Area Forecast Discussion
Issued by NWS Sacramento, CA

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FXUS66 KSTO 191031

Area Forecast Discussion
National Weather Service Sacramento CA
331 AM PDT Wed Oct 19 2016

Dry through the end of the week with a little above normal
temperatures. A little cooling Saturday with a chance of
precipitation spreading over the forecast area late Sunday
through mid week with a slow cooling trend.


An upper level high pressure ridge will slide over the west coast
over the next few days bringing fair skies and a little above
normal daytime temperatures. This combined with a weak northerly
surface gradient will bring light north winds to the CWA. The
upper ridge axis is forecast to shift into the Great Basin on
Friday. This will bring a shift to a more onshore flow and the
beginning of a slow cooling trend. A low pressure trough is
forecast to approach the coast on Saturday bringing a stronger
onshore push and cooler temperatures with daytime highs dropping
to a few degrees below normal. At this precipitation is
expected during the short term period but a wetter pattern may
return next week.


The trough is expected to move further inland on Sunday providing
a few more degrees of cooling and high cloud cover for our area.
By Sunday night, a chance of precipitation spreads across much of
NorCal. The broad trough will remain just offshore and rotate
energy through our area through Tuesday. Beyond this, the GFS and
ECMWF begin to diverge. They both hint at the main low moving into
Montana with a trailing trough through Oregon to NorCal, but the
GFS brings in ridging behind the front while the ECMWF develops a
cutoff low offshore by next Thursday.      JClapp



VFR conditions expected over the next 24 hours as the dry
northerly flow keeps west side of valley fog-free. Some patchy
ground fog still possible on east side of valley.    JClapp


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