000
FXUS64 KHUN 230241 AAB
AFDHUN

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE HUNTSVILLE AL
941 PM CDT WED MAY 22 2013

.UPDATE...
TO ADJUST FORECAST FOR WEATHER, SKY COVER, AND DEWPOINT TRENDS.

&&

.DISCUSSION...
A FAIRLY COMPLEX SET OF BOUNDARIES ALONG WITH A WARM/MOIST AIRMASS
RESULTED IN ISOLATED TO SCATTERED SHOWERS AND THUNDERSTORMS ACROSS
THE TN VALLEY THIS AFTERNOON AND EVENING. THE MAIN UPPER TROUGH
REMAINS TO THE NORTHWEST OVER THE CENTRAL PLAINS WITH A COUPLE OF
SLOW MOVING FRONTS APPROACHING THE SOUTHEAST FOR TOMORROW INTO
TOMORROW NIGHT. MOST OF THE CONVECTIVE ACTIVITY HAS DIMINISHED WITH
THE EXCEPTION OF A FEW SHOWERS MOVING ACROSS JACKSON AND FRANKLIN
(TN) COUNTIES. CURRENT SFC ANALYSIS HAS A TONGUE OF MOISTURE (>65F
DEWPOINTS) OVER S/CENTRAL MS EDGING INTO CENTRAL AND PORTIONS OF
NORTH ALABAMA. THIS MOISTURE TONGUE WILL GRADUALLY SHIFT SOUTHEAST
WITH THE APPROACH OF A PRE-FRONTAL TROUGH (BRINGING SOMEWHAT DRIER
AIR) OVER THE LOWER MS RIVER AND ANOTHER FRONT TO THE NW OVER E MO/S
IL/IN/NW AR. THUS, HAVE ONLY RETAINED ISOLATED THUNDERSTORMS FOR THE
REMAINING CONVECTIVE ACTIVITY OVER FAR NE AL AND FRANKLIN COUNTY TN.

CLOUD COVER HAS CLEARED ALMOST COMPLETELY ACROSS NW AL WITH A GRADUAL
CLEARING FURTHER EAST OVER NE AL/S MIDDLE TN, AND HAVE ADJUSTED THE
SKY COVER FORECAST. DUE TO THE CLEARING AND DECREASING WINDS,
STILL EXPECTING PATCHY FOG TO DEVELOP MAINLY AFTER MIDNIGHT. IN
ADDITION, DEWPOINTS HAVE BEEN TRAILING OFF SLOWER THAN ORIGINALLY
FORECAST AND MADE SOME FURTHER ADJUSTMENTS TO THIS AS WELL.

SL.77

&&

.AVIATION...
/ISSUED 634 PM CDT WED MAY 22 2013/
FOR 00Z TAFS...
VFR CONDITIONS ARE EXPECTED TO PREVAIL ACROSS N AL AND S MIDDLE TN
FOR THE MOST NEXT 24 HOURS. ISOL -TSRA ARE POSSIBLE MAINLY BTWN
00-02Z ACROSS KHSV. THE MAIN EXCEPTION IS THE POSSIBILITY OF FOG
FORMATION ACROSS THE AREA WITH MVFR VIS POSSIBLE BTWN 08-12Z. FURTHER
DROPS IN VIS ARE POSSIBLE (ESPECIALLY AT KMSL), BUT NOT ENOUGH
CONFIDENCE TO INCLUDE AT THIS TIME. VFR CONDITIONS SHOULD THEN
PREVAIL AFTER 14Z. WIND SPEEDS WILL INCREASE TO 13 KTS GUSTING TO 20
KTS IN THE WAKE OF A COLD FRONT PASSING OVER THE REGION TOMORROW
MORNING.

SL.77

&&

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

$$

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AT WEATHER.GOV/HUNTSVILLE.