Area Forecast Discussion
Issued by NWS Huntsville, AL

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000
FXUS64 KHUN 300204 AAB
AFDHUN

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE HUNTSVILLE AL
904 PM CDT WED JUL 29 2015

.UPDATE...
FOR ADJUSTMENTS TO T-STORM/FOG/TEMPERATURE FORECAST.

&&

.DISCUSSION...

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...
/ISSUED 603 PM CDT WED JUL 29 2015/
FOR 00Z TAFS... VFR CONDITIONS ARE EXPECTED FOR MOST LOCATIONS THRU
TONIGHT. PATCHY BR MAY PRODUCE MVFR CATEGORY VSBYS (3-5SM) FROM
10-13Z. ALSO, A COLD FRONT DROPPING SOUTHEAST WILL PRODUCE SCATTERED
TSRA WHICH COULD IMPACT NORTH ALABAMA AND SOUTHERN TENNESSEE LATE
TONIGHT INTO EARLY THURSDAY. HOWEVER, THE PROB REMAINS TOO LOW TO
INCLUDE IN THE PREVAILING FORECAST ATTM. IF THIS PROB INCREASES,
EITHER AN AMD OR UPDATE AT 06Z WILL INCLUDE THIS POTENTIAL.

AK

&&

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

$$

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


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