOCAL RADIATION EFFECTS.

JMC

PREV DISCUSSION... /ISSUED 328 PM CDT WED APR 22 2009/

DISCUSSION...

THE MAIN CONCERN WITH THIS FORECAST PACKAGE WILL BE THE POTENTIAL
FOR ELEVATED STRONG TO SEVERE CONVECTION THIS EVENING IN CENTRAL
KANSAS. THE NEXT CONCERN IS THE TIMING OF SHORTWAVES MOVING THROUGH
THE AREA THIS WEEKEND.

TONIGHT:
LATEST WATER VAPOR LOOP WAS SHOWING A SUBTLE POTENTIAL VORTICITY
ANOMALY MOVING THROUGH NORTHERN COLORADO AND SOUTHERN WYOMING. IN
RESPONSE TO THIS WAVE...WE ARE SEEING SOME ELEVATED CONVECTION
DEVELOPING OVER NORTHEAST COLORADO. LATEST VISIBLE IMAGERY WAS ALSO
SHOWING QUITE A BIT OF ACCAS NEAR A BAROCLINIC ZONE DEVELOPING OVER
SOUTHWEST KANSAS WITH EVEN A THUNDERSTORM DEVELOPING JUST WEST OF
PRATT. MODELS SEEMED TO DO A FAIRLY GOOD JOB ON THE MODEL
INITIALIZATIONS REGARDING THE MOISTURE PROFILES OVER DODGE CITY THIS
MORNING. EVEN THOUGH SURFACE DEWPOINTS ARE IN THE 45 TO 50 DEGREE
RANGE...WE HAVE QUITE A BIT OF EVELATED CAPE (1000-1500J/KG) MAINLY
ABOVE 700MB. HAVILAND SHEAR PROFILE IS ALSO SHOWING DECENT 700-500MB
SHEAR IN PLACE AROUND 30KTS. AS A RESULT...I WOULD NOT BE SURPRISED
TO SEE A FEW STRONG TO SEVERE STORMS THIS EVENING MAINLY IN CENTRAL
KANSAS...ESPECIALLY IF THE POTENTIAL VORTICITY ANOMALY STRENGTHENS
AND THE LOW LEVEL JET ENHANCES AS THE ANOMALY APPROACHES. OVERNIGHT
THINGS SHOULD BEGIN TO CLEAR OUT AS THE SHORTWAVE MOVES OUT OF THE
AREA.

THURSDAY-SATURDAY:
LATEST WATER VAPOR LOOP WAS SHOWING THE NEXT SHORTWAVE OVER THE
PACIFIC NORTHWEST. THIS FEATURE IS PROGGED TO AFFECT THE REGION
THIS WEEKEND. AS THIS FEATURE DIVES INTO THE ROCKIES...THIS WILL
INDUCE STRONGER RETURN FLOW WHICH WILL HELP FEED HIGHER DEWPOINTS
INTO THE REGION. IN ADDITION...THE LEE SIDE TROF WILL STRENGTHEN
OVER THE ROCKIES AND CAUSE THE WIND SPEEDS TO REALLY INCREASE ON
FRIDAY AND SATURDAY. AS THE PREVIOUS FORECASTER MENTIONED...WE WOULD
NOT BE SURPRISED TO WIND ADVISORY CRITERIA BEING REACHED. WE WENT
AHEAD AND BACKED OFF ON POPS MAINLY ACROSS SOUTH CENTRAL AND
SOUTHEAST KANSAS ON SATURDAY DUE TO A DECENT MID LEVEL CAP IN PLACE.

