Severe Thunderstorm Warning 165, NWS Louisville, KY

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LOUISVILLE KY
317 PM EDT FRI JUL 27 2007

.SHORT TERM (TONIGHT AND SATURDAY)...

...SEVERE THUNDERSTORM WATCH IN EFFECT UNTIL 02Z...

STRONG SHORTWAVE DIVING DOWN FROM THE CHICAGO-LAND AREA HAS SPARKED
SHOWERS AND STORMS ACROSS THE AREA (MCV VISIBLE IN REFLECTIVITY OVER
CENTRAL IL). GIVEN MODERATE INSTABILITY AND GOOD DEEP-LAYER SHEAR
(30 KTS FROM RECENT SDF ACARS SOUNDING AND AREA VWPS)...MARGINALLY
SEVERE STORMS ARE POSSIBLE WITH DAMAGING WINDS AND LARGE HAIL BEING
THE MAIN THREATS. THINK WIND RATHER THAN HAIL IS POSSIBLE GIVEN HIGH
FREEZING AND WET-BULB HEIGHTS. WILL LIKELY BE ABLE TO CANCEL TIERS
OF COUNTIES FROM NORTH TO SOUTH WITHIN THE WATCH AREA STARTING AT 6PM
EDT OR SO.

SHOWERS AND THUNDERSTORMS WILL LIKELY DIMINISH IN STRENGTH GREATLY
AFTER 10 PM EDT...THOUGH STEADY RAIN WITH A FEW EMBEDDED STORMS ARE
POSSIBLE THROUGHOUT THE OVERNIGHT HOURS. TRIMMED BACK POPS AFTER
MIDNIGHT AS A RESULT...BUT STILL HAVE SLT TO LOW CHC POPS TOWARD
MORNING. GIVEN AMPLE CLOUDS AND PRECIP...WENT ABOVE GUIDANCE FOR
OVERNIGHT LOWS. AFTER MIDNIGHT...IT WILL LIKELY BECOME MORE OF AN
AVIATION CONCERN...WITH MVFR/IFR CIGS AND VSBYS POSSIBLE. HAVE
HINTED AT THIS IN THE TAFS ALREADY...AND MAY MENTION FOG OVERNIGHT
TOWARD SAT MORN IN THE GRIDS/ZONES.

TRAILING SYNOPTIC COOL FRONT WILL BE LOCATED NEAR THE OHIO RIVER BY
12Z SATURDAY. KEPT SLT CHC POPS IN FAR NRN CWA UNTIL 18Z SAT...WITH
CHC POPS ELSEWHERE UNTIL 00Z SUN (HIGHEST POPS SOUTH UNTIL FRONT
REACHES TN BORDER SATURDAY NIGHT). AM NOT EXPECTING SEVERE STORMS
AT THIS TIME AS I FEEL MOST OF THE INSTABILITY WILL REMAIN SOUTH
OF THE CWA. HAVE LOW 80S FOR HIGHS TOMORROW EVERYWHERE EXCEPT
MID/UPPER 80S CLOSE TO TN BORDER.

AL

.LONG TERM (SATURDAY NIGHT THROUGH FRIDAY)...

MAIN FORECAST CONCERNS FOR THE LONGER TERM WILL BE HOW FAST THE
CLOUDS WILL DECREASE AFTER THE FRONT PUSHES THROUGH AND WILL ANY
SHOWERS DEVELOP BEHIND THE FRONT ON SUNDAY.

A TROUGH WILL PERSIST ALONG THE APPALACHIAN MOUNTAINS WITH A LARGE
RIDGE SITTING OVER THE WEST HALF OF THE NATION THROUGH MUCH OF THE
LONGER TERM PERIOD. BY THE END OF THE PERIOD THE TROUGH WEAKENS AND
MOVES EAST AND THE UPPER RIDGE BECOMES BROADER AND EXTENDS EAST INTO
THE LOWER OHIO VALLEY.

GFS IS CONSISTENT WITH GFS ENSEMBLE...ECMWF AND UKMET AND WILL
GENERALLY FOLLOW THE MODEL CONSENSUS.

