NATIONAL WEATHER SERVICE FORECAST DISCUSSION
Area Forecast Discussion
Issued by The National Weather Service
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000
FXUS66 KSTO 181045
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
345 AM PDT Tue Sep 18 2018

.SYNOPSIS...
Below average temperatures continue today, then warmer weather
returns for the second half of the week. Patchy smoke and haze
will continue, mainly locally over northern portions of Shasta
County. The weather remains dry through the weekend.

&&

.DISCUSSION...
Clear skies across the region early this morning except for a few
high clouds up by the Oregon border. Current temperatures are
similar to those of 24 hours ago and range from the 30s in the
mountain valleys to the mid 50s to lower 60s in the Central
Valley.

Weak trough today will give way to ridging the remainder of the
week with temperatures rising to above average by Thursday with
highs returning to the lower to mid 90s across the Central Valley.

Northerly winds will lower humidity levels, especially over the
northern Sacramento Valley and adjacent foothills potentially
increasing fire weather concerns.

&&

.EXTENDED DISCUSSION (Saturday THROUGH Tuesday)
Broad westerly flow aloft will bring seasonably warm temperatures
this Friday into Saturday. The pattern then begins to amplify as
an upper ridge builds over the eastern Pacific. A longwave trough
will deepen across the western US late this weekend or early next
week in response. Previous model runs hinted at a possibility of
precipitation across far northern CA over the weekend...this is
now being kept farther north. Regardless, a cooling trend is
likely through the extended period, the extent of which will
depend on how far south the trough drops. Dang

&&

.AVIATION...
VFR conditions the next 24 hours except for local MVFR/IFR due to
smoke near the Delta fire. Gusts to 20 kts through the Delta.
Otherwise, expect winds generally below 10 knots. Dang

&&

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

&&

$$
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