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000
FXUS64 KHUN 240521 AAB
AFDHUN

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE HUNTSVILLE AL
1221 AM CDT FRI MAY 24 2013

.UPDATE...
FOR 06Z TAFS

&&

.DISCUSSION...
/ISSUED 851 PM CDT THU MAY 23 2013/
A SFC COLD FRONT ADVECTING SOUTHWARD, AHEAD OF AN UPPER LOW OVER THE
GREAT LAKES, IS CURRENTLY LOCATED ACROSS THE TN RIVER VALLEY. BEHIND
THE FRONT ADDITIONAL SCT-BKN LOW CLOUDS WILL ADVECT SOUTHWARD FROM
THE OH RIVER VALLEY ALONG WITH DRIER AIR AND COOLER TEMPS OVER THE
NEXT 6-10 HOURS.

HAVE INCORPORATED HIGH END PARTLY CLOUDY CONDITIONS FOR THE ONCOMING
CLOUD COVER WITH THE FRONT. TEMPS ARE NOT COOLING OFF AS QUICKLY AS
ORIGINALLY FORECAST DUE TO WINDS STAYING HIGH ENOUGH TO TEMPER
RADIATIONAL COOLING. THUS, HAVE ADJUSTED OVERNIGHT LOWS BY MAKING
TWEAKS TO GUIDANCE FROM LOCAL WRF MODEL OUTPUT (AND TAKING INTO
ACCOUNT APPROACHING CLOUD COVER FOR LATER TONIGHT). MOST AREAS SHOULD
DROP OFF INTO THE LOW TO MID 50S. IN ADDITION, MADE TREND AND
ADJUSTMENTS TO THE DEWPOINTS AND WIND FORECAST WITH MORE OF A
TERRAIN GRADIENT INCORPORATED FOR WIND SPEEDS (I.E. HIGHER WIND
SPEEDS OVER HIGHER TERRAIN) AS SOMEWHAT HIGHER WINDS ARE PRESENT WITH
CAA FROM A N (LATER TO NE) WIND DIRECTION POST-FROPA. WINDSPEEDS
SHOULD THEN INCREASE AREAWIDE A COUPLE OF HOURS AFTER SUNRISE.

SL.77

&&

.AVIATION...
FOR 06Z TAFS...

VFR CONDITIONS SHOULD PREVAIL FOR MOST OF THE FORECAST PERIOD AS A
SFC COLD FRONT PASSES OVER THE REGION. A LOW CLOUD DECK THAT IS
GRADUALLY APPROACHING FROM THE NORTH HAS BEGUN TO BREAK UP. HOWEVER,
HAVE KEPT A TEMPO GROUP FOR MVFR CONDITIONS. NORTHERLY WINDS WILL
INCREASE TO 10-12KTS WITH GUSTS TO 20 KTS FROM 14Z-01Z.

SL.77

&&

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

$$

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