Area Forecast Discussion
Issued by NWS Jackson, KY

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FXUS63 KJKL 261921
AFDJKL

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE JACKSON KY
321 PM EDT THU MAR 26 2015

.SHORT TERM...(THIS EVENING THROUGH FRIDAY NIGHT)
ISSUED AT 321 PM EDT THU MAR 26 2015

A LINE OF SHOWERS AND ISOLATED EMBEDDED THUNDERSTORMS IS CURRENTLY
MOVING ACROSS THE FAR EASTERN PORTION OF THE STATE...ABOUT TO EXIT
INTO VA AND WV. THIS CONVECTION IS RIDING ALONG THE COLD
FRONT...WHICH WILL ALSO BE EXITING TO OUR EAST OVER THE NEXT 1 TO 2
HOURS. BEHIND THIS FRONT...THERE IS A DRY SLOT...ENCOMPASSING MUCH
OF THE CWA WEST OF CONVECTIVE LINE. HOWEVER...STRATIFORM PRECIP IS
STILL SLOWLY MAKING ITS WAY ACROSS WESTERN AND CENTRAL KY...AND
SHOULD BE MAKING IT INTO OUR CWA OVER THE NEXT FEW HOURS. THE
BIGGEST THING TO NOTE BEHIND THIS FRONT IS THE QUICK CHANGE IN WIND
DIRECTION FROM THE SW TO THE NW...AND THE SHARP DROP IN TEMPERATURES
AS A RESULT. SOME 20 DEGREES DIFFERENCE HAS BEEN NOTED ACROSS OUR
WESTERN CWA IN LESS THAN ONE HOUR.

AN UPPER LEVEL LONGWAVE TROUGH IS CURRENTLY MOVING ACROSS THE
MISSISSIPPI RIVER VALLEY AND SHOULD SPREAD ACROSS THE OHIO RIVER
VALLEY OVERNIGHT. AS IT DOES...A STRONG UPPER LEVEL JET STREAK WILL
DEVELOP ACROSS EASTERN KY. THIS WILL LIKELY INTENSIFY THE LIGHT
STRATIFORM RAIN ACROSS EASTERN KY LATE THIS EVENING...BEFORE BEST
FORCING SHIFTS EAST OF THE REGION AND THE RAIN SHIELD FOLLOWS.
MODELS ARE IN FAIRLY GOOD AGREEMENT THAT ANY LINGERING RAIN SHOULD
BE OUT OF THE CWA BETWEEN 12 AND 18Z TOMORROW. HOWEVER...DRY
CONDITIONS WILL BE SHORT LIVED...AS ENERGY ALONG THE TROUGH AXIS
SHIFTS DIRECTLY OVER THE REGION...AND WORKS WITH LINGERING LLVL
MOISTURE TO CREATE THE CHANCE FOR MORE LIGHT QPF. EXPECT THIS TO BE
OUT OF THE REGION BY AROUND 12Z SATURDAY.

AS FOR PRECIP TYPES...TEMPERATURES WILL COOL TO AROUND FREEZING IN
MANY LOCATIONS OVERNIGHT. HOWEVER...ANY LINGERING MOISTURE WILL
LIKELY BE LOW AND SHALLOW AND OUT OF THE DENDRITIC GROWTH ZONE. AS
SUCH...WILL KEEP WITH PREVIOUS FORECAST THINKING THAT ICE GROWTH
SHOULD BE UNLIKELY AND RAIN WILL PREVAIL. TEMPS WILL RISE BACK ABOVE
FREEZING SATURDAY...THOUGH COLD NW FLOW AND CLOUD COVER WILL ONLY
ALLOW FOR TEMPS TO REACH THE MID 40S BY THE AFTERNOON WITH A COLD
RAIN POTENTIAL. MOISTURE AND CLOUDS WILL BEGIN TAPERING OFF AND
MOVING OUT LATE FRIDAY NIGHT...BUT NOT BEFORE SOME OF THE RAIN MAY
HAVE A CHANCE TO MIX WITH A FEW SNOWFLAKES. VERY LITTLE IMPACT /IF
ANY/ IS EXPECTED WITH THIS SNOW. IF WE ARE ABLE TO CLEAR OUT LATE
FRIDAY NIGHT...TEMPERATURES WILL LIKELY PLUMMET DOWN INTO THE LOW TO
MID 20S. THIS WILL RESULT IN A HARD FREEZE IN MOST AREAS ACROSS THE
CWA...THOUGH AFTER DISCUSSIONS WITH AG EXTENSION OF UK...THE IMPACTS
FROM THIS EVENT WILL LIKELY NOT WARRANT ANY HEADLINES AT THIS
TIME.