SUNDAY-WEDNESDAY:
THE MODELS ARE STILL SHOWING SOME DISCREPANCIES ON THE TIMING OF THE
NEXT WAVE MOVING FROM THE ROCKIES INTO THE PLAINS. THE ECMWF IS
STILL ABOUT 12 HOURS SLOWER THAN THE GFS IN MOVING THIS WAVE INTO
THE NORTHERN PLAINS. WE ARE FAVORING THIS SOLUTION FOR NOW BASED ON
MODEL CONSISTENCY. AS A RESULT...WE ARE THINKING THAT THE BEST
SEVERE CHANCES MAY STILL BE THE LATE SATURDAY NIGHT/SUNDAY TIMEFRAME
WITH THE MORE SIGNIFICANT WAVE MOVING INTO THE NORTHERN PLAINS. THIS
WILL PUSH THE FRONT INTO SOUTHERN KANSAS BY MONDAY MORNING. THE NEXT
PROBLEM IS THE MODELS ARE STALLING OUT THIS BOUNDARY ACROSS SOUTHERN
KANSAS ON MONDAY AND TUESDAY WHICH WILL SET THE STAGE FOR THE NEXT
WAVE MOVING THROUGH THE ROCKIES INTO THE PLAINS ON MONDAY. THIS
TIMEFRAME MAY NEED TO BE WATCHED FOR POSSIBLE FLOODING. WE WILL
CONTINUE TO MONITOR FOR NOW.

COX

AVIATION...18Z TAFS KRSL/KHUT
ISOLD TSRA HAVE DEVELOPED OVER W & NW KS AS A WEAK UPPER-LEVEL
IMPULSE APPROACHES FROM ERN CO. AS SUCH HAVE INTRODUCED VCTS TO
KRSL & KHUT FOR PRIMARILY THIS EVENING TO ALERT ONE & ALL TO THE
PRESENCE OF SUCH ACTIVITY. CIGS TO REMAIN IN VFR STATUS THROUGHOUT
THE LATE AFTERNOON & EVENING.

&&

.PRELIMINARY POINT TEMPS/POPS...
WICHITA-KICT    57  85  61  84 /  30   0   0   0
HUTCHINSON      57  86  60  85 /  50   0   0   0
NEWTON          57  85  61  84 /  50   0   0   0
ELDORADO        57  85  61  83 /  40   0   0   0
WINFIELD-KWLD   57  85  62  83 /  20   0   0   0
RUSSELL         55  87  57  87 /  70  10   0  10
GREAT BEND      55  87  57  86 /  60   0   0  10
SALINA          56  87  59  85 /  60  10   0   0
MCPHERSON       56  86  60  85 /  50  10   0   0
COFFEYVILLE     57  84  63  81 /  20   0   0   0
CHANUTE         56  83  62  81 /  30  10   0   0
IOLA            56  83  62  81 /  30  10   0   0
PARSONS-KPPF    57  83  63  81 /  30  10   0   0

&&

.ICT WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE WICHITA KS
859 PM CDT WED APR 22 2009

KSZ032-033-047>053-067>072-082-083-091>096-098>100-240200-
RUSSELL-LINCOLN-BARTON-ELLSWORTH-SALINE-RICE-MCPHERSON-MARION-CHASE-
RENO-HARVEY-BUTLER-GREENWOOD-WOODSON-ALLEN-KINGMAN-SEDGWICK-HARPER-
SUMNER-COWLEY-ELK-WILSON-NEOSHO-CHAUTAUQUA-MONTGOMERY-LABETTE-
859 PM CDT WED APR 22 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL KANSAS...
SOUTH CENTRAL KANSAS AND SOUTHEAST KANSAS.

.DAY ONE...TONIGHT

A FEW STRONG TO SEVERE THUNDERSTORMS WILL BE POSSIBLE TONIGHT
MAINLY ACROSS CENTRAL AND PART OF SOUTH CENTRAL KANSAS. THE MAIN
THREATS WILL BE PENNY TO QUARTER SIZE HAIL AND 50 TO 60 MPH WIND
GUSTS.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

HIGH GRASSLAND FIRE DANGER WILL ENCOMPASS MUCH OF THE AREA BY
THURSDAY AFTERNOON.

STRONG SOUTH WINDS ARE EXPECTED ON FRIDAY AND SATURDAY WHICH WILL
CAUSE THE GRASSLAND FIRE DANGER INDEX TO BE IN THE HIGH TO VERY
HIGH CATEGORY.

