Area Forecast Discussion
Issued by NWS Jackson, KY

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000
FXUS63 KJKL 250811
AFDJKL

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE JACKSON KY
411 AM EDT SAT APR 25 2015

.SHORT TERM...(TODAY THROUGH SUNDAY)
ISSUED AT 411 AM EDT SAT APR 25 2015

AN ACTIVE PERIOD IS IN STORE...WITH EVENTS JUST BEGINNING TO
UNFOLD. AN AREA OF SHOWERS IS EXPECTED TO DEVELOP AND MOVE NE OVER
THE REGION THIS MORNING. HOWEVER...IT IS BEHIND SCHEDULE AS BASED
ON THE 00Z MODELS...WITH A CONVECTIVE SYSTEM OVER MS AND AL
POSSIBLY FOILING THE OUTCOME. THE LATEST HRRR MODEL SUGGESTS IT
WILL STILL HAPPEN...BUT MAY BE MORE FOCUSED ON OUR NORTHERN
COUNTIES.

ONCE THIS PASSES...IT WILL BE A WAITING GAME FOR ADDITIONAL
CONVECTION TO DEVELOP DURING THE AFTERNOON AND EVENING AS A STORM
SYSTEM APPROACHES FROM THE WEST...ALONG A FRONTAL BOUNDARY DRAPED
ACROSS OUR AREA. IT STILL APPEARS THERE WILL BE LARGE SURFACE
BASED INSTABILITY PRESENT IN OUR SOUTHWEST COUNTIES...WITH WEAKER
AND MORE ELEVATED INSTABILITY FURTHER NORTHEAST. SHEAR WILL BE
MORE THAN SUFFICIENT TO SUPPORT ORGANIZED CONVECTION. DRY MID
LEVEL AIR IS ALSO EXPECTED IN OUR SW. THIS WILL PRESENT A THREAT
OF SEVERE WEATHER OVER OUR SW...WITH SUPER CELLS POSSIBLY
PRODUCING LARGE HAIL AND HIGH WINDS...AND A SECONDARY THREAT OF
TORNADOES. EXCESSIVE RAINFALL IS ALSO A CONCERN WITH TRAINING OF
CELLS ALONG THE FRONTAL BOUNDARY. WHERE THIS MAY SET UP IS STILL
UNCERTAIN. ANY HYDRO PROBLEMS LIKELY WOULD NOT ARISE UNTIL THIS
EVENING...AND HAVE OPTED TO LET DAY SHIFT EXAMINE THE 12Z RUN
BEFORE MAKING A DECISION ON A FFA.

THE FRONTAL BOUNDARY WILL MOVE TO OUR SOUTH AS LOW PRESSURE MOVES
EAST THROUGH THE REGION TONIGHT. ANY LINGERING SHOWERS WILL END ON
SUNDAY MORNING AND CLOUDS WILL BREAK UP DURING THE DAY FROM NW TO
SE AS DRY AIR MOVES IN.

