Area Forecast Discussion
Issued by NWS Sacramento, CA

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FXUS66 KSTO 152107
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
207 PM PDT Sat Jul 15 2017

.SYNOPSIS...
Hot and dry this weekend with temperatures into the triple digits
in the Valley. A few thunderstorms possible near the Sierra crest
south of Lake Tahoe this weekend. Cooling to near seasonal
normals next week.
&&

.DISCUSSION...

Temperatures have been trending 3 to 6 degrees warmer than
yesterday. Many locations within the valley will top out around
100 degrees today with the north end of the valley near 105. A
light north wind will develop by late morning and persist through
about mid to late afternoon before the winds reverse direction
within the valley. Clouds moving up from the south will spread
over parts of the region and help to keep tonight`s lows a little
warmer...mainly over the southern half of the CWA. The clouds will
move east during Sunday morning and temperatures will warm to
between 103 and 108 for the highs.

The heat will be short lived as the high pressure shifts to the
east and a weak trough develops over the west coast. This will
cool temperatures Monday and Tuesday back to near seasonal
normals with decent flow through the Delta each day.

&&
.EXTENDED DISCUSSION (Wednesday THROUGH Saturday)

A low pressure area off the coast of British Columbia will
keep a weak trough along the California coast. This will
generate enough onshore flow through the Delta to keep extreme
heat at bay and temperatures near seasonal normals. Conditions
will be dry and monsoon moisture is expected to remain well to
the south and east of NorCal.

&&

.AVIATION...

VFR conditions next 24 hours. Winds less than 10 kts for TAF
sites.
&&

.STO WATCHES/WARNINGS/ADVISORIES...
Heat Advisory until 8 PM PDT Sunday for Carquinez Strait and
Delta-Central Sacramento Valley-Clear Lake/Southern Lake County-
Motherlode-Mountains Southwestern Shasta County to Northern Lake
County-Northeast Foothills/Sacramento Valley-Northern Sacramento
Valley-Northern San Joaquin Valley-Southern Sacramento Valley-
Western Plumas County/Lassen Park.

&&

$$



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