.LONG TERM...(SATURDAY THROUGH THURSDAY)
ISSUED AT 305 PM EDT THU MAR 26 2015

THERE IS GOOD MODEL AGREEMENT ON THE OVERALL EVOLUTION OF THE MEAN
PATTERN AS WE MOVE FROM A HIGHLY AMPLIFIED PATTERN WITH A DEEP
TROUGH IN THE EASTERN UNITED STATES AT THE BEGINNING OF THE
FORECAST PERIOD TO ZONAL FLOW NEXT WEEK. THIS WILL SPELL A
MODERATING TREND AFTER THE WEEKEND...BUT WITH FAST ZONAL FLOW WE
WILL SEE A SERIES OF WEAK FRONTAL SYSTEMS AFFECT THE AREA NEXT
WEEK...WITH EACH ONE BRINGING A CHANCE FOR RAIN. IN FACT THE
CHANCE OF RAIN WILL RETURN SUNDAY NIGHT. TEMPERATURES AT THE START
OF NEXT WEEK WILL RETURN TO NEAR NORMAL READINGS AND WILL THEN
TREND TO ABOVE NORMAL READINGS DURING THE SECOND HALF OF THE WEEK.

HOWEVER...BEFORE THE MODERATING TREND OF NEXT WEEK WE WILL NEED TO
ENDURE UNSEASONABLY COLD WEATHER FOR THE FIRST PART OF THE WEEKEND.
TEMPERATURES FROM SATURDAY INTO SUNDAY MORNING WILL AVERAGE ABOUT 20
DEGREES BELOW NORMAL. SURFACE HIGH PRESSURE WILL SETTLE INTO EASTERN
KY SATURDAY NIGHT. CLEARING SKIES AND LIGHT WINDS WILL ALLOW FOR
GOOD RADIATIONAL COOLING...WITH LOWS DIPPING DOWN INTO THE LOWER TO
MIDDLE 20S BY SUNDAY MORNING. AS HIGH PRESSURE SHIFTS EAST ON SUNDAY
AND WINDS BECOME SOUTHERLY TEMPERATURES WILL REBOUND INTO THE LOWER
TO MIDDLE 50S SUNDAY AFTERNOON.

&&

.AVIATION...(FOR THE 18Z TAFS THROUGH 18Z FRIDAY AFTERNOON)
ISSUED AT 152 PM EDT THU MAR 26 2015

A COLD FRONT IS CURRENTLY TRAVERSING FAR EASTERN KY...BRINGING
WITH IT A LINE OF HEAVY RAIN SHOWERS AND GUSTY WINDS. THESE
SHOWERS HAVE ALREADY PASSED THROUGH KSYM...KSME AND KLOZ WITH
IMPROVING CONDITIONS...BUT WILL CONTINUE TO AFFECT KJKL AND KSJS
OVER THE NEXT 30 TO 45 MINUTES. BEHIND THIS FRONTAL LINE...WINDS
ARE MAKING A QUICK SHIFT TO THE NW...ALLOWING MUCH COLDER AIR TO
WORK IN. EXPECT GUSTS OF 15 TO 20KTS TO CONTINUE OVER THE NEXT FEW
HOURS...BEFORE FINALLY DIMINISHING THIS EVENING AND OVERNIGHT AS
WINDS BECOME MORE NRLY. STRATIFORM RAIN IS CURRENTLY LOCATED OVER
WESTERN AND CENTRAL KY...AND SHOULD CONTINUE TO SLOWLY SHIFT INTO
OUR AREA THIS AFTERNOON...IMPACTING MOST OF THE TAF SITES WELL
INTO THE OVERNIGHT. EXPECT CIGS TO SLOWLY DETERIORATE INTO THE
MVFR TO IFR RANGE BY THIS EVENING...BETWEEN 500 AND 1000FT. BY
TOMORROW MORNING...RAIN WILL CLEAR OUT AND CIGS WILL LIKELY
IMPROVE...THOUGH MODELS ARE CONTINUING TO SUPPORT THE RETURN OF A
LAYER OF HIGH MVFR OR LOW END VFR CLOUDS BY THE END OF THE TAF
PERIOD.


&&

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

$$

SHORT TERM...JMW
LONG TERM...SBH
AVIATION...JMW


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