Special Weather Statement, NWS Sacramento, CA

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SACRAMENTO CA
416 PM PDT SUN MAR 31 2013

.SHORT TERM DISCUSSION...

UPPER LEVEL LOW IS MOVING ONSHORE WITH SCATTERED SHOWERS AND
THUNDERSTORMS DEVELOPING IN THE VALLEY. MOST OF THE THUNDERSTORM
ACTIVITY HAS BEEN ON THE WEST SIDE OF THE VALLEY...WITH THE
STRONGEST STORMS IN THE NORTHERN SAN JOAQUIN VALLEY AND THE DELTA.
THAT AREA IS CLOSEST TO THE COOL AIR ASSOCIATED WITH THE CORE OF
THE LOW AND WITH A VORT MAX. CURRENTLY THE STRONGEST STORM WAS LOCATED
JUST SOUTH OF STOCKTON IN MANTECA WHICH HAS RECEIVED HALF INCH
HAIL COVERING THE GROUND. ANOTHER STORM WAS LOCATED NEAR
VACAVILLE/FAIRFIELD.

SO FAR THE LACK OF SHEAR HAS BEEN A MAJOR LIMITING FACTOR IN
PREVENTING STRONGER AND MORE WIDESPREAD STORMS. THE EASTERN SIDE
OF THE VALLEY INCLUDING THE SACRAMENTO METRO AREA HAS SEEN LIMITED
ACTIVITY SO FAR. A NOTABLE EXCEPTION TO THIS WAS A FUNNEL CLOUD
WHICH WAS SITED AND PHOTOGRAPHED IN THE TOWN OF NICOLAUS, SUTTER
COUNTY. THE CONVECTIVE AREA SHOULD SHIFT A LITTLE FURTHER EASTWARD
AS THE LOW MOVES INLAND SO AREAS TO THE EAST AND NORTH SHOULD SEE
SOME STORMS FORMING.

MAIN ISSUES INTO THIS EVENING CONTINUE TO BE HEAVY RAIN AND SOME
SMALL HAIL WITH THUNDERSTORMS IN THE VALLEY AND DELTA. SHOWERS
CONTINUE IN THE SIERRA AND FOOTHILLS WITH OCCASIONAL SMALL HAIL
AND SNOW SHOWERS ABOVE 6500 FEET. SNOW ACCUMULATIONS SHOULD BE
LIGHT AND FOCUSED OVER HIGHER ELEVATIONS.

THUNDERSTORM ACTIVITY WILL GRADUALLY DIE DOWN IN THE EARLY EVENING WITH
SOME SCATTERED SHOWERS POSSIBLE OVERNIGHT. THE LOW SLOWLY
WEAKENS AND EXITS EASTWARD ON MONDAY. THERE WILL BE SUFFICIENT
INSTABILITY AND MOISTURE REMAINING TO KEEP A SLIGHT CHANCE OF
SHOWERS FOR THE VALLEY WITH MOST ACTIVITY CENTERED OVER THE
MOUNTAINS.

DRY AND INCREASINGLY WARM WEATHER IS EXPECTED FOR TUESDAY AND
WEDNESDAY. EK

.EXTENDED DISCUSSION (THURSDAY THROUGH SUNDAY)

UNSETTLED WEATHER PATTERN EXPECTED IN THE EXTENDED FORECAST FROM
THURSDAY INTO THE WEEKEND. A WEAK TROUGH SHOULD MOVE INTO NORCAL
BY THURSDAY LATE MORNING/AFTERNOON BRINGING A CHANCE OF
PRECIPITATION TO MOST OF NORCAL. BY FRIDAY THERE COULD BE SOME
LINGERING SHOWERS BUT OVERALL A LOWER PROBABILITY OF PRECIP.
GENERAL TROUGH PATTERN PERSISTS OVER NORCAL INTO THE WEEKEND
MAINTAINING A CHANCE OF RAIN/SNOW FOR OUR CWA. SNOW LEVELS LOOK
LIKE THEY WILL BE 7000 FT OR HIGHER AND THEN DROP TO AROUND 4500
FT BY SUNDAY.  JBB

&&

.AVIATION...

