Area Forecast Discussion
Issued by NWS Jackson, KY

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000
FXUS63 KJKL 210247
AFDJKL

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE JACKSON KY
1047 PM EDT SUN APR 20 2014

.UPDATE...
ISSUED AT 1041 PM EDT SUN APR 20 2014

WHILE MANY LOCATIONS ARE STARTING TO RECOVER FROM THE LOW RH/S EARLIER
IN THE AFTERNOON...THERE ARE STILL A FEW LOCATIONS...INCLUDING WEST
LIBERTY...WHICH ARE EXPERIENCING DEW POINTS IN THE LOWER 20S WITH RH
VALUES IN THE TEENS. LOADED IN THE LATEST OBSERVATIONAL GUIDANCE FOR
TEMPS...DEW POINTS...AND WINDS...TO BETTER PICK UP ON THE ONGOING
CONDITIONS. EXPECT THE LOW RH LOCATIONS TO CONTINUE TO RECOVER AND
MIX OVER THE NEXT FEW HOURS. OTHERWISE...FORECAST SEEMS TO BE WELL ON
TRACK FOR A FAIRLY QUIET NIGHT AND BEGINNING TO THE DAY MONDAY.

&&

.SHORT TERM...(THIS EVENING THROUGH MONDAY NIGHT)
ISSUED AT 400 PM EDT SUN APR 20 2014

A RIDGE OF HIGH PRESSURE EXTENDED FROM THE GULF OF MEXICO NORTH AND
NORTHEAST INTO THE TN AND OH VALLEYS. AT THE SFC...A RIDGE OF HIGH
PRESSURE EXTENDED FROM THE THE NORTHEASTERN US INTO THE LOWER MS
VALLEY. MEANWHILE...A CLOSED UPPER LEVEL LOW WAS LOCATED OFF THE
SOUTHEASTERN US COAST WHILE ANOTHER TROUGH WAS OVER THE SOUTHERN
ROCKIES INTO THE SOUTHERN PLAINS WHILE ANOTHER SHORTWAVE WAS MOVING
ACROSS THE NORTHERN ROCKIES TOWARD THE DAKOTAS.

TONIGHT AND INTO MONDAY...THE UPPER LEVEL LOW OFF THE SOUTHEASTERN US
COAST WILL DEPART TO THE EAST WHILE THE UPPER LEVEL RIDGE WILL ALSO
SHIFT TO THE EASTERN SEABOARD. DURING THIS TIME...A SFC LOW WILL
ORGANIZE OVER THE CENTRAL PLAINS AND TRACK INTO THE NORTHERN GREAT
LAKES BY MON EVENING AND SEND A COLD FRONT INTO THE MS VALLEY.
THE SFC RIDGE WILL ALSO SHIFT TO THE EASTERN SEABOARD BY MONDAY
EVENING. A RIDGE/VALLEY SPLIT IS EXPECTED TONIGHT WITH EASTERN VALLEY
LOCATIONS LIKELY A COUPLE OF DEGREES WARMER THAN THIS MORNING. SOME
UPPER 30S ARE POSSIBLE IN THE NORMALLY COLDEST SPOTS WHILE MANY
RIDGETOPS WILL REMAIN IN THE 50S. TEMPERATURES WILL MODERATE A BIT
FURTHER FROM TODAY ON MONDAY IN ADVANCE OF THE NEXT COLD FRONT...TO THE
UPPER 70S TO SOME LOWER 80S IN SOME OF THE DEEPER VALLEY LOCATIONS.

