Special Weather Statement, NWS Kansas City, MO

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
425 AM CDT MON JUN 13 2011

.DISCUSSION...

SHORT TERM (TODAY THROUGH WEDNESDAY)...

ALL IS QUIET SO FAR...COUNTER TO WHAT SUITE OF MESO MODELS SUGGEST
SHOULD BE OCCURRING.  IT APPEARS THAT DIVERGENT H8 FLOW ACROSS NE KS
AND NW MO AND CAPPING INVERSION BETWEEN H9 AND H8 SUPPRESSING
CONVECTION SO FAR.  SOME ENHANCEMENT IN AC/ACCAS FIELD ACROSS
CENTRAL KANSAS EVIDENT ON RECENT IR IMAGERY...WHICH IS NOT TOO
SURPRISING AS 45-50 H8/H7 LLJ IMPINGING ON EDGE OF EML IN THIS
REGION. IF STORMS DO NOT FIRE SOON...BEST CONVERGENCE BY DIURNAL LLJ
MAXIMUM WILL BE LOST...SO MIGHT NOT SEE ANY DEVELOPMENT.
HOWEVER...DECIDED TO BROADBRUSH A NARROW BAND OF SLIGHT CHANCE POPS
ALONG AXIS AC DEVELOPMENT...WHICH APPEARS WELL ALIGNED FAIRLY WELL
WITH BAND OF PRESSURE ADVECTION ALONG 310-312K SURFACE. OVERALL USED
A BLEND OF THE RUC/GEM FOR PRECIPITATION TRENDS IN THE NEAR TERM.
THREAT OF CONVECTION WILL NOT LINGER LONG...AS LLJ WEAKENS AND STOUT
CAP TAKES CONTROL. LEFT A SLIVER OF SLIGHT CHANCE/LOW CHANCE POPS
ACROSS NORTHEAST CWA GIVEN THIS REGION WILL BE LOCATED IN PROXIMITY
TO THE CYCLONIC SHEAR SIDE OF H5 RIDGE. AS FAR AS
TEMPERATURES...READINGS WILL CONTINUE TO EDGE UPWARDS TODAY AS
LOW-MID 20 H8 TEMPERATURES ADVECT INTO SOUTHWEST PORTIONS OF CWA.
THERE WILL BE QUITE A RANGE IN TEMPERATURES...WITH A LIKELY 15-20
DEGREE SPREAD BETWEEN EAST CENTRAL KANSAS AND NORTHEAST MISSOURI.
USED A BLEND OF EC/GEM AS A GENERAL GUIDE FOR TEMPERATURES GIVEN
THEIR PAUCITY OF EVAPORATIVE COOLING IMPACT DUE TO CONVECTION.

CAPPING INVERSION WILL CONTINUE TO BUILD ACROSS THE REGION
TONIGHT...BUT A SHORTWAVE EJECTING ACROSS NORTHERN PLAINS APPEARS TO
ENHANCE CONVERGENCE PROVIDED BY LLJ...THUS THERE MAY BE A SLIGHTLY
BETTER CHANCE OF NOCTURNAL CONVECTION ACROSS NORTHEAST MISSOURI.
THREAT OF STORMS WILL RETURN THE REMINDER OF FORECAST AREA ON
TUESDAY...AS OVERALL H5 HEIGHTS LOWER IN RESPONSE TO MORE VIGOROUS
SHORTWAVE.  CONTINUED TREND OF PREVIOUS FORECASTS OF BROADBRUSHING
ENTIRE FORECAST AREA WITH CHANCE POPS.  H8/H8 THERMAL RIDGE
RE-ORIENTS FURTHER SOUTH DUE TO FALLING HEIGHTS...THUS TRIMMED
TEMPERATURES A DEGREE OR TWO ACROSS MOST OF THE REGION FOR TUESDAY.

