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FXUS66 KSTO 241155

355 AM PST Mon Nov 24 2014

High pressure strengthens as it moves into the West Coast today
and brings mild weather through Thanksgiving with above normal
temperatures. Rain will likely return to the region by

Patchy fog started developing around 1:30 am from Marysville
southward to Modesto. Visibilities have oscillated for the past 2
hours ranging from only 1/4 mile up to 5 miles. Dense fog seems to
be very spotty and not widespread so have not issued any dense fog
advisories at this point. We expect this patchy fog to continue
through sunrise so valley motorists between Marysville and Modesto
should be ready to slow down and drive with caution should they
encounter fog during early morning hours.

The high pressure ridge that developed over the Eastern Pacific
Ocean is edging towards the west coast and will move inland today
into Tuesday then continue to track eastward until it weakens
Thursday and Friday. This ridging pattern will bring a subtle
warming trend through Wednesday with daytime highs nudging up a
degree or two each day. Valley highs will generally range in the mid
to upper 60s while higher terrain ranges low 50s to mid 60s.
Wednesday will be the warmest day this week with valley highs 5-10
degrees above normal and mountain highs 10-20 degrees above normal
for late November.

With lingering moisture from the wet pattern last week and
subsidence aloft, we still expect patchy fog development for the
next few mornings (between midnight and sunrise). Patchy fog/low
clouds are most likely from Marysville southward for valley
locations and mountain valleys may also get patchy fog.

By Thursday, Thanksgiving Day, the ridge will weaken as a storm
system offshore moves closer to the Pacific NW. This weakening
ridge will cause daytime highs to lower a bit, but the Holiday
forecast continues to look dry.  JBB

.Extended Discussion (Friday through Monday)

Models similar in spreading initial precip with a warm front into
interior NorCal on Friday as upper ridge flattens and shifts east.
Still some differences between the EC and GFS on timing the cold
front shifting inland Saturday as the models differ on when the
upstream trough will dig down from the Gulf of Alaska which will
affect impacts inland. Showery precip with lower snow levels
expected to continue into early next week as the upper trough
moves overhead.



NWly flow alf as upr rdg blds off the W Cst. VFR ovr intr NorCal
nxt 24 hrs exc lcl MVFR/IFR and isold LIFR poss in vly fog til
18Z. Lcl Nly sfc wnd gsts to 25 kts poss thru favrd cnyns and
omtns thru abt 20Z.


.STO Watches/Warnings/Advisories...


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