CONFIDENCE IS INCREASING THAT SCATTERED STRONG TO SEVERE
THUNDERSTORMS WILL OCCUR ACROSS THE AREA SATURDAY NIGHT THROUGH
TUESDAY...AS A COLD FRONT APPROACHES FROM THE NORTHWEST AND
INTERACTS WITH A MOIST AND UNSTABLE AIRMASS ACROSS THE PLAINS. THIS
FRONT MAY BEGIN TO STALL OUT ACROSS THE AREA ON SUNDAY NIGHT AND
MONDAY WHICH MAY ALSO INCREASE THE RISK FOR LOCALIZED FLOODING.
HOWEVER...MUCH UNCERTAINTY EXISTS SURROUNDING THE TIMING OF THE
COLD
FRONT AND VARIOUS UPPER LEVEL DISTURBANCES. STAY TUNED FOR LATER
FORECASTS AND OUTLOOKS.

.SPOTTER INFORMATION STATEMENT...

SKYWARN SPOTTER ACTIVATION IS NOT ANTICIPATED TONIGHT.

&&

FOR A GRAPHICAL VERSION OF THIS INFORMATION...SEE OUR
WEBPAGE AT (LOWERCASE) HTTP://WEATHER.GOV/WICHITA/HWO/HWO.PHP

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WICHITA KS
1231 AM CDT THU APR 23 2009

KSZ053-069-070-230600-
BUTLER-CHASE-GREENWOOD-
1231 AM CDT THU APR 23 2009

...THE NATIONAL WEATHER SERVICE IN WICHITA HAS ISSUED A SIGNIFICANT
WEATHER ALERT FOR BUTLER...CHASE AND GREENWOOD COUNTIES...

AT 1230 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
TRACKING STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 8 MILES
NORTHEAST OF BURNS TO CASSODAY TO 13 MILES SOUTHEAST OF CASSODAY...
AND MOVING EAST AT 35 MPH.

PENNY TO NICKEL SIZE HAIL...AND WINDS TO 50 MPH ARE EXPECTED WITH
THESE STORMS.

THESE STORMS ARE NOT EXPECTED TO BECOME SEVERE.

KETCHAM

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WICHITA KS
1259 AM CDT THU APR 23 2009

KSZ083-230630-
SEDGWICK-
1259 AM CDT THU APR 23 2009

...THE NATIONAL WEATHER SERVICE IN WICHITA HAS ISSUED A SIGNIFICANT
WEATHER ALERT FOR SEDGWICK COUNTY...

AT 1255 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
TRACKING A STRONG THUNDERSTORM NEAR SEDGWICK...OR 12 MILES SOUTHWEST
OF NEWTON...AND MOVING NORTHEAST AT 25 MPH.

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

A STRONG GUST FRONT WILL ALSO ACCOMPANY THE LINE AS IT MOVES ACROSS
WICHITA. THIS LINE MAY PRODUCE GUSTS TO 50 MPH.

KETCHAM

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WICHITA KS
100 AM CDT THU APR 23 2009

KSZ069-230730-
BUTLER-
100 AM CDT THU APR 23 2009

...THE NATIONAL WEATHER SERVICE IN WICHITA HAS ISSUED A SIGNIFICANT
WEATHER ALERT FOR SOUTHEAST BUTLER COUNTY...

AT 159 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING
A STRONG THUNDERSTORM NEAR LEON...OR 15 MILES SOUTHEAST OF EL
DORADO...AND MOVING NORTHEAST AT 30 MPH.

DIME SIZE HAIL...AND WINDS TO 50 MPH ARE EXPECTED WITH THIS STORM.

BE PREPARED TO TAKE SHELTER IN THE EVENT THESE STORMS INTENSIFY AND
BECOME SEVERE, OR A WARNING IS ISSUED BY THE NATIONAL WEATHER
SERVICE.

SEVERE STORMS ARE STILL POSSIBLE NORTH OF THIS STORM ACROSS THE
NORTHEASTERN PORTION OF BUTLER COUNTY.

KETCHAM

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