Area Forecast Discussion
Issued by NWS Huntsville, AL

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000
FXUS64 KHUN 300517
AFDHUN

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HUNTSVILLE AL
1217 AM CDT THU JUL 30 2015

.UPDATE...
FOR 06Z TAFS

&&

.DISCUSSION...
/ISSUED 904 PM CDT WED JUL 29 2015/

SCATTERED THUNDERSTORMS ORIGINATING FROM A COOL FRONT LOCATED NEAR
THE OH/TN/MS RIVER CONFLUENCE HAVE PROPAGATED SOUTH TO CENTRAL TN AS
OF 0145Z. WITH THE LOSS OF DAYTIME HEATING, INSTABILITY HAS
DIMINISHED SOMEWHAT AS A NOCTURNAL INVERSION DEVELOPS. THIS WOULD
LIKELY EXPLAIN THE STORMS DIMINISHING IN STRENGTH AS THEY APPROACH
THE TN VALLEY. HI RES MODEL OUTPUT IS DEPICTING THE POSSIBILITY THAT
THESE SCT STORMS COULD STILL IMPACT AT LEAST THE NW PORTIONS OF AL.
HOWEVER, WITH THE UNCERTAINTY ON OUTFLOW BOUNDARY PROPAGATION, WILL
KEEP ISOLATED TO SCATTERED THUNDERSTORMS IN THE FORECAST THROUGH THE
REST OF TONIGHT.

DUE TO EARLIER RAINFALL AND MOISTURE ADVECTION AHEAD OF THE
APPROACHING COLD FRONT, DEWPOINTS HAVE RISEN INTO THE MID TO UPPER
70S IN SOME LOCATIONS. BECAUSE OF THIS, HAVE RAISED THE DEWPOINT AND
OVERNIGHT LOW FORECAST. ONE OTHER LIKELY IMPACT WILL BE FOG FORMATION
WHEN THE HIGH LEVEL CLOUD COVER DISSIPATES OR THINS. AS A RESULT,
HAVE INCLUDED PATCHY DENSE FOG IN THE FORECAST FOR VALLEYS, RIVERS,
AND LAKES.

SL.77

&&

.AVIATION...
FOR 06Z TAFS...

ISOL -TSRA ARE POSSIBLE UNTIL APPROXIMATELY 15Z-17Z AS A COLD FRONT
SLOWLY PROCEEDS SOUTHEAST, BUT HAVE NOT INCLUDED IN THE TAFS AT THIS
TIME DUE TO ISOLATED NATURE. FOG FORMATION IS POSSIBLE BTWN 10Z-13Z
WITH MVFR CONDITIONS POSSIBLE. A COLD FRONT IS EXPECTED TO PASS OVER
THE REGION BTWN 12-15Z WHICH SHOULD CHANGE WIND DIRECTION/SPEED TO
N/NE.

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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