Area Forecast Discussion
Issued by NWS Paducah, KY

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
000
FXUS63 KPAH 191938
AFDPAH

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PADUCAH KY
238 PM CDT SUN APR 19 2015

.SHORT TERM...(THIS EVENING THROUGH TUESDAY NIGHT)
ISSUED AT 235 PM CDT SUN APR 19 2015

SCATTERED SHOWERS AND THUNDERSTORMS WILL CONTINUE THIS AFTERNOON
THROUGH THE OVERNIGHT HOURS AS AN UPPER CLOSED LOW OPENS AND TRACKS
EAST NORTHEAST OUT OF THE SOUTHERN PLAINS AND ACROSS OUR REGION. IN
THE PROCESS IT WILL PUSH A COLD FRONTAL BOUNDARY ACROSS OUR CWA.
WITH PLENTY OF MOISTURE...WIND SHEAR...AND INSTABILITY IN
PLACE...THE PASSAGE OF THE FRONT AND UPPER ENERGY MAY PRODUCE A FEW
SEVERE THUNDERSTORMS WITH LARGE HAIL AND DAMAGING WINDS BEING THE
PRIMARY THREATS.

ACTIVITY SHOULD BEGIN TO DIMINISH FROM SOUTHWEST TO NORTHEAST
STARTING LATE TONIGHT INTO MONDAY MORNING IN THE WAKE OF THIS
SYSTEM. HIGH PRESSURE WILL THEN KEEP THE REGION DRY AND COOLER FROM
MONDAY AFTERNOON THROUGH TUESDAY MORNING.

PRECIPITATION CHANCES MAKE THEIR WAY BACK INTO THE FORECAST TUESDAY
AFTERNOON INTO TUESDAY NIGHT WITH THE APPROACH AND PASSAGE OF A
FRONT COMBINED WITH DEEPER MOISTURE AND BROAD CYCLONIC FLOW ALOFT.

TEMPERATURES WILL REMAIN BELOW NORMAL THROUGH THE PERIOD.

.LONG TERM...(WEDNESDAY THROUGH SUNDAY)
ISSUED AT 235 PM CDT SUN APR 19 2015

MODELS ARE COMING INTO A BIT BETTER AGREEMENT WITH REGARDS TO THE
WEATHER FOR MID TO LATE WEEK AND INTO THE WEEKEND...BUT TIMING
ISSUES REMAIN. WE START OUT THE PERIOD BY MONITORING A FRONTAL
BOUNDARY ADVANCING FROM THE NORTH ON WEDNESDAY...WHICH IS IN
ASSOCATION WITH A LARGE UPPER LEVEL CLOSED LOW SYSTEM NORTH OF THE
GREAT LAKES. THE GFS CONTINUES TO BE QUICKEST IN PUSHING THIS
FEATURE THROUGH THE AREA. THE 00Z ECMWF IS ABOUT 6 HRS SLOWER AND
LINGERS PRECIPITATION IN OUR SOUTHERN COUNTIES INTO WEDNESDAY
EVENING...WHILE THE LATEST RUNS OF THE GFS INDICATE WE SHOULD BE
DRY. HOWEVER...THE 12Z ECMWF IS VASTLY DIFFERENT AND SHOWING A
FAIRLY DRY FROPA AND NOW MUCH FASTER...EVEN FASTER THEN THE GFS.
WILL MAINTAIN LOW POPS. HIGH PRESSURE WILL STEADILY BUILD INTO THE
AREA SOMETIME WEDNESDAY NIGHT THOUGH...AND DRY THINGS OUT.

AS WAS THE THOUGHT ON YESTERDAYS DAY SHIFT...THURSDAY CONTINUES TO
LOOK MAINLY DRY AS HIGH PRESSURE REMAINS ENTRENCHED OVER THE REGION.
AN UPPER LEVEL RIDGE TO OUR WEST WILL SLOWLY SHIFT EAST THURSDAY
NIGHT INTO EARLY FRIDAY. THE 12Z GFS/ECMWF MODELS INDICATE THAT WE
COULD HAVE SOME ENERGY TOP THE RIDGE WHICH MIGHT RESULT IN SOME RAIN
SOMETIME IN THE THURSDAY THROUGH FRIDAY TIME FRAME...AS A NEW SYSTEM
CRASHES INTO THE BAJA AND MOVES INTO THE FOUR CORNERS REGION.
HOWEVER...THE GFS INDICATES THAT ANYTHING THAT FELL WOULD BE LIGHT
AND THE ECMWF ONLY BRINGS US A GLANCING BLOW TO OUR SOUTHWEST...SO
WILL LEAVE IT DRY FOR NOW.

MUCH BETTER CHANCES WILL LIKELY ARRIVE FRIDAY NIGHT INTO SATURDAY AS
THE AFOREMENTIONED SYSTEM MOVES OUT INTO THE CENTRAL PLAINS. THIS
TIMING HAS BEEN FAIRLY CONSISTENT AND GFS ENSEMBLES ALSO SUPPORT
THIS SCENARIO...SO HIGHER POPS ARE WARRANTED EVEN THIS FAR OUT IN
TIME. THIS SYSTEM IS PRETTY PROGRESSIVE AND OTHER THAN SOME
LINGERING RAIN CHANCES IN THE EVENING HOURS ON SATURDAY...THE SYSTEM
WILL BE MOVING OUT OF THE AREA LATE SATURDAY NIGHT. HIGH PRESSURE
WILL MIGRATE BACK INTO THE AREA FOR SUNDAY WHICH WILL ALLOW DRY
CONDITIONS TO RETURN.

HIGHS WILL BE GENERALLY IN THE 60S/40S...WITH SOME LOCALES REACHING
CLOSE TO 70 ON CERTAIN DAYS. BUT ALL IN ALL...TEMPS WILL BE AT OR
BELOW NORMAL. IN ADDITION...TRYING TO FIND WHAT PERIODS TO ADD
THUNDER TO THE WEATHER GRIDS IS CHALLENGING SINCE MODELS ARE ALL
OVER THE PLACE WITH REGARDS TO WHERE AND WHEN THE BEST INSTABILITY
WILL SET UP WITH THESE VARIOUS EVENTS.

&&

.AVIATION...
ISSUED AT 1210 PM CDT SUN APR 19 2015

IFR/MVFR CIGS AND VCSH EARLY SHOULD IMPROVE TO VFR THIS AFTERNOON
INTO THE EVENING HOURS...THEN DIMINISH BACK TO MVFR/IFR WITH
SHRA/TSRA OVERNIGHT THROUGH EARLY MONDAY MORNING...THEN GRADUAL
IMPROVEMENT THE LAST FEW HOURS OF THE FORECAST. SOUTH TO SOUTHWEST
WINDS AOB 10 KNOTS WILL PREVAIL THROUGH MOST OF THE PERIOD...THEN
VEER AROUND TO THE WEST TO NORTHWEST AT 12-14 KNOTS GUSTING UP TO
24 KNOTS IN THE WAKR OF A FRONTAL PASSAGE.

&&

.PAH WATCHES/WARNINGS/ADVISORIES...
IL...NONE.
MO...NONE.
IN...NONE.
KY...NONE.
&&

$$

SHORT TERM/AVIATION...JP
LONG TERM/FIRE WX...CW



USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.