Area Forecast Discussion
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000
FXUS62 KTAE 260746
AFDTAE

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TALLAHASSEE FL
346 AM EDT SUN APR 26 2015

.NEAR TERM [THROUGH TODAY]...

WATER VAPOR IMAGERY THIS MORNING SHOWS A POCKET OF MID TO UPPER
LEVEL DRY AIR ADVECTING INTO THE NORTHERN PORTIONS OF THE
FORECAST AREA. THE FLOW ALOFT WILL BE ZONAL ACROSS THE AREA
TODAY...AND WITH LITTLE IN THE WAY OF FORCING MECHANISMS...THE
COVERAGE OF CONVECTION IS EXPECTED TO BE LOWER THAN RECENT DAYS.
THE NORTHERN PORTIONS OF THE AREA WILL LIKELY REMAIN THUNDERSTORM
FREE TODAY WITH THE DRY AIR ALOFT. A FEW STORMS REMAIN POSSIBLE
THIS AFTERNOON FARTHER TO THE SOUTH WITH A WEAK BOUNDARY STILL IN
THE AREA. DAYTIME HIGH TEMPERATURES WILL BE QUITE WARM AGAIN WITH
GENERALLY MID 80S TO NEAR 90 EXPECTED.


.SHORT TERM [TONIGHT THROUGH TUESDAY]...

THE SYNOPTIC SURFACE COLD FRONT WILL PUSH JUST SOUTH OF THE
FORECAST AREA THIS EVENING AND STALL...LINGERING SOMEWHERE IN THE
VICINITY OF OUR ADJACENT COASTAL WATERS ZONES THROUGH THE SHORT
TERM PERIOD. WHILE THIS WILL GENERALLY SUPPRESS THE HIGHER SURFACE
DEWPOINTS AND INSTABILITY TO THE SOUTH OF OUR AREA...IT WILL ALSO
KEEP SHOWERS AND A FEW THUNDERSTORMS IN THE FORECAST THROUGH THE
PERIOD AS WELL. IN GENERAL THE MODELS SHOW LIGHTER QPF ON MONDAY
AND MONDAY NIGHT...WITH AN INCREASE AND NORTHWARD SHIFT ON TUESDAY
AS THE STALLED FRONT MAY BEGIN TO SLOWLY RETURN NORTH AS A WARM
FRONT IN RESPONSE TO AN EJECTING MID-UPPER LEVEL WAVE FROM THE
SOUTHERN PLAINS. WITH AT LEAST SOME PERIOD OF CLOUD COVER...ALONG
WITH RAIN CHANCES...DAYTIME HIGHS SHOULD BE NEAR OR JUST BELOW
NORMAL WITH OVERNIGHT LOWS REMAINING WELL ABOVE NORMAL.


.LONG TERM [TUESDAY NIGHT THROUGH SUNDAY]...

FROM TUESDAY NIGHT INTO WEDNESDAY MORNING...WE MAY SEE YET ANOTHER
SEVERE WEATHER EVENT UNFOLD ACROSS THE AREA AS A 120-140 KNOT
SPEED MAX AT 250MB SPREADS EAST ALONG THE GULF COAST AND THE MID-
UPPER LEVEL WAVE CONTINUES EJECTING ENE ACROSS THE SOUTH. SUCH
WIND SPEED VALUES AT 250MB ARE ABOVE THE 99TH PERCENTILE FOR THIS
TIME OF YEAR. THE MAIN QUESTION FOR SEVERE WEATHER CHANCES WILL BE
HOW FAR INLAND THE TRUE WARM SECTOR WILL PENETRATE...WHICH SHOULD
BE RELATED TO THE TRACK OF THE DEVELOPING SURFACE LOW. THE 00Z
RUNS OF THE NAM, GFS, AND ECMWF ALL TRACK THE SURFACE LOW THROUGH
OUR LAND AREAS WITH THE GFS FURTHEST SOUTHEAST AND ECMWF FURTHEST
NORTHWEST. THESE SOLUTIONS WOULD ALL PLACE AT LEAST A PART OF OUR
FORECAST AREA IN A RISK OF SEVERE WEATHER GIVEN ANOTHER HIGHLY
SHEARED ENVIRONMENT WITH MODERATE INSTABILITY (CAPE AROUND 1000
J/KG OR SO IN THE WARM SECTOR). STAY TUNED AS THE DETAILS ARE
LIKELY TO CHANGE AS THE POSSIBLE EVENT GETS CLOSER.

