Area Forecast Discussion
Issued by NWS Sacramento, CA

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000
FXUS66 KSTO 202306
AFDSTO

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SACRAMENTO CA
406 PM PDT Wed Aug 20 2014

.Synopsis...
Near to slightly cooler than normal temperatures expected through
the weekend and into early next week. A slight chance of thunderstorms
will be possible over the Sierra Nevada to the south of Lake Tahoe
into early this evening.

&&

.Discussion...
Low clouds are slow to dissipate in the Delta today with some
clouds remaining around west of Cordelia and Benicia areas at 2
pm. Good onshore and upvalley flow and marine layer around 2700 ft this
afternoon with winds at KSUU around 25 mph and RDD-SAC surface
pressure gradient -3.2 mb. This is bringing gusty southerly winds
and marine air through the Delta and Sacramento Valley for cooler
temperatures today. Low clouds will return to the Delta tonight
but do not expect as much in the Valley tomorrow morning compared
to this morning due to marine layer more shallow, but may still
see some fragments of low clouds around Sac and east side tomorrow
morning. Some instability over the Sierra Crest for some cumulus
development south of Lake Tahoe for Isolated showers and a slight
chance of thunderstorms into early this evening.

Temperatures will warm up a little tomorrow as high pressure over
the Eastern Pacific nudges into Northern California brings weaker
onshore flow and not as deep of a marine layer. High temperatures
are expected to be in the mid 80s to mid 90s in the Valley and
low 60s to low 80s in the mountains. A trough drops down into the
Pacific Northwest and into Northern California on Friday and
shifts to the east over the weekend leaving Northern California
generally in Northwesterly flow aloft between the ridge over the
Eastern Pacific and trough over the Western U.S. Temperatures will
be a little cooler on Friday with highs in the low 80s to low 90s
in the Valley and 60s and 70s in the mountains. Temperatures may
be similar to a few degrees warmer on Saturday. No precipitation
is expected Friday into the weekend.

&&

.Extended Discussion (Sunday through Wednesday)

Dry northwesterly flow will remain over the area through the
extended period as high pressure remains off the coast. Expect
benign weather and near normal temperatures to continue through
the early portions of next week.

Dang


&&

.Aviation...

Mainly VFR conditions the next 24 hours across interior Northern
California. MVFR/IFR ceilings will continue along the western
Delta through Thursday morning, with a slight chance of stratus
moving toward Sacramento TAF sites Thu morning. Isolated
Thunderstorms possible Sierra crest south of Tahoe this afternoon
and evening. South to west winds 10-15 kt except near the delta
southwest winds 15-25 knots. Winds will be diminishing this
evening and tonight.

Dang


&&

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

$$






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