Area Forecast Discussion
Issued by NWS Sacramento, CA

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000
FXUS66 KSTO 252250
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
350 PM PDT MON JUL 25 2016

.SYNOPSIS...
Cooling today will be brief as widespread triple digit heat
returns to the Central Valley on Tuesday. Daytime highs will
be well above normal through Friday. Cooler next weekend.

&&

.DISCUSSION...
Temperatures today generally haven`t been quite as hot as a weak
upper level trough brought cooler onshore flow. The Delta breeze
influenced areas saw the biggest change, but most of the effects
were earlier in the day. Locations further north saw little
change, with the northern Sacramento Valley actually a degree or
two warmer. There should be a slightly weaker Delta breeze
tonight before the trough begins to shift eastward, and this will
bring some cooling to the Delta, southern Sacramento and northern
San Joaquin Valleys.

Ridging rebuilds Tuesday and widespread triple digits return
across the Valley and foothills Tuesday afternoon and continues
through the week. The highest temperatures are expected Wednesday
and Thursday. Forecast highs approach record levels over the
northern Sacramento Valley, reaching as high as 111 for Redding.
Anyone sensitive to heat should take precautions when involved in
outdoor activities.

Smoke from the Soberanes Fire in Monterey County is spreading
across the northern San Joaquin and southern Sacramento Valleys
and into the foothills and northern Sierra. This is bringing some
hazy skies to those areas. AirNow forecasted this could also
bring air quality levels that will be locally Unhealthy for
Sensitive Groups (USG) today.  EK

&&

.EXTENDED DISCUSSION (Friday THROUGH Monday)

One last very hot day expected Friday as strong high pressure rules.
Model differences remain for the weekend but ECMWF has started to
shift toward GFS and GEM solutions with troughing developing, just
toward the end of the weekend instead of by Saturday. Weakening
ridge may serve to draw monsoon moisture northward from the
desert with a few thunderstorms possible across the high Sierra on
Friday and Saturday afternoon. Regardless of timing or strength of
troughing, some cooling is expected across the region and
temperatures may fall back down toward normal levels by Sunday.

CEO

&&

.AVIATION...

VFR conditions next 24 hours. Winds generally below 10 knots
except gusts to 20-25 knots in the delta.

&&

.STO Watches/Warnings/Advisories...
None.
&&

$$



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