Special Weather Statement, NWS Kansas City, MO

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
1250 PM CDT SUN MAY 2 2010

...UPDATED AVIATION DISCUSSION...

.DISCUSSION...

IN THE SHORT TERM...WV INDICATES STRONGER 700MB S/W TROUGH RAPIDLY
LIFTING NORTHWARD THROUGH EASTERN KANSAS THIS MORNING.  SHRA HAVE
NEARLY DISSIPATED AHEAD OF THIS WAVE AS SLIGHTLY STRONGER H850
WESTERLIES ARE PULLING DRIER LOW-LVL AIR INTO THE LOCAL AREA.
OTHERWISE...ABSENT OF ANY REALLY GOOD SURGE OF DRY AIR AT THE SFC
AND RATHER VARIABLE SFC WINDS THE PAST 24 HOURS...DEW POINTS REMAIN
ELEVATED IN THE LOWER 50S IN MOST AREAS...WHICH COULD LEAD TO A BIT
OF PATCHY GROUND FOG AGAIN SHOULD POCKETS OF CLEARING WORK NORTHWARD
INTO THE AREA BY DAYBREAK.

MAIN CONCERN FOR TODAY WILL BE WITH A CHC FOR SCT CONVECTION THIS
AFTN AND EVE.  THROUGH THIS MORNING...LARGE UPR TROUGH AXIS TO OUR
WEST WILL GRADUALLY BEGIN TO SHIFT EASTWARD PULLING RATHER COLD H500
TEMPS SOME -22C TO -24C OVERHEAD.  AS THIS TROUGH MOVES
EASTWARD...AN ALREADY DEVELOPED SFC TROUGH OVER WESTERN NE NWRD INTO
THE DAKOTAS WILL ALSO CRAWL SE TOWARDS THE MID/LOWER MISSOURI RIVER
VALLEY BY EARLY AFTN.  AHEAD OF THIS SFC TROUGH GIVEN BROKEN
SKIES AND MARGINAL LINGERING DEW POINTS...MLCAPE VALUES SHOULD
APPROACH 700-1000 J/KG BY MID DAY.  SOUNDINGS ALSO SUGGEST LITTLE TO
NO EML AND RELATIVELY LOW CONVECTIVE TEMPS IN THE UPR 60S...THUS SCT
CU SHOULD DEVELOP FAIRLY. HOWEVER...WHILE MUCH BETTER SFC
CONVERGENCE WILL EXIST ALONG THE FRONT IN WESTERN IA...SE NE AND
CENTRAL KS WHERE BETTER STORM INITIATION CHC EXITS...WILL HAVE TO
WATCH LOCALLY FOR ANY MESOSCALE BOUNDARIES WHICH COULD TRIGGER
ISOLATED CONVECTION IN THE AFTN AT PEAK HEATING. DECENT MID-LVL LAPSE
RATES AND LOW FREEZING LVLS NEAR 7500 FT AGL WOULD SUPPORT A MARGINAL
HAIL THREAT...HOWEVER EFFECTIVE SHEAR REMAINS LOW ENOUGH TO PRECLUDE
ANY HIGHER SVR THREAT. A SLIGHTLY ELEVATED WIND THREAT WOULD EXIST IN
AREAS CLOSER TO THE FRONT WHERE LCL WILL BE HIGHER.

THIS FRONT AND ANY SCT CONVECTION ALONG AND AHEAD OF IT WILL TRY TO
SINK SE THROUGH THE CWA DURING THE EVENING AND OVERNIGHT HOURS.
ELEVATED INSTABILITY SHOULD REALLY DIMINISH AFTER SUNSET AS WILL THE
SVR THREAT...BUT SCT SHRA/TSRA WILL STILL BE POSSIBLE.

BY MONDAY...THE SFC FRONT WILL TAIL OFF TOWARD THE OZARKS.  WHILE
PROBABILITIES ARE LOW...ENOUGH MOISTURE AND CONVERGENCE MAY EXIST
FOR A FEW SHRA/TSRA TO DEVELOP IN THE EXTREME SOUTHERN CWA MON AFTN
ALONG THE WANING FRONT.  TEMPS HOWEVER WILL BE FAIRLY
PLEASANT.  MIXING DOWN FROM H850 WOULD SUGGEST READINGS RIGHT AROUND
NORMAL.

TUESDAY AND WEDNESDAY...EXPECTING DRY WEATHER BOTH DAYS.  BY
TUESDAY...QUASI-ZONAL FLOW WILL PREVAIL ALLOWING SFC TROUGHING TO
DEVELOP OVER THE WESTERN PLAINS.  FOR US...THIS WILL MEAN
SPECTACULAR CONDITIONS ALBEIT WINDY. DECENT MIXING UP TO NEAR H850
SHOULD RESULT IN TEMPS EITHER SIDE OF 80 IN MOST AREAS.  MODELS ARE
IN RELATIVE AGREEMENT PULLING A SFC FRONT INTO THE REGION BY
WEDNESDAY...PERHAPS EVEN BISECTING THE CWA BY WED AFTN. SOUNDINGS
VERY DRY SO EXPECTING A DRY FRONTAL PASSAGE.  HOWEVER THIS FRONT
COULD PLAY HAVOC WITH THE TEMPERATURE FORECAST BOTH WEDNESDAY AND
THURSDAY.

