FXUS64 KAMA 220545 AAB
AFDAMA

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE AMARILLO TX
1145 PM CST MON DEC 21 2009

.AVIATION...
LITTLE CHANGE FROM PREVIOUS TAF ISSUANCE. WIND SHIFT LINE TO MOVE
THROUGH THE PANHANDLES THROUGH THE OVERNIGHT HOURS. WINDS SHOULD
REMAIN LESS THAN 10 KNOTS THROUGHOUT THE TAF PERIOD. KEPT THE
NORTHERN TAF SITES VFR FOR NOW...BUT SOME LOWER CLOUDS MAY BEGIN TO
SNEAK INTO THE OK AND NORTHERN TX PANHANDLE TOWARDS THE END OF THIS
TAF CYCLE. 

TAB

&&

.PREV DISCUSSION... /ISSUED 541 PM CST MON DEC 21 2009/ 

AVIATION...
VFR FORECAST FOR THE NEXT 24 HOURS. INCREASING MID AND HIGH LEVEL
CLOUDS WILL CONTINUE TO STREAM INTO THE AREA TONIGHT INTO TUESDAY. 
WEAK WIND SHIFT TURNING WINDS AROUND TO THE NORTH CAN BE EXPECTED BY
SUNRISE...WITH SOUTHERLY WINDS RETURNING TO DHT/AMA BY 18Z OR SO.
WIND SPEEDS EXPECTED TO STAY AT 10 KNOTS OR LESS THROUGH THIS TAF
CYCLE.

TAB

PREV DISCUSSION... /ISSUED 315 PM CST MON DEC 21 2009/ 

DISCUSSION...
OVERALL THEME OF PREVIOUS FCST HAS BEEN KEPT...WITH A FEW REVISIONS.
SFC WINDS THIS EVE EXPECTED TO DIMINISH RAPIDLY...WITH QUIET WX TNGT
AND TUE.

SFC WAVE EXPECTED TO DEVELOP OVER NWRN ZONES ON TUE...WITH FRONTAL
BNDRY EXTENDING SE.  DRY AIR TAPPED BY SWLY LOW-LEVEL WINDS DURING
THE DAY LEAD US TO DELAY THE ONSET OF PCPN ACROSS SWRN ZONES...
KEEPING SWRN AND S-CENTRAL ZONES DRY THRU TUE NGT.

ACROSS NERN HALF OF FCST AREA...TUE NGT POPS STILL WARRANTED DUE TO
DEVELOPING UPSLOPE FLOW ON COOL SIDE OF BNDRY.  ISENTROPIC LIFT
EXPECTED TO BEGIN ALSO.  POPS HAVE BEEN KEPT FOR ALL ZONES WED AND
WED NGT.  HAVE DELAYED ONSET OF TRANSITION TO SNOW ACROSS SRN ZONES
TIL WED EVE...WHEN COLDER AIR EXPECTED TO ARRIVE.

SNOW EXPECTED TO BE EXCLUSIVE PCPN TYPE WED NGT AND THU ALL ZONES.
EXPECTING BEST OPPORTUNITY FOR ACCUMULATING SNOWS TO BE IN NWRN ZONES
ON WED AFTN...AREA WIDE WED NGT...AND ERN ZONES ON THU AS CLOSED
UPPER-LEVEL LOW DEPARTS.  NO POPS THEREAFTER.  NLY WINDS WED NGT AND
THU EXPECTED TO PRODUCE LOW WIND CHILLS AND AREAS OF BLOWING SNOW.
NRN SECTIONS EXPECTED TO REMAIN BELOW FREEZING WED THRU FRI.  MODEST
WARMING TREND FCST FOR SAT THRU MON.  03

COCKRELL

FIRE WEATHER...
NO FIRE WEATHER CONCERNS EXPECTED DURING THE NEXT SEVEN DAYS AS
RELATIVE HUMIDITY VALUES REMAIN WELL ABOVE CRITICAL THRESHOLDS.  03

&&

.AMA WATCHES/WARNINGS/ADVISORIES...
TX...NONE.
OK...NONE.

&&

$$

10/02