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000
FXUS66 KSTO 131555
AFDSTO

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SACRAMENTO CA
855 AM PDT THU JUN 13 2013

.SHORT TERM DISCUSSION...
UPPER LOW TRACKING INTO THE PACNW THIS MORNING WITH ASSOCIATED
TROUGHING EXTENDING INTO CALIFORNIA. THE TROUGH WILL MOVE ACROSS
QUICKLY...PUSHING INTO THE GREAT BASIN THIS EVENING. PRECIPITATION
WITH THIS SYSTEM WILL REMAIN NORTH OF THE CWA TODAY WITH MAIN IMPACT
BEING MINOR SYNOPTIC COOLING...MORE SO ACROSS NORTHERN PORTIONS OF
CAL...WITH SOME BREEZY CONDITIONS IN THE MOUNTAINS. HIGHS TODAY
EXPECTED IN THE 80S THROUGHOUT THE CENTRAL VALLEY WITH 60S TO LOWER
80S FOR THE MOUNTAINS AND FOOTHILLS.

SURFACE HIGH PRESSURE BUILDS THROUGH OREGON INTO THE GREAT BASIN
TONIGHT INTO TOMORROW AS WEAK SHORTWAVE RIDGING MOVES INTO THE PACNW
FRIDAY. N-S SURFACE PRESSURE GRADIENT INCREASES TONIGHT WITH SOME
BREEZY NORTHERLY WIND INTO FRIDAY FOR INTERIOR NORCAL. MINOR AMS
WARMING FRIDAY WITH HIGHS FROM THE UPPER 80S TO LOWER 90S IN THE
CENTRAL VALLEY.

NEXT SYSTEM...CURRENTLY ALONG 150W...IS FORECAST TO DIG AND DEEPEN
NEAR 145W ON SATURDAY AS 100 KT JET STREAK DROPS INTO THE BACKSIDE
OF THE LOW. FEATURE THEN REMAINS QUASISTATIONARY SUNDAY INTO EARLY
MONDAY OFF THE PACNW COAST. THIS WILL RESULT IN DRY SOUTHWESTERLY
FLOW ALOFT OVER INTERIOR NORCAL WITH A COOLING TREND OVER THE
WEEKEND INTO MONDAY.

PCH

.EXTENDED DISCUSSION (MONDAY THROUGH THURSDAY)

THE UPPER LEVEL LOW OFF THE PACIFIC NORTHWEST WILL BRING BELOW
NORMAL TEMPERATURES ALONG WITH ONSHORE FLOW INTO NEXT WEEK.
TEMPERATURES ARE EXPECTED TO BE IN THE MID 70S TO MID 80S IN THE
VALLEY AND 50S TO 60S IN THE MOUNTAINS. BREEZY SOUTHWEST WINDS ARE
EXPECTED THROUGH THE DELTA AND OVER THE RIDGES. THERE IS ALSO A
SLIGHT CHANCE OF THUNDERSTORMS FOR THE MOUNTAINS OF SHASTA COUNTY
WITH THE STRONGEST DYNAMICS STAYING NORTH AND EAST OF OUR AREA. THE
SHOWER/THUNDERSTORM THREAT MAY CHANGE WITH THE TRACK OF THE LOW. THE
GFS CONTINUES TO BE A LITTLE QUICKER THAN THE ECMWF AND MOVES THE
LOW TO THE EAST BY LATE WEDNESDAY. HAVE REMOVED MOST PRECIPITATION
EXCEPT FOR FAR NORTHERN SHASTA. THURSDAY LOOKS LIKE IT COULD BE THE
START OF A DRYING AND GRADUAL WARMING TREND. EK

&&

.AVIATION...

VFR CONDITIONS ACROSS THE AREA THE NEXT 24 HOURS WITH WESTERLY FLOW
ALOFT AS AN UPPER LEVEL LOW MOVES THROUGH THE PACIFIC NORTHWEST
TODAY. WINDS GENERALLY UNDER 15 KNOTS EXCEPT WEST GUSTS TO 30 MPH
OVER RIDGES.

&&

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

$$