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Area Forecast Discussion

823
FXUS64 KHUN 271737 AAA
AFDHUN

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE HUNTSVILLE AL
1237 PM CDT MON APR 27 2015

.UPDATE...
FOR 18Z TAFS

&&

.DISCUSSION...
/ISSUED 1030 AM CDT MON APR 27 2015/
COLD AIR ADVECTION STILL IN PLACE IN THE LOW LEVELS AS NORTHERLY FLOW
AROUND A LARGE LOW OFF THE COAST OF MAINE CONTINUES. MODELS CONTINUE
TO KEEP THIS FLOW IN PLACE THROUGH THE DAY...SO COLD AIR ADVECTION
WILL CONTINUE THROUGH THE AFTERNOON HOURS. AT THE SAME TIME...A
BOUNDARY OVER SOUTHERN ALABAMA WILL CREEP NORTH SLIGHTLY. THIS WILL
BRING WARMER 850 MB TEMPERATURES TO PORTIONS OF NORTHERN
ALABAMA...MAINLY SOUTH OF THE TENNESSEE RIVER BY THE MID AFTERNOON
HOURS. IN PARTICULAR CULLMAN...MORGAN...FRANKLIN...AND COLBERT
COUNTIES IN NORTHERN ALABAMA COULD REACH 68 TO 71 DEGREES.

EXPECT QUITE A GRADIENT IN HIGH TEMPERATURES FURTHER NORTH...AS COLD
AIR ADVECTION WILL REMAIN STRONG AND IN PLACE THROUGH THE ENTIRE
AFTERNOON. CLOUD COVER SHOULD HELP TO KEEP TEMPERATURES SLIGHTLY
LOWER AS WELL. A BAND OF 500 MB MOISTURE WILL PUSH NORTH THROUGH THE
DAY...POSSIBLY KEEPING MOSTLY CLOUDY CONDITIONS IN PLACE THROUGH THE
EARLY AFTERNOON HOURS AROUND THE TENNESSEE RIVER.

AFTER 3 OR 4 PM...EXPECT CLOUDS TO THIN AGAIN DUE TO A DRIER ATMOSPHERIC
COLUMN REASSERTING ITSELF. THUS ADJUSTED CLOUD COVER EVERYWHERE TO
PARTLY CLOUDY LATE THIS AFTERNOON. OTHERWISE LOWERED DEWPOINTS DUE
TO SOME EXPECTED MIXING OF DRIER AIR ALOFT LATE THIS MORNING AND INTO
THE EARLY AFTERNOON HOURS. NO OTHER CHANGES TO THE FORECAST WERE
MADE.

KTW

&&

.AVIATION...
FOR 18Z TAFS...

VFR CONDITIONS ARE EXPECTED TO PREVAIL ACROSS N AL/S MIDDLE TN FOR
THE NEXT 24 HOURS. -SHRA ARE POSSIBLE LATE IN THE PERIOD MAINLY
AFTER 15Z AS AN UPPER LEVEL DISTURBANCE MOVES ACROSS THE SOUTHEAST
BUT HAVE NOT INCLUDED IN TAFS AT THIS TIME DUE TO TIMING AND SPATIAL
COVERAGE UNCERTAINTY. WINDS WILL GRADUALLY VEER FROM THE NE TO ENE BY
09Z.

SL.77

&&

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

$$

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



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