Severe Thunderstorm Warning 142, NWS Louisville, KY

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LOUISVILLE KY
250 PM EDT TUE JUN 2 2009

.SHORT TERM (TONIGHT AND WEDNESDAY)...

.THIS AFTERNOON AND EVENING...

CURRENT MESOSCALE ANALYSIS SHOWS LIS OF -7 SOUTH OF INTERSTATE
64...WITH NO CAPPING INVERSION TO HINDER CONVECTIVE DEVELOPMENT.
HAVING REACHED OUR CONVECTIVE TEMPERATURES IN THE MID TO UPPER
80S...EXPECT CONTINUED DEVELOPMENT OF ISOLATED TO SCATTERED
THUNDERSTORMS THIS AFTERNOON...DIMINISHING THIS EVENING. OUR BEST
COVERAGE OF STORMS...PERHAPS 30 TO 40%...WILL STAY SOUTH AND EAST OF
THE BLUEGRASS PARKWAY. STORM MOTION WILL BE AROUND 15 MPH TO THE
NORTHEAST. WITH DRY AIR ALOFT AND STEEP LAPSE RATES...SOME OF THESE
STORMS BE CONTAIN MARGINALLY SEVERE HAIL AND LOCALIZED STRONG WIND
GUSTS.

.OVERNIGHT AND WEDNESDAY...

SCATTERED PULSE TYPE STORMS WILL TEND TO DIMINISH THIS EVENING. A
SHALLOW COLD FRONT IS NOW ALMOST STATIONARY ACROSS CENTRAL INDIANA.
THIS EVENING...A WEAK DISTURBANCE WILL MOVE EAST ALONG THIS BOUNDARY
AND LIKELY SPARK WIDESPREAD OVERNIGHT CONVECTION ACROSS CENTRAL
ILLINOIS AND INDIANA. THIS WILL EVENTUALLY PUSH THE FRONT/OUTFLOW
BOUNDARY SOUTHWARD INTO SOUTHERN INDIANA DURING THE MORNING HOURS.
WILL INCREASE POPS TO HIGH CHANCE NORTH OF THE OHIO RIVER BY THE
MID-MORNING HOURS. THIS COLD FRONT/OUTFLOW BOUNDARY WILL MOVE SOUTH
OF THE OHIO RIVER LIKELY DURING THE EARLY AFTERNOON HOURS.

SHOWERS AND THUNDERSTORMS ARE LIKELY TOMORROW AS INCREASED POOLING
OF MOISTURE DEVELOPS ALONG AND EVEN NORTH OF THE SHALLOW COLD FRONT.
NORTH OF THIS BOUNDARY...THUNDERSTORMS WILL LIKELY BE SLIGHTLY
ELEVATED. THE INTENSITY AND CONCENTRATION OF THUNDERSTORMS TOMORROW
WILL PROBABLY BE HIGHLY DEPENDENT ON LOCAL OUTFLOW BOUNDARIES AND
OTHER MESOSCALE FEATURES SUCH AS LOCALIZED HEATING. STRONG SURFACE
BASED INSTABILITY AND THE POTENTIAL FOR ISOLATED SEVERE STORMS WILL
LIKELY OCCUR AHEAD OF THE SURFACE FRONT...IE...ACROSS CENTRAL AND
SOUTHERN KENTUCKY TOMORROW AFTERNOON.

TEMPERATURES ACROSS NORTHERN INDIANA THIS AFTERNOON WERE QUITE COOL.
TOMORROW HIGHS ACROSS OUR FORECAST MAY VARY WIDELY...FROM THE UPPER
80S AHEAD OF THE BOUNDARY NEAR TENNESSEE...TO THE UPPER 70S
(POTENTIALLY LOWER) ACROSS SOUTHERN INDIAN.

.LONG TERM (WED NIGHT THRU TUE)...

WED NIGHT THRU FRI NIGHT...

AT THE START OF THIS PERIOD...SHRTWV TROF SHUD BE POSITIONED
UPSTREAM IN NW FLO AND GRADUALLY EVOLVE ACROSS OUR FA THU AND DROP
SEWD INTO THE TN VLY THU NIGHT.

AS A RESULT...SOUTHWARD SAGGING CDFNT POSITIONED OVER CENTRAL KY
(GFS/SREF) WED EVE SHUD MAKE IT TO SCNTRL KY BY THU MRNG AND TO SERN
TN/NRN AL BY THU EVE. BASED ON UPPER LEVEL SUPPORT AND A SFC WAVE
FCST TO DEVELOP ON THE FRONT IN ERN AR WED EVE...IT APPEARS WED
NIGHT INTO EARLY THU SHUD BE THE BEST TIME FOR SHOWERS/TSTMS ...WITH
A FOCUSING/LIFTING MECHANISM (FRONT) AND APPROACHING WAVE...WITH
WARM...MOIST AIR OVERRUNNING BNDRY. WILL KEEP POPS TO NEAR 70% FOR
WED NIGHT AND EARLY THU ACROSS THE ENTIRE FA.