SATURDAY NIGHT THROUGH MONDAY NIGHT...
THE COLD FRONT WILL EXIT THE REGION BY SATURDAY EVENING TAKING THE
PRECIPITATION WITH IT. HOWEVER CLOUDS WILL LINGER OVER THE AREA
SATURDAY NIGHT AND SUNDAY THEN DECREASE FROM THE NORTH SUNDAY NIGHT.
A FEW SPRINKLES OR AN ISOLATED SHOWER COULD DEVELOP ACROSS OUR FAR
SOUTHERN AND EASTERN COUNTIES DURING THE DAY SUNDAY...BUT FOR NOW
WILL LEAVE ANY MENTION OF SPRINKLES OUT. BY MONDAY CLOUDS WILL
PERSIST ONLY OVER THE FAR SOUTHERN AND EASTERN PARTS OF THE LMK
FORECAST AREA.

HIGH TEMPERATURES WILL BE IN THE UPPER 80S BOTH SUNDAY AND MONDAY.

TUESDAY THROUGH FRIDAY...
HIGH PRESSURE WILL BUILD INTO THE LOWER OHIO VALLEY TUESDAY. AT THE
SAME TIME THE UPPER TROUGH WILL BE WEAKENING AND MOVING TO THE
NORTHEAST. THIS WILL ALLOW HIGH PRESSURE TO SETTLE OVER THE OHIO
VALLEY THROUGH THE REST OF THE WEEK. SKIES WILL STAY MOSTLY SUNNY
DURING THE DAY AND MOSTLY CLEAR AT NIGHT. THERE WILL BE SOME
INCREASE IN CLOUDS BY THE END OF THE WEEK BUT SUNSHINE WILL STILL
BE DOMINANT DURING THE DAYTIME. TEMPERATURES WILL STAY QUITE WARM
WITH HIGHS AROUND 90 AND LOWS IN THE MID AND UPPER 60S THROUGH THE
END OF THE WEEK.

SCHOLZ

&&

.AVIATION (FOR 18Z TAFS)...

FAIRLY STRONG UPPER-AIR DISTURBANCE OVER CHICAGO IS GENERATING A
BATCH OF RAIN WITH EMBEDDED THUNDERSTORMS OVER CENTRAL IL/IN. CIGS
WITHIN THIS AREA ARE GENERALLY IN THE LOW MVFR RANGE...WITH SOME
AREAS SEEING DOWN TO LOW IFR CIGS AND IFR VSBYS FROM RA/BR. WILL TRY
AND BEST TIME THIS IN AREA TAFS.

AHEAD OF THIS PRECIP...WILL KEEP THE STEADY RAIN MORE ON THE MVFR
SIDE OF THINGS AFTER 19Z AT SDF AND AFTER 20Z AT LEX. THINK THIS
STEADY RAIN WILL BE NORTH OF THE BWG TAF SITE...AT WHICH POINT MORE
OF AN ISLD-SCT T-STORM WOULD OCCUR OVER SRN KY. WILL HAVE MORE OF A
VICINITY WORDING IN BWG UNTIL AFTER MIDNIGHT...AND THEN MAY
INTRODUCE A PREVAILING RAIN GROUP.

OTHERWISE...WITH AMPLE MOISTURE COULD HAVE BR AND MVFR-IFR VSBYS
OVERNIGHT TOWARD SAT MORN. BL WINDS MAY BE BORDER-LINE LLWS CRITERIA
AT BWG BETWEEN 06-12Z WITH 925MB WESTERLY WINDS OF 30 KTS...BUT WILL
LEAVE THIS OUT FOR NOW AND SEE HOW THINGS PROGRESS.

AL

&&

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

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE LOUISVILLE KY
340 PM EDT FRI JUL 27 2007

INZ076>079-083-084-089>092-KYZ023>043-045>049-053>057-061>067-
070>078-081-082-280830-
ORANGE IN-WASHINGTON IN-SCOTT IN-JEFFERSON IN-DUBOIS IN-
CRAWFORD IN-PERRY IN-HARRISON IN-FLOYD IN-CLARK IN-HANCOCK KY-
BRECKINRIDGE KY-MEADE KY-OHIO KY-GRAYSON KY-HARDIN KY-BULLITT KY-
JEFFERSON KY-OLDHAM KY-TRIMBLE 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-
340 PM EDT FRI JUL 27 2007 /240 PM CDT FRI JUL 27 2007/

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

.DAY ONE...THIS EVENING AND TONIGHT.

