Area Forecast Discussion
Issued by NWS Huntsville, AL

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000
FXUS64 KHUN 311716 AAC
AFDHUN

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE HUNTSVILLE AL
1216 PM CDT FRI OCT 31 2014

.UPDATE...
FOR 18Z TAFS

&&

.DISCUSSION...
/ISSUED 1013 AM CDT FRI OCT 31 2014/
A DREARY DAY IS UNDERWAY ACROSS THE TENNESSEE VALLEY, WITH
TEMPERATURES STRUGGLING TO REACH THE LOWER 50S AT THIS HOUR. THIS IS
ABOUT AS `WARM` AS TEMPS WILL GET TODAY, THANKS TO THE THICK CLOUD
COVER INHIBITING MUCH IN THE WAY OF INSOLATION THIS AFTERNOON. THE
STRONG COLD FRONT WE`VE BEEN ADVERTISING FOR SEVERAL DAYS NOW IS JUST
UPSTREAM OVER PORTIONS OF THE MID-MS RIVER VALLEY, BRINGING MUCH
COLDER (AND WINDY) CONDITIONS FOR THE TRICK-OR-TREATERS OUT THIS
EVENING. A STARK DIFFERENCE IN AIRMASS EXISTS PRE AND POST-FRONTAL,
WITH DEWPOINTS IN THE MIDDLE 40S AHEAD OF THE FRONT, QUICKLY
PLUMMETING DOWN INTO THE LOWER/MIDDLE 20S IMMEDIATELY IN ITS WAKE.
GUSTY NW WINDS 20-25KTS WERE ANALYZED ALONG/BEHIND THE FRONT AS WELL,
AND THIS WILL ARRIVE IN OUR CWFA A BIT LATER THIS AFTERNOON.

SKIES WILL QUICKLY CLEAR OUT LATER THIS EVENING AS THE FRONT PASSES
THROUGH, AND THANKS TO THE THE DROPPING TEMPS AND GUSTY NW WINDS,
WIND CHILL VALUES WILL FALL INTO THE LOWER 30S BY 8-9PM TONIGHT.
TEMPERATURES WILL THEN FALL TO AROUND/SLIGHTLY BELOW THE FREEZING
MARK BY SUNRISE/SHORTLY THEREAFTER, SO WILL NOT BE MAKING ANY
ADJUSTMENTS TO THE FREEZE WARNING (IN EFFECT FROM 4A-9A SATURDAY
MORNING) WITH THIS UPDATE.

FOR THE PUBLIC FORECAST UPDATE THIS MORNING, THOUGH, A FEW CHANGES
WERE NECESSARY. LOWERED AFTERNOON HIGHS A COUPLE OF DEGREES
(LOWER/MIDDLE 50S NW AL, MIDDLE/UPPER 50S NE AL), AND RE-RAN HOURLY T
VALUES. INSTEAD OF THE TYPICAL DIURNAL HIGH OCCURRING DURING THE MID-
AFTERNOON HOURS, IT WAS HASTENED TO OCCUR BY 19Z, FALLING THROUGH THE
REST OF THE DAY. MINOR ADJUSTMENTS WERE ALSO MADE TO THE WIND/WIND
GUST GRIDS, AND POPS WERE INCREASED PER RADAR TRENDS TO THE N/E AS
THE H5 SHORTWAVE CONTINUES TO DIVE SOUTHEASTWARD TOWARD THE
CAROLINAS.

UPDATED ZONES/PRODUCTS ALREADY SENT.

12

&&

.AVIATION...
FOR 18Z TAFS...
AN APPROACHING COLD FRONT WILL SWEEP ACROSS THE TERMINALS THIS
AFTERNOON, WITH GUSTY N/NW WINDS EXPECTED. SUSTAINED WINDS OF
10-15KTS AND GUSTS UP TO 25-30KTS WILL LINGER THROUGH THIS EVENING,
BUT EVEN OVERNIGHT WINDS WILL LINGER BETWEEN 10-15KTS. SKIES WILL
RAPIDLY CLEAR OUT THIS EVENING, WITH CLOUD COVER LINGERING E OF KHSV
THRU THE DAY TOMORROW. WIND GUSTS WILL REDEVELOP TOMORROW FROM MID-
MORNING THRU THE END OF THE TAF PERIOD, WITH GUSTS UP TO 25-30KTS
POSSIBLE. VFR CONDS WILL PREVAIL THRU THE TAF PERIOD AT BOTH SITES.

12

&&

.HUN WATCHES/WARNINGS/ADVISORIES...
AL...FREEZE WARNING FROM 4 AM TO 9 AM CDT SATURDAY FOR ALZ001>010-016.

TN...FREEZE WARNING FROM 4 AM TO 9 AM CDT SATURDAY FOR TNZ076-096-097.

&&

$$

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



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