FXUS64 KHUN 052320 AAA
AFDHUN

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE HUNTSVILLE AL
520 PM CST SAT DEC 5 2009

.UPDATE...
00Z AVIATION DISCUSSION.
&&

.AVIATION...
SCT HIGH CLOUDS WILL SPREAD AND THICKEN ACROSS THE AREA THROUGH THE 
PERIOD...BUT VFR CONDITIONS ARE EXPECTED.
&&

.DISCUSSION...
COLD DOME OF HIGH PRESSURE IS CURRENTLY MOVING EWD INTO THE LOWER MS 
AND TN VALLEYS THIS AFTERNOON...AND THIS TREND SHOULD CONTINUE 
THROUGH THE EVENING AND OVERNIGHT HRS. THIS SHOULD TRANSLATE INTO A 
RATHER COLD NIGHT WITH OVERNIGHT LOWS FALLING INTO THE LOW/MID 20S 
RANGE UNDER CLR SKIES. THE SFC HIGH IS THEN XPCTED TO QUICKLY PUSH 
OFF TOWARD THE NE ON SUN AS A WEAK/DECAYING COLD FRONT MOVES THROUGH 
THE REGION MON. RAIN IS ALSO XPCTED TO DEVELOP ALONG AND AHEAD OF 
THIS FRONT LATE SUN NIGHT AND MON BEFORE A BRIEF CLRING TREND THEN 
XPCTED MON NIGHT. OVERALL TEMPS/CONDITIONS LOOK TO REMAIN QUITE COLD 
ACROSS THE AREA THROUGH MON NIGHT WITH A MOD POLAR AIR MASS 
REMAINING FAIRLY ENTRENCHED.

THE FORECAST THEN SHIFTS TOWARD THE MIDDLE OF NEXT WEEK WHERE A MORE 
POTENT LOW PRESSURE SYSTEM IS XPCTED TO IMPACT THE SE REGION. THE 
GLOBAL MODELS STILL POINT TOWARD A DEEPENING SFC LOW OUT OF THE SRN 
PLAINS RACING TOWARD THE OH VALLEY TUE NIGHT/WED...WITH WIDESPREAD 
RAINFALL DEVELOPING ACROSS MUCH OF THE SE. THE MODELS SUGGEST QUITE 
A BIT OF MID/UPPER FORCING ACCOMPANYING THE SFC LOW WHICH COULD 
RESULT IN SOME BOUTS OF HEAVY RAINFALL. LOW LEVEL INSTABILITY THOUGH 
CONTINUES TO APPEAR RATHER WEAK SUGGESTING LITTLE IF ANY SUPPORT FOR 
TSTMS AT THIS TIME. PRECIP WILL THEN BEGIN TO TAPER OFF ON WED AS A 
TRAILING COLD FRONT MOVES THROUGH THE AREA WITH COOLER AND DRIER AIR 
IN TOW.

ANOTHER STRONG...COLD DOME OF SFC HIGH PRESSURE OUT OF THE NRN/CNTRL 
PLAINS IS THEN XPCTED TO MOVE INTO THE REGION ON THU BEFORE MOVING E 
FRI. YET ANOTHER LOW PRESSURE/WEAK CLIPPER-LIKE SYSTEM OUT OF SE TX 
IS THEN XPCTED TO MOVE ACROSS THE AREA LATE FRI AND SAT WITH 
ADDITIONAL RAIN CHANCES POSSIBLE.
&&

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

$$

DISCUSSION...09
AVIATION...JE/23