Severe Thunderstorm Warning 3, NWS Sacramento, CA

983 
WWUS56 KSTO 142239
SVSSTO

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SACRAMENTO CA
339 PM PDT MON MAY 14 2012

CAC035-089-142315-
/O.CON.KSTO.SV.W.0003.000000T0000Z-120514T2315Z/
LASSEN CA-SHASTA CA-
339 PM PDT MON MAY 14 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM PDT
FOR SOUTHEASTERN SHASTA AND EXTREME WEST CENTRAL LASSEN COUNTIES...

AT 336 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS 
LOCATED OVER LASSEN NATIONAL PARK...5 MILES SOUTH OF OLD 
STATION...OR 4 MILES NORTHEAST OF MINERAL...MOVING WEST AT 10 
MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO 
MANZANITA LAKE...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY! LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

&&

LAT...LON 4051 12163 4073 12136 4061 12131 4059 12132
      4058 12129 4054 12124 4045 12125 4045 12154
TIME...MOT...LOC 2238Z 113DEG 11KT 4060 12137

$$

EK

944 
WWUS56 KSTO 142308
SVSSTO

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SACRAMENTO CA
408 PM PDT MON MAY 14 2012

CAC035-089-142314-
/O.CAN.KSTO.SV.W.0003.000000T0000Z-120514T2315Z/
LASSEN CA-SHASTA CA-
408 PM PDT MON MAY 14 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN SHASTA AND
EXTREME WEST CENTRAL LASSEN COUNTIES IS CANCELLED...

THE STORM HAS WEAKENED AND EXITED TO THE WEST OF THE AREA AND THUS 
THE SEVERE THUNDERSTORM WARNING HAS BEEN CANCELLED. SCATTERED  
THUNDERSTORMS WITH CLOUD TO GROUND LIGHTNING STRIKES CONTINUE 
BETWEEN LASSEN NATIONAL PARK AND REDDING. BRIEF PERIODS OF HEAVY 
RAIN AND SOME SMALL HAIL ARE ALSO POSSIBLE WITH THESE STORMS.

LAT...LON 4051 12163 4073 12136 4061 12131 4059 12132
      4058 12129 4054 12124 4045 12125 4045 12154
TIME...MOT...LOC 2304Z 113DEG 11KT 4063 12147

$$

EK

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SACRAMENTO CA
1058 AM PDT MON MAY 14 2012

.SHORT TERM DISCUSSION...

A RELATIVELY COOL DAY IS EXPECTED TODAY AS A CLOSED UPPER LOW MOVES
ACROSS NORTHERN CALIFORNIA. THIS SYSTEM WILL BRING STEEP MID LEVEL
LAPS RATES COUPLED WITH DYNAMICS FROM A 75 KT JET STREAK. THIS COULD
BRING SCATTERED THUNDERSTORMS THIS AFTERNOON...MAINLY OVER THE
HIGHER MOUNTAINS OF SHASTA COUNTY...WESTERN PLUMAS COUNTY AND
LASSEN PARK. VISIBLE SATELLITE SHOWS ALTOCUMULUS FROM MID LEVEL
INSTABILITY DEVELOPING THERE NOW. LAPS ANALYSIS SHOWS CAPE
BULLSEYES AS WELL. TIMING OF THE UPPER LOW PASSAGE AND AFTERNOON
HEATING IS FAVORABLE FOR CONVECTIVE DEVELOPMENT. SOME CONVECTION
COULD CONTINUE WELL INTO THE EVENING. A SLIGHTLY MORE SOUTHERLY
TRACK OF THE UPPER LOW COULD BRING ISOLATED THUNDERSTORMS OVER THE
SIERRA CREST NORTH OF INTERSTATE 80 SO HAVE ADDED THEM TO THE
FORECAST.

STRATUS OFF THE COAST OF SAN FRANCISCO HAS MOVED INLAND WITH SOME
LIGHT RAIN REPORTED NEAR SANTA CRUZ. VISIBLE SATELLITE SHOWS THIS
LAYER ERODING AS IT SPREADS INTO THE DELTA. HAVE ADDED JUST SOME
LIGHT SPRINKLES OVER THE VALLEJO AREA. EK

.PREVIOUS DISCUSSION...INITIAL BAND OF MID AND HIGH-LEVEL
MOISTURE AHEAD OF THE UPPER LOW IS NOW ACROSS THE FAR NORTH AND
EASTERN PORTIONS OF THE FORECAST AREA. SO FAR NO
SHOWER/THUNDERSTORM ACTIVITY HAS BEEN DETECTED DUE TO THE LIMITED
MOISTURE (AROUND 1/2 INCH PW ON BLENDED SAT PRODUCT) AND ITS
HEIGHT IN THE ATMOSPHERE.

THE UPPER LOW CENTER IS STILL OFFSHORE BUT IS FORECAST TO
MOVE ONSHORE VICINITY POINT ARENA AROUND MIDDAY THEN WORK ITS WAY
ACROSS THE SAC VALLEY IN THE AFTERNOON AND EVENING. BEST COMBO OF
MOISTURE AND LIFT WILL BE ALONG THE FRINGES OF THE FORECAST
AREA...MAINLY THE HIGHER TERRAIN OF SHASTA COUNTY WHERE ISOLATED
THUNDERSTORMS WILL BE POSSIBLE MAINLY THIS AFTERNOON AND EVENING.

