#55 Postby Brent » Fri Feb 10, 2006 4:08 pm
AREA FORECAST DISCUSSION...CORRECTED
NATIONAL WEATHER SERVICE BIRMINGHAM AL
301 PM CST FRI FEB 10 2006
.SHORT TERM...(TONIGHT - MONDAY NIGHT)
CURRENTLY ACROSS CENTRAL ALABAMA TEMPERATURES ARE IN THE 50S WITH
SOUTHERLY WINDS AND MOSTLY CLOUDY SKIES. MEASURABLE RAINFALL HAS
NOW MADE IT THROUGH EASTERN MISSISSIPPI AND STRETCHES BACK INTO
EASTERN TEXAS. THE ONSET OF PRECIPITATION IN WESTERN ALABAMA IS
BEGINNING NOW AS MOISTURE OVERCOMES THE DRY AIR IN PLACE ACROSS THE
AREA. FARTHER UPSTREAM...THE SNOW LINE HAS NOW REACHED SOUTH
CENTRAL ARKANSAS AND WESTERN TENNESSEE WITH THE RAIN/SNOW CHANGE
OVER OCCURRING AT THE 1305 1000-850 THICKNESS AND 543 1000-500
THICKNESS. WE SHOULD BE ABLE TO USE THOSE VALUES FOR OUR COUNTIES.
SO FIRST THING FIRST, ITS ALL RAIN THROUGH THE MIDNIGHT HOUR AS WARM
ADVECTION AND ISENTROPIC LIFT TAKE CONTROL OVER CENTRAL ALABAMA.
PLAN TO USE THE GFS AS THE STARTING POINT FOR THE FORECAST. AREAS
WEST OF I-65 AND SOUTH OF I-20/59 COULD SEE CLOSE TO AN INCH OF
RAINFALL BETWEEN 4 PM AND MIDNIGHT...AND WILL MENTION HEAVY RAINFALL
IN THE ZONES FOR THE SOUTH. AFTER MIDNIGHT THE BULK OF THE RAINFALL
WILL SHIFT EASTWARD TOWARDS MGM, AUO AND TOI. NORTH OF I-20...STORM
TOTALS WILL AVERAGE AROUND ONE HALF TO THREE QUARTERS INCH WITH MOST
OF THAT FALLING IN LIQUID FORM. WILL CONTINUE WITH THE 100 PERCENT
POPS FOR THE ENTIRE AREA.
SO THAT BRINGS US TO WINTER PRECIPITATION. FORECAST SOUNDINGS ARE
SHOWING THE POTENTIAL FOR A RAIN/SNOW MIX (543 AND 1305 THICKNESS)
ACROSS THE NORTHWESTERN COUNTIES AND THEN SWITCHING TO A MOSTLY SNOW
EVENT FOR OUR NORTHERN COUNTIES (LAMAR TO CHEROKEE) AROUND 3
AM...WITH A RAIN/SNOW MIX POSSIBLE DOWN TO AN ALICEVILLE TO ROANOKE
LINE. IT LOOKS LIKE PRECIPITATION WILL REALLY START TAPERING OFF
RIGHT ABOUT THIS TIME...WITH SURFACE TEMPERATURES IN THE MID TO
UPPER 30S. SO ACCUMULATIONS, IF ANY, SHOULD REMAIN LESS THAN AN
INCH. A SNOW ADVISORY WILL BE ISSUED FOR THOSE NORTHERN TIER
COUNTIES. WATCH FOR SLICK SPOTS ON BRIDGES AND OVER
PASSES...ESPECIALLY ALONG AND NORTH OF I-59.
FOR SATURDAY, WITH LARGE UPPER LOW SPINNING OVER THE OHIO VALLEY,
SENDING BITS OF ROTATING ENERGY THROUGH THE SOUTHEAST...FLURRIES OR
SNOW SHOWERS WILL BE POSSIBLE DURING THE DAY...MAINLY ACROSS THE
NORTHERN HALF. IT WILL BE POSSIBLE TO SEE A DUSTING OF SNOW IF YOU
ARE CAUGHT UNDER ONE OF THE SNOW SHOWERS. STRONG COLD ADVECTION AND
OVERCAST SKIES WILL KEEP TEMPERATURES THE 30S TO LOW 40S. CONTINUED
COLD ON SUNDAY AND MONDAY AND WILL STAY CLOSE TO GUIDANCE.
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