Area Forecast Discussion
Issued by NWS Sacramento, CA

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FXUS66 KSTO 151045
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
345 AM PDT Fri Sep 15 2017

.SYNOPSIS...
Dry with seasonal temperatures through the weekend. Cooler weather
with a chance of showers next week.

&&

.DISCUSSION...
Upper trough is shifting east with only some lingering clouds left
in its wake across portions of the Sacramento Valley and along the
west slopes of the northern Sierra Nevada. Current temperatures
are cooler compared to 24 hours ago and generally range from the
mid 30s to mid 40s in the mountain valleys to the mid 50s to lower
60s in the Central Valley.

Warmer temperatures return to the region today with less
cloudiness, synoptic warming and northerly flow. Dry weather with
seasonably mild temperatures will continue through the weekend.

Trough forecast to deepen again along the West Coast early next
week bringing a return of cooler weather and breezier conditions.
Precipitation chances will initially be limited to far northern
California.

&&

.EXTENDED DISCUSSION (Tuesday THROUGH Friday)
The extended forecast begins next Tuesday which should be the
coolest day with valley highs in the mid 70s and highs over the
mountains and foothills ranging 50s to low 70s (40s near the
Sierra Crest). This much cooler pattern is thanks to a trough
swinging through the Pacific Northwest and extending southward
into CA next week. Latest GFS and ECMWF models indicate that the
bulk of precipitation will stay north of us, but we could still
see a chance of showers through the end of the week. Showers will
likely be over higher terrain, but there`s a slight chance that
some shower activity could occur in the northern Sacramento
valley. As stated in the previous extended discussion...these
cooler temperatures are likely to catch travelers and outdoor
recreationalists off guard! This will also serve to lower snow
levels, perhaps significantly enough to cause a dusting of snow
across the highest crests. Something to prepare for if you plan to
be in higher terrain during the first half of next week. The
trough will gradually track eastward which will cause a warming
trend after Tuesday. JBB/CEO

&&

.AVIATION...
VFR conditions next 24 hours. Breezy north winds developing
today, with gusts to 18 kts across northern Sacramento Valley
after 18z impacting the KRDD and KRBL TAF sites. Winds lighten by
00z Saturday except for the delta region where wind gusts could be
up to 20 kts overnight. JBB

&&

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

&&

$$



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