SPC HAS PUT THE ERN 2/3RDS OF OUR FA IN A SLIGHT RISK ENDING 12Z
THU. THE BEST TIMING FOR ANY SVR STORMS IN THIS PERIOD WOULD BE WED
EVE ALONG AND TO THE SOUTH OF THE FRONT FROM SCNTRL KY TO ECNTRL KY.
STORMS SHUD WEAKEN AFTER SUNSET WITH WANING INSTABILITY.

OVRRNG RAINS SHUD EXIT OUR FA FROM NW TO SE THU AFTN THRU THU NIGHT
AS FRONT/WAVE CONTINUE SE MOVEMENT AHEAD OF AFOREMENTIONED SHRTWV
TROF. WILL LOWER POPS EARLY THU NIGHT AND REMOVE LATE...WITH ALL
MODELS CONSISTENT WITH THE ONSET OF DRIER AIR OVERSPREADING OUR FA.

SAT THRU TUE...

WILL RUN PRIMARILY WITH HPC WITH THIS FCST WHICH IS MOSTLY A BLEND
OF THE ENSEMBLE MEANS FROM THE GFS AND THE OPS ECMWF. WITH THIS IN
MIND...WILL CONTINUE SLGT CHC POPS FROM SAT NIGHT THRU SUN NIGHT AND
KEEP/INSERT LOW CHC POPS(30) FROM MON THRU TUE NIGHT. THIS IN THE
BALLPARK WITH OUR NEIGHBORING OFFICES.

IT APPEARS MAX TEMPS WILL BE A BIT ABOVE NORMAL SAT-MON...TEMPERED
SOMEWHAT BY CLOUDS/ISOLD TO SCT CONVECTION...ESPECIALLY SUN AND MON.
TUE SHUD BE COOLER AFTER A COOL FROPA.

FOR SAT...HIGH PRES WILL BE DEPARTING TO THE EAST WITH A SLOW
MOVG/DECELERATING CDFNT TRACKING SEWD INTO CENTRAL PARTS OF IL/IN.
WILL KEEP DRY FOR NOW. WEAK MOIST RETURN FLO BEGINS SAT NIGHT AS HI
PRES REACHES THE MID ATLANTIC STATES...AND INCREASES SUN. AS STATED
ABOVE...WILL LEAVE SLGT CHC POPS FOR SAT NIGHT (WITH FRONT BECOMING
QUASISTNRY ACRS SRN INDIANA) THRU SUN NIGHT (AS WARM FRONT PASSES)
WITH AT LEAST MODERATE INSTABILITY IN PLACE TO TRIGGER ISOLD
TSTMS...MAINLY DIURNALLY DRIVEN. THEN FOR MON AND TUE...
AFOREMENTIONED QUASISTNRY BNDRY ACRS SRN INDIANA...SHUD GET A SWD
NUDGE AS A WAVE OF LOW PRES PASSES TO THE NE AND CANADIAN HI PRES
BUILDS IN FROM THE NW. IT APPEARS CONVECTION DURG THIS PERIOD SHUD
BE MOST WIDESPREAD (THOUGH STILL SCATTERED) WITH LOWER TEMPS AND
DEWPOINTS TUE/TUE NIGHT AFTER FROPA.

&&

.AVIATION (02/18Z TAFS)...

CUMULUS WILL DEVELOP THIS AFTERNOON...LEADING TO SCATTERED CLOUDS
WITH BASES ABOVE 4K FEET. SURFACE WINDS WILL STAY LIGHT FROM THE
SOUTHWEST UNDER 10 MPH THROUGH THIS EVENING.

LIGHT WINDS AND AMPLE INSTABILITY WILL LEAD TO ISOLATED SLOW MOVING
POP-UP THUNDERSTORMS DURING THE HEAT OF THE AFTERNOON AND EARLY
EVENING. AREAL COVERAGE OF THESE STORMS WILL BE 20% OR LESS AND
THERE ARE NO APPARENT BOUNDARIES OR FOCAL POINTS DICTATING JUST
WHERE INDIVIDUAL STORMS WILL DEVELOP. WILL PUT CB IN LOCAL TAFS TO
DENOTE TOWERING CU. ALTHOUGH THESE STORMS WILL BE ISOLATED...THEY
MAY CONTAIN STRONG WIND GUSTS.

COVERAGE OF ANY CONVECTION WILL DIMINISH BEFORE 02Z WITH THE LOSS OF
AFTERNOON HEATING. VFR CONDITIONS WITH PARTLY CLOUDY SKIES EXPECTED
OVERNIGHT.

A COLD FRONT NOW ACROSS INDIANA WILL SLOWLY SAG SOUTH OF THE OHIO
RIVER DURING THE AFTERNOON HOURS WEDNESDAY. WIDESPREAD
CLOUDINESS WILL LIKELY DEVELOP BY WEDNESDAY AFTERNOON WITH A CHANCE
OF CONVECTION BETWEEN 12 AND 18Z.

