FXUS66 KHNX 281710
AFDHNX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN JOAQUIN VALLEY - HANFORD CA
910 AM PST SAT NOV 28 2009

.SYNOPSIS...
A LOW PRESSURE SYSTEM WILL MOVE AWAY TODAY LEAVING MUCH COOLER 
TEMPERATURES IN ITS WAKE. A SLIGHT CHANCE OF SHOWERS IS EXPECTED TO 
CONTINUE IN THE SOUTH VALLEY AND THE TEHACHAPI MOUNTAINS. LOCALLY 
STRONG WINDS ARE LIKELY OVER THE SIERRAS AND FOOTHILLS NORTH OF 
TULARE COUNTY THROUGH SUNDAY MORNING. PATCHY FOG EXPECTED IN THE 
VALLEY WITH WARMING TEMPERATURES IN STORE FOR SUNDAY THROUGH THE 
MIDDLE OF THE WEEK.

&&

.DISCUSSION...THE UPPER LEVEL LOW PRESSURE SYSTEM OVER
CENTRAL/SOUTHERN CALIFORNIA CONTINUES TO SLIP SOUTHWARD THIS
MORNING. PRECIPITATION IS NOW GENERALLY LIMITED TO UPSLOPE
PRECIPITATION DRIFTING OVER THE CREST OF THE SIERRA IN NORTHEAST
FLOW ON THE BACKSIDE OF THE LOW...AS WELL AS CONTINUED SHOWERS
OVER THE KERN COUNTY MOUNTAINS AND DESERT. SNOW LEVEL HAS BEEN AS
LOW AS ABOUT 4500 FEET THIS MORNING AND THE WINTER WEATHER
ADVISORY CONTINUES THROUGH THIS AFTERNOON FOR THE KERN COUNTY
MOUNTAINS AS LINGERING SHOWERS COULD AFFECT PASS LEVELS WITH SOME
SNOW THROUGH THE AFTERNOON. EXPECT CLOUDS TO GRADUALLY CLEAR FROM
THE NORTH IN THE SAN JOAQUIN VALLEY AND FOOTHILLS THIS AFTERNOON
WITH SOME CLOUDS REMAINING BANKED UP AGAINST THE KERN MOUNTAINS
INTO TONIGHT. 

PRECIPITATION CHANCES SHOULD END LATER THIS EVENING AS THE LOW
CONTINUES TO PUSH SOUTH. BUT IN THE WAKE OF THIS SYSTEM...THE
PATTERN IS SETTING UP FOR A MONO WIND EVENT ACROSS THE SIERRA AND
FOOTHILLS NORTH OF KINGS CANYON TONIGHT. THE UPPER JET IS ALIGNED
NORTHEAST-SOUTHWEST ACROSS THE YOSEMITE AREA TONIGHT ALONG WITH A
STRONG OFFSHORE SURFACE PRESSURE GRADIENT AND GOOD DOWNWARD MOTION
ACROSS THE SIERRA...SETTING UP A PATTERN FOR STRONG DOWNSLOPING
WINDS. A HIGH WIND WARNING HAS BEEN ISSUED FOR TONIGHT THROUGH 8
AM SUNDAY. GUSTY NORTHEAST WINDS CAN ALSO BE EXPECTED FARTHER
SOUTH IN THE TULARE COUNTY MOUNTAINS...BUT NOT AS STRONG AS 
FARTHER NORTH. IN THE DESERT AREAS...THE INDIANS WELLS VALLEY WILL
ALSO HAVE GUSTY NORTH WINDS AND MAY NEED A WIND ADVISORY THERE FOR
TONIGHT. 

FROM THE PREVIOUS DISCUSSION /ISSUED 559 AM SAT NOV 28/... 
HIGH PRESSURE IS THEN PROGGED TO BUILD OVER THE REGION SUNDAY
THROUGH TUESDAY...PROVIDING WARMING TEMPERATURES AND OVERNIGHT
VALLEY FOG DEVELOPMENT. THROUGH THE PERIOD. MODELS THEN DIVERGE IN
THEIR FORECAST OF THE STRENGTH AND TRAJECTORY OF THE NEXT PASSING
SHORTWAVE TROUGHS THROUGH THE REMAINDER OF NEXT WEEK. THE FORECAST
FOR THE LATTER HALF OF THE WEEK REMAINS PRECIPITATION FREE AT THIS
TIME...WITH TEMPERATURES HELD AROUND CLIMO...BUT AS THE EVOLUTION
OF THE UPSTREAM SHORTWAVES IS BETTER RESOLVED POPS MAY ENTER THE
FORECAST ALONG WITH MORE FLUCTUATIONS IN EXPECTED TEMPERATURES.

&&

.AVIATION...
AREAS OF MVFR/IFR THOUGH 22Z...BECOMING MAINLY VFR BY 00Z SUN.
AREAS OF CLOUDS/IFR CIGS REMAINING BANKED UP AGAINST THE LOWER 
FOOTHILLS OF THE SIERRA AND TEHACHAPIS HOWEVER THROUGH 18Z SUN.
PATCHY LATE NITE FOG IN THE SAN JOAQUIN VALLEY WILL LOCALLY REDUCE 
VISIBILITIES TO LIFR BETWEEN 10Z-18Z SUN.

&&

.AIR QUALITY ISSUES...
NONE

&&

.HNX WATCHES/WARNINGS/ADVISORIES...
HIGH WIND WATCH FROM THIS EVENING THROUGH SUNDAY MORNING FOR 
CAZ093-096.

WINTER WEATHER ADVISORY UNTIL 4 PM PST THIS AFTERNOON FOR CAZ095.

&&

$$

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AVN/FW...BINGHAM

WEATHER.GOV/HANFORD