000
FXUS66 KSTO 191116
AFDSTO

AREA FORECAST DISCUSSION 
NATIONAL WEATHER SERVICE ----- ( SACRAMENTO CA
)  
416 AM PDT SUN MAY 19 2013

.SHORT TERM DISCUSSION  


WARMER TEMPERATURES TODAY AND TOMORROW WITH HIGH PRESSURE
BUILDING OVER THE AREA. TEMPERATURES ARE EXPECTED TO WARM UP A FEW
DEGREES COMPARED TO YESTERDAY BRINGING TEMPERATURES IN THE MID TO
UPPER 80S IN THE VALLEY AND LOW 60S TO LOW 70S IN THE MOUNTAINS.
MONDAY SHOULD BE EVEN WARMER AS 850 MB TEMPERATURES RISE TO AROUND
18 DEG C WITH THE RIDGE AXIS OVER THE AREA. TEMPERATURES WILL BE IN
THE LOW 90S IN THE VALLEY AND 70S IN THE MOUNTAINS MONDAY
AFTERNOON.

BREEZY AND GUSTY NORTHERLY WINDS ARE EXPECTED TODAY
AS SURFACE HIGH PRESSURE BUILDS INTO THE PACIFIC NORTHWEST. MFR-
SAC GRADIENT HAS INCREASED TO ABOUT 9 MB AT 3 AM AND IS EXPECTED
TO INCREASE TO AROUND 10 MB AROUND 8 AM THIS MORNING. THIS SHOULD
BRING NORTHERLY WINDS OF 15 TO 25 MPH IN THE VALLEY. LOCAL WRF
SHOWS 925 MB WINDS AROUND 30 KTS SO GUSTS ARE EXPECTED TO BE BELOW
40 MPH. THE GRADIENT SHIFTS MORE NORTHEASTERLY TONIGHT AS THE
SURFACE HIGH MOVES INTO THE GREAT BASIN. THIS WILL BRING BREEZY
AND GUSTY WINDS TO SW-NE ORIENTED CANYONS AND GAPS ALONG THE
SIERRA AND ALONG THE WEST SIDE OF THE SACRAMENTO VALLEY AND OVER
LAKE COUNTY. GRADIENTS SHOULD WEAKEN MONDAY AFTERNOON FOR LIGHTER
WINDS. GRADIENTS BECOME MORE WESTERLY LATE MONDAY INTO TUESDAY BRINGING
ONSHORE FLOW.

COOLER TEMPERATURES AND ONSHORE FLOW ARE EXPECTED TUESDAY AS A LOW
MOVES TO THE PACIFIC NORTHWEST COAST. TEMPERATURES WILL COOL DOWN
INTO THE UPPER 70S TO MID 80S IN THE VALLEY AND 60S IN THE MOUNTAINS.

A TROUGH REMAINS OVER THE AREA INTO THE MEMORIAL DAY WEEKEND
BRINGING BELOW NORMAL TEMPERATURES AND A THREAT OF PRECIPITATION
TO THE NORTHERN SACRAMENTO VALLEY AND SURROUNDING MOUNTAINS.
TEMPERATURES ARE EXPECTED TO COOL INTO THE 70S IN THE VALLEY AND
50S IN THE MOUNTAINS WEDNESDAY THROUGH FRIDAY WHICH IS ABOUT 5 TO
10 DEGREES BELOW NORMAL FOR MID MAY. TEMPERATURES MAY INCREASE TO
NEAR NORMAL WITH TEMPERATURES IN THE LOW TO MID 80S IN THE VALLEY
AND UPPER 50S TO UPPER 60S IN THE MOUNTAINS FOR THE WEEKEND WITH A
BROAD TROUGH OVER THE AREA. ALTHOUGH THERE IS STILL VARIABILITY
IN THE STRENGTH AND TIMING OF WAVES MOVING AROUND THE LOW LEADING
TO UNCERTAINTY IN THE TIMING AND EXTENT OF SHOWERS AND AFFECTING
TEMPERATURES. THE BEST CHANCE OF PRECIPITATION WILL BE OVER
SHASTA COUNTY. THE FORECAST HAS A SLIGHT CHANCE OF SHOWERS
TUESDAY NIGHT THROUGH SATURDAY OVER THE NORTHERN MOUNTAINS AND THE
NORTHERN SACRAMENTO VALLEY AT TIMES AS WAVES BRUSH BY THE AREA.




.AVIATION 


VFR CONDITIONS CONTINUE OVER INTERIOR NORCAL NEXT 24 HOURS. NORTH
WINDS WILL INCREASE IN THE CENTRAL VALLEY THIS MORNING...  WITH
LOCAL GUSTS OVER 30KTS IN THE AFTERNOON. STRONGEST IN SAC VALLEY
WESTWARD OF SAC RIVER. WALNUT GROVE TOWER MEASURES NORTH WINDS 25
TO 35 MPH BETWEEN FL010 AND FL016 AT 1030Z. WINDS WEAKEN TONIGHT.
JCLAPP



.STO   WATCHES/WARNINGS/ADVISORIES    
NONE.