000
FXUS66 KSTO 221717
AFDSTO

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SACRAMENTO CA
915 AM PST SUN NOV 22 2009

.DISCUSSION...
SYSTEM MOVING ACROSS INTERIOR NORTHERN CALIFORNIA THIS MORNING. THE
LIGHT PRECIPITATION ASSOCIATED WITH WARM ADVECTION HAS BEEN SLOWLY
DISSIPATING OVER THE PAST FEW HOURS AND WILL CONTINUE TO DO SO AS
THE SYSTEM MOVES TO OUR EAST. AT THE LOWER ELEVATIONS...
PRECIPITATION HAS REMAINED PRIMARILY TOWARDS THE NORTHERN END OF THE
VALLEY AND ALONG THE HIGHER ELEVATIONS. CLOUDS SHOULD BEGIN TO
DECREASE THIS AFTERNOON AS THE UPPER SYSTEM DEPARTS. NOT EXPECTING
ANY FORECAST UPDATES AT THIS TIME.

.PREVIOUS DISCUSSION...
RIDGING SURFACE AND ALOFT BEGINS TO TAKE HOLD TONIGHT AND CONTINUES
THROUGH MID-WEEK PROVIDING DRY AND MILD WEATHER FOR THE REGION AS
LIGHT TO MODERATE OFFSHORE FLOW DEVELOPS. MEDIUM RANGE MODELS IN
SOMEWHAT BETTER AGREEMENT WITH PATTERN LATER IN THE WEEK AS THEY
ADVERTISE ANOTHER WEAK SYSTEM DENTING THE RIDGE THANKSGIVING NIGHT
INTO FRIDAY BRINGING A CHANCE OF PRECIPITATION TO THE NORTHERN
PORTION OF THE FORECAST AREA.

&&

.AVIATION...
WK CDFNT AND UPR TROF WILL MOV ACRS INTR NORCAL TDA FLWD BY HI PRES
BLDG INLD TNGT INTO MON. FOR CNTRL VLY...AREAS OF MVFR AND LCL IFR
CONDS MNLY N OF I-80 POSS THRU 00Z THEN MNLY VFR AFT EXC AREAS
IFR/LIFR IN FOG POSS BTWN 12Z-17Z. FOR FTHLS/MTNS...WDSPRD IFR AND
LCL LIFR CONDS...MNLY N OF I-80...WITH CONDS GRDLY IMPVG AFT 03Z MON
EXC AREAS IFR/LIFR IN FOG/ST IN MTN VLYS BTWN 11Z-18Z. SN LVLS ARND
045 OVR NRN INTR MTNS...AND 050-060 OVR SIERNEV. LCL SW-NW SFC WND
GSTS TO 30 KTS OR GTR OMTNS TIL 04Z MON THEN LCL ELY SFC WND GSTS TO
30 KTS OR GTR OVR SIERNEV AFT 06Z MON TIL ARND 18Z MON.

&&

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

&&

$$