...SHOWERS OVER SRN OR AND NRN AND CENTRAL CA AND NV FRIDAY THEN
OVER MOST OF THE REGION ON SATURDAY AND MAINLY OVER AREAS OF CENTRAL
AND SRN CA AND DOWN ALONG THE SIERRA AND EAST OVER NEVADA SUNDAY
THEN MAINLY CENTRAL AND ERN NV MONDAY AS A LOW/TROUGH AFFECTS THE
REGION...

...COOLER OVER THE WEEKEND WITH MAX TEMPS DROPPING BELOW NORMAL BY
10-20 DEG F OVER MOST OF THE REGION AND OVER NEVADA ON MONDAY...

.METEOROLOGICAL CONDITIONS (THU AM - WED AM)...

Trough over the Western U.S. with dry conditions over the region
today. A disturbance approaches the ORCA border tonight and deepens
the trough over the region on Friday into Saturday with a closed low
forming Saturday night into Sunday shifting to the east on Monday
as high pressure builds into the region from the Eastern Pacific.
Precipitation may start as early as Thursday night over NW CA coast
(around Cape Mendocino north) and along the Srn Or Cascades. Showers
spread south and east over Srn Or, Nrn CA and NV Friday afternoon
into night and spreading south and east into Central CA and along
Srn CA coast and mountains and over NV on Saturday. Isolated
thunderstorms are also possible. Showers mainly along the Sierra and
east over Nevada with few showers possible over Central CA and along
the SRN CA coast and mtns on Sunday and decreasing and mainly over
Central and Eastern NV on Monday. Freezing levels dropping to around
7000 ft near the ORCA border and around 8000-9000 ft for the Sierra
Saturday and around 7000-8000 ft for the NE Plateau and Nrn Sierra
and into Wrn NV Sunday. Highest precipitation amounts generally
expected along NW CA coast and Shasta Basin and along the Sierra
and over higher terrain of NV with 0.5-1.5 inches. The trough will
also bring cooler temperatures with max temperatures generally
dropping to 10 to 25 degrees below normal and min temps near normal
to 10 degrees below normal over the weekend. Nevada and Srn CA will
still be around 10 to 20 degrees below normal on Monday but Nrn and
Central CA will warm up to near normal to 10 degrees below normal as
high pressure builds in. Dry and warmer conditions are expected on
Tuesday with ridge of high pressure over the west coast.

Please Note: This product may NOT be routinely updated Friday
through Sunday between Jun 1 and Oct 1. Please refer to
www.cnrfc.noaa.gov/dailyBriefing.php for a graphical summary of
weather and hydrologic conditions.