Severe Thunderstorm Warning 93, NWS Jackson, KY

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE JACKSON KY
445 PM EDT TUE MAY 27 2003

19Z SFC ANALYSIS SHOWS PERSISTENT LOW PRESSURE OVER THE NORTHEAST
AND ANOTHER CENTER DEVELOPING ALONG THE CAROLINA COAST. HIGH
PRESSURE IS FOUND WELL TO THE SOUTHWEST OVER THE SOUTHERN PLAINS.
RADAR IS SHOWING STRONG DIURNAL AND VORTICITY DRIVEN THUNDERSTORMS
EXITING FAR SOUTHEAST KENTUCKY AS MORE WIDELY SCATTERED SHOWERS AND
THUNDERSTORMS RELOAD FROM THE NORTH. THE CONVECTION IS EASY TO SPOT
ON SATELLITE AMONGST THE CLEAR PATCHES AND SHOULD DIE OFF SOMEWHAT
WITH SUNSET.

THE MODELS ARE IN EXCELLENT AGREEMENT THROUGH 48 HOURS WITH THE
EVOLUTION OF THE UPPER LOW AS IT SPINS EAST INTO NEW ENGLAND. EVEN
AFTER IT HAS MOVED AWAY A DEEP TROUGH WILL REMAIN OVER THE CENTRAL
APPALACHIANS. ANY RIDGING THAT SNEAKS INTO KENTUCKY IN ITS WAKE WILL
BE SHORT LIVED AS THE GFS QUICKLY BRINGS ANOTHER SHORTWAVE SOUTH
FROM CANADA TO REFORM A DEEP LOW OVER THE GREAT LAKES. THE ETA IS
SLOWER WITH THIS DEVELOPMENT...ON FRIDAY...RUNNING ABOUT 12 HOURS
BEHIND THE GFS. WILL GO WITH A BLEND FOR NOW...BUT THE TREND IS
DEFINITELY FAVORING THE LATEST GFS SOLUTION. THIS RENEWED...AND
DEEPER UPPER LOW WILL THEN PLAGUE THE OHIO VALLEY THROUGH THE FIRST
PART OF NEXT WEEK IF THE 06Z AND 12Z GFS PAN OUT.

SENSIBLE WEATHER WILL FEATURE EVENING THUNDERSTORMS DYING OFF WITH
SUNSET BUT A SMALL CHANCE OF SHOWERS REMAINING INTO WEDNESDAY
MORNING. AGAIN EXPECT AREAS OF FOG TO DEVELOP AFTER MIDNIGHT IN
LOCATIONS THAT SAW RAIN TODAY AND STAY PARTLY CLOUDY TONIGHT.
ANOTHER VORT WILL DROP THROUGH KENTUCKY WEDNESDAY AFTERNOON WITH
A RISK OF SHOWERS AND THUNDERSTORMS. AGAIN THESE STORMS COULD
BECOME HAILERS PRETTY QUICKLY WITH THE LOW WETBULB ZERO IN PLACE
THROUGH THURSDAY. A BIGGER SHORTWAVE WILL DIVE DOWN WEDNESDAY NIGHT
CREATING A NEW SFC LOW OVER THE LOWER OHIO VALLEY THAT WILL SLOWLY
ROTATE THROUGH THE CENTRAL APPALACHIANS DURING THE DAY THURSDAY...
MAKING SHOWERS AND THUNDERSTORMS A GOOD BET. WHILE THE UPPER LEVELS
ARE DIFFERENT THE SFC FEATURES OF THE ETA AND GFS ARE SIMILAR AT 84
HOURS WITH ANOTHER LOW AND COLD FRONT HEADING FOR KENTUCKY. THE OLD
GFS IMPLIED THAT THIS FRONT GOES THROUGH DURING THE DAY SATURDAY
WHILE THE 12Z IS NOW SHOWING FRIDAY NIGHT. WILL HALF STEP TOWARD THE
NEW SOLUTION. EITHER WAY COOLER...POSSIBLY MUCH COOLER...WEATHER
WILL FOLLOW FOR SUNDAY AND MONDAY.

MOS TEMPERATURES ARE GENERALLY SIMILAR THROUGH THE PERIOD...DID NOT
STRAY TOO FAR. HAD TO CARRY LOW POPS INTO THE NIGHT WITH ANOTHER
LITTLE SHORTWAVE PASSING THROUGH. ALSO PUT LOW POPS IN WEDNESDAY
AFTERNOON WITH THE HEAT OF THE DAY AHEAD OF THE NEXT...LARGER WAVE.
LIKELY POPS NORTH AND HIGH CHANCE SOUTH FOR WEDNESDAY NIGHT INTO
FRIDAY WITH THIS.

IFPS/GFE...PERFORMED THE USUAL POPULATION AND ADJUSTMENT OF THE TEMP
...DEW POINT AND WIND GRIDS THROUGH 60 HOURS FROM THE MESOETA. THE
REST WAS IN PRETTY GOOD SHAPE...STILL SOME UNCERTAINTY ABOUT THE
FRONT FOR FRIDAY NIGHT INTO SATURDAY...TRIED TO BLEND THE 00Z AND
12Z GFS AS BEST I COULD WHILE MATCHING WITH ISC OFFICES.