A STRONG UPPER-LEVEL DISTURBANCE HAS GENERATED STRONG TO SEVERE
THUNDERSTORMS ACROSS FAR SOUTHERN INDIANA AND ALL OF CENTRAL
KENTUCKY...WHERE A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 10
PM EDT.

THE BEST CHANCE FOR SEVERE STORMS WILL BE FOUND SOUTH OF THE OHIO
RIVER...MAINLY SOUTHEAST OF A LINE FROM HARDINSBURG...TO
BARDSTOWN...AND TO FRANKFORT. THE MAIN WEATHER THREATS WILL BE
DAMAGING WINDS OF 60 MPH AND HAIL UP TO THE SIZE OF QUARTERS.
VERY HEAVY RAINFALL AND DANGEROUS LIGHTNING WILL ACCOMPANY ALL
STORMS.

THE THUNDERSTORMS WILL DIMINISH IN STRENGTH AFTER 10 PM EDT
TONIGHT...THOUGH A FEW THUNDERSTORMS WILL BE POSSIBLE OVERNIGHT.
ANY THREATS WITH THESE OVERNIGHT STORMS WILL BE HEAVY RAINFALL AND
LIGHTNING. PATCHY FOG MAY DEVELOP AFTER MIDNIGHT TOWARD THE EARLY
MORNING HOURS...WITH THE BEST CHANCE ACROSS SOUTHERN INDIANA AND
FAR NORTHERN KENTUCKY.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.

THUNDERSTORMS WILL BE POSSIBLE SATURDAY ALONG AND AHEAD OF AN
APPROACHING COOL FRONT. THE BEST CHANCE FOR THUNDERSTORMS WILL BE
ACROSS CENTRAL AND SOUTH-CENTRAL KENTUCKY...WHERE STORMS WILL BE
CAPABLE OF PRODUCING HEAVY RAINFALL...LIGHTNING AND GUSTY WINDS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS REQUESTED THROUGH THIS EVENING. PLEASE
REPORT ANY INSTANCES OF DAMAGING WINDS OR LARGE HAIL TO LOCAL LAW
ENFORCEMENT OR THE NATIONAL WEATHER SERVICE IN LOUISVILLE
KENTUCKY.

AL/MBS

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LOUISVILLE KY
425 PM EDT FRI JUL 27 2007

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0420 PM     HAIL             CAMPBELLSVILLE          37.35N 85.35W
07/27/2007  M0.88 INCH       TAYLOR             KY   LAW ENFORCEMENT

&&

AL

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LOUISVILLE KY
426 PM EDT FRI JUL 27 2007

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0418 PM     TSTM WND DMG     CAMPBELLSVILLE          37.35N 85.35W
07/27/2007                   TAYLOR             KY   LAW ENFORCEMENT

            FOUR TREES DOWN.

&&

AL

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE LOUISVILLE KY
429 PM EDT FRI JUL 27 2007

KYZ041-272115-
FAYETTE-
429 PM EDT FRI JUL 27 2007

...STRONG THUNDERSTORMS APPROACHING FAYETTE COUNTY...

AT 425 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 5 MILES SOUTHEAST OF VERSAILLES...OR 10 MILES
WEST OF LEXINGTON...AND MOVING EAST AT 20 MPH. ANOTHER STRONG
THUNDERSTORM WAS MOVING EAST INTO JESSAMINE COUNTY...AND MAY AFFECT
FAR SOUTHERN FAYETTE COUNTY.

FREQUENT DEADLY LIGHTNING...HEAVY RAIN WITH RAINFALL AMOUNTS OF
AROUND ONE INCH PER HOUR REDUCING VISIBILITIES TO LESS THAN ONE
MILE...SMALL PEA OR MARBLE SIZE HAIL...AND STRONG GUSTY WINDS OF
AROUND 45 TO 50 MPH...ARE EXPECTED WITH BOTH STORMS.

THE STORMS WILL AFFECT THE LEXINGTON METRO AREA...SO USE CAUTION
DURING THE EVENING RUSH HOUR.

IF YOU ARE IN THE PATH OF THESE STORMS...SEEK SHELTER INDOORS AND
STAY AWAY FROM WINDOWS. STAY TUNED TO NOAA ALL HAZARDS RADIO...
WEATHER.GOV/LOUISVILLE ON THE INTERNET...OR LOCAL MEDIA FOR LATER
UPDATES AND POSSIBLE WARNINGS.

AL

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