Area Forecast Discussion
Issued by NWS Huntsville, AL

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000
FXUS64 KHUN 290555 AAC
AFDHUN

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE HUNTSVILLE AL
1255 AM CDT WED JUL 29 2015

.UPDATE...
FOR 06Z TAFS

&&

.DISCUSSION...
/ISSUED 930 PM CDT TUE JUL 28 2015/

THE CLUSTER OF THUNDERSTORMS THAT MOVED ACROSS S TN AND N AL EARLIER
THIS EVENING/LATE AFTERNOON HAVE FOR THE MOST PART DIMINISHED.
OUTFLOW BOUNDARIES FROM THE STRONG DOWNDRAFTS PRODUCED GUSTS TO 30
MPH IN SOME LOCATIONS ALONG WITH PROVIDING THE PRIMARY FOCUS FOR
PULSE THUNDERSTORM ACTIVITY. THE QUICKLY DIMINISHING REMNANTS OF THIS
ACTIVITY CURRENTLY RESIDE OVER LAWRENCE COUNTY AS STORMS DRIFT
SOUTHWARD. FURTHER NORTH A CLUSTER OF THUNDERSTORMS IS MOVING ACROSS
CENTRAL TN AND MAY GRAZE NW AL BTWN 03-06Z. AS A RESULT, HAVE
ADJUSTED THE POP/WX FORECAST TO REFLECT A GRADIENT OF HIGHER POPS
OVER NW AL. WITH MUCH OF NORTH CENTRAL AL/S TN STABILIZED FROM
EARLIER THUNDERSTORM ACTIVITY, NOT EXPECTING MUCH ACTIVITY THERE.
HOWEVER, HIGHER INSTABILITY DOES EXIST OVER NW AL. SO, IF THIS
ACTIVITY MAINTAINS ITS CURRENT TRAJECTORY AND CHARACTER, ANY
THUNDERSTORMS THAT DO DEVELOP WILL BE LIKELY BE FREQUENT LIGHTNING
AND GUSTY WIND PRODUCERS.

OTHERWISE, OVERNIGHT LOW TEMPERATURES WILL BE LOWER TONIGHT DUE TO
THE SHOWER AND THUNDERSTORMS THAT OCCURRED EARLIER. THIS IS APPARENT
FROM THE SFC OBS AND DEWPOINT TRENDS. THOUGH WIDESPREAD FOG FORMATION
IS NOT ANTICIPATED WITH THE CLOUD COVER, COULD SEE SOME PATCHY FOG
DEVELOP.

SL.77

&&

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

TSRA HAVE DIMINISHED WITH VFR CONDITIONS PREVAILING AT THE TAF SITES.
FOG FORMATION IS THE MAIN CHALLENGE THROUGH 29/13Z DUE TO RAINFALL
THAT OCCURRED EARLIER THIS EVENING. HAVE INCLUDED A DROP TO MVFR
BTWN 29/09Z-29/13Z BUT FOG IS PRIMARILY EXPECTED OVER NE AL (NEAR
K4A6/K4A9). THEN, TSRA ARE ALSO POSSIBLE AFTER 29/18Z AT TIMES THROUGH
THE REST OF THE PERIOD. HAVE INCLUDED VCTS IN TAFS FOR THAT TIME
PERIOD DUE TO TIMING UNCERTAINTY WITH MODEL OUTPUT.

SL.77

&&

.HUN WATCHES/WARNINGS/ADVISORIES...
AL...HEAT ADVISORY UNTIL 7 PM CDT WEDNESDAY FOR ALZ001>007-016.

TN...NONE.
&&

$$

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



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