Area Forecast Discussion
Issued by NWS Paducah, KY

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000
FXUS63 KPAH 250058
AFDPAH

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PADUCAH KY
757 PM CDT TUE MAR 24 2015

.UPDATE...
ISSUED AT 757 PM CDT TUE MAR 24 2015

UPDATED AVIATION DISCUSSION ONLY.

&&

.SHORT TERM...(THIS EVENING THROUGH THURSDAY NIGHT)
ISSUED AT 326 PM CDT TUE MAR 24 2015

AT THE TIME OF THIS WRITING AN E-W ORIENTED QUASI-STATIONARY FRONT
EXTENDING EAST SOUTHEAST FROM A SURFACE LOW OVER SOUTHEAST KANSAS
LAY JUST SOUTH OF OUR CWA. AN AREA OF ELEVATED SHOWERS AND A FEW
THUNDERSTORMS OVER OUR CWA WILL CONTINUE TO DIMINISH FROM WEST TO
EAST THIS AFTERNOON AS THE AFOREMENTIONED FRONT BEGINS TO LIFT
NORTHEAST ACROSS THE AREA AS A WARM FRONT.

SHOWER AND THUNDERSTORM ACTIVITY IS EXPECTED TO INCREASE THIS
EVENING THROUGH THE OVERNIGHT HOURS AS THE AFOREMENTIONED SURFACE
LOW TRACKS TO THE NORTH AND WEST OF OUR AREA WHILE PUSHING A COLD
FRONT ACROSS THE MID MISSISSIPPI VALLEY. THUNDERSTORMS ARE POSSIBLE
THIS EVENING AND OVERNIGHT...HOWEVER GENERALLY NORTH AND WEST OF A
LINE FROM OWENSBORO KENTUCKY TO POPLAR BLUFF MISSOURI SUB-SEVERE
HAIL AND CONVECTIVE WIND GUSTS ARE POSSIBLE IN THUNDERSTORMS.

BY EARLY WEDNESDAY MORNING MOST ACTIVITY SHOULD BE NORTH AND EAST OF
OUR REGION. LATEST MODEL RUNS INDICATING A BRIEF RESPITE FOR OUR CWA
WEDNESDAY MORNING...THEN INCREASING CHANCES FOR SHOWERS AND
THUNDERSTORMS FROM WEST TO EAST FROM MID AFTERNOON ON AS ANOTHER
SURFACE LOW/FRONT RAPIDLY APPROACH OUR REGION.

THE SURFACE LOW AND ATTENDANT COLD FRONT IS FORECAST TO TRACK
NORTHEASTWARD ACROSS THE NORTHWEST HALF OF OUR CWA WEDNESDAY NIGHT.
WITH THE ORIENTATION OF THE FRONTAL BOUNDARY EXPECTED TO BE NEARLY
PARALLEL TO THE UPPER FLOW...THE APPROACH OF A SHARP UPSTREAM H5
TROUGH IS EXPECTED TO GENERATE MODERATE TO HEAVY RAINFALL ALONG AND
NORTHWEST OF THE SURFACE LOW TRACK. WITH 1.5-2 INCHES OF QPF
POSSIBLE WEDNESDAY NIGHT...WE WILL BE ISSUING A FLOOD WATCH FROM 7
PM WEDNESDAY EVENING THROUGH 7 AM THURSDAY MORNING. DURING THIS SAME
TIME FRAME THE REMAINDER OF THE AREA WILL GET A GOOD SOAKING BUT
AMOUNTS SHOULD BE TOO LOW TO WARRANT A FLOOD WATCH. ALSO DURING THIS
PERIOD...GENERALLY OVER THE NORTHWEST HALF OF OUR CWA...THERE IS A
SLIGHT CHANCE FOR A FEW THUNDERSTORMS TO BECOME SEVERE WITH LARGE
HAIL AND DAMAGING WINDS BEING THE PRIMARY THREATS.

IN THE WAKE OF THIS SYSTEM...PRECIPITATION CHANCES WILL DIMINISH
FROM WEST TO EAST ON THURSDAY AS HIGH PRESSURE BEGINS TO OVERSPREAD
THE AREA. UNFORTUNATELY THE AREA OF HIGH PRESSURE WILL DRIVE
TEMPERATURES BACK TO BELOW NORMAL LEVELS WITH READINGS DIPPING TO AT
OR BELOW FREEZING THURSDAY NIGHT...ESPECIALLY OVER THE NORTHERN TWO
THIRDS OF OUR CWA. PERSONS IN THESE AREAS SHOULD BE PREPARED TO
COVER ANY TENDER OUTDOOR VEGETATION THAT MAY ALREADY BE BUDDING DUE
TO THE RECENT WARMER TEMPERATURES.

.LONG TERM...(FRIDAY THROUGH TUESDAY)
ISSUED AT 326 PM CDT TUE MAR 24 2015

AN ACTIVE WEATHER PATTERN WILL CONTINUE THROUGH THE LONG TERM AS A
SERIES OF SHORTWAVES ROTATES SOUTHEAST ACROSS THE MISSISSIPPI
VALLEY. THE MEAN TROUGH POSITION OVER THE EASTERN STATES...WHICH HAS
SEEMINGLY BEEN A SEMI-PERMANENT FEATURE...WILL PRODUCE A CHILLY AND
RATHER MOIST FLOW PATTERN OVER OUR REGION.

