FXUS66 KHNX 251303
AFDHNX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN JOAQUIN VALLEY - HANFORD CA
503 AM PST FRI DEC 25 2009

.SYNOPSIS...
HIGH PRESSURE PREVAILS THROUGH THE REST OF THIS WEEK...COLD AIR IS 
IN PLACE WITH AREAS OF FREEZING TEMPERATURES EXPECTED OVER NIGHT 
TONIGHT THROUGH SATURDAY MORNING IN THE SAN JOAQUIN VALLEY. A SERIES 
OF LOW PRESSURE SYSTEMS COULD BRING UNSETTLED CONDITIONS SUNDAY 
THROUGH THE MIDDLE OF NEXT WEEK.

&&

.DISCUSSION...EXPECT CONTINUED FAIR WEATHER FOR CHRISTMAS DAY 
BENEATH THE UPPER RIDGE OVER THE WEST COAST. A WEAK SHORTWAVE
IMPULSE DROPPING SOUTH THROUGH THE RIDGE WILL HAVE LITTLE EFFECT
ON INTERIOR CENTRAL CALIFORNIA OTHER THAN SOME HIGH CLOUDS PASSING
OVERHEAD TODAY. 

ADDITIONAL APPROACHING SHORTWAVE ENERGY IS PROGGED TO BEGIN
BREAKING DOWN THE RIDGE SATURDAY AND BRINGING AT LEAST SLIGHT
CHANCES OF PRECIPITATION TO THE DISTRICT SATURDAY NIGHT INTO
SUNDAY NIGHT AS THE DEVELOPING LOW DROPS SOUTH TOWARD BAJA. THE
OFFSHORE AND SOUTHERLY TRAJECTORY OF THE MAIN ENERGY WITH THIS
PASSING SYSTEM WILL LIMIT THE CHANCES FOR SIGNIFICANT
PRECIPITATION OVER OUR AREA. 

FURTHER SHORTWAVE IMPULSES TRACKING ACROSS THE REGION WILL THEN
KEEP LINGERING SLIGHT CHANCES FOR PRECIPITATION OVER MAINLY THE
MOUNTAIN ZONES THROUGH THE END OF NEXT WEEK...WITH TEMPERATURES
HOLDING NEAR CLIMO.

&&

.AVIATION...
IN THE SAN JOAQUIN VALLEY...PATCHY FOG IN LOW LYING AREAS RESULTING 
IN AREAS OF MVFR AND LOCAL IFR VISIBILITIES IN FREEZING FOG THROUGH 
18Z FRIDAY AND AGAIN AFTER 06Z SATURDAY. OTHERWISE...THE REMAINDER 
OF THE CENTRAL CA INTERIOR...VFR THROUGH 12Z SATURDAY.

&&

.AIR QUALITY ISSUES...
ON FRIDAY DECEMBER 25 2009... UNHEALTHY FOR SENSITIVE GROUPS IN
FRESNO COUNTY.  FIREPLACE/WOOD STOVE BURNING IS PROHIBITED IN
FRESNO... KERN... KINGS AND MADERA COUNTIES.
FURTHER INFORMATION IS AVAILABLE AT VALLEYAIR.ORG

&&

.HNX WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

$$

PUBLIC...JEB
AVN/FW...DCH
SYNOPSIS...PJ

WEATHER.GOV/HANFORD