Area Forecast Discussion
Issued by NWS Huntsville, AL

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000
FXUS64 KHUN 250532 AAC
AFDHUN

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE HUNTSVILLE AL
1232 AM CDT FRI JUL 25 2014

.UPDATE...
FOR 06Z TAFS

&&

.DISCUSSION...
/ISSUED 849 PM CDT THU JUL 24 2014/
A NICE EVENING IS UNDERWAY ACROSS THE TENNESSEE VALLEY, WITH CLEAR
SKIES AND LIGHT NORTHERLY WINDS IN PLACE. DEWPOINTS HAVE FALLEN INTO
THE LOWER/MIDDLE 60S IN A FEW SPOTS, WITH DRIER AIR NOTED UPSTREAM ON
THE TN/KY BORDER WITH DEWPOINTS IN THE MIDDLE 50S. WITH AN UPPER
RIDGE TO OUR WEST OVER THE CENTRAL CONUS AND A DEPARTING UPPER LOW
IN THE ERN CANADIAN PROVINCES, NW FLOW ALOFT WILL CONTINUE TO ADVECT
THIS DRIER AIR INTO THE CWFA OVERNIGHT.

AS SUCH, NOT MUCH CHANGE WAS NECESSARY WITH THE EVENING UPDATE.
HOURLY WX ELEMENTS WERE ON TRACK WITH OBSERVATIONAL TRENDS, WITH ONLY
SLIGHT CHANGES NEEDED TO THE SKY/POP GRIDS FOR TONIGHT (CLEAR/MOSTLY
CLEAR SKIES AND POPS DECREASED TO ZERO). OTHERWISE, THE ONLY FORECAST
CONUNDRUM TONIGHT CENTERS AROUND THE POTENTIAL FOR FOG DEVELOPMENT
OVERNIGHT. INHERITED PATCHY FOG IN THE GRIDS FROM THE DAYSHIFT, AND
IT WILL HONESTLY BE A BATTLE BETWEEN THE LINGERING MOISTURE IN PLACE
AND THE DRIER AIR ADVECTING INTO THE AREA FROM THE NORTH. AM FAIRLY
CONFIDENT THAT FOG WON`T BE AS WIDESPREAD (NOR AS DENSE) AS LAST
NIGHT, SO WILL RETAIN THE PATCHY FOG MENTION FOR NOW (AND WILL UPDATE
THE FORECAST LATER TONIGHT IF NECESSARY).

UPDATED ZONES ALREADY SENT.

12

&&

.AVIATION...
FOR 00Z TAFS...
NOT MUCH CHANGE FROM THE 00Z ISSUANCE: CLEAR SKIES AND VFR CONDS
WILL PREVAIL FOR A MAJORITY OF THE TAF PERIOD. FOG WILL DEVELOP AT
BOTH SITES OVERNIGHT, BUT HOW WIDESPREAD THE COVERAGE IS (AND THE
DENSITY OF THE FOG) IS UP FOR DEBATE. DRIER AIR IS ADVECTING INTO THE
AREA FROM THE NORTH, BUT LINGERING MOISTURE WILL LIKELY BE ENOUGH TO
PRODUCE AT LEAST PATCHY FOG TONIGHT. FOR NOW, WILL INCLUDE A TEMPO
MVFR GROUP AROUND DAYBREAK. ONCE THE FOG DISSIPATES A COUPLE OF
HOURS AFTER SUNRISE, LIGHT NORTHERLY WINDS AND A FEW CLOUDS ARND
25KFT WILL LINGER THROUGH THE DAY, WITH VFR CONDS EXPECTED UNTIL THIS
TIME TOMORROW.

12

&&

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

$$

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


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