Area Forecast Discussion
Issued by NWS Sacramento, CA

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000
FXUS66 KSTO 211629
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
929 AM PDT WED SEP 21 2016


.SYNOPSIS...
A few light showers from Sacramento southward this morning. A
slight chance of showers or thunderstorms across the far northern
mountains and Sierra today and Thursday. Breezy winds over the
southern Cascades today with a Red Flag warning there today for
winds and low RH. Cooler than normal temperatures through Friday
then warmer than normal over the weekend and into next week.

&&

.Discussion...
A cool upper level trough is approaching from the Pacific
Northwest and will move inland later today and tonight. This will
bring cooler temperatures and the potential for some showers and
maybe even some thunderstorms over the northern mountains this
evening and overnight.

A few light showers and sprinkles are falling this morning from
around I80 southward. This is due to subtropical moisture coming
up from the south and a very weak disturbance ahead of the trough.
This is the first rain seen in the Sacramento metro area since May
20th, though it has just been a trace. The only measurable amounts
have fallen in the Motherlode and the Sierra. Along the Highway 50
corridor, a weather spotter reported 0.03" in Kyburz, and sensors
show a few spots with around 0.05". Owens Camp just to the south
has reported the most, at 0.11". For much of the area the
precipitation is virga, evaporating before it reaches the surface
due to low level dry air.

Temperatures are noticeably cooler, at 9 am generally 3 to 9
degrees lower than yesterday. There is a cooler airmass and more
cloud cover, though much of the cloud cover will shift eastward,
with more sun later this morning and into the afternoon. The
exception is over the Sierra south of Highway 50 and portions of
the Motherlode, where clouds and some light rain showers could
linger through the day. EK

.EXTENDED DISCUSSION (Sunday THROUGH Wednesday)

Warm and dry conditions will dominate NorCal Sunday into midweek
as high pressure strengthens over the eastern Pacific Ocean and
builds into the West Coast. High temperatures will range about 5
to 10 degrees above normal this weekend into next week. JBB


&&

.AVIATION...

VFR conditions continue the next 24 hours with winds at TAF sites
generally between 5-15 kts with local gusts up to 25 kts this
afternoon into evening.


&&

.STO Watches/Warnings/Advisories...
Red Flag Warning until 8 PM PDT this evening for Northern Sierra
Including Lassen NP and Plumas and Lassen NF/S West of the
Sierra Crest (West of Evans Peak-Grizzly Peak-Beckworth Peak).

&&

$$



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