TEXT PRODUCTS AND GRAPHICS ALREADY OUT.

PRELIMINARY CCF NUMBERS:
LOZ 051/076 057/070 056 215
JKL 050/075 058/068 055 325

.JKL...NONE.

GREIF

PREVIOUS DISCUSSIONS FOLLOW:
=====================================================================

1055 AM EDT TUE MAY 27 2003

LATEST SAT/RADAR PICS SHOWING SCATTERED SHOWERS ACROSS NORTHERN
KENTUCKY HEADING SOUTHEAST...AHEAD OF MID LEVEL WAVE.  12Z MODELS
TAKE THIS FEATURE THROUGH OUR CWA LATER THIS AFTERNOON.  WILL GO
AHEAD AND BUMP UP POPS TO ACCOUNT FOR THIS ACTIVITY.  WITH STEEP MID
LEVEL LAPSE RATES...THUNDER A DEFINITE POSSIBILITY.  IN
ADDITION...LOW FREEZING LEVELS PER AREA UA SOUNDINGS THIS
MORNING...SUGGEST A THREAT OF HAIL WITH ANY STRONG STORMS.  THOUGH
THAT APPEARS ISOLATED AT BEST.  QUICK LOOK AT TEMP GRIDS SHOWING
SOME MAJOR WORK NEEDS TO BE DONE WITH THE HOURLYS AS CURRENT DATA
SET IS WAY TOO COOL.

NEW GRIDS AND TEXT PRODUCTS OUT BY 1130 AM.

JARVIS

=====================================================================

450 AM EDT TUE MAY 27 2003

CURRENT SFC MAP FEATURES WEAK HIGH PRESSURE SW OF THE G.L. WITH LOW
PRESSURE ALONG FRONTAL BOUNDARY DANGLING FROM NC SW TO THE FL
PANHANDLE. INVERTED TROUGH CONTINUES TO HOLD ALONG THE APPS. SAT
PICS SHOWING 5H LOW SPINNING ITS WHEELS OVER THE G.L. VIS GOING
DOWN IN PLACES WITH LOW CLOUDS STARTING TO BECOME DETECTABLE.AS WELL
AS A BKN MID LVL DECK. FEEL THAT MOSTLY CLOUDY WILL DO TODAY AS BY
THE TIME LOW AND MID LEVEL DECK FADE...STRATOCU SHOULD FILL IN...AS
INDICATED BY MODEL SOUNDINGS. STILL HAVE LEFT A 20 POP IN FOR ANY
INSTABILITY BUILD UPS. HAVE TWEAKED HIGHS DOWN A TAD TO ACCOUNT FOR
CLOUD COVER. DRIER AIR WORKS IN TONIGHT...ALLOWING FOR AT LEAST A
PARTLY SUNNY WEDNESDAY. NEXT WEATHER MAKER OCCURS WHEN 5H LOW SPINS
EASTWARD WITH A DIGGING S/WV ON THE BACKSIDE. THIS HELPS DEEPEN A
LOW PRESSURE SYSTEM...WHICH WILL TRACK IN THE VICINITY OF THE CWA.
ETA CONTINUES THE SLOWER SOLUTION. HAVE CHOSEN A MIDDLE GROUND WITH
PRECIP MOVING IN FROM THE NORTHWEST BY AROUND 0Z FOR THE FAR
NORTHWEST. QPF TRENDS HAVE BEEN ON THE INCREASE...BUT NOT SURE ON
HEAVY PRECIP AS NATIONAL GUIDANCE HAS INDICATED. DESPITE DECENT
DYNAMICS...GULF CONTINUES TO BE CUT OFF. HOPEFULLY...LATER RUNS WILL
ELUDE TO MORE SUPPORT. HAVE COOLED TEMPS DOWN ON THURSDAY WITH
PRECIP AND CLOUD COVER AROUND. WARMING TREND BEGINS FRIDAY...AND
THEN ENDS SATURDAY AS NEXT S/WV SWINGS DOWN FROM BEEFY CANADIAN 5H
LOW.

GEOGERIAN

KYZ044-050>052-058>060-068-069-079-080-083>088-104-106>120-281100-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE JACKSON KY
1205 PM EDT TUE MAY 27 2003

THIS HAZARDOUS WEATHER OUTLOOK IS FOR EASTERN KENTUCKY.

.DAY ONE...THIS AFTERNOON AND TONIGHT.

AN UPPER LEVEL DISTURBANCE WILL MOVE ACROSS PORTIONS OF THE OUTLOOK
AREA THIS AFTERNOON.  THE COMBINATION OF AFTERNOON HEATING AND THIS
DISTURBANCE WILL PRODUCE SCATTERED SHOWERS AND THUNDERSTORMS ACROSS
EASTERN KENTUCKY THIS AFTERNOON AND EVENING.  HEAVY RAINS...GUSTY
WINDS...DANGEROUS LIGHTNING AND SMALL HAIL WILL BE POSSIBLE WITH THE
STRONGER STORMS.

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

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE REQUESTED THIS AFTERNOON.

JARVIS