NOAA Forecast Discussion

FXUS66 KSTO 211047

Area Forecast Discussion
National Weather Service Sacramento CA
347 AM PDT Mon Aug 21 2017

Temperatures around average thru mid-week, then warming above
average by the end of the week. Afternoon showers and
thunderstorms possible over the mountains thru Wednesday.


Some mid and high clouds possible today across interior NorCal in
the deformation area to the north of the upper low off the central
California coast, and some smoke/haze could linger due to numerous
wildfires still burning across Oregon and NW California. However,
overall conditions should be pretty good for eclipse viewing this

Upper low lingers off the central California coast through mid-
week. This will continue a chance of afternoon and evening
thunderstorms over mainly the mountains through Wednesday.
Thunderstorms may be more extensive on Tuesday as a wave lifts up
from the southeast, and a fire weather watch has been posted
across the far northern portion of the forecast area due to the
potential for abundant lightning.

Moisture and instability forecast to be scoured eastward by
Thursday as a trough in the northern stream moves through the
PacNW. Temperatures expected to be below average early this week
then warm back to above average after mid-week.


Quiet weather ahead for the long term forecast period. A stable
upper level high pressure positioned over the west will keep clear
skies and dry weather in place with above normal temperatures
across northern California.


VFR conditions expected the next 24 hours at the TAF sites. Local
HZ/FU is possible for northern Sacramento valley terminals this
afternoon. Scattered t-storms over the Sierra through 03z Monday.
Winds 5-10 knots except in the Delta where gusts to 30 knots will
be possible.


Fire Weather Watch from Tuesday afternoon through Tuesday
evening for Burney Basin and Northeast Plateau in Shasta County
Including Northwest Lassen NF north of Lassen NP-Eastern Portion
of Shasta/Trinity NF-Northern Sacramento Valley to Southern
Tehama County Line Below 1000 Ft-Northern Sierra Foothills from
1000 to 3000 Ft. Includes portions of Shasta-Trinity and Butte
Units-Northern Sierra Including Lassen NP and Plumas and Lassen
NF/S West of the Sierra Crest (West of Evans Peak-Grizzly Peak-
Beckworth Peak)-Southeast Edge Shasta-Trinity NF and Western
Portions of Tehama-Glenn Unit.



NWS STO Office Area Forecast Discussion

Information from NOAA - National Oceanic and Atmospheric Administration

spacer wunderground wow PWS SWWN Image Map