MULTIPLE SMALL CONVECTIVE CELLS HAVE BEEN POPPING UP ACROSS OUR
CWA THIS AFTERNOON WITH LIGHTNING STRIKES. TAF SITES ARE CURRENTLY
AT VFR CONDITIONS BUT MAY HAVE BRIEF PERIODS OF MVFR/IFR SHOULD
ONE OF THESE CELLS DEVELOP NEARBY. WINDS ARE GENERALLY LIGHT
SOUTHERLY IN THE VALLEY WITH OCCASIONAL MODERATE GUSTS UP TO 20
KTS NEAR KRBL VCNTY. A MIX OF VFR/MVFR CONDITIONS ACROSS THE
MOUNTAINS WITH SNOW LEVELS AROUND 6000 FEET OR HIGHER TONIGHT.
SHOWERS EXPECTED TO TAPER OFF TONIGHT/EARLY MONDAY.  JBB

&&

.STO WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SACRAMENTO CA
618 AM PDT SUN MAR 31 2013

CAZ013>019-063-064-066>069-010130-
SHASTA LAKE AREA / NORTHERN SHASTA COUNTY-
BURNEY BASIN / EASTERN SHASTA COUNTY-NORTHERN SACRAMENTO VALLEY-
CENTRAL SACRAMENTO VALLEY-SOUTHERN SACRAMENTO VALLEY-
CARQUINEZ STRAIT AND DELTA-NORTHERN SAN JOAQUIN VALLEY-
MOUNTAINS SOUTHWESTERN SHASTA COUNTY TO NORTHERN LAKE COUNTY-
CLEAR LAKE/SOUTHERN LAKE COUNTY-
NORTHEAST FOOTHILLS/SACRAMENTO VALLEY-MOTHERLODE-
WESTERN PLUMAS COUNTY/LASSEN PARK-
WEST SLOPE NORTHERN SIERRA NEVADA-
618 AM PDT SUN MAR 31 2013

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHERN
CALIFORNIA.

.DAY ONE...TODAY AND TONIGHT

RAIN AND SNOW SHOWER ACTIVITY WITH A POTENTIAL FOR THUNDERSTORMS.
SOME OF THE THUNDERSTORMS COULD PRODUCE SMALL HAIL TODAY. LOCAL
URBAN AND SMALL STREAM FLOODING IS POSSIBLE IN STRONGER
THUNDERSTORMS. SNOWFALL FROM 2-5 INCHES IS POSSIBLE ABOVE 6500
FEET.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

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SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SACRAMENTO CA
441 PM PDT SUN MAR 31 2013

CAZ017-010015-
YOLO CA-SOLANO CA-
441 PM PDT SUN MAR 31 2013

THE NATIONAL WEATHER SERVICE IN SACRAMENTO HAS ISSUED A

SIGNIFICANT WEATHER ADVISORY FOR...
  CENTRAL YOLO COUNTY IN CENTRAL CALIFORNIA
  NORTH CENTRAL SOLANO COUNTY IN WESTERN CALIFORNIA

UNTIL 515 PM PDT

AT 432 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A A
BROAD AREA OF STRONG THUNDERSTORMS NEAR DIXON..MOVING NORTH AT 25
MPH. THIS AREA IS MOVING NORTH IMPACTING I-80 AND I-505 CREATING
HAZARDOUS DRIVING CONDITIONS. IF THREATENING WEATHER APPROACHES
MOTORISTS SHOULD SLOW DOWN AND INCREASE FOLLOWING DISTANCES. ROADWAY
FLOODING AND OF LOW LYING AREAS AND HAIL COVERED ROADS WILL BE
POSSIBLE.

HAIL UP TO ONE-HALF INCH IN DIAMETER IS EXPECTED WITH THIS
STORM...ALONG WITH HEAVY RAIN. THE STORM SHOULD CLEAR THE I-80 AREA
BETWEEN VACAVILLE AND DAVIS BY 450 PM BUT STILL IMPACT I-505 THROUGH
515 PM.

THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND
TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL
INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE.

LAT...LON 3862 12207 3865 12171 3843 12171 3834 12195
TIME...MOT...LOC 2335Z 179DEG 25KT 3850 12184

RB

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SACRAMENTO CA
449 PM PDT SUN MAR 31 2013

CAZ019-010045-
STANISLAUS CA-SAN JOAQUIN CA-
449 PM PDT SUN MAR 31 2013

THE NATIONAL WEATHER SERVICE IN SACRAMENTO HAS ISSUED A

SIGNIFICANT WEATHER ADVISORY FOR...
  SOUTHEASTERN SAN JOAQUIN COUNTY IN CENTRAL CALIFORNIA
  CENTRAL STANISLAUS COUNTY IN CENTRAL CALIFORNIA

UNTIL 545 PM PDT

AT 445 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM NEAR SALIDA..MOVING NORTHEAST AT 15 MPH.

HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 40 MPH ARE
EXPECTED WITH THIS STORM...ALONG WITH FREQUENT DANGEROUS LIGHTNING.
HEAVY DOWNPOURS MAY CAUSE ROADWAY FLOODING.

LOCATIONS IMPACTED INCLUDE...
   SALIDA AND  MODESTO...
   RIPON...
   MANTECA...
   RIVERBANK...
   ESCALON...
   OAKDALE...

LAT...LON 3797 12119 3784 12078 3743 12108 3755 12136
TIME...MOT...LOC 2348Z 203DEG 15KT 3766 12112

DANG