Wind Advisory 19, NWS Hanford, CA

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN JOAQUIN VALLEY - HANFORD CA
1029 AM PDT WED APR 28 2010

.SYNOPSIS...

A UPPER LEVEL DISTURBANCE CONTINUES TO MOVE OVER THE AREA TODAY
BRINGING A CHANCE OF RAIN AND SNOW SHOWERS. ALSO EXPECT WINDY
CONDITIONS IN THE KERN COUNTY MOUNTAINS AND DESERT THROUGH TONIGHT.
TEMPERATURES WILL BE QUITE COOL FOR THE REMAINDER OF THE
WEEK...HOWEVER HIGH PRESSURE WILL RETURN AND START A WARMING TREND
BY LATER THIS WEEKEND.

&&

.UPDATE...STRONG ONSHORE FLOW RESULTING IN LOTS OF UPSLOPE CLOUDS
ALONG THE SIERRA FOOTHILLS TEHACHAPIS AND SOUTH VALLEY.
SURPRISINGLY HIGHER ELEVATIONS OF THE SIERRA MAINLY CLEAR DUE TO A
MID LEVEL STABLE LAYER 8-11KFT. ANOTHER ROUND OF SHOWERS EXPECTED
THIS AFTERNOON AS UPPER SHORT WAVE ENERGY MOVES TOWARDS CENTRAL
CALIFORNIA THIS AFTERNOON AND EVENING. LEADING SHOWER ACTIVITY
ALREADY MOVING INTO WEST MERCED COUNTY. MODELS INDICATE MID LEVEL
LAPSE RATES LAYERS BECOMING UNSTABLE THIS AFTERNOON ACROSS THE SAN
JOAQUIN VALLEY. HOWEVER CAPES OF NEAR 100JKG WILL BE LIMITED
TOWARDS THE CENTRAL VALLEY THIS AFTERNOON. THINK LITTLE THREAT OF
THUNDER WITH MAINLY CONVECTIVE SHOWER THREAT THIS AFTERNOON. DEEP
CONVECTIVE GROWTH WILL BE LIMITED BY STRONG STRAIGHT LINE SHEAR
AND POTENTIAL STORM TOP GROWTH TO 15KFT. SHOWERS COULD PROVIDE
SMALL HAIL AS WET BULB IS LOW AROUND 4KFT. THINK STORM THREAT WITH
SHOWERS WILL BE LOCAL HEAVY RAIN...SMALL HAIL AND STRONG DOWN BURST
WIND GUSTS. NO UPDATES PLANNED THIS MORNING.

.DISCUSSION...THE COLD FRONT HAS JUST ABOUT CLEARED CENTRAL CA AND
WILL BE OVER SOCAL BY DAYBREAK. WHAT LOOKED LIKE A SOLID RAIN
PRODUCER YESTERDAY AT THIS TIME...WEAKENED CONSIDERABLY YESTERDAY
AFTERNOON AND EVENING AS ITS UPPER LEVEL SUPPORT RACED OFF TO THE
EAST. FEW PLACES OUTSIDE OF THE SRN SIERRA SAW ANY PRECIP. BUT ALL
HOPE OF RAIN IS NOT GONE.

THE CURRENT PATTERN WILL EVOLVE INTO A BROAD UPPER LEVEL LONG WAVE
TROF OVER THE WEST HALF OF THE COUNTRY THE NEXT 2 DAYS. A
SHORTWAVE MOVING INTO THE MEAN TROF POSITION WAS CURRENTLY NEARING
130W. THIS CAN BE SEEN ON SAT PIX IN THE INCREASING OPEN CU FIELD
APPROACHING THE WEST COAST. SOME OF THIS ENERGY WILL MOVE INTO
CENTRAL CA THIS AFTN...AND PRODUCE SOME SCATTERED SHOWER ACTIVITY
IN THE VALLEY...WITH MORE NUMEROUS SHOWERS IN THE SIERRA. ALLOWED
THE WINTER WX ADVISORY TO GO AWAY THIS MORNING...AS ANY SNOWFALL
TODAY WILL BE FAIRLY LOCALIZED AND IN THE 6 INCH OR LESS RANGE.

WINDS WILL BE ON THE INCREASE TODAY...AND WILL INCREASE TO WARNING
CRITERIA THROUGH AND BELOW WIND FAVORED PASSES AND CANYONS OF KERN
COUNTY LATE MORNING OR EARLY AFTN. BREEZY IN THE VALLEY TODAY BUT
DONT EXPECT WINDS TO REACH OR EXCEED 35 MPH ADVISORY LEVEL. WINDS
WILL GRADUALLY ABATE THIS EVE...BUT COULD PICK UP AGAIN THURS
AFTN.

TEMPS TODAY MUCH COOLER THAN YESTERDAY...AND SOME PLACES MAY HAVE
THEIR HIGH FOR THE DAY EARLY THIS MORNING...WITH STEADY OR FALLING
TEMPS DURING THE AFTERNOON DEPENDING ON CLOUD COVER AND/OR PRECIP.

THE UPPER TROF WILL KEEP A MAINLY DRY N-NW FLOW ALOFT OVER CENTRAL
CA AT LEAST INTO SAT. WEAK DISTURBANCES IN THE FLOW COULD HOWEVER
PRODUCE A FEW SNOW SHOWERS OVER THE SIERRA THRU FRI. THE UPPER LOW
WILL BEGIN TO WEAKEN AND MOVE FARTHER EAST OVER THE WEEKEND. A
LARGE UPPER LONG WAVE RIDGE IN THE EAST PAC ALONG 140W WILL THEN
BEGIN TO NUDGE ITS WAY EAST. THIS WILL BRING A WARMING TREND
STARTING SAT...AND TEMPS COULD BE BACK TO NEAR SEASONAL AVERAGE
SUN AND/OR MON. MODELS DIFFER IN RIDGE STRENGTH OR LACK
OF...EARLY NEXT WEEK. BASICALLY KEPT PREV FCST OF NEAR NORMAL
TEMPS AND DRY WX INTO WED...THOUGH THERE COULD BE SOME UP AND DOWN
TRENDS FOR TEMPS.

&&

.AVIATION...
AREAS OF MVFR AND LOCAL IFR IN UPSLOPE OVER THE VALLEY FACING
SLOPES OF THE SOUTHERN SIERRA NEVADA AND TEHACHAPI MOUNTAINS.
OTHERWISE...VFR CONDITIONS WILL PREVAIL OVER THE AREA THROUGH 18Z
THURSDAY. A VIGOROUS PACIFIC WEATHER SYSTEM WILL HOWEVER BRING VERY
STRONG AND GUSTY WINDS TO THE SOUTHERN SIERRA NEVADA...KERN COUNTY
MOUNTAINS AND DESERT AREAS THROUGH 06Z THURSDAY.

&&

.AIR QUALITY ISSUES...
NONE

&&

.HNX WATCHES/WARNINGS/ADVISORIES...
HIGH WIND WARNING UNTIL 11 PM PDT THIS EVENING CAZ095-098-099.

WIND ADVISORY UNTIL NOON PDT TODAY CAZ095-098-099.

&&

PUBLIC...MV
AVN/FW...BEAN
SYNOPSIS...BSO

WEATHER.GOV/HANFORD

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