WEDNESDAY WILL BE A TRANSITION DAY...IN THE WAKE OF EXPECTED LONG
NIGHT OF CONVECTION ON TUESDAY NIGHT.  WEAK WIND FIELD AND JUNE
INSOLATION WILL KEEP TEMPERATURES ONLY A FEW DEGREES COOLER ON
WEDNESDAY UNDER WEAK LOW LEVEL COOL ADVECTION REGION.  PRECIPITATION
THREAT GRADUALLY WILL END FROM WEST TO EAST AS H5 SHORTWAVE MOVES
FROM NORTHERN PLAINS INTO GREAT LAKES REGION.

MEDIUM RANGE (THURSDAY THROUGH SUNDAY)...

UPPER RIDGING WILL BUILD ACROSS THE PLAINS THURSDAY BEFORE THE NEXT
UPPER SHORTWAVE DAMPENS H5 HEIGHTS ACROSS THE CENTRAL PLAINS
ONCE AGAIN. THIS SHOULD BRING A RETURN TO HIGHER RAIN CHANCES
THROUGH THE END OF THE WORK WEEK AS THE SYSTEM TRANSITIONS TO THE
EAST.  BY THE WEEKEND...UPPER RIDGING RETURNS TO CENTRAL/SOUTHERN
PLAINS WITH NAEFS DEPICTING H5 HEIGHTS AT OR ABOVE 590 DM ACROSS
SOUTHERN PLAINS...WITH TRANSLATES TO MID 20 H8 TEMPS AND H7
TEMPERATURES IN THE 15-16C RANGE.  THIS SHOULD LIMIT OVERALL PRECIP
THREAT FOR THE WEEKEND...AND WILL SIGNAL A RETURN TO ABOVE NORMAL
TEMPERATURES.  GENERALLY FOLLOWED CONSENSUS BLEND...THOUGH
TEMPERATURES MAY NEED TO BE NUDGED UPWARD IN THE OUTER PERIODS.
ACCOUNT.

SF

&&

.AVIATION...

FOR THE 06Z TAFS...CHANCE FOR THUNDERSTORMS STILL RATHER REMOTE AS
ATMOSPHERE REMAINS WELL CAPPED. THE LATEST MODEL RUNS DO STILL TRY
TO DEVELOP AN AREA OF STORMS ALONG AXIS OF VORTICITY ADVECTION IN
ADVANCE OF A WEAK WAVE IN THE UPPER FLOW. TOPEKA SOUNDING INDICATED
THE INVERSION IS STRONG TO ABOUT 650 MB SO IF CONVECTION DOES
INITIATE...EXPECT STORMS TO BE ELEVATED. HAIL STILL WOULD BE THE
MAIN THREAT. AROUND SUNRISE THERE IS A GOOD CHANCE OF SOME MVFR
STRATUS AS LOW LEVEL MOISTURE IS TRAPPED UNDER THE INVERSION. BY
LATE MORNING EXPECT THE CIGS TO SCATTER OUT...BUT ANOTHER ROUND OF
CONVECTION IS POSSIBLE IN THE AFTERNOON AS MID LEVEL LAPSE RATES
REMAIN RELATIVELY STEEP...AROUND 8 DEG K/KM...AND WILL HANDLE WITH A
PROB GROUP FOR NOW. ADOLPHSON
&&

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

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SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
528 AM CDT MON JUN 13 2011

MOZ014-015-023-131115-
DAVIESS MO-GRUNDY MO-LIVINGSTON MO-
528 AM CDT MON JUN 13 2011

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN LIVINGSTON...
SOUTHWESTERN GRUNDY AND EASTERN DAVIESS COUNTIES UNTIL 615 AM CDT...

AT 527 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR JAMESPORT...OR 7 MILES NORTHEAST OF
GALLATIN...MOVING EAST AT 20 MPH.

HAIL UP TO THE SIZE OF NICKELS IS EXPECTED WITH THIS STORM.

THIS STORM WILL BE NEAR...
SPRING HILL AROUND 600 AM CDT.

THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND
TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS... FOR ADDITIONAL
INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE.

LAT...LON 4004 9347 3979 9354 3991 9398 4004 9396
TIME...MOT...LOC 1028Z 279DEG 19KT 3996 9384

DB