Winter Storm Watch 7, NWS Hanford, CA

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN JOAQUIN VALLEY - HANFORD CA
250 PM PDT WED APR 11 2012

.SYNOPSIS...
A LOW PRESSURE TROUGH IS EXPECTED TO MOVE THROUGH THE REGION TODAY
LIFTING OUT BY TONIGHT. COLD AIR BEHIND THIS SYSTEM WITH AFTERNOON
HEATING MAY RESULT IN AFTERNOON THUNDERSTORMS TODAY. YET ANOTHER
SYSTEM IS EXPECTED TO MOVE INTO THE AREA BY THURSDAY NIGHT THROUGH
SATURDAY.

&&

.DISCUSSION...
RAIN AND SNOW CONTINUES ACROSS THE CENTRAL CALIFORNIA INTERIOR
...WITH HAIL/HEAVY PRECIP PRODUCING THUNDERSTORMS DOMINATING THE
SAN JOAQUIN VALLEY. BASED ON THIS MORNING UPPER AIR OBSERVATIONS
AND MODEL DATA...HEAVY PRECIP AND HAIL WILL BE THE MAIN CONCERN
WITH TODAY/S THUNDERSTORM...WITH WEAK ROTATION POSSIBLY PRODUCING
A FUNNEL CLOUD BEFORE SUNSET. SPC DOES HAVE THE CWFA UNDER A
THREAT OF THUNDERSTORM ACTIVITY WHICH SUPPORTS MODEL AND
OBSERVATIONAL DATA FAVORING THE WEST SIDE OF THE SAN JOAQUIN
VALLEY FROM FRESNO COUNTY NORTH THROUGH MERCED COUNTY. DOPPLER
RADAR HAS SUPPORTED THIS ASSESSMENT WITH MUCH WEAK STORMS MOVING
THROUGH KERN COUNTY. WHILE THE CURRENT STORMS CONTINUE TO MOVE
TOWARD THE EAST SIDE OF THE VALLEY...NEW STORMS ARE DEVELOPING ON
THE WEST SIDE OF THE VALLEY. DUE TO CONTINUED PRECIP OVER THE
HIGHER ELEVATIONS...WILL KEEP THE WINTER WEATHER ADVISORY IN
EFFECT UNTIL 400 PM PDT THIS AFTERNOON.

AFTER TODAY/S STORM...WILL NOW CONCENTRATE ON THE NEXT STORM THAT
IS ORIGINATING FROM A MORE GULF OF ALASKA REGION. THIS STORM HAS
THE POTENTIAL FOR TO INTRODUCE MUCH COLDER AIR INTO THE REGION AND
HIT THE DISTRICT WITH MUCH HEAVIER PRECIP. MODEL AND OBSERVATIONAL
PRECIP-WATER DATA SHOW THE NEXT STORM PUSHING A GOOD PLUME OF
MOIST AIR INTO THE REGION ON FRIDAY...ALONG WITH THE LEFT FRONT
QUAD OF A 110KT JET MAX. BY FRIDAY MORNING...500MB HEIGHT ANALYSIS
SHOWS AN GOOD DIFLUENCE FLOW OVER CENTRAL CALIFORNIA WHICH MAY
SUPPORT FOR GOOD LIFT ALONG WITH THE JET MAX DYNAMICS. MODELS PROG
GOOD PRECIP WITH THIS NEXT STORM AS OROGRAPHIC LIFT...ALONG WITH
DYNAMIC LIFT MAY PRODUCE SIGNIFICANT PRECIP AMOUNTS FROM LATE
THURSDAY NIGHT THROUGH FRIDAY AFTERNOON. MODELS AREA ALSO PROGGING
500MB TEMPS OF MINUS 30 WITH FRIDAY STORM. THESE VALUES COULD
LOWER SNOW LEVEL TO 4000 WITH LOCAL SNOW DOWN TO 3500 FEET. IN
ADDITION...THE COLD CORE SYSTEM HAS THE POTENTIAL OF SUPPORTING
CONVECTIVE DEVELOPMENT OF FRIDAY...EVEN WITH SIGNIFICANT CLOUD
COVER. WILL WAIT UNTIL AFTER TODAY/S CONVECTIVE EVENT BEFORE
ISSUING ANY STATEMENTS ON FRIDAY/S STORM.

&&

.AVIATION...
MVFR CONDITIONS WILL PREVAIL THROUGHOUT THE SOUTHERN SIERRA AND THE
TEHACHAPI MOUNTAINS THROUGH 00Z FRIDAY WITH LOCAL IFR IN SHOWERS.
LOCAL MVFR CONDITIONS IN SHOWERS WILL OCCUR IN THE SAN JOAQUIN
VALLEY AND ADJACENT FOOTHILLS WITH ISOLATED IFR IN THUNDERSTORMS
THROUGH 02Z THURSDAY. VFR CONDITIONS CAN BE EXPECTED ACROSS THE KERN
COUNTY DESERT THROUGH 00Z FRIDAY.

&&

.AIR QUALITY ISSUES...
NONE.

&&

.HNX WATCHES/WARNINGS/ADVISORIES...
WINTER WEATHER ADVISORY UNTIL 4 PM PDT THIS AFTERNOON ABOVE 6000
FEET FOR THE SOUTHERN SIERRA NEVADA /CAZ096-097/.

