Area Forecast Discussion
Issued by NWS Jackson, KY

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FXUS63 KJKL 282024
AFDJKL

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE JACKSON KY
424 PM EDT TUE JUL 28 2015

.SHORT TERM...(THIS EVENING THROUGH WEDNESDAY NIGHT)
ISSUED AT 359 PM EDT TUE JUL 28 2015

CURRENT CONDITIONS ACROSS EASTERN KENTUCKY FEATURE SHOWERS AND
THUNDERSTORMS ACROSS THE AREA SLOWLY SHIFTING OFF TO THE SOUTHEAST
AS THEY DEVELOP. THE MAIN CONCERN THIS AFTERNOON BEING THE HEAVY
RAINFALL POTENTIAL WITH PWATS IN THE 1.8 TO 2.2 RANGE AND PLENTY
OF INSTABILITY. THIS HAS BEEN OCCURRING WITH A WEAK DISTURBANCE
OVERHEAD WITH A FADED SURFACE BOUNDARY STRETCHING ACROSS THE AREA.
DUE TO THE SATURATED AIRMASS IN PLACE AND INSTABILITY IN
PLACE...WILL GO WITH CHANCE POPS WELL INTO THE EVENING TONIGHT AS
PERSISTENCE WOULD ALSO SUGGEST THIS. WILL CONTINUE WITH THE
MENTION OF HEAVY RAINFALL POSSIBLE IN THE HWO. THIS HAS ALSO
TEMPERED THE HIGH TEMPERATURES THIS AFTERNOON.

HEADING INTO TONIGHT...LINGERING CONVECTION IS EXPECTED TO
CONTINUE INTO THE FIRST PART OF TONIGHT...ESPECIALLY WITH THIS
SATURATED AIRMASS IN PLACE. WITH THIS INSTABILITY WILL BE SLOW TO
WANE ALONG WITH PWATS STILL IN THE 2 INCH RANGE. A BRIEF BREAK IN
PRECIP AND CLOUD COVER WILL LEAD TO FOG DEVELOPMENT LATE TONIGHT
AND WITH DEW POINTS REMAINING IN THE LOWER 70S WITH SOME MID
70S...FOG WILL BE DENSE IN SOME AREAS. MOIST SOUTHERLY FLOW IS
EXPECTED TO CONTINUE AND REMAIN PRONOUNCED WITH A BETTER DEFINED
FEATURE ON THE WAY IN THE FORM OF A COLD FRONT. THIS WILL PROVIDE
ENOUGH LIFT FOR CONTINUED SHOWER AND THUNDERSTORM DEVELOPMENT INTO
THE AFTERNOON ON WEDNESDAY. IN FACT...INTO WEDNESDAY NIGHT...PWAT
VALUES JUMP BEYOND THE 2 INCH RANGE WITH MODEL PROFILES SATURATED
TO NEARLY 500MB IN MOST LOCATIONS. FOR THIS...HAVE PUT LIKELY POPS
WEDNESDAY EVENING THROUGH WEDNESDAY NIGHT. SPC HAS ALSO MENTIONED
A MARGINAL WIND THREAT WITH THIS ACTIVITY ALONG THE FRONT BUT THE
MAIN IMPACT WILL AGAIN BE SLOW STORM MOTION WITH HEAVY RAINFALL
POSSIBLY CAUSING SOME MINOR FLOODING ISSUES.

IN ADDITION TO THE HEAVY RAINFALL...TEMPERATURES WILL REACH TO
AROUND 90 ON WEDNESDAY AFTERNOON WITH HEAT INDEX VALUES REACHING
AROUND 100 POSSIBLE IN SOME AREAS ADDING ANOTHER IMPACT TO BE
MINDFUL OF.

.LONG TERM...(THURSDAY THROUGH TUESDAY)
ISSUED AT 419 PM EDT TUE JUL 28 2015

EARLY IN THE PERIOD...THE MODEL CONSENSUS IS FOR A CLOSED LOW
CENTERED JUST SOUTH OF JAMES BAY AND ASSOCIATED SHORTWAVE TROUGH
EXTENDING SOUTH INTO THE GREAT LAKES AND LOWER OH VALLEY REGION. AT
THAT POINT...RIDGING IS EXPECTED TO BE CENTERED OFF THE EASTERN
SEABOARD...WITH ANOTHER RIDGE CENTERED OVER THE SOUTHERN PLAINS AND
EXTENDING NORTHWEST INTO THE PACIFIC NORTHWEST REGION. TO START THE
PERIOD...A SFC COLD FRONT SHOULD EXTEND FROM LOW PRESSURE OVER
ONTARIO SHOULD BE NEARING OR MOVING ACROSS EASTERN KY...WITH HIGH
PRESSURE BUILDING EAST TOWARD THE LOWER OH VALLEY REGION IN ITS WAKE.

