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January GENERAL BANTER


oconeexman

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RAH is either very cautious or they just don't believe the hype.

THUS...WHILE LIKELIHOOD OF WINTRY PRECIPITATION SOMETIME IN THE

MONDAY-TUESDAY TIME FRAME APPEARS TO BE INCREASING...TOO MANY

UNKNOWNS (TIMING, DRYNESS OF SUBCLOUD LAYER, EVENTUAL TRACK OF VORT

MAX MONDAY NIGHT INTO TUESDAY, INTERACTION OF SURFACE LOW WITH

OFFSHORE BAROCLINIC ZONE) TO BE DEFINITIVE ON DEFINITIVE P-TYPE AND

AMOUNT. FOR NOW WILL ADJUST MAX TEMPS DOWN MONDAY AND TUESDAY BUT

MAINTAIN POPS IN THE CHANCE CATEGORY. WILL CONTINUE TO MENTION A

CHANCE OF SNOW OVER THE NW HALF WITH A MIXTURE RAIN/SNOW SE.

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SPECIAL WEATHER STATEMENT

NATIONAL WEATHER SERVICE BIRMINGHAM AL

232 PM CST THU JAN 6 2011

ALZ011>015-017>050-071100-

AUTAUGA-BARBOUR-BIBB-BLOUNT-BULLOCK-CALHOUN-CHAMBERS-CHEROKEE-

CHILTON-CLAY-CLEBURNE-COOSA-DALLAS-ELMORE-ETOWAH-FAYETTE-GREENE-HALE-

JEFFERSON-LAMAR-LEE-LOWNDES-MACON-MARENGO-MARION-MONTGOMERY-PERRY-

PICKENS-PIKE-RANDOLPH-RUSSELL-SHELBY-ST CLAIR-SUMTER-TALLADEGA-

TALLAPOOSA-TUSCALOOSA-WALKER-WINSTON-

232 PM CST THU JAN 6 2011

...CONFIDENCE INCREASING IN A WINTER WEATHER EVENT ACROSS CENTRAL

ALABAMA THIS WEEKEND...

WHILE WINTER WEATHER IS A RARITY ACROSS THE SOUTHERN STATES...THIS

WINTER HAS BEEN ANYTHING BUT NORMAL. THE CURRENT WEATHER PATTERN IS

CONDUCIVE FOR SNOWFALL ACROSS CENTRAL ALABAMA WITH A COLD UPPER

TROUGH OVER THE EASTERN UNITED STATES AND AN ACTIVE SOUTHERN JET

STREAM. SIMILAR TO THE WINTER WINTER WEATHER EVENT ON CHRISTMAS

WEEKEND...THE WEATHER MODELS ARE PREDICTING A SURFACE LOW TO FORM

IN THE NORTHERN GULF OF MEXICO. THE LOW WILL PULL GULF MOISTURE

NORTHWARD AND COLD AIR SOUTHWARD AS IT MOVES ACROSS THE GULF OF

MEXICO. CONFIDENCE IS INCREASING THAT CENTRAL ALABAMA WILL SEE A

VARIETY OF WINTRY PRECIPITATION THAT COULD START AS EARLY AS SUNDAY

MORNING ACROSS SOUTHWEST ALABAMA...AND SPREAD ACROSS ALL OF CENTRAL

ALABAMA DURING THE DAY SUNDAY. THE WINTRY MIX IS EXPECTED TO LAST

THROUGH MONDAY.

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FFC sounds like they prefer the Accuweather map and the GFS warm nose.

FOR THE LATTER HALF OF THE SHORT TERM PERIOD...ATTENTION WILL TURN

TO STRONG SOUTHERN UPPER LEVEL SYSTEM MOVING ONSHORE THE WEST

COAST OF THE US. GIVEN EXCELLENT AGREEMENT IN LONG TERM MODELS FOR

THE 12Z SUITE THROUGH 72 HOURS...CONFIDENCE IS INCREASING IN A

DEVELOPING WINTER STORM FOR THE AREA FOR LATE IN THE WEEKEND INTO

EARLY NEXT WEEK.

.LONG TERM /SUNDAY THROUGH THURSDAY/...

AS MENTIONED...CONFIDENCE LEVELS ARE VERY HIGH AT THIS POINT IN A

DEVELOPING LOW PRESSURE AT THE SURFACE ALONG THE IMMEDIATE GULF

COAST LATE SUN WITH THE GFS SLIGHTLY STRONGER IN ITS FEATURES.

CURRENT TRACK AND THERMODYNAMIC PROFILES ALL INDICATE A LARGE AREA

OF WINTRY PRECIPITATION EXPECTED FOR THE ENTIRE AREA AT SOME

POINT. WHAT IS LESS CERTAIN IS HOW PERSISTENT COLD AIR WILL BE IN

THE SHORT TERM AS WEDGE OVER CAROLINAS TRIES TO BUILD IN AND HOW

DYNAMIC OVERALL SYSTEM BECOMES WHICH WOULD BRING WARM NOSE IN

FASTER AND GIVE US MORE THAN JUST RA/SN DETERMINATION PROBLEMS.

GIVEN CURRENT MODEL PROJECTIONS AND BASED ON RECENT MODEL PERFORMANCE

DURING CHRISTMAS WINTER EPISODE...IT LOOKS AS THOUGH WE WILL SEE A

PERIOD OF -SN/-RA NORTH OF A COLUMBUS TO WASHINGTON LINE SUNDAY

AFTERNOON WITH JUST -RA ELSEWHERE. WET BULB EFFECTS SHOULD ALLOW

COLUMBUS TO WASHINGTON LINE NORTHWARD TO CHANGE OVER TO ALL -SN

WITH -SN MIXING WITH -RA TO THE SOUTH. IT SHOULD BE NOTED THAT

VERY MINOR CHANGES TO THE TRACK OF THE LOW WOULD GREATLY IMPACT

THIS SN/RA FORECAST. FURTHER COMPLICATING THE SCENARIO IS THE

DEVELOPMENT OF A WARM NOSE ON THE GFS WHICH WOULD ALLOW FOR A

TRANSITION TO SLEET OR FREEZING RAIN FOR THE NORTHERN 2/3RDS OF

THE REGION MONDAY MORNING AS SURFACE WEDGE HOLDS FIRM. UNTIL

MODELS HONE IN ON THERMODYNAMIC PROFILE WITH MORE AGREEMENT...WILL JUST

INDICATE SN/RA IN SPS AND GRIDS FOR THE AREA.

FOR THE REMAINDER OF THE PERIOD...HAVE ADJUSTED TEMPS DOWNWARD

SLIGHTLY BASED ON LATEST MEX GUIDANCE..ESPECIALLY OVER THE FAR

NORTH WHERE SN COVER MAY BECOME A FACTOR.

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