FXUS63 KLSX 151133
AFDLSX

AREA FORECAST DISCUSSION...UPDATED AVIATION
NATIONAL WEATHER SERVICE ST LOUIS MO
533 AM CST TUE DEC 15 2009

.DISCUSSION...
/250 AM CST TUE DEC 15 2009/

HIGH PRESSURE IS MAKING ITS WAY INTO THE REGION THIS MORNING. SO 
WILL SEE ARCTIC AIRMASS SINK INTO THE AREA WITH TEMPS STRUGGLING TO 
RISE INTO THE UPPER TEENS TO LOW 30S ACROSS THE FORECAST AREA... 
DESPITE PLENTY OF SUNSHINE. THIS WILL BE THE MAIN FORECAST ISSUE IN 
THE SHORT TERM.

FOR TONIGHT...RIDGE WILL BE OVERHEAD WITH CLEAR SKIES AND LIGHT 
WINDS...SO TEMPS TO DIP DOWN INTO THE SINGLE DIGITS FAR NORTH TO THE 
MID TEENS FAR SOUTH.

ON WEDNESDAY...RIDGE TO MOVE OFF TO OUR EAST ALLOWING SOUTHERLY 
WINDS TO RETURN ONCE AGAIN...WITH HIGHS IN THE LOW 30S TO LOW 40S.
LOWS WEDNESDAY NIGHT WILL BE IN THE LOW TO MID 20S. IT WILL BE EVEN 
WARMER ON THURSDAY WITH HIGHS IN THE UPPER 30S FAR NORTH TO NEAR 50 
OVER SOUTHEAST MO/SOUTHERN IL.

BEYOND THAT...MODELS CONTINUE TO INDICATE A WEAK SYSTEM APPROACHING 
THE AREA ON FRIDAY...WITH LIGHT SNOW MOVING IN FRIDAY NIGHT AND 
SATURDAY. EXPECT ANOTHER ROUND OF COLDER AIR TO MOVE INTO THE REGION 
BEHIND THIS SYSTEM. EXTENDED LOOKS GOOD...SO NO MAJOR CHANGES.

BYRD

&&

.AVIATION...
/526 AM CST TUE DEC 15 2009/

FOR THE 12Z TAFS...

LATEST SATELLITE IMAGERY AND SURFACE OBSERVATIONS INDICATE THERE
ARE STILL SOME LOW CLOUDS WITH BASES 015-020 ACROSS ERN MO INTO
CNTRL/SRN IL. HAVE EXTENDED TEMPO GROUPS INCLUDING MVFR CIGS AT
KSTL/KSUS UNTIL 14Z AS NWLY WINDS WILL CONTINUE TO BRING DRIER AIR
INTO THE REGION. OTHERWISE DRY AND VFR CONDITIONS EXPECTED NEXT
24-30 HOURS. CENTER OF HIGH PRESSURE WILL MOVE ACROSS THE REGION
TONIGHT...SO N-NWLY WINDS 10-14KTS TODAY WILL BECOME LGT AND VRB
AFT 00Z AND THEN INCREASE OUT OF THE SOUTH EARLY ON WEDNESDAY.

BRITT

&&

.LSX WATCHES/WARNINGS/ADVISORIES...
MO...NONE.
IL...NONE.
&&

$$

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