Area Forecast Discussion
Issued by NWS Huntsville, AL

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000
FXUS64 KHUN 191438 AAB
AFDHUN

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE HUNTSVILLE AL
938 AM CDT FRI SEP 19 2014

.UPDATE...
FOR SKY COVER AND ADJUSTMENTS TO THUNDERSTORM FORECAST.

&&

.DISCUSSION...
GENERALLY PARTLY CLOUDY CONDITIONS ARE PREVAILING ACROSS THE TN
VALLEY THIS MORNING WITH LIGHT SOUTHERLY WINDS DEVELOPING AS THE SFC
HIGH PRESSURE SYSTEM CENTERED OVER NEW ENGLAND SHIFTS NE. AS A RESULT
OF THE WIND SHIFT, AN ILL-DEFINED SFC BOUNDARY WILL EDGE NORTHWARD
FROM CENTRAL AL TOWARDS NORTH ALABAMA LATER THIS MORNING INTO THE
AFTERNOON. AHEAD OF THIS BOUNDARY, ISOLATED SHOWERS ARE EXPECTED TO
DEVELOP GENERALLY SOUTH OF THE TN RIVER THIS MORNING. THEN, ISOLATED
TO SCATTERED THUNDERSTORMS ARE EXPECTED THIS AFTERNOON AS INSTABILITY
INCREASES ALONG THIS BOUNDARY WITH DAYTIME HEATING. RETAINED A NE TO
SW GRADIENT WITH THE POPS WITH HIGHER POPS OVER NW AL AND CULLMAN
COUNTY. A MICROBURST THREAT IS PRESENT AS EVIDENCED BY A INVERTED V
MIXED BOUNDARY LAYER AND HEAVY RAINFALL. LARGE HAIL DOES NOT APPEAR
TO BE A THREAT WITH THE HIGH WET BULB ZERO HEIGHT (~12-13KFT) AND
WARM MELTING LAYER. HOWEVER, COULD SEE SOME PEA SIZED HAIL WITH ANY
OF THE STRONGER PULSE-LIKE STORMS.

OTHERWISE, MADE ADJUSTMENTS TO THE SKY COVER FORECAST TO REFLECT THE
CURRENT CLOUD COVER TRENDS REFLECTED BY VIS SATELLITE AND CURRENT
OBS. TEMPERATURE AND DEWPOINT FORECAST LOOK ON TRACK WITH DAYTIME
HIGHS IN THE MID 80S AND DEWPOINT TEMPERATURES GENERALLY IN THE LOW
60S AT FIRST AND THEN RISING INTO THE MID TO UPPER 60S LATER THIS
AFTERNOON.

SL.77

&&

.AVIATION...
/ISSUED 619 AM CDT FRI SEP 19 2014/
FOR 12Z TAFS...
A WEAK BOUNDARY DRAPED ACROSS THE AREA WILL DEVELOP SHOWERS AND
STORMS IN THE VICINITY OF THE TERMINALS TODAY, WITH SLIGHTLY BETTER
CHANCES AT KMSL. SCATTERED CLOUDS THIS MORNING WILL BRIEFLY CLEAR
BEFORE THE SHOWERS AND STORMS DEVELOP BY MIDDAY, ENDING LATE THIS
EVENING. LOW CLOUDS ARE POSSIBLE HEADING INTO SATURDAY MORNING, BUT
WILL ONLY INCLUDE MVFR CEILINGS WITH THIS ISSUANCE (2500FT).

12

&&

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

$$

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


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