&&

PUBLIC...MOLINA
AVN/FW...DCH
SYNOPSIS...BSO

WEATHER.GOV/HANFORD

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PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN JOAQUIN VALLEY CA
313 PM PDT WED APR 11 2012

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0212 PM     HAIL             HANFORD                 36.33N 119.65W
04/11/2012  M0.50 INCH       KINGS              CA   NWS EMPLOYEE

            DIME-SIZED HAIL FOR ABOUT 2 MINUTES

&&

BSO

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN JOAQUIN VALLEY CA
315 PM PDT WED APR 11 2012

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0240 PM     HAIL             TULARE                  36.20N 119.34W
04/11/2012  E0.25 INCH       TULARE             CA   PUBLIC

            ABOUT 2 INCHES DEEP ON ROAD NEAR RD 60 AND AVE 240

&&

BSO

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PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN JOAQUIN VALLEY CA
515 PM PDT WED APR 11 2012

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0324 PM     HAIL             7 N VISALIA             36.43N 119.32W
04/11/2012  M1.00 INCH       TULARE             CA   NWS EMPLOYEE

            AROUND 1/2 INCH TO 1 INCH DIAMETER HAIL. ALSO ABOUT 7 MI
            EAST OF TRAVER AND 99

&&

BOCH

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE SAN JOAQUIN VALLEY CA
603 PM PDT WED APR 11 2012

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1211 PM     HAIL             HANFORD                 36.33N 119.65W
04/11/2012  M0.25 INCH       KINGS              CA   NWS EMPLOYEE

1245 PM     HAIL             4 N HANFORD             36.38N 119.65W
04/11/2012  M0.25 INCH       KINGS              CA   NWS EMPLOYEE

0100 PM     FUNNEL CLOUD     HANFORD                 36.33N 119.65W
04/11/2012                   KINGS              CA   LAW ENFORCEMENT

            SEEN FROM NORTHEAST SIDE OF TOWN BY KINGS COUNTY SHERRIFF
            DEPUTY. NEAR GRANGEVILLE BLVD.

0131 PM     HAIL             1 N RIVERDALE           36.45N 119.87W
04/11/2012  E1.00 INCH       FRESNO             CA   TRAINED SPOTTER

            ON HIGHWAY 41 HAIL COVERING THE GROUND.

0140 PM     HAIL             RIVERDALE               36.43N 119.87W
04/11/2012  M0.50 INCH       FRESNO             CA   NWS EMPLOYEE

            MAINLY 1/4 TO 1/2 INCH SIZE HAIL

0203 PM     HAIL             HANFORD                 36.33N 119.65W
04/11/2012  M1.00 INCH       KINGS              CA   NWS EMPLOYEE

0206 PM     HAIL             KINGSBURG               36.52N 119.56W
04/11/2012  E0.75 INCH       FRESNO             CA   NWS EMPLOYEE

0210 PM     HAIL             4 S KINGSBURG           36.46N 119.56W
04/11/2012  M0.88 INCH       KINGS              CA   TRAINED SPOTTER

            2 TO 3 INCHES DEEP OF HAIL ON ROAD NEAR 4TH AVE AND
            DENVER. UP TO NICKEL SIZE HAIL.

0210 PM     HAIL             5 N HANFORD             36.40N 119.65W
04/11/2012  E1.00 INCH       KINGS              CA   NWS EMPLOYEE

0210 PM     HAIL             HANFORD                 36.33N 119.65W
04/11/2012  M0.75 INCH       KINGS              CA   NWS EMPLOYEE

            UP TO PENNY SIZE HAIL ON EAST SIDE OF TOWN.

0212 PM     HAIL             HANFORD                 36.33N 119.65W
04/11/2012  M0.50 INCH       KINGS              CA   NWS EMPLOYEE

            DIME-SIZED HAIL FOR ABOUT 2 MINUTES

0216 PM     HAIL             HANFORD                 36.33N 119.65W
04/11/2012  E0.50 INCH       KINGS              CA   TRAINED SPOTTER

0220 PM     HAIL             5 SE KINGSBURG          36.47N 119.49W
04/11/2012  M1.00 INCH       TULARE             CA   TRAINED SPOTTER

0222 PM     HAIL             10 NE HANFORD           36.43N 119.53W
04/11/2012  M1.00 INCH       KINGS              CA   NWS EMPLOYEE

            SOME ACCUMULATION ON THE ROADS

0240 PM     FUNNEL CLOUD     6 SE KINGSBURG          36.46N 119.48W
04/11/2012                   TULARE             CA   TRAINED SPOTTER

0240 PM     HAIL             TULARE                  36.20N 119.34W
04/11/2012  E0.25 INCH       TULARE             CA   PUBLIC

            ABOUT 2 INCHES DEEP ON ROAD NEAR RD 60 AND AVE 240

0324 PM     HAIL             7 N VISALIA             36.43N 119.32W
04/11/2012  M1.00 INCH       TULARE             CA   NWS EMPLOYEE

            AROUND 1/2 INCH TO 1 INCH DIAMETER HAIL. ALSO ABOUT 7 MI
            EAST OF TRAVER AND 99

&&

DS