Severe Thunderstorm Warning 4, NWS Hanford, CA

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN JOAQUIN VALLEY - HANFORD CA
900 AM PST WED FEB 20 2008

.DISCUSSION...DEEP MOISTURE ASSOCIATED WITH AN UPPER LOW PRESSURE
CENTER CURRENTLY CENTERED OVER THE BAY AREA BROUGHT A GOOD SUPPLY
OF RAINFALL TO OUR AREA OVERNIGHT. MOST REPORTING STATIONS IN THE
CENTRAL AND SOUTH VALLEY HAVE PICKED UP BETWEEN A QUARTER AND
HALF AN INCH OF RAINFALL WITH SOME HIGHER ELEVATION LOCATIONS
PICKING UP NEARLY THREE QUARTERS OF AN INCH OF LIQUID EQUIVALENT.
SNOW LEVELS WERE BETWEEN 5500 AND 6000 FEET OVERNIGHT AND ARE
EXPECTED TO LOWER AROUND 500 FEET AS SOME CAA TAKES PLACE BEHIND
THE LOW AS IT MOVES OVER OUR ARE LATER THIS MORNING THEN EAST OF
OUR AREA BY THIS AFTERNOON. KHNX 88D IS INDICATING SCATTERED
SHOWERS OVER OUR AREA WITH THE GREATEST COVERAGE OVER THE SOUTHERN
SIERRA NEVADA MOUNTAINS EAST OF KINGS CANYON. EXPECT SNOWFALL
TOTALS FROM THIS SYSTEM TO REMAIN BELOW ADVISORY CRITERIA BUT
WOULD NOT BE SURPRISED TO SEE SOME LOCATIONS IN THE HIGHER
ELEVATIONS PICK UP ANOTHER 2 TO 3 INCHES OF NEW SNOWFALL. OF
GREATER CONCERN TODAY IS STRENGTHENING SURFACE P-GRADS LATER THIS
AFTERNOON AS THE BACK SIDE OF THE LOW MOVES OVER THE KERN
MOUNTAINS AND DESERTS. 12Z WRF INDICATING P-GRADS UP TO 6.5 MB
BETWEEN KBFL AND KDAG WHICH WILL SUPPORT LOCALIZED WIND GUSTS NEAR
ADVISORY CRITERIA...ESPECIALLY NEAR WIND PRONE AREAS SUCH AS
MOJAVE AND BEAR VALLEY. FOR NOW HAVE DECIDED TO HOLD OFF ON
ISSUING AN ADVISORY AND WILL USE NOWCASTS TO EMPHASIZE LOCALLY
STRONG WINDS...BUT WILL MONITOR THE SITUATION CAREFULLY AS THE DAY
MOVES ALONG. TEMPS LOOKS TO BE ON TRACK TO REACH FORECASTED MAX/S
TODAY AND AM NOT PLANNING ANY UPDATES THIS MORNING. WILL INSTEAD
USE NOWCASTS TO HIGHLIGHT THE SHOWER ACTIVITY IN THE VALLEY AND
FOOTHILL AREAS. 12Z WRF/NGM/GFS ALL INDICATE SHORTWAVE RIDGING
OVER CA TONIGHT WHICH WILL BRING A BREAK IN THE PRECIPITATION TO
OUR AREA BEFORE ANOTHER SHORTWAVE SYSTEM SPREADS MOISTURE AND UVM
INTO OUR AREA BY THURSDAY AFTERNOON FOR ANOTHER ROUND OF RAIN AND
HIGHER ELEVATION SNOW WHICH WILL AFFECT OUR AREA THROUGH FRIDAY
THEN A POTENTIALLY STRONGER SYSTEM PUSHES THROUGH THE AREA LATE
SATURDAY THROUGH SUNDAY EVENING. MEDIUM RANGE PROGS ARE IN GOOD
AGREEMENT IN BUILDING A DRY UPPER RIDGE OVER OUR AREA ON MONDAY
WHICH WILL BRING DRY AND MILD CONDITIONS TO OUR AREA THROUGH AT
LEAST THE MIDDLE OF NEXT WEEK.

&&

.AVIATION...SCATTERED SHOWERS MOVING THROUGH CENTRAL CALIFORNIA WILL
KEEP MVFR AND LOCAL IFR CIGS AND VSBYS TO THE SAN JOAQUIN VALLEY
AND ADJACENT FOOTHILLS THROUGH 20Z...THEN IMPROVING TO VFR. LOCAL
MVFR CONDITIONS IN FOG ARE POSSIBLE FROM 08Z TO 18Z THURSDAY.

IN THE MOUNTAINS...MVFR WITH AREAS OF IFR CIGS AND VSBYS IN
PRECIPITATION WILL CONTINUE THROUGH 03Z THURSDAY BEFORE IMPROVING.

&&

.AIR QUALITY ISSUES...NONE.

&&

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

&&

PUBLIC: DS
AVIATION/FIRE WX: MENDENHALL

WEATHER.GOV/HANFORD

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SAN JOAQUIN VALLEY - HANFORD CA
312 AM PST WED FEB 20 2008

CAZ089>092-211200-
WEST CENTRAL SAN JOAQUIN VALLEY-EAST CENTRAL SAN JOAQUIN VALLEY-
SOUTHWESTERN SAN JOAQUIN VALLEY-SOUTHEASTERN SAN JOAQUIN VALLEY-
312 AM PST WED FEB 20 2008

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE CENTRAL AND SOUTHERN
SAN JOAQUIN VALLEY.

.DAY ONE...TODAY AND TONIGHT

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS TO THE SAN JOAQUIN VALLEY NATIONAL WEATHER SERVICE
OFFICE.

SPOTTER ACTIVATION WILL NOT BE NEEDED.

TLM

WEATHER.GOV/HANFORD

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