IN THE WAKE OF THE TUESDAY NIGHT TO WEDNESDAY SYSTEM...DEEP
NORTHWEST FLOW SETS UP OVER OUR FORECAST AREA AND THE REGION
WHICH SHOULD LEAD TO A PERIOD OF DRIER WEATHER. TEMPERATURES
SHOULD BE NEAR NORMAL.


&&

.AVIATION...

[THROUGH 12Z MONDAY] A FEW AREAS OF FOG ALONG WITH SOME LOW
CEILINGS WILL LIFT AND SCATTER OUT QUICKLY AFTER SUNRISE THIS
MORNING WITH VFR CONDITIONS EXPECTED TO RETURN BY MID-MORNING.
THERE IS A CHANCE OF AFTERNOON CONVECTION AT TLH...ECP...AND
VLD...BUT THE PROBABILITIES DO NOT APPEAR HIGH ENOUGH FOR ANY
TEMPO GROUPS AT THIS TIME.

&&

.MARINE...

SCEC LEVEL WINDS SHOULD CONTINUE OVER THE MARINE AREAS THROUGH MID
MORNING...PERHAPS INTO THE AFTERNOON IN APALACHEE BAY. A LULL OF
LIGHTER WINDS AND LOWER SEAS WILL THEN ARRIVE AND LAST INTO
TUESDAY BEFORE ANOTHER LOW PRESSURE SYSTEM APPROACHES. SCEC OR
ADVISORY CONDITIONS ARE POSSIBLE BEHIND THE COLD FRONT LATE
TUESDAY NIGHT INTO THURSDAY MORNING.

&&

.FIRE WEATHER...

MOIST CONDITIONS WILL PERSIST THROUGH THE NEXT FEW DAYS KEEPING
RELATIVE HUMIDITY VALUES WELL ABOVE CRITICAL LEVELS. RAIN
CHANCES REMAIN IN THE FORECAST THROUGH WEDNESDAY...WITH THE
POTENTIAL FOR LOCALLY HEAVY RAINFALL FROM A STRONGER STORM SYSTEM
TUESDAY AND WEDNESDAY.

&&

.HYDROLOGY...

AN ACTIVE WEATHER PATTERN HAS LEFT MANY OF OUR AREA RIVERS IN
ACTION STAGE, WITH A FEW THAT REACHED FLOOD STAGE. THE
CHOCTAWHATCHEE RIVER AT BRUCE AND THE APALACHICOLA RIVER AT
BLOUNTSTOWN ARE THE ONLY TWO SITES REMAINING IN FLOOD STAGE AND
HAVE BOTH PEAKED AND WILL CONTINUE TO FALL OVER THE NEXT FEW DAYS.
A ROUND OF HEAVY RAIN ON TUESDAY NIGHT AND WEDNESDAY MORNING MAY
CAUSE SOME AREA RIVERS TO RISE TO ACTION OR FLOOD STAGE BY THE
MIDDLE OF NEXT WEEK. CURRENTLY THE MOST VULNERABLE SITES WOULD BE
THE CHOCTAWHATCHEE AT BRUCE AND CARYVILLE AND THE APALACHICOLA
RIVER AT BLOUNTSTOWN AGAIN.

&&

.PRELIMINARY POINT TEMPS/POPS...

TALLAHASSEE   90  68  85  65  76 /  30  10  20  40  40
PANAMA CITY   82  70  79  66  75 /  40  20  30  40  50
DOTHAN        87  63  82  60  74 /  10  10  10  20  40
ALBANY        86  62  80  58  73 /  10  10  10  10  30
VALDOSTA      88  65  82  62  75 /  30  10  20  20  40
CROSS CITY    86  68  84  64  78 /  40  20  40  40  50
APALACHICOLA  83  71  79  69  77 /  40  20  30  50  50

&&

.TAE WATCHES/WARNINGS/ADVISORIES...
FL...NONE.
GA...NONE.
AL...NONE.
GM...NONE.
&&

$$

NEAR TERM...DVD
SHORT TERM...LAMERS
LONG TERM...LAMERS
AVIATION...DVD
MARINE...LAMERS
FIRE WEATHER...DVD
HYDROLOGY...MOORE/LAMERS



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