Area Forecast Discussion
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FXUS66 KSTO 172230

Area Forecast Discussion
National Weather Service Sacramento CA
330 PM PDT Mon Sep 17 2018

Below average temperatures continue early this week, 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.


Weak upper level trough pattern continues to bring relatively
cool weather. Current temperatures are a few degrees warmer
compared to 24 hours ago and range from the upper 70s to lower 80s
in the Valley, Delta, and foothills, but still remain 5 to 10
degrees below normal.

Clear skies continue across the area except for a small patch of
stratus that briefly formed in the morning over the Woodland
area. Satellite imagery shows wildfire smoke mostly limited to
northern Shasta County, with southerly winds pushing smoke from
the Delta fire to the north.

The weak trough will give way to ridging by mid week, with
temperatures rising to near normal levels on Wednesday and
above normal on Thursday. This means Valley highs in the upper
80s to lower to mid 90s Wednesday, low to mid 90s Thursday.
Northerly winds will lower humidity levels, especially over the
northern Sacramento Valley and adjacent foothills. This with wind
gusts to around 20-25 could increase fire weather concerns. Ek


Temperatures trend down through the weekend into early next week
as a shortwave trough moves through. Any precipitation in the area should
be limited to the northern mountains, and should be light. Most of
the moisture should remain to the north. EK



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




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