Area Forecast Discussion
Issued by NWS Sacramento, CA

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FXUS66 KSTO 251030
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
330 AM PDT Tue Apr 25 2017

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

&&

.DISCUSSION...
Break in precip across interior NorCal early this morning as
short-wave ridging from the eastern Pacific begins to build in.
However, skies remain partly to mostly cloudy across the region as
deep moisture continues to stream across the Pacific. Current
temperatures are generally in the 30s in the mountains with 40s to
lower 50s elsewhere - slightly cooler in most areas compared to 24
hours ago.

The next system will move into the PacNW today, however some
showers will make it far south as the northern mountains and
northern Coast Range. Another system will follow quickly on its
heels spreading shower chances further south later tonight and
Wednesday. Only light amounts of QPF are forecast and snow levels
will rise to above 8K feet, so expect little or no impact to
travel across the northern Sierra passes.

Stronger ridging from the eastern Pacific builds over the area
bringing a return of dry weather along with warmer temperatures as
highs are expected to return to close to average for late April.
Breezy northerly winds will also develop across the region.

$$

.EXTENDED DISCUSSION (Saturday THROUGH Tuesday)
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.

&&

.AVIATION...
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.


&&

.STO WATCHES/WARNINGS/ADVISORIES...None.

&&

$$


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