DUX

&&

.AVIATION...

FOR THE 18Z TAFS...A WEAK ELEVATED BOUNDARY AND UPPER LEVEL WAVE HAVE
MANAGED TO DESTABILIZE THE ATMOSPHERE ENOUGH TO GET STORMS GOING
ACROSS NORTHWEST MISSOURI...TAILING BACK INTO EAST CENTRAL KANSAS.
STORMS WILL PULSE UP AND DOWN TODAY...FALLING APART ALMOST AS FAST AS
THEY GO UP. CURRENT ORIENTATION OF THE INSTABILITY LINE HAS THE
STORMS GOING UP JUST WEST OF THE KMCI TERMINAL...WITH THOUGHTS BEING
THAT CURRENT STORMS ON RADAR WILL MOVE IN BETWEEN 18Z AND 19Z.
HOWEVER...GIVEN THE PULSE NATURE OF THE ACTIVITY...THINKING THAT THE
STORMS WILL REMAIN WIDELY SCATTERED THROUGH THE AFTERNOON HOURS.
THEREFORE...AT THE KSTJ AND KMKC TERMINALS HAVE GONE WITH VICINITY
THUNDER AT 18Z...AND GO WITH A PREVAILING VICINITY THUNDER AT KMCI AT
19Z. WILL LIKELY HAVE TO AMEND MULTIPLE TIMES THROUGH THE AFTERNOON
HOURS THOUGH DEPENDENT ON INDIVIDUAL STORMS. EXPECT THE ACTIVITY TO
DIE DOWN AS THE SUN LOWERS LATE IN THE AFTERNOON TO EVENING HOURS.

CUTTER

&&

.EAX WATCHES/WARNINGS/ADVISORIES...
MO...NONE.
KS...NONE.
&&

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
1258 PM CDT SUN MAY 2 2010

KSZ025-057-060-102>105-MOZ001>008-011>017-020>025-028>033-037>040-
043>046-053-054-031800-
ATCHISON KS-MIAMI-LINN KS-DONIPHAN-LEAVENWORTH-WYANDOTTE-
JOHNSON KS-ATCHISON MO-NODAWAY-WORTH-GENTRY-HARRISON-MERCER-
PUTNAM-SCHUYLER-HOLT-ANDREW-DE KALB-DAVIESS-GRUNDY-SULLIVAN-ADAIR-
BUCHANAN-CLINTON-CALDWELL-LIVINGSTON-LINN MO-MACON-PLATTE-CLAY-
RAY-CARROLL-CHARITON-RANDOLPH-JACKSON-LAFAYETTE-SALINE-HOWARD-
CASS-JOHNSON MO-PETTIS-COOPER-BATES-HENRY-
1258 PM CDT SUN MAY 2 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHWEST...NORTH CENTRAL
AND WEST CENTRAL MISSOURI...AS WELL AS EXTREME EASTERN KANSAS.

.DAY ONE...THIS AFTERNOON AND TONIGHT

A WEAK FRONT HAS BEGUN TO SLIDE TOWARDS THE REGION THIS AFTERNOON.
AHEAD OF THIS FRONT...A SLIGHTLY UNSTABLE AIRMASS HAS DEVELOPED
ACROSS PORTIONS OF EASTERN KANSAS AND THE NORTHWESTERN THIRD OF
MISSOURI. SCATTERED THUNDERSTORMS HAVE BEGUN TO DEVELOP ALONG AND
WELL AHEAD OF THIS COLD FRONT IN EASTERN KANSAS AND WESTERN MISSOURI
EARLY THIS AFTERNOON AND SLOWLY MOVE EAST SOUTHEAST. A FEW STRONG TO
ISOLATED SEVERE STORMS MAY BE POSSIBLE IN AREAS ALONG AND NORTHWEST
OF A LINE FROM HARRISONVILLE TO CHILLICOTHE AND PRINCETON. DUE TO
RATHER COLD TEMPERATURES ALOFT...THE PRIMARY THREAT FROM
THUNDERSTORMS WILL BE LARGE HAIL AND DAMAGING WINDS.

SHOWERS AND THUNDERSTORMS WILL DIMINISH IN INTENSITY AFTER
SUNSET. HOWEVER THUNDERSTORMS WHICH DEVELOP FURTHER NORTHWEST ALONG
THE FRONT IN NORTH CENTRAL KANSAS AND SOUTHEAST NEBRASKA WILL
CONTINUE TO MOVE EAST SOUTHEAST THROUGH THE REMAINDER OF THE OUTLOOK
AREA OVERNIGHT.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

THERE WILL BE A CHANCE FOR THUNDERSTORMS THURSDAY NIGHT INTO
FRIDAY...MAINLY IN NORTHERN MISSOURI. AT THIS TIME SEVERE WEATHER IS
NOT EXPECTED.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED ACROSS NORTHEASTERN KANSAS AND
NORTHWESTERN AND WESTERN MISSOURI EARLY THIS AFTERNOON THROUGH THIS
EVENING.

CUTTER

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