COOLING CONTINUES TO WORK ITS WAY INLAND IN RESPONSE TO A VERY
DEEP MARINE LAYER (NOW OVER 4K FT DEEP ON THE FORT ORD PROFILER)
AND STRONG ONSHORE PRESSURE GRADIENTS. A THIN AREA OF STRATUS HAS
SPREAD INLAND JUST TO THE SOUTH OF DOWNTOWN SACRAMENTO AND WILL
GREET EARLY MORNING COMMUTERS WITH SOME LOW CLOUDS ALONG THE
EASTERN FOOTHILLS. THE UPPER LOW/S MAIN IMPACT WILL BE COOLER
TEMPERATURES ACROSS THE REMAINDER OF THE INTERIOR OF NORCAL WITH
READINGS IN THE CENTRAL VALLEY EXPECTED TO BE IN THE 70S TO LOWER
80S WHILE THE MOUNTAINS WILL MAINLY BE IN THE 60S AND 70S.

RIDGING BUILDS OVER THE INTERIOR TUESDAY AND WEDNESDAY BRINGING
WARMER TEMPERATURES AS THE ONSHORE FLOW WEAKENS. VALLEY TEMPS ARE
EXPECTED TO MOSTLY RETURN INTO THE 80S WITH SOME LOWER 90S
POSSIBLE AT THE NORTH END OF THE VALLEY. NEXT UPPER TROUGH
APPROACHES THURSDAY WITH ANOTHER COOL DOWN. MAY SEE A FEW
AFTERNOON/EVENING THUNDERSTORMS OVER THE NORTHERN MOUNTAINS...
MAINLY WEDNESDAY AND THURSDAY.

&&

.EXTENDED DISCUSSION (FRIDAY THROUGH MONDAY)

THE UPPER LEVEL TROUGH PASSING OVER NORCAL EARLY TO MID DAY FRI.
TROUGH SHOULD BE PAST THE AREA DURING MAX HEATING, SO WE
MAINTAINED THE CLIMO POP AS THE UNDERLYING GRID FOR FRI DUE TO
SOME REMAINING INSTABILITY. FLAT WESTERLY FLOW TAKES OVER SAT
BEFORE BECOMING MORE SOUTHWESTERLY SUN AND MON AS NEXT LONGWAVE
TROUGH IS NEAR 135W. DELTA BREEZE LIKELY ON THE INCREASE SUN AND
MON WITH INCREASED RH OVER LOWER SIERRA FOOTHILLS.     JCLAPP

&&

.AVIATION...

UPPER LEVEL LOW NEAR CA COAST THIS MORN DECREASING PRESSURE
GRADIENT AND DELTA BREEZE AT KSUU. SLIVER OF STRATUS S OF KSUU
INTO SRN SAC COUNTY. MARINE LAYER HAS DEEPENED TO OVER 3 KFT, BUT
WASHING OUT AT LOWER LEVELS. EXPECT STRATUS CIG BASES 020-025 AT
KMHR AND EASTWARD TO FOOTHILLS. STRATUS CIGS LIKELY TO EXPAND TO
KMCC AND KSAC, BUT NOT AS LIKELY AT KSMF.

ISOLATED- SCATTERED TSTORMS POSSIBLE OVER INTERIOR NORCAL MTNS AS
UPPER LOW MOVES INLAND TODAY...MAINLY OVER NRN MTNS N OF THE I-80
CORRIDOR/TAHOE AREA.   JCLAPP

&&

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

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SACRAMENTO CA
405 AM PDT MON MAY 14 2012

CAZ013>019-063-064-066>069-151400-
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 TO NORTHERN LAKE COUNTIES-
CLEAR LAKE/SOUTHERN LAKE COUNTY-MOTHERLODE-
EAST FOOTHILLS/NORTH SACRAMENTO VALLEY-
WESTERN PLUMAS COUNTY/LASSEN PARK-WEST SLOPE NORTHERN SIERRA NEVADA-
405 AM PDT MON MAY 14 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR INTERIOR NORTHERN CALIFORNIA.

.DAY ONE...TODAY

ISOLATED TO SCATTERED AFTERNOON AND EVENING THUNDERSTORMS WILL BE
POSSIBLE OVER THE HIGHER TERRAIN OF MAINLY SHASTA COUNTY...
OTHERWISE NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN... TUESDAY THROUGH SUNDAY

ISOLATED AFTERNOON AND EVENING THUNDERSTORMS POSSIBLE OVER THE
HIGHER TERRAIN...OTHERWISE NO HAZARDOUS WEATHER IS EXPECTED AT THIS
TIME.

THE LATEST WEATHER INFORMATION IS AVAILABLE ON THE INTERNET AT
(LOWER CASE): HTTP://WWW.WRH.NOAA.GOV/STO