Area Forecast Discussion
Issued by NWS Sacramento, CA

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FXUS66 KSTO 251043
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
343 AM 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...
Thanks to a weak upper level trough over NorCal today, our region
will get a slight respite from the heat. This trough has deepened
the marine layer along the coast from 1000 ft up to 1600 ft in
the past 24 hours. In addition, the onshore gradient has allowed
the delta breeze to be enhanced overnight pushing the cooler,
marine air inland. Current temperatures in the delta and into the
Sacramento Metro region are measuring several degrees cooler than
24 hours ago. The trough will remain over NorCal today which means
today`s highs, while still very warm to hot, will be a bit cooler
than yesterday. Valley highs will range in the upper 90s to 103
with the cooler areas nearest to the delta breeze (Sacramento
region) and the hottest areas up north in the Redding vicinity.
Daytime highs in the delta and over higher terrain will range from
the upper 70s to low 90s.

The trough weakens and lifts northward by late tonight as high
pressure over the southwest strengthens into California. Residents
should be prepared for hotter temperatures Tuesday through
Friday with widespread triple digit heat across the valley. Peak
heat will be in the Redding-Red Bluff area where highs will be
around 110 degrees Wed through Fri. The Sacramento Metro region
will be near 105 during that same time-frame.

All residents should be mindful of this extended heat pattern.
Drink water throughout the entire day, avoid strenuous outdoor
activity, stay in the shade or air-conditioned places, and ensure
that kids, elderly, and pets stay cool as well! JBB

&&

.EXTENDED DISCUSSION (Friday THROUGH Monday)

Very hot weather will continue into Friday under strong high
pressure. Some monsoon moisture may make its way up from the
desert and bring a few thunderstorms to the high Sierra Friday.
Model differences arise by next weekend as the ECMWF maintains the
strong ridge across the region, whereas the GFS strengthens a
trough across the Pacific Northwest, bringing some cooling to
NorCal. Our current forecast is a blend of the two solutions.

Dang

&&

.AVIATION...

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

&&

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

$$



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