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000
FXUS66 KSTO 240519
AFDSTO

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SACRAMENTO CA
1019 PM PDT THU MAY 23 2013

.SHORT TERM DISCUSSION...

UPPER LOW CONTINUES TO SPIN OVER WASHINGTON AND OREGON THIS
EVENING. THIS IS KEEPING A DRY...BUT COOL NORTHWEST FLOW OVER
NORCAL. TEMPERATURES AT 10 PM ARE GENERALLY IN THE LOW 60`S AT
VALLEY LOCATIONS. THESE READINGS ARE AROUND 5 DEGREES WARMER
VERSUS YESTERDAY AT THIS TIME. FORECASTED OVERNIGHT LOWS FROM THE
UPPER 40`S TO LOW 50`S LOOK ON TRACK AND NO EVENING UPDATE WILL
BE NEEDED.

AN EARTHQUAKE WAS FELT MODERATELY BY NUMEROUS PERSONS OVER
INTERIOR NORTHERN CALIFORNIA AT 847 PM PDT. TREMORS WHERE FELT A
FEW MINUTES AFTER THE INITIAL EARTHQUAKE. DAMAGE REPORTS SO
FAR HAVE ONLY BEEN OBJECTS FALLING FROM SHELVES AND DISHES
RATTLED OR BROKEN.

ACCORDING TO CALWAS REPORTS THE EPICENTER WAS NEAR GREENVILLE IN
PLUMAS COUNTY WITH A PRELIMINARY MAGNITUDE OF 5.7.

PREVIOUS DISCUSSION...

AN UPPER LEVEL LOW IS CURRENTLY CENTERED OVER THE PACIFIC
NORTHWEST. A WEAK WAVE HAS ROTATED AROUND THE LOW INTO NORTHERN NEVADA.
THIS TOUCHED OFF A FEW SHOWERS OVER EASTERN SHASTA...LASSEN PARK AND
PLUMAS COUNTY EARLIER TODAY BUT THESE HAVE SHIFTED EASTWARD.

TEMPERATURES HAVE WARMED TO THE LOW TO MID 70S IN THE VALLEY AND
MAY SEE A COUPLE MORE DEGREES OF WARMING BEFORE DAYLIGHT ENDS.
FRIDAY HIGHS WILL INCREASE AROUND ANOTHER 5 DEGREES AND STAY ABOUT
THE SAME FOR SATURDAY. SUNDAY MAY BE A DEGREE OR SO COOLER. THESE
TEMPERATURES ARE AT NEAR TO SLIGHTLY BELOW NORMAL LEVELS.

THE WEATHER FOR TONIGHT AND FRIDAY WILL REMAIN DRY. THE NEXT
SLIGHT CHANCE OF PRECIPITATION RETURNS SATURDAY AFTERNOON INTO
SUNDAY OVER THE NORTHERN MOUNTAINS AS A WEAK SHORTWAVE ROTATES
AROUND THE LOW ACROSS NORTHERN CALIFORNIA. THIS WILL ALSO INCREASE
CLOUD COVER SOME OVER THE FORECAST AREA. INSTABILITY WITH THIS
SYSTEM MAY BE ENOUGH TO TOUCH OFF A FEW ISOLATED THUNDERSTORMS
FROM THE BURNEY BASIN THROUGH WESTERN PLUMAS COUNTY AND LASSEN
PARK SUNDAY AFTERNOON AND EVENING.  EK

&&

.EXTENDED DISCUSSION (MONDAY THROUGH THURSDAY)

A TROUGH REMAINS OVER THE WEST COAST NEXT WEEK BRINGING BELOW
NORMAL TEMPERATURES AND PERIODS OF POSSIBLE PRECIPITATION THROUGH
THE WEEK. THE MODELS ARE IN GOOD AGREEMENT WITH A DISTURBANCE
MOVING THROUGH NORTHERN CALIFORNIA ON MONDAY. THIS WILL BRING A
CHANCE OF RAIN TO INTERIOR NORTHERN CALIFORNIA ON MEMORIAL DAY.
TEMPERATURES ARE EXPECTED TO DROP TO AROUND 70 IN THE VALLEY AND
MID 40S TO MID 50S IN THE MOUNTAINS MONDAY. PRECIPITATION IS
EXPECTED TO TAPER OFF ON TUESDAY. MODELS VARY FOR THE REST OF THE
WEEK AND TIMING OF WAVES SO THERE IS UNCERTAINTY IN THE DETAILS.
FORECAST GOES WITH A CHANCE OF SHOWERS OVER NORTHERN SACRAMENTO
VALLEY AND NORTHERN MOUNTAINS AND A SLIGHT CHANCE OVER THE SIERRA
FOR WEDNESDAY AND THURSDAY WITH A POSSIBLE WAVE MOVING THROUGH THE
NORTH.

&&

.AVIATION...

GENERALLY VFR CONDITIONS FOR THE NEXT 24 HOURS WITH A LOW PRESSURE
SYSTEM OVER THE PACIFIC NORTHWEST.

&&

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

$$