Area Forecast Discussion
Issued by NWS Huntsville, AL

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FXUS64 KHUN 120629 AAD
AFDHUN

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE HUNTSVILLE AL
129 AM CDT SAT JUL 12 2014

.UPDATE...TO ADD FOG OVERNIGHT


&&

.DISCUSSION...
AREA OBSERVATIONS SHOW NEAR SATURATED VERY SMALL DEWPOINT DEPRESSIONS
ACROSS MUCH OF NORTHERN ALABAMA...ESPECIALLY SOUTH OF THE TENNESSEE
RIVER. FURTHER NORTH SURFACE DEWPOINT DEPRESSIONS ARE CLOSER TO 3 TO
5 DEGREES. CALM WINDS ARE BEING REPORTED AT ALL STATIONS AT 120 AM.
THIS WILL CONTINUE...AS A WEAK MESOSCALE HIGH IS OVER THE FORECAST
AREA. JUST TO THE SOUTH OF THIS AREA...A STALLED BOUNDARY IS IN
PLACE. THIS FEATURE AND SUBTLE BOUNDARY LAYER ADVECTION FROM THE EAST
OR EAST SOUTHEST SHOULD ONLY RE-ENFORCE SATURATION OVERNIGHT.

THEREFORE ADDED AREAS OF FOG IN OUR SOUTHEASTERN PORTION OF OUR
FORECAST AREA IN CULLMAN...MARSHALL...DEKALB AND MORGAN COUNTIES.
FURTHER NORTH...BELIEVE THERE IS FOG POTENTIAL...BUT NOT AS
WIDESPREAD...DUE TO WIDER DEWPOINT DEPRESSIONS CURRENTLY SEEN IN
THOSE AREAS. SOME AREAS SUCH AS MUSCLE SHOALS AND SCOTTSBORO ARE
CLOSE TO SATURATION THOUGH...SO SOME POCKETS OF DENSER FOG ARE
POSSIBLE EVEN NORTH OF OUR SOUTHEASTERN COUNTIES.

KTW

&&

.AVIATION...
/ISSUED 1229 AM CDT SAT JUL 12 2014/
FOR 06Z TAFS...VFR CONDITIONS WILL PREVAIL AT KHSV AND KMSL UNTIL
FOG DEVELOPMENT SHORTLY BEFORE SUNRISE. EXPECT FOG TO DROP A BIT
LOWER AT KMSL INTO THE IFR REALM. KHSV SHOULD KEEP VSBYS IN THE MVFR
REALM...BUT WILL NEED TO MONITOR BOTH KHSV AND KMSL FOR LOWER VSBYS.
VFR CONDITIONS WILL RETURN TO THE VFR CATEGORY AFTER THE FOG
DISSIPATES AND AFTERNOON CU IS EXPECTED WITH LIGHT SOUTHEASTERLY
WINDS THROUGH THE DAY.

JMS/KTW

&&

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

$$

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


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