ON FRIDAY...THE AXIS OF A SHARPENING 500 MB TROUGH WILL MOVE EAST OF
THE LOWER OHIO VALLEY. DRYING AND SUBSIDENCE IN THE WAKE OF THIS
FEATURE WILL RESULT IN PARTIAL CLEARING. EVEN WITH THE
SUNSHINE...HIGH TEMPS WILL ONLY BE IN THE 40S. THESE CHILLY HIGHS
ARE SUPPORTED BY 850 MB TEMPS AROUND MINUS 5.

ON FRIDAY NIGHT AND SATURDAY...THE LOW LEVEL THERMAL TROUGH AXIS
WILL PASS ACROSS THE LOWER OHIO VALLEY. THE MINUS 10 ISOTHERM AT 850
MB WILL PENETRATE AS FAR SOUTH AS THE LOWER OHIO VALLEY. AT THE SAME
TIME...THERE IS NOW RATHER GOOD AGREEMENT THAT A SMALL-SCALE 500 MB
SHORTWAVE WILL DIVE SOUTHWARD ACROSS MISSOURI LATE FRIDAY NIGHT. THE
MAJORITY OF GUIDANCE DEPICTS A SWATH OF QPF ACROSS SE MISSOURI LATE
FRIDAY NIGHT INTO EARLY SATURDAY. THERE APPEARS TO BE SUFFICIENT
COLD AIR IN PLACE FOR SNOW DURING THIS TIME PERIOD. WILL INTRODUCE
SLIGHT CHANCE POPS FOR NOW...MAINLY WEST OF THE MISSISSIPPI RIVER. A
COATING OF WET SNOW APPEARS QUITE POSSIBLE WITH THIS
SHORTWAVE...ESPECIALLY IF THE LATE NIGHT/EARLY MORNING TIMING
VERIFIES.

ON SATURDAY NIGHT AND SUNDAY...LOW LEVEL WINDS WILL BECOME SOUTHERLY
ON THE BACK SIDE OF HIGH PRESSURE RETREATING OFF TO OUR EAST. TEMPS
WILL MODERATE INTO THE 50S ON SUNDAY AS MOISTURE INCREASES AHEAD OF
A SOUTHEASTWARD MOVING COLD FRONT OVER MISSOURI. THERE IS A SLIGHT
CHANCE OF SOME SHOWERS OVER PARTS OF SW INDIANA AND SRN ILLINOIS IF
THE FRONTAL TIMING IS FAST ENOUGH.

ON SUNDAY NIGHT AND MONDAY...THE WEAK FRONT WILL CONTINUE TO WEAKEN
AS IT CROSSES OUR REGION. ANY PRECIP ALONG THE FRONT SHOULD BECOME
RATHER ISOLATED. A SLIGHT CHANCE OF SHOWERS WILL BE FORECAST FOR
MONDAY. HIGHS IN THE WAKE OF THE DISSIPATING COLD FRONT ON MONDAY
MAY ACTUALLY BE A LITTLE WARMER THAN AHEAD OF IT. TEMPS SHOULD
CONTINUE TO GRADUALLY MODERATE THROUGH THE 60S ON TUESDAY AS WEAK
HIGH PRESSURE MOVES OFF TO OUR EAST.

&&

.AVIATION...
ISSUED AT 757 PM CDT TUE MAR 24 2015

A WARM FRONT/COLD FRONT COMBINATION WILL PASS THROUGH PARTS OF THE
REGION OVERNIGHT AND INTO THE EARLY MORNING. VFR CONDITIONS ARE
EXPECTED THROUGH THE 00Z TAF PERIOD...EXCEPT PERHAPS BRIEF VSBY
REDUCTIONS TO MVFR IN RAIN...THOUGH THE REDUCTIONS WERE NOT INCLUDED
IN THE TAFS AT THIS TIME. AS THE PARENT LOW PRESSURE AREA MOVES BY
TO THE NW...WINDS WILL VEER IN DIRECTION...GUSTING UP TO 20 KTS WITH
THE ARRIVAL OF PCPN DURING THE NIGHT. FEWER CLOUDS WILL BE SEEN
DURING THE DAY WED AS A GENERALLY SRLY LIGHT WIND CONTINUES.

&&

.PAH WATCHES/WARNINGS/ADVISORIES...
IL...FLOOD WATCH FROM WEDNESDAY EVENING THROUGH THURSDAY MORNING FOR
     ILZ075-076-080>082-084-085-088.

MO...FLOOD WATCH FROM WEDNESDAY EVENING THROUGH THURSDAY MORNING FOR
     MOZ076-086-087-100-107.

IN...NONE.
KY...NONE.
&&

$$

SHORT TERM...JP
AVIATION...DB
LONG TERM/FIRE WX...MY


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