Area Forecast Discussion
Issued by NWS Sacramento, CA

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FXUS66 KSTO 252146

Area Forecast Discussion
National Weather Service Sacramento CA
246 PM PDT Tue Apr 25 2017

Weak weather systems will bring light precipitation through
Wednesday. Gusty north winds develop late in the week.


Dry weather persists across most of interior Northern California
as a shortwave ridge nudges into the region. A few showers are
moving through the far northern portions of the state as warm
advection starts to take hold. Under partly cloudy skies, Central
Valley locations have warmed into the upper 60s to lower 70s, with
40s to 60s over the mountains.

A series of weak weather systems will pass through the region
tonight through Wednesday. Only light precipitation totals are
expected with these systems and should occur mainly over the
mountains. The timeframe of most widespread precipitation should
occur during the day Wednesday.

After these systems pass by, a longwave trough will deepen over
the Great Basin in an "inside slider" pattern. This is
traditionally a favorable pattern for breezy north winds across
Northern California. At this stage it looks like wind gusts in
the range of 30-40 mph will be possible Thursday through Friday in
the Valley...strongest in the San Joaquin Valley.



High amplitude upper ridging in the EPAC extends over Interior
NorCal through the weekend resulting in dry conditions with above
normal temperatures. Breezy northerly winds from Friday continue
into Saturday. Ridging weakens over northern portions of CA Monday
as a short wave trough digs through the PACNW into the Great
Basin. This will result in minor cooling over northern portions of
the forecast area. High pressure rebuilds behind the wave Monday
night into Tuesday resulting in a return of breezy northerly wind.
Low level CAA with this flow will offset downslope warming and
maintain slightly cooler temps of northern portions Tuesday.



North winds to 25 mph over the San Joaquin valley into the
evening...then generally light winds through Wednesday morning.
Scattered light showers over the northern Sacramento valley after
11 pm.



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