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000
FXUS64 KHUN 200523 AAC
AFDHUN

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE HUNTSVILLE AL
1223 AM CDT THU JUN 20 2013

.UPDATE...
FOR 06Z TAFS

&&

.DISCUSSION...
/ISSUED 949 PM CDT WED JUN 19 2013/
THE SCATTERED DIURNAL SHRA/TSRA THAT DEVELOPED MAINLY OVER SOUTHERN
MIDDLE TENNESSEE AND FAR NORTHEAST ALABAMA (AND ALONG OUTFLOW
BOUNDARIES) QUICKLY DISSIPATED FOLLOWING SUNSET AND HAVE LEFT A QUIET
RADAR OVER THE PAST HOUR IN THE TENNESSEE VALLEY. A CALM NIGHT IS
THEREFORE SETTLING IN WITH TEMPERATURES FALLING OFF RAPIDLY UNDER
MOSTLY CLEAR TO PARTLY CLOUDY SKIES. WHILE SOME LOCATIONS ARE READING
TEMPS A COUPLE DEGREE WARMER THAN THE SAME TIME YESTERDAY...THE
RELATIVE LACK OF HIGH CLOUDS HAS LED TO A QUICKER COOLING TREND
ACROSS THE CWA (NEARLY 10 DEGREES IN THE PAST 2 HOURS).

THE GOING FORECAST WAS IN GOOD SHAPE WITH THE EXCEPTION OF SOME MINOR
ADJUSTMENTS NEEDED TO ACCOUNT FOR THE COOLER VALLEYS IN NORTHEAST
ALABAMA VERSUS THE LINGERING URBAN HEAT AROUND KHSV FOR EXAMPLE. WITH
THE SCT SHOWERS THAT REMAINED IN THE AREA JUST AFTER
SUNSET...DEWPOINTS CONTINUE TO RUN A TAD HIGHER THAN THE FORECAST SO
LIKEWISE ADJUSTED THOSE VALUES TO ACCOUNT FOR PERSISTENT MOISTURE.
UPPER 60S TO LOWER 70S DEWPOINTS ACROSS MUCH OF THE SOUTHEAST ALSO
INDICATE THE MORE WIDESPREAD NATURE OF THIS PERSISTENT MOISTURE AHEAD
OF THE NEXT MID LEVEL SHORTWAVE.

THERE MAY BE SOME QUESTION ABOUT THE DEVELOPMENT OF PATCHY FOG LATE
TONIGHT INTO EARLY TOMORROW...BASED ON THE MORE RAPID COOLING TREND
AND LINGERING MOISTURE. BUT WITH THE SUNSHINE SEEN TODAY TO DRY THE
SFC (AFTER THE MORE WIDESPREAD RAIN YESTERDAY) AND THE LACK OF FOG
THIS MORNING...DO NOT SEE ANY REASON THE FOG THREAT WOULD BE ANY
HIGHER THAN THIS MORNING. HAVE THEREFORE KEPT THE QUIET WEATHER
FORECAST GOING THROUGH TOMORROW MORNING WITH NO FOG MENTION.

CCC

&&

.AVIATION...
FOR 06Z TAFS...PATCHY MVFR FOG MAY DEVELOP NEARING SUNRISE AROUND
BOTH TERMINALS BUT WILL QUICKLY DISSIPATE AFTER 12Z. AFTERWARDS...VFR
CONDITIONS WILL PERSIST THRU THE END OF THE PERIOD. SCT TO BKN MID
LVL CLOUDS CAN BE EXPECTED TO INCREASE THRU THE AFTN...WITH SCT
SHRA AND POSSIBLY -TSRA DEVELOPING AFTER 20Z. COVERAGE OF SCT PRECIP
SHOULD BE GREATER THAN THAT SEEN ON WEDNESDAY AFTN BUT LONG DURATION
IMPACTS TO THE TERMINALS ARE NOT ANTICIPATED ATTM.

CCC

&&

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

$$

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