Area Forecast Discussion
Issued by NWS Sacramento, CA

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000
FXUS66 KSTO 261008
AFDSTO

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SACRAMENTO CA
308 AM PDT WED AUG 26 2015

.SYNOPSIS...
Dry weather with daytime temperatures a little above normal
through the end of the week. Cooler temperatures beginning over
the weekend with a chance of showers over the northern portion of
the state. A little below normal daytime highs continuing through
most of next week.

&&

.DISCUSSION...
Fair skies over the CWA this morning under stable southwest flow.
Delta breeze similar to 24 hours ago with similar marine layer.
Just a slight airmass cooling will bring a minor drop in daytime
highs today. Not much change in store for Thursday under continued
southwest flow aloft as northern California remains between high
pressure over the southwest U.S and a low pressure system off the
Pacific Northwest coast. Some models hinting at a shortwave
rippling through the central Sierra Thursday afternoon and
evening. GFS and NAM showing some mid to upper level MU cape from
about Alpine county southward so kept a slight threat of afternoon
showers there into the evening hours. Some minor changes are
expected to occur on Friday as the low pressure system off the
Pacific Northwest coast begins to shift inland. Except for valley
areas south of about Stockton...most areas will see increasing
clouds on Friday as well as a slight drop in daytime highs
although most areas will remain a little above normal. A cold
frontal band is forecast to shift onto the northern California
coast line Friday evening and night bringing a chance of rainfall
north of a line from about Chester to Lake county. Conditions do
not look particularly unstable in this area so mainly expecting
light synoptic precipitation. Subsequent shortwaves will bring a
threat of light rain to the northern areas on Saturday as
well...possibly a little farther south than Friday evening. For
the rest of the forecast area...the main change going into the
weekend will be a significant cool down with daytime highs on
Saturday expected to drop to as much as 10 degrees below season
normals.

.EXTENDED DISCUSSION (Sunday THROUGH Wednesday)

Weaker upper trough lingers over the region early next week with
dry weather and temperatures around average for late-August/early-
September.
&&

.AVIATION...

Swly flow alf with upr high ovr four corners region and upr trof
offshr PacNW. VFR conds ovr int NorCal nxt 24 hrs exc lcl IFR
cigs MVFR vsbys Carquinez Strait until 17Z. Lcl swly sfc wnd gsts
20-30 kts contg w Delta, strongest aft 06Z Thu.
&&

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

$$


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