Wind Advisory 28, NWS Hanford, CA

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN JOAQUIN VALLEY - HANFORD CA
300 PM PST SUN DEC 6 2009

.SYNOPSIS...
A LOW PRESSURE SYSTEM WILL MOVE OVER THE AREA TONIGHT. THIS SYSTEM
WILL BRING COLD AIR ALONG WITH VALLEY RAIN...MUCH COOLER
TEMPERATURES AND LOW ELEVATION SNOWFALL BELOW THE PASSES AND INTO
THE FOOTHILLS EARLY MONDAY MORNING THROUGH MONDAY NIGHT FOR THE SAN
JOAQUIN VALLEY.

&&

.DISCUSSION...
THE FOCUS THIS AFTERNOON CONTINUES TO BE ON THE STORM FORECAST TO
REACH THE HANFORD WARNING/FORECAST AREA TONIGHT. THE 18Z NAM-12 IS
IN...AND DELAYS THE ARRIVAL OF THE COLDEST LOW-LEVEL AIR INTO THE
MERCED AREA UNTIL 00Z TUESDAY /WITH THE WET-BULB ZERO LINE NEAR THE
VALLEY FLOOR/...BUT STILL BRINGS IT DOWN TO FRESNO BY 09Z TUESDAY.
IF THIS IS CORRECT...RAIN OVER THE NORTHERN PART OF THE CENTRAL
VALLEY ZONES MIGHT NOT CHANGE OVER TO SNOW OR A RAIN/SNOW MIX UNTIL
THE EVENING COMMUTE. WILL KEEP THE CURRENT TIMING OF THE WINTER
WEATHER ADVISORY FOR NOW...AS ANY ACCUMULATIONS OF SNOW ON THE
VALLEY FLOOR MAY MAKE TRAVEL TREACHEROUS.

MODEL QPF GIVES TEHACHAPI AROUND AN INCH LIQUID EQUIVALENT. WITH THE
SNOW LEVEL LOWERING TO AROUND 3500 FEET...THERE WILL BE SEVERAL
INCHES ACCUMULATION ON THE PASSES HINDERING TRAVEL BETWEEN THE SAN
JOAQUIN VALLEY AND THE SOUTHLAND OR THE INDIAN WELLS VALLEY. THE
WINTER STORM WARNING FOR THE SOUTHERN SIERRA NEVADA AND THE
TEHACHAPI MOUNTAINS LOOKS ON TRACK.

THE NEXT CONCERN IS THE WIND DEVELOPING IN THE KERN COUNTY DESERTS
AHEAD OF THE FRONT. WINDS AT EDWARDS AFB HAVE ALREADY GUSTED TO 37
KTS...AND LIKELY WILL INCREASE THIS EVENING. HAVE ISSUED A WIND
ADVISORY FOR THE KERN COUNTY DESERTS FOR 00-08Z MONDAY...AND MAY
NEED ANOTHER ADVISORY FOR MONDAY NIGHT WITH THE POST-FRONTAL WINDS.

ALSO FOR MONDAY NIGHT...THE VERY COLD AIRMASS WILL POOL OVER THE SAN
JOAQUIN VALLEY. BOTH THE 12Z AND 18Z NAM-12 RUNS BROUGHT THE WET-
BULB ZERO LINE TO NEAR THE SURFACE AT FRESNO BY 09Z TUESDAY. LOWS IN
THE MID 20S WILL BE WIDESPREAD ACROSS THE RURAL PARTS OF THE
CENTRAL AND SOUTH VALLEY AND A FREEZE WATCH REMAINS IN PLACE FOR
TUESDAY MORNING.

THERE WILL BE A BREAK IN THE PRECIPITATION TUESDAY AND WEDNESDAY AS
A HIGHLY-AMPLIFIED RIDGE PIVOTS INTO CALIFORNIA BETWEEN TROUGHS. THE
NEXT TROUGH UNDERCUTS THE RIDGE WEDNESDAY EVENING...WITH THE GFS
BRINGING PRECIPITATION TO YOSEMITE BETWEEN 06-12Z THURSDAY. THIS
LOOKS TO BE A WARMER SYSTEM...WITH 850-MB TEMPERATURES REMAINING
ABOVE ZERO C.

THE THIRD STORM IS FORECAST TO MOVE INTO CALIFORNIA SATURDAY AND
SATURDAY NIGHT...BUT THE NEWEST RUNS CONTINUE THE TREND OF
WEAKENING THIS SYSTEM. WILL HAVE TO WATCH THE EVOLUTION OF THIS
SYSTEM OVER THE NEXT SEVERAL DAYS.

DATES FOR MEASURABLE SNOW IN BAKERSFIELD AND FRESNO...
/AMOUNTS IN INCHES/

BAKERSFIELD                    FRESNO

DECEMBER 11 1932...4.0         JANUARY 12 1930....2.5
JANUARY 25 1999....3.0         JANUARY 22 1962....1.5
MARCH 17 1922......2.5         DECEMBER 28 1911...1.5
MARCH 8 1974.......1.5         DECEMBER 20 1968...1.2
                               JANUARY 21 1962....0.7
                               JANUARY 1 1910.....0.6
                               DECEMBER 20 1998...0.5
                               JANUARY 1 1916.....0.5
                               MARCH 23 1929......0.2
                               JANUARY 10 1916....0.2
                               DECEMBER 24 1916...0.1
                               MARCH 23 1916......0.1

&&

.AVIATION...
A COLD STORM SYSTEM TRACKING THROUGH THE REGION WILL SPREAD AREAS
OF MVFR AND LOCAL IFR CONDITIONS IN RAIN AND HIGHER ELEVATION SNOW
ACROSS INTERIOR CENTRAL CALIFORNIA BETWEEN 03Z THIS EVENING AND
00Z TUESDAY. FREEZING/FROZEN PRECIPITATION COULD FALL AS LOW AS
THE VALLEY FLOOR IN THE MERCED AREA BY MONDAY AFTERNOON.

&&

.AIR QUALITY ISSUES...
NONE.

&&

.HNX WATCHES/WARNINGS/ADVISORIES...
WIND ADVISORY UNTIL MIDNIGHT PST TONIGHT FOR THE KERN COUNTY
DESERTS /CAZ098-099/.

FREEZE WATCH FROM LATE MONDAY NIGHT THROUGH TUESDAY MORNING FOR
THE CENTRAL AND SOUTHERN SAN JOAQUIN VALLEY /CAZ089>092/.

WINTER WEATHER ADVISORY FROM 4 AM TO 10 PM PST MONDAY FOR THE
CENTRAL SAN JOAQUIN VALLEY /CAZ089-090/.

WINTER STORM WARNING FROM 4 AM MONDAY TO MIDNIGHT PST MONDAY
NIGHT FOR THE FOOTHILLS AND HIGHER ELEVATIONS OF THE SOUTHERN
SIERRA NEVADA AND THE TEHACHAPI MOUNTAINS /CAZ093>097/.

&&

PUBLIC...SANGER
AVN/FW...JEB
SYNOPSIS...TLM

WEATHER.GOV/HANFORD

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