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Area forecast discussion
National Weather Service Sacramento California
330 am PST Tue Feb 28 2017

Synopsis...
flooding concerns continue as runoff from recent rain continues
to work its way downstream adding stress to waterways. Dry
weather with warming trend through the end of the week.

&&

Discussion...
northwest flow and subsidence behind yesterday's trough has
resulted in clearing skies across much of the region, and showers
over northwest California have been dissipating as them move
inland. The exception is persistent clouds that remain along and
east of the Sierra/Cascade crest. Temperatures are on the chilly
side and generally range from the single digits to mid 20s in the
mountains, and 30s to lower 40s elsewhere.

High pressure will build across the region into mid-week with dry
weather. Temperatures will warm with valley highs back into the
60s by Wednesday, 50s for the foothills, and 30s and 40s across
higher elevations. Clear skies overnight will continue chilly
morning lows with perhaps a few patches of frost in the Valley.

Ridge forecast to shift east Friday as a deeper trough moves into
the Gulf of Alaska. Mid and high clouds expected to be on the
increase, though precipitation chances will likely hold off until
the weekend.

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Extended discussion (saturday through tuesday)
wet pattern returns this weekend as an upper low drops out of the
Gulf of Alaska and into the eastern Pacific. Precipitation
spreads over the north state on Saturday but remains generally
north of Interstate 80. Precipitation spreads southward on Sunday
as a frontal band pushes across the north state with all areas of
the County Warning Area under at least a threat of rain or snow. Snow levels with
this cool system will be moderate so higher passes of the Sierra
will be impacted. Still too early to estimate rain and snowfall
amounts as models vary fairly significantly on how much moisture
this system contains. Flat upper ridging builds a bit over the
west on Monday pushing and precipitation chances northward to
around Shasta County while the rest of the County Warning Area remains dry. Looks
like another round of precipitation hits norcal next Tuesday as
another Pacific storm system moves into the north state. Timing
differences exist between models so adjustments in timing and
precip amounts will be needed. Overall...daytime highs through the
extended period should be fairly close to normal.

&&

Aviation...
VFR conditions next 24 hours. Winds generally below 10 knots taf
sites.

&&

Sto watches/warnings/advisories...
Flash Flood Watch through late Thursday night for Carquinez
Strait and Delta.

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