THE TROUGH NOW ENTERING THE PLAINS WILL MOVE INTO THE MS VALLEY ON
MONDAY AND THEN WORK WORK ACROSS THE OHIO VALLEY REGION ON MONDAY
EVENING INTO TUESDAY. THE SFC LOW WILL TRACK FROM THE NORTHERN GREAT
LAKES TO THE NORTHEASTERN CONUS FROM MONDAY EVENING INTO TUESDAY
EVENING AND SEND A COLD FRONT ACROSS THE COMMONWEALTH. ANOTHER UPPER
LEVEL RIDGE WILL BEGIN TO BUILD TOWARD THE REGION LATE IN THE PERIOD.
THE COLD FRONT WILL BE RATHER QUICK MOVING...BUT THE TROUGH IS
EXPECTED TO DEEPEN A BIT AS IT MOVES ACROSS THE OH VALLEY LEADING TO
AN INCREASED CONFIDENCE IN MEASURABLE RAINFALL. HOWEVER...RAINFALL
WILL BE LIGHT AROUND A QUARTER OF AN INCH OR LESS. MOISTURE WILL BE
SOMEWHAT SLOW TO INCREASE IN THE LOWEST LEVELS AND THERE WILL NEED TO
BE QUITE A BIT OF RECOVERY BEHIND THE DEPARTING SFC HIGH. IN
FACT...HUMIDITIES ON MONDAY SHOULD BE DOWN TO 30 PERCENT OR LOWER IN
MOST LOCATIONS WITH HUMIDITIES BELOW 25 PERCENT ACROSS PARTS OF THE
BIG SANDY REGION. WHILE THERE WILL BE SOME MOISTENING FROM THE TOP
DOWN. AS THE TROUGH DEEPENS...INSTABILITY MAY BE SUFFICIENT FOR A
FEW STRAY THUNDERSTORMS MONDAY NIGHT AND TUESDAY MORNING. THE THREAT
FOR PRECIPITATION WILL END FROM WEST TO EAST FROM MID MORNING ON
TUESDAY INTO TUESDAY AFTERNOON AS THE COLD FRONT EXITS.

.LONG TERM...(TUESDAY THROUGH SUNDAY)
ISSUED AT 338 PM EDT SUN APR 20 2014

WELL THE EXTENDED FORECAST PERIOD WILL FEATURE A PROGRESSIVE UPPER
LEVEL PATTERN. THERE WILL BE SUCCESSIVE SHORTWAVE TROUGHS FOLLOWED
BY SOME SHORTWAVE RIDGES. BY THE END OF THE EXTENDED PERIOD ON MONDAY
AND TUESDAY...A RATHER STRONG SHORTWAVE SETS UP OVER THE UPPER MS
RIVER VALLEY MOVING INTO THE OH VALLEY BY TUESDAY.

MAINLY A DRY LOOK TO THE EXTENDED LOOKS TO BE THE CASE WITH THE
WAVES MOVING THROUGH PRODUCING LITTLE RAINFALL BUT WITH THE MODELS
NOT HANDLING THE PATTERN AS WELL...WILL SHOW LITTLE CONFIDENCE AND
STAY CLOSE TO THE ALL MODEL BLEND SOLUTION. THE WAVE MOVING THROUGH
ON FRIDAY WILL LEAVE A STATIONARY BOUNDARY AT THE SURFACE OVER THE
TN AND KY BORDER AND THE LAST FEW DAYS OF THE EXTENDED LOOKING
RATHER MOIST. THE AFOREMENTIONED POTENT SHORTWAVE ON MONDAY AND
TUESDAY WILL ALLOW A SURFACE LOW TO STRENGTHEN OVER THE MIDWEST AS A
WARM FRONT MOVES NORTH LATE MONDAY AND THE COLD FRONT MOVES THROUGH
ON TUESDAY. HAVE PUT THUNDER IN FOR THIS SET UP AS WELL...AS THE
POTENTIAL IS PRESENT FOR A FEW STRONG STORMS.

&&

.AVIATION...(FOR THE 00Z TAFS THROUGH 00Z MONDAY EVENING)
ISSUED AT 710 PM EDT SUN APR 20 2014

VFR CONDITIONS WILL CONTINUE OVER EAST KENTUCKY THROUGH THE FORECAST
PERIOD AS HIGH PRESSURE BEGINS TO DEPART. SOME HIGH CLOUDS WILL DRIFT
BY FROM TIME TO TIME AS THEY MOVE AROUND RIDGING CENTERED OVER THE
GULF OF MEXICO AND EXTENDING INTO THE SOUTHEASTERN CONUS. MOISTURE
WILL THEN BEGIN TO INCREASE TOMORROW AFTERNOON AHEAD OF AN
APPROACHING SYSTEM. THIS WILL LEAD TO A CU DECK DEVELOPING BETWEEN 4
AND 6KT FEET MSL AROUND 18Z. CLOUDS WILL CONTINUE TO THICKEN IN THE
EVENING/OVERNIGHT...WITH RAIN SET TO IMPACT THE TAF SITES JUST AFTER
THE CURRENT TAF FORECAST PERIOD.


&&

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

$$

UPDATE...JMW
SHORT TERM...JP
LONG TERM...SHALLENBERGER
AVIATION...JMW






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