Area Forecast Discussion
Issued by NWS Sacramento, CA

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FXUS66 KSTO 181647

947 AM PDT Fri Apr 18 2014

.Synopsis...A weak frontal passage will bring a isolated showers
and thunderstorms to the Sierra today. Otherwise...building high
pressure will bring fair skies and well above normal temperatures
through the remainder of the weekend. A stronger Pacific trough
will approach the coast early next week bringing increasing clouds
on Monday and a chance of rain and higher elevation snow on
Tuesday. Some areas may also see a chance of thunderstorms on
Tuesday. Weak high pressure will dry things out over the central
state by Thursday but a threat of precipitation will continue
across the north state.


.Short Term Discussion...
Another mostly sunny spring day with above normal temperatures for
Interior California today. Although with some mid level moisture
and instability over the Sierra this afternoon and evening could
see some showers and possibly isolated thunderstorms...especially
south of highway 50. Another trough moves through the Pacific
Northwest on Saturday but interior Northern California should
stay dry with above normal temperatures. Some cumulus clouds may
develop near the Sierra Crest in Alpine and Tuolumne counties in
the afternoon and evening but most of instability is to the
southeast so do not expect showers or thunderstorms at this time.
Temperatures are expected to be in the upper 70s to low 80s in the
valley and 50s and 60s in the mountains, which is about 3 to 9
degrees above normal for mid April. Temperatures warm up a little
with weak ridging ahead of a stronger system on Sunday.
Temperatures will warm into the low to mid 80s in the Valley and
mid 50s to mid 70s in the mountains. Temperatures will cool on
Monday as the trough approaches the coast bringing synoptic
cooling and onshore flow and some clouds. Temperatures are expected to
be in the mid to upper 70s in the Valley and 50s and 60s in the
mountains. Precipitation may move into the far north Monday
afternoon and then spread across the area by Tuesday morning.

.Extended Discussion (Tuesday through Friday)

Showers will continue across our CWA on Tuesday. Slight chance of
thunderstorms in the valley on Tuesday as models indicate some
instability with the passage of the upper low. Cooler temperatures
will be noticeable as valley highs lower into the mid to upper 60s
on Tuesday. Slight warming trend begins on Wednesday and continues
into Thursday as the upper low passes eastward and ridging re-
develops. Could still have some lingering showers on Wed &
Thurs...primarily over higher elevations. JBB



VFR conditions will continue today and winds will generally be
light north to northwesterly across the valley (around 10 kts).
Fairly dry weather today except for the possibility of
thunderstorms along the Sierra Crest.


.STO Watches/Warnings/Advisories...

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