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Area forecast discussion 
National Weather Service Sacramento California
227 PM PDT Monday Aug 31 2015

Synopsis...
September will start cooler than average as a weather system
moves through. No moisture with this system, just an increase to
the winds in the Delta and higher elevations across northern California.
For the Holiday weekend, dry conditions will continue with
temperatures warming back to near 90.

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Discussion...
another weather system off the Pacific northwest coast will move
inland and impact northern California for the first few days of
September. Not a lot of moisture with this system, but the cooler
temperatures will be noticeable, especially Wednesday and
Thursday. This system will also bring an increase in winds through
the Delta and over the higher terrain in the northern Sacramento
Valley.

By the end of the week, temperatures will begin to rebound with
readings back to the upper 80s on Friday.

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Extended discussion (friday through monday)

Upper trough will dominate the weather on Friday with dry, cool
weather. Temperatures expected to be 5-10 degrees below normal
that afternoon. Valley highs will be in the mid 80s up to 90 while
highs across the mountains and foothills range in the 60s to low
80s. Over the weekend, the GFS and European model (ecmwf) models paint a different
outcome for the trough. The GFS has it weakening and lifting east-northeast
over the weekend. The European model (ecmwf) shows the low's center pushing
southward into norcal on Saturday before lifting NE on Sunday
afternoon. Have trended more towards the GFS and have a gradual
warming trend over the weekend while maintaining dry weather. By
Sunday and Monday, daytime highs should be slightly above normal
with valley highs back in the 90s. Jbb



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Aviation...

VFR conditions with light onshore flow persist today into
tomorrow. Taf site winds should be around 10 kts or less. Delta
winds will range from 10-20 kts with occasional gusts up to 30
kts. Jbb



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Sto watches/warnings/advisories...
none.
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