Friday, January 29, 2010

Latest AFD From NWS Huntsville


Coulumbus NEXRAD 9:45

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HUNTSVILLE AL
953 AM CST FRI JAN 29 2010

.UPDATE...ISSUED WINTER STORM WARNING FOR PORTIONS OF THE AREA.
ALSO TWEAKED AFTERNOON HIGH TEMPS/WEATHER GRIDS TO FOLLOW CURRENT
TRENDS.

&&

.DISCUSSION...
ITS QUITE A BUSY MORNING WEATHER-WISE ACROSS THE TENNESSEE VALLEY
THIS MORNING WITH A MIXED BAG OF PRECIPITATION AFFECTING THE AREA.
REPORTS OF SLEET AND FREEZING RAIN HAVE COME IN FROM MANY COUNTIES
ALONG AND WEST OF I-65...WITH A FEW REPORTS TRICKLING IN FROM
ALONG AND EAST OF THE I-65 CORRIDOR NOW. WITH THE ACCUMULATIONS
THAT HAVE BEEN REPORTED ACROSS AREAS TO THE WEST...HAVE DECIDED TO
UPGRADE THE WINTER WEATHER ADVISORY TO A WINTER STORM WARNING AS A
RESULT.

WITH TEMPERATURES IN THE LOWER TO MIDDLE 30S AND DEWPOINTS IN THE
LOWER 20S...WET-BULBING WILL BE AN ISSUE THIS MORNING...ALLOWING
LIQUID PRECIPITATION TO REACH THE GROUND AS FROZEN PRECIP. AS
TEMPERATURES MODERATE SOMEWHAT LATE THIS MORNING/EARLY THIS
AFTERNOON...A CHANGEOVER TO RAIN IS EXPECTED FOR SEVERAL HOURS.
WITH THAT SAID...THE MAJORITY OF THE WARMING WILL OCCUR SOUTH AND
EAST OF A CULLMAN TO MARSHALL TO JACKSON COUNTY LINE. NORTH AND
WEST OF THIS LINE WILL LIKELY NOT SEE MUCH OF THIS WARMING...
ALLOWING THE PRECIPITATION TO REMAIN PREDOMINANTLY FROZEN
THROUGHOUT THIS EVENT.

AS THIS SYSTEM MOVES EASTWARD THROUGHOUT
THE DAY AND INTO TONIGHT...COLDER AIR WRAPPING AROUND THIS SYSTEM
WILL FILTER IN TO THE REGION. THIS WILL COMBINE WITH THE MOISTURE
IN PLACE TO CHANGE THE PRECIPITATION OVER ONCE AGAIN TO FREEZING
RAIN/SLEET/SNOW MIX...WHICH WILL CONTINUE OVERNIGHT AND INTO
SATURDAY MORNING.

&&

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