Area Forecast Discussion
Issued by NWS Huntsville, AL

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000
FXUS64 KHUN 180535 AAC
AFDHUN

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE HUNTSVILLE AL
1235 AM CDT SAT APR 18 2015

.UPDATE...
FOR 06Z TAFS

&&

.DISCUSSION...
/ISSUED 930 PM CDT FRI APR 17 2015/
RAIN THAT AFFECTED MUCH OF TENNESSEE VALLEY EARLIER TODAY HAD
FINALLY MOVED EAST OF THE REGION...AND/OR HAD DISSIPATED. SLIGHTLY
COOLER AIR FILTERING IN FROM THE EAST...AND THE DEPARTURE OF A WEAK
UPPER LEVEL SYSTEM HAS HELPED TO END THIS EPISODE OF PRECIPITATION.
A WESTERLY UPPER FLOW OTHERWISE PREVAILED ACROSS THIS PORTION OF THE
CONUS.

THE ON-GOING FORECAST FOR THE OVERNIGHT IS IN GOOD SHAPE. GIVEN THAT
THE SHOWERS HAVE DEPARTED...WILL KEEP THE PERIOD AFTER 18/0300Z OR
10 PM CDT DRY. BUT WITH CLOUDS DIMINISHING SOMEWHAT...ALONG WITH
RESIDUAL MOISTURE FROM RECENT RAINFALL AND PARTLY TO MOSTLY CLOUDY
SKIES...HAS SET THE STAGE FOR FOG FORMING LATER TONIGHT. GIVEN THAT
MORE CLOUDS THAN SKY WILL BE PRESENT...HAVE KEPT THE FOG AS PATCHY AS
OPPOSED TO AREAS OR WIDESPREAD. A FEW SPOTS...ESPECIALLY IN
SHELTERED VALLEYS AND UNDER LESS CLOUDS COULD EXPERIENCE LOCALLY
DENSE FOG BEFORE SUNRISE SATURDAY MORNING. GIVEN THE DIFFICULTY IN
TRYING TO FORECAST THE EXACT WHEN/WHERE...AND THE FACT THAT LESS FOG
USUALLY OCCURS IN THE SPRING...WILL MAKE NO UPDATES IN THE WEATHER
GRIDS. DID HOWEVER MAKE A FEW CHANGES TO OVERNIGHT LOWS AND CLOUD
COVER.

NEW FORECASTS REFLECTING NO RAIN AND THE OTHER TWEAKS WILL BE
FORTHCOMING SHORTLY.

RSB

&&

.AVIATION...
FOR 06Z TAFS...
ALREADY DEALING WITH FOG ISSUES AT KHSV AND KMSL AS OF 05Z. TAFS FOR
BOTH SITES WILL BE PESSIMISTIC INDICATING TEMPO 1/4SM AND VV001 WITH
PREVAILING HIGHER CATEGORIES. HOWEVER...INCOMING CIRRUS FROM STORMS
ALONG THE NW GULF COAST COULD KEEP THE WORST CASE SCENARIO FROM
OCCURRING. CONDITIONS SHOULD SLOWLY IMPROVE AFTER DAYBREAK...WITH VFR
WEATHER IN THE AFTERNOON. A SYSTEM MOVING IN FROM THE WEST WILL BRING
MORE MVFR CIGS AND -SHRA SAT EVENING. LATE IN THE TAF...MVFR AND IFR
WX SHOULD INCREASE. THERE COULD BE CONVECTION LATE IN PERIOD...BUT
HELD OFF DUE TO UNCERTAINLY THIS ISSUANCE.

BCC/RSB

&&

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

$$

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



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