Area Forecast Discussion
Issued by NWS Sacramento, CA

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000
FXUS66 KSTO 272237
AFDSTO

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SACRAMENTO CA
337 PM PDT Wed May 27 2015

.Synopsis...
Gradually warmer temperatures through the end of the week. Daytime
highs 10 to 15 degrees above normal by Friday. Cooler early next
week with a slight chance of showers over the northern portion of
the forecast area as the tail end of a Pacific system brushes
through.

&&

.Discussion...
High pressure ridging over the eastern Pacific is bringing some
warmer temperatures this afternoon as it begins to build inland.
Temperatures are highest over the northern Sacramento Valley,
where at 3 pm it was 89 at Redding, 85 at Red Bluff. A Delta
breeze is keeping things cooler for the Delta, southern
Sacramento and northern San Joaquin valleys, though even those
spots have warmed some compared to yesterday. The northern and
central Sacramento Valley and adjacent foothills should also see a
noticeable increase in overnight temperatures, overnight tonight
and especially Friday night/Saturday morning.
Afternoon convection in the mountains has been much less than in
recent days, as expected. Some lingering moisture and instability
is generating cumulus clouds, but shower activity so far has been
near or east of the California-Nevada border. There is still a
small possibility of a few isolated showers along the crest by
sunset.
The Delta breeze will strengthen again overnight. The upper level
ridge is beginning to compress the marine layer some, but it may
be thick enough to spread through the Delta and reach the
Sacramento area. The morning cloud cover is not expected to be as
thick or extensive, though, and may be just some scattered clouds.
Thursday will be dry and warm, with high temperatures rising 3-5
degrees over what we are seeing today. Friday should be another
2-3 degrees warmer, with widespread 90s in the Valley. Dry weather
is expected, even in the mountains. EK

Afternoon high
temperatures peak on Friday, with little change on Saturday.
Widespread highs in the 90s expected in the Valley, mid to upper
80s in the foothills. EK
&&

.Extended Discussion (Sunday through Wednesday)

A decent waves moves across Interior NorCal late Sunday into
Tuesday. Dynamics and moisture look limited with the main impact
appearing to be synoptic cooling with increased onshore flow.
Locally gusty southwest winds expected through the Delta and over
higher mountain terrain Sunday and Monday before shifting more
west-northwesterly Tuesday. Potential showers and thunderstorms
mainly over the mountains north of I-80 through this period. High
temperatures begin to warm midweek as upper troughing shifts east
and EPAC ridging builds inland.    JClapp

&&

.Aviation...

Mainly VFR conditions over the area tonight. Local MVFR in the
Delta and Sacramento metro area from marine stratus may return
again late tonight, 09z-17z Thursday, but should be less extensive
and clouds may be more scattered. Local gusts to 30 kt possible in
the Delta area overnight through Thursday morning. A few
afternoon/early evening isolated showers possible over Lassen Park
and along the Sierra crest south of KTVL today. EK


&&

.STO Watches/Warnings/Advisories...
None.
&&

$$







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