.LONG TERM...(SUNDAY NIGHT THROUGH FRIDAY)
ISSUED AT 335 AM EDT SAT APR 25 2015

THE MODELS WERE IN GOOD AGREEMENT IN THE EXTENDED. THE PERIOD IS
SET TO BEGIN WITH A LARGE RIDGE OF HIGH PRESSURE MOVE OUT OF THE
NORTH CENTRAL PLAINS AND ACROSS THE LOWER GREAT LAKES AND OHIO AND
TENNESSEE VALLEY REGIONS SUNDAY NIGHT THROUGH TUESDAY. THE PATTERN
IS THEN FORECAST TO CHANGE TUESDAY NIGHT AND WEDNESDAY...AS BOTH
NORTHERN AND SOUTHERN STREAM WEATHER SYSTEMS MAKE THEIR WAY ACROSS
THE GREAT LAKES AND GULF COAST REGIONS. THE SOUTHERN STREAM SYSTEM
APPEARS TO BE THE STRONGER OF THE TWO...AND THEREFORE WOULD HAVE
TO GREATER INFLUENCE ON AREA WEATHER MID WEEK. AS IT STANDS...A
ROUGHLY 60 40 BLEND OF THE ECMWF AND GFS MODELS WAS USED TO CREATE
THE FORECAST FROM TUESDAY NIGHT ONWARD. THE SOUTHERN STREAM
TROUGH IS PROGGED TO BRING MOISTURE OFF THE GULF OF MEXICO
NORTHWARD INTO CENTRAL AND EASTERN KENTUCKY WEDNESDAY AND
WEDNESDAY NIGHT. AS THIS OCCURS...THE NORTHERN STREAM SYSTEM IS
FORECAST TO DIVE SOUTHWARD AND PHASE WITH THE TENNESSEE VALLEY
SOUTHEASTERN CONUS LOW. THE GFS DOES DIFFER SLIGHTLY FROM THE
ECMWF MODEL DURING THIS PERIOD...AS ITS NORTHERN STREAM LOW PUSHES
ON EASTWARD INTO NEW ENGLAND...AS OPPOSED TO PHASING WITH THE
SOUTHERN SYSTEM...AS THE ECMWF IS DEPICTING. THAT BEING
SAID...THIS IS WHERE THE USUALLY MORE CONSISTENT ECMWF MODEL
SOLUTION WAS FAVORED. THERE WILL BE A CHANCE OF RAIN IN THE
FORECAST FOR THE ENTIRE AREA FROM LATE TUESDAY NIGHT THROUGH
THURSDAY NIGHT. HOWEVER...DUE TO THE DIFFERING MODEL
SOLUTIONS...DECIDED TO STAY WITH SLIGHT CHANCE TO CHANCE
POPS...WITH 40 BEING THE HIGH END DURING THE WET PERIOD. FRIDAY
AND FRIDAY NIGHT LOOK TO BE DRY AS THE SOUTHERN STREAM WEATHER
SYSTEM EXITS TO OUR EAST AND ANOTHER RIDGE OF HIGH PRESSURE BUILDS
ACROSS THE SOUTHERN AND SOUTHEASTERN CONUS.

TEMPERATURES NEXT WEEK WILL LIKELY BE BELOW NORMAL THROUGH
THURSDAY...DUE TO THE INFLUENCE OF CLOUD COVER AND PRECIPITATION
AND THE FACT THAT THIS WEEKENDS TEMPERATURES WILL ALSO REMAIN WELL
BELOW NORMAL DUE WIDESPREAD CLOUD COVER AND PRECIPITATION. WHAT
THIS AMOUNTS TO IS THE ATMOSPHERE WILL STARTING OFF BEHIND THE
EIGHT BALL TO START THE WEEK TEMPERATURE WISE...MAKING IT
DIFFICULT FOR THINGS TO WARM UP AS MUCH AS NORMAL DUE TO THE SHORT
BREAK BETWEEN WEATHER SYSTEMS. HIGHS ON FRIDAY SHOULD BE RIGHT
AROUND NORMAL ACROSS THE ENTIRE AREA.

&&

.AVIATION...(FOR THE 06Z TAFS THROUGH 06Z SATURDAY NIGHT)
ISSUED AT 202 AM EDT SAT APR 25 2015

VFR CONDITIONS WERE PRESENT AT TAF ISSUANCE...BUT WILL DEGRADE TO
MVFR FROM SW TO NE BETWEEN ABOUT 06Z AND 14Z AS RAIN DEVELOPS. IFR
IS ALSO EXPECTED AT TIMES THROUGH EARLY AFTERNOON. STEADY
PRECIPITATION WILL TAPER OFF FROM SW TO NE DURING THE LATE MORNING
AND EARLY AFTERNOON...AND WILL BE REPLACED BY SCATTERED SHOWERS
AND THUNDERSTORMS. THEY WILL BECOME MORE NUMEROUS LATE IN THE DAY
AND THIS EVENING. SOME LOCATIONS MAY DESCEND BACK TO IFR WITH THE
SHOWERS AND STORMS THIS EVENING. SOME OF THESE STORMS COULD
PRODUCE HAIL AND HIGH WINDS.


&&

.JKL WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

$$

SHORT TERM...HAL
LONG TERM...AR
AVIATION...HAL



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