Area Forecast Discussion
Issued by NWS Sacramento, CA

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000
FXUS66 KSTO 291019
AFDSTO

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SACRAMENTO CA
319 AM PDT WED JUL 29 2015

.SYNOPSIS...
HOT AND DRY WEATHER TODAY AND THURSDAY WITH A SLIGHT COOLING
FRIDAY INTO NEXT WEEK. SCATTERED MOUNTAIN THUNDERSTORMS FRIDAY AND
OVER THE WEEKEND AS MONSOON MOISTURE IS PULLED
NORTHWARD...OTHERWISE CONTINUED DRY.

&&

.DISCUSSION...
UPPER LEVEL RIDGE OF HIGH PRESSURE CONTINUES TO BUILD OVER THE
WEST COAST FOR FAIR SKIES OVER THE REGION. MARINE LAYER IS
SQUASHED DOWN TO BELOW 1000 FEET WITH ONLY A WEEK DELTA BREEZE AND
ONLY SCATTERED STRATUS NEAR THE COAST SO NO COASTAL STRATUS
EXPECTED IN THE DELTA TODAY. MOST AREAS RUNNING A LITTLE WARMER
TODAY UNDER THE WARMING AIRMASS EXCEPT FOR THE NORTHERN SACRAMENTO
VALLEY WHERE LIGHTER WINDS ARE ALLOWING FOR COOLER TEMPEATURES
THIS MORNING. NORTHERLY BREEZES WILL CONTINUED TO WEAKEN TODAY AS
PRESSURE GRADIENTS RELAX. TEMPERATURES ARE FORECAST TO WARM
SLIGHTLY TODAY AS UPPER RIDGING CENTERS MORE OVER THE WEST COAST.
DAYTIME HIGHS IN THE VALLEY WILL TOP 100 AGAIN MOST LOCATIONS.
DAYTIME HIGHS WILL REACH 10 OR MORE DEGREES ABOVE NORMAL AND SOME
RECORD HIGHS COULD BE REACHED ESPECIALLY IN THE SACRAMENTO AREA
AND SOUTHWARD. A LITTLE MORE WARMING IS EXPECTED ON THURSDAY
EXCEPT POSSIBLY FOR THE DELTA AND DELTA INFLUENCED AREAS WHERE A
SLIGHT DELTA BREEZE SHOULD BEGIN TO BRING A LITTLE COOLING
THURSDAY. MAINLY FAIR SKIES ARE EXPECTED AGAIN THURSDAY EXCEPT
FOR AREAS SOUTH OF ABOUT SACRAMENTO WHICH MAY SEE A LITTLE
CLOUDINESS AS MONSOON MOISTURE BEGINS TO BE PULLED NORTHWARD INTO
THE AREA. BY FRIDAY...UPPER LEVEL RIDGING OVER THE WESTERN U.S.
AND SOUTHEAST FLOW ALOFT WILL PULL ENOUGH MONSOON MOISTURE
NORTHWARD FOR A THREAT OF THUNDERSTORMS OVER THE MOUNTAINS. A
SLIGHTLY COOLER AIRMASS AND POSSIBLY SOME PERIODS OF CLOUD COVER
WILL BRING DOWN DAYTIME HIGHS SLIGHTLY ON FRIDAY AND SATURDAY BUT
MAXIMUM TEMPEATURES WILL STILL COME IN A FEW TO SEVERAL DEGREES
ABOVE NORMAL.

&&
.EXTENDED DISCUSSION (SUNDAY THROUGH WEDNESDAY)

HIGH PRESSURE WILL GRADUALLY WEAKEN AND SHIFT EAST DURING THE
EXTENDED PERIOD AS A TROUGH DEVELOPS OFFSHORE. THIS PATTERN WILL
LIKELY SHUNT DEEPER MOISTURE AND INSTABILITY TO THE EAST OF THE
SIERRA/CASCADE CREST WITH TIME LIMITING MOUNTAIN THUNDERSTORM
CHANCES. TEMPERATURES WILL LIKELY ALSO RETURN TO NEAR AVERAGE
LEVELS FOR EARLY AUGUST AS THE AIRMASS OVER THE REGION COOLS A
BIT AND ONSHORE FLOW INCREASES.
&&

.AVIATION...

BLDG HIGH PRES WITH VFR CONDS OVR INTR NORCAL NXT 24 HRS EXC LCL
MVFR VSBY POSS VCNTY OF FIRES (LOWELL, WRAGG). LCL GSTY N-E SFC
WND POSS OVR NRN AND ERN FTHLS/MTNS TIL ABT 18Z.
&&

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

$$


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