...SCATTERED SHOWERS CENTRAL/SOUTHERN SIERRA INTO NV WED-FRI...
...COOL LOW PRESSURE SYSTEM IMPACTS THE REGION SAT-TUE...

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

The s/wv trof that moved down the northern CA coast before swinging
inland across central CA on its way toward southern NV yesterday has
exited the region and is currently approaching the 4-Corners region.
Scattered showers and thunderstorms associated with this feature
developed over portions of the Sierra during the afternoon hours
before dissipating around sunset.

Cyclonic flow aloft continues over the interior with a secondary
disturbance dropping southward from the Pacific Northwest toward the
Great Basin. This is expected to generate another round of scattered
showers and possibly a thunderstorms today mainly over the
central/southern Sierra and portions of eastern NV.
However...coverage is looking to be less than what occurred on
Tuesday. This overall setup continues into Thursday...while an
offshore narrow wavelength upr ridge nudges its way toward the west
coast. With the cyclonic flow over the interior...and another
disturbance making its way across the Great Basin...look for more
afternoon and early evening showers and possibly a thunderstorm for
similar areas to Day 2 over the southern Sierra and eastern NV.

For the Friday into the weekend...a s/wv trof moving across the
northeast Pacific will reach close to Vancouver Island before
changing directions and diving southward generally along or just
inside of 130W. This will help to shove the cyclonic flow and narrow
wavelength upr ridge downstream of the area. Once the upr low
reaches the latitude of northern CA the look for increasing
unsettled conditions to spread across the region...especially in the
diffluent flow of the northeast quadrant of the circulation. This
will bring the best precip over areas near the CA/OR border and down
the northern/central Sierra. Into early next week...the upr low will
slowly drift to off the central CA coast before finally shifting
eastward and inland...which will continue the unsettled conditions
through Tuesday. Overall amounts currently show 0.25- to 0.50-inch
at the wettest locations near the CA/OR border and northern/central
Sierra. However...if convective precip does develop with this
feature...which is a possibility...localized heavier amounts would
occur.

Freezing levels this morning are lowest over the upper Klamath River
basin over toward the Great Basin with 7500- to 8500-feet. These
increase up to about 10000- to 12500-feet along coastal locations.
As the narrow wavelength upr ridge approaches the coast...these will
bump up and peak on Friday into early Saturday as the high pressure
slides overhead from 11000- to 13000-feet. Then with the upr low
moving toward the region into early next week...freezing levels will
slowly drop with the core of the system bringing them down to 6000-
to 7000-feet on Monday into Tuesday.

Please Note: This product may NOT be routinely updated.
Please refer to the following product issued by the CNRFC
www.cnrfc.noaa.gov/Daily-Briefing for a graphical summary of
weather and hydrologic conditions.