Area Forecast Discussion
Issued by NWS Sacramento, CA

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FXUS66 KSTO 251626

Area Forecast Discussion
National Weather Service Sacramento CA
926 AM 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. For the majority of our forecast
area, dry weather with partly cloudy skies will continue today.
Expect temperatures to top out around 70 degrees across the
Valley, with 40s to 60s over the mountains. These forecast
temperatures are a few degrees cooler than normal for this time of

A series of weak weather systems will pass through the region
today through Wednesday. Only light precipitation totals are
expected with these systems: mainly focused north of Interstate
80 and over the mountains.

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.



NWly flow alf with VFR conds ovr Intr NorCal nxt 24 hrs exc isold
IFR/LIFR poss in mtn vlys til arnd 17z. Lcl SWly sfc wnd gsts up
to 25 kts poss thru Delta and NW to 25 kts in Nrn San Joaquin vly
this aftn into eve. Lcl W-NW sfc wnd gsts to 30 kts or gtr ovr hyr
mtn trrn.



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