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Area Forecast Discussion

809
FXUS64 KHUN 221721 AAC
AFDHUN

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE HUNTSVILLE AL
1221 PM CDT TUE APR 22 2014

.UPDATE...
FOR 18Z TAFS

&&

.DISCUSSION...
/ISSUED 1035 AM CDT TUE APR 22 2014/
A WEAK, SHEARED MID-LEVEL TROUGH IS CURRENTLY MOVING ACROSS THE
DEEP SOUTH EASTWARD OVER THE CAROLINAS. MEANWHILE, A WEAK SFC COLD
FRONT LOCATED FROM NE TO SW OVER CENTRAL KY/TN/N MS WILL BE A FOCUS
FOR ADDITIONAL CONVECTIVE DEVELOPMENT THIS AFTERNOON.

AS THE MID-LEVEL WAVE TRACKED ACROSS THE TN VALLEY, LIGHT SHOWERS
DEVELOPED AND HAVE BEEN ONGOING WITH BTWN T-0.30 IN RAIN FALLING. VIS
SATELLITE IMAGERY INDICATES A BREAKING OF CLOUDS JUST AHEAD OF THE
COLD FRONT OVER NW AL/NE MS WITH A FAIRLY CONTINUOUS CLOUD DECK
FOLLOWING THE FRONT EXTENDING TO W TN/E AR. THIS AREA OF BROKEN CLOUDS
MAY RESULT IN ENOUGH DAYTIME HEATING TO ALLOW TEMPS TO RISE INTO THE
LOW TO MID 70S AND STEEPEN LAPSE RATES. WIND SHEAR IS QUITE WEAK, BUT
WITH THE STEEPENING OF THE LAPSE RATES, WEAK SB INSTABILITY WILL BE
POSSIBLE BY EARLY AFTERNOON. THUS, WILL KEEP ISOLATED THUNDERSTORMS
IN THE FORECAST THIS AFTERNOON MAINLY EAST OF NW AL DUE TO THE
PROGRESSION OF THE FRONT.

ALSO LOWERED NE AL DAYTIME HIGHS SLIGHTLY TO ACCOUNT FOR AREAS THAT
WILL BE UNDER CLOUD COVER LONGER. OTHERWISE, MADE SOME ADJUSTMENTS TO
THE SKY COVER FORECAST TO ACCOUNT FOR THE BREAKING OF THE CLOUDS
AHEAD OF THE FRONT.

SL.77

&&

.AVIATION...
FOR 18Z TAFS...
SHRA ACTIVITY WILL REMAIN POSSIBLE THROUGH 00Z WITH A COLD FRONT
CROSSING N AL/S MIDDLE TN. -TSRA ARE ALSO POSSIBLE BTWN 18-20Z AT
KMSL AND 19-21Z AT KHSV WHICH MAY DROP CONDITIONS TO MVFR OR LOWER.
WINDS WILL VEER FROM SSW (18Z) TO WNW/N BY 00Z AND NE BY 12-14Z.
TRAILING MVFR COULD DECK BEHIND THE COLD FRONT IS LIKELY ACROSS N
AL/S MIDDLE TN BTWN 20-00Z. MVFR VIS MAY ALSO BE POSSIBLE LATE IN THE
PERIOD BTWN 08-12Z DUE TO FOG FORMATION. OTHERWISE, VFR CONDITIONS
SHOULD PREVAIL.

SL.77

&&

.HUN WATCHES/WARNINGS/ADVISORIES...
AL...NONE.
TN...NONE.
&&

$$

FOR MORE INFORMATION PLEASE VISIT OUR WEBSITE
AT WEATHER.GOV/HUNTSVILLE.



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