DURING THE SECOND HALF OF THE WEEK AND INTO THE UPCOMING WEEKEND...
THE CENTER OF THE RIDGE INITIALLY OVER THE SOUTHERN PLAINS SHOULD
RETROGRADE WEST TO THE SOUTHERN ROCKIES AND THEN THE FOUR CORNERS
REGION...WHILE A TROUGH WILL EXTEND FROM THE HUDSON AND JAMES BAY
REGIONS SOUTH INTO THE EASTERN CONUS. ON THE MEAN...THIS PATTERN
SHOULD REMAIN IN PLACE INTO EARLY NEXT WEEK. SHORTWAVES WILL
PERIODICALLY ROTATE AROUND THE CLOSED UPPER LOW AND THROUGH THE
TROUGH IN NW FLOW...AND BRING PERIODIC INCREASES IN MID AND UPPER
LEVEL MOISTURE. THE ASSOCIATED SFC COLD FRONTS...ONE MOVING THROUGH
FRI NIGHT AND SAT SHOULD BE MOISTURE STARVED AND NOT PRODUCE MORE
THAN AN INCREASE IN CLOUDS. LATE IN THE PERIOD...ANOTHER COLD FRONT
WILL APPROACH THE AREA. THIS COLD FRONT NEARING THE OH VALLEY LATE
ON MONDAY AND INTO TUESDAY SHOULD HAVE A BIT MORE MOISTURE TO WORK
WITH.

LEFTOVER SHOWERS AND POSSIBLY A FEW THUNDERSTORMS WILL LINGER UNTIL
THE FRONT MOVES THROUGH THE REGION ON THURSDAY...WITH THE HIGHEST
CHANCES NEAR THE VA BORDER. HIGH PRESSURE WILL BUILD IN A BRING AN
AIRMASS THAT WILL BE A COUPLE OF DEGREES COLDER...WITH LOWER
DEWPOINTS AND LESS HUMIDITY BEING MORE NOTICEABLE. HIGHS MAINLY IN
THE MID 80S SHOULD BE COMMON FOR THU INTO SUNDAY...BEFORE WARMING
INTO THE UPPER 80S ON MONDAY AHEAD OF THE BOUNDARY. LOWS WILL AVERAGE
A COUPLE OF DEGREES BELOW NORMAL TO END THE WEEK...IN THE LOW TO MID
60S. IF DRY ENOUGH AIR MOVES IN BEHIND THE BOUNDARY...A FEW OF THE
NORMALLY COLDER SPOTS IN THE NORTH...NORTH OF THE MTN PARKWAY COULD
DROP TO 59 OR SO NO FRIDAY OR SATURDAY MORNINGS. PATCHY VALLEY FOG
SHOULD ALSO DEVELOP EACH MORNING FROM FRIDAY THROUGH SUNDAY. SLIGHT
POPS WERE USED LATE IN THE PERIOD...AHEAD OF THE APPROACHING FRONT.

&&

.AVIATION...(FOR THE 18Z TAFS THROUGH 18Z WEDNESDAY AFTERNOON)
ISSUED AT 130 PM EDT TUE JUL 28 2015

LOW LEVEL CLOUD COVER OVER THE AREA HAS THINNED OUT FOR THE DAY AS
HEATING CONTINUES INTO THE AFTERNOON. WITH THIS VFR CONDITIONS ARE
EXPECTED BUT WITH SHOWERS AND THUNDERSTORMS STILL EXPECTED...HAVE
PUT IN VCTS BUT ANY LOCATIONS THAT DOES GET A CELL MOVE OVER WILL
SEE BRIEF IFR AND BELOW CONDITIONS. AFTER CONVECTION WANES AFTER
02Z...A BREAK IN THE ACTIVITY WILL OCCUR BEFORE FOG FORMATION
OCCURS TONIGHT. WITH THE AIR MASS IN PLACE AND THE SHOWER ACTIVITY
EARLIER IN THE DAY...FOG WILL BE DENSE IN SOME AREAS AND HAVE PUT
BELOW FIELD MIN CONDITIONS AT THE TAF SITES TONIGHT. SITES SHOULD
IMPROVE BY 14Z TOMORROW MORNING BEFORE CU BEGINS TO BUILD BACK IN
FOR THE DAY.


&&

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

$$

SHORT TERM...SHALLENBERGER
LONG TERM...JP
AVIATION...SHALLENBERGER


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