National Weather Service Text Product Display

Area Forecast Discussion
Issued by NWS Huntsville, AL

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000
FXUS64 KHUN 081743 AAC
AFDHUN

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE HUNTSVILLE AL
1143 AM CST SUN DEC 8 2013

.UPDATE...
FOR 18Z TAFS

&&

.DISCUSSION...
/ISSUED 1024 AM CST SUN DEC 8 2013/
TEMPERATURES ACROSS THE TENNESSEE VALLEY THIS MORNING RANGE FROM 38
AT MUSCLE SHOALS /KMSL/ TO 48 IN FORT PAYNE /4A9/. WHILE ONE BATCH OF
MODERATE TO HEAVY RAINFALL HAS SINCE PUSHED NORTHEAST OF THE CWFA,
ANOTHER ONE IS BLOSSOMING TO OUR SOUTHWEST ACROSS PORTIONS OF SRN
MS/WEST CENTRAL AL. ISENTROPIC UPGLIDE AT 295-300K MATCHES UP WELL
WITH THE NEXT SURGE OF MOISTURE/HEAVY RAINFALL TO OUR SW. ADDITIONAL
SUPPORT IS IN PLACE FROM THE PASSING UPPER JET TO OUR WEST AND THIS
WILL POSE A THREAT FOR AN ISOLATED THUNDERSTORM LATE THIS AFTN/THIS
EVENING. SOUNDINGS SHOW A LITTLE INSTABILITY OVER OUR AREA, BUT
GREATER VALUES TO OUR SOUTH/WEST, SO WILL FORGO THE FORMAL MENTION
WITH THIS UPDATE. THIS MAY NEED TO BE ADDED IN BY THE TIME THE AFTN
PACKAGE IS ISSUED, BUT WILL AWAIT TRENDS AS THE CURRENT STORMS MOVE
NORTHWARD/CLOSER TO THE AREA.

AS FAR AS THE GRIDS GO, A FEW TWEAKS WERE MADE TO ADJUST DAYTIME
HIGHS DOWNWARD A COUPLE OF DEGREES. HOURLY TEMP GRIDS WERE ADJUSTED
AS WELL, BUT OTHERWISE, NO CHANGES WERE NECESSARY AS ALL OTHER WX
ELEMENTS WERE IN GREAT SHAPE.

UPDATED PRODUCTS WILL BE SENT SHORTLY.

12

&&

.AVIATION...
FOR 18Z TAFS...
POOR FLYING CONDS ARE EXPECTED FOR MUCH OF THE TAF PERIOD AT BOTH
TERMINALS THRU 09/18Z TOMORROW. NEAR AIRPORT MINIMUM CONDS ARE
ONGOING AT KHSV AT THE MOMENT, BUT WILL IMPROVE TO LOW-END IFR BY
08/19Z. CONDS AT KMSL ARE A LITTLE BETTER WITHOUT THE REDUCED
VSBYS, BUT LOW CEILINGS REMAIN LOW-END IFR AS WELL. CONDS WILL
SLOWLY IMPROVE THROUGH 00Z TONIGHT AS A LARGE SWATH OF RAIN
OVERSPREADS THE TERMINALS. MVFR CONDS ARE POSSIBLE AFTER THIS TIME
AND FOR MUCH OF THE OVERNIGHT HOURS. RAIN WILL TAPER OFF FROM WEST TO
EAST TOWARD THE END OF THE TAF PERIOD TOMORROW, BUT CONFIDENCE IS
TOO LOW TO IMPROVE CEILING HEIGHTS MUCH ABOVE 1500FT WITH THIS
ISSUANCE. ANOTHER ROUND OF RAIN WILL DEVELOP AFTER THE TAF PERIOD,
SO ANY IMPROVEMENTS WILL BE SHORT-LIVED.

12

&&

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

$$

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AT WEATHER.GOV/HUNTSVILLE.

National Weather Service Weather Forecast Office