&&

.LMK WATCHES/WARNINGS/ADVISORIES...
KY...NONE.
IN...NONE.

SHORT TERM...JSD
LONG TERM....JK
AVIATION....JSD

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE LOUISVILLE KY
332 PM EDT TUE JUN 2 2009

INZ084-089>091-KYZ023>031-033>043-045>049-053>057-061>067-070>078-
081-082-031945-
CRAWFORD IN-PERRY IN-HARRISON IN-FLOYD IN-HANCOCK KY-
BRECKINRIDGE KY-MEADE KY-OHIO KY-GRAYSON KY-HARDIN KY-BULLITT KY-
JEFFERSON KY-OLDHAM KY-HENRY KY-SHELBY KY-FRANKLIN KY-SCOTT KY-
HARRISON KY-SPENCER KY-ANDERSON KY-WOODFORD KY-FAYETTE KY-
BOURBON KY-NICHOLAS KY-NELSON KY-WASHINGTON KY-MERCER KY-
JESSAMINE KY-CLARK KY-LARUE KY-MARION KY-BOYLE KY-GARRARD KY-
MADISON KY-BUTLER KY-EDMONSON KY-HART KY-GREEN KY-TAYLOR KY-
CASEY KY-LINCOLN KY-LOGAN KY-WARREN KY-SIMPSON KY-ALLEN KY-
BARREN KY-MONROE KY-METCALFE KY-ADAIR KY-RUSSELL KY-CUMBERLAND KY-
CLINTON KY-
332 PM EDT TUE JUN 2 2009 /232 PM CDT TUE JUN 2 2009/

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTH CENTRAL
INDIANA AND CENTRAL KENTUCKY.

.DAY ONE...THIS AFTERNOON AND TONIGHT.

SCATTERED STORMS WILL CONTINUE THROUGH MID-EVENING BEFORE
DIMINISHING BEFORE MIDNIGHT. SOME STORMS EARLY THIS EVENING MAY
PRODUCE SMALL HAIL...BRIEF GUSTY WINDS AND DANGEROUS LIGHTNING.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.

THUNDERSTORMS WILL BECOME MORE NUMEROUS LATE WEDNESDAY INTO
WEDNESDAY NIGHT AS A COLD FRONT SLOWLY MOVES SOUTHEAST ACROSS THE
REGION. THE STRONGEST STORMS WEDNESDAY AFTERNOON AND EVENING...MOST
LIKELY FROM SOUTH CENTRAL TO EAST CENTRAL KENTUCKY...MAY PRODUCE
MARBLE TO QUARTER SIZE HAIL AS WELL AS WIND GUSTS TO 50 MPH.

ADDITIONAL ISOLATED TO SCATTERED THUNDERSTORMS MAY DEVELOP SATURDAY
NIGHT THROUGH MONDAY AS THE NEXT SYSTEM COMES THROUGH.

.SPOTTER INFORMATION STATEMENT...

INZ076>079-083-092-KYZ032-031945-
ORANGE IN-WASHINGTON IN-SCOTT IN-JEFFERSON IN-DUBOIS IN-CLARK IN-
TRIMBLE KY-
332 PM EDT TUE JUN 2 2009 /232 PM CDT TUE JUN 2 2009/

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTH CENTRAL
INDIANA.

.DAY ONE...THIS AFTERNOON AND TONIGHT.

SCATTERED STORMS WILL CONTINUE THROUGH THE LATE EVENING HOURS.
SOME STORMS LATE THIS AFTERNOON OR EVENING MAY BE SEVERE WITH
DAMAGING WINDS AND HAIL UP TO THE SIZE OF QUARTERS. ANY
THUNDERSTORMS THAT DEVELOP MAY BRING LOCALLY HEAVY DOWNPOURS AND
DANGEROUS LIGHTNING.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.

THUNDERSTORMS WILL BECOME MORE NUMEROUS LATE WEDNESDAY INTO
WEDNESDAY NIGHT AS A COLD FRONT SLOWLY MOVES SOUTHEAST ACROSS THE
REGION. THE STRONGEST STORMS WEDNESDAY AFTERNOON AND EVENING...MOST
LIKELY FROM SOUTH CENTRAL TO EAST CENTRAL KENTUCKY...MAY PRODUCE
MARBLE TO QUARTER SIZE HAIL AS WELL AS WIND GUSTS TO 50 MPH.

ADDITIONAL ISOLATED TO SCATTERED THUNDERSTORMS MAY DEVELOP SATURDAY
NIGHT THROUGH MONDAY AS THE NEXT SYSTEM COMES THROUGH.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS ARE ENCOURAGED TO REPORT ANY DIME SIZED OR LARGER HAIL
OR STRONG WIND GUSTS TO THE NATIONAL WEATHER SERVICE.

JSD

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