...GRADUAL COOLING FROM W TO E INTO NEXT WEEK...
...ISOLATED SHOWERS/T-STORMS OVER THE SRN SIERRA INTO NV SAT,
OTHERWISE NO ORGANIZED THREAT OF PRECIP FOR THE REGION...

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

An upper low to the southwest of CA along with a trough passing
through the PacNW has pushed the offshore upper ridge further out to
sea. This will allow for some gradual cooling to kick off today as
the retrograding ridge makes way for disturbances to move across the
region. Models show a deepening trough into the PacNW over the
weekend eventually expanding to cover most of CA/NV with the upper
low just to its southwest. There is still no threat of organized
widespread precip with this troughing, but some afternoon/evening
showers/thunderstorms will be possible over the southern Sierra and
into NV on Saturday. This pattern shift will also gradually cool
temperatures from west to east starting today with coastal areas
below normal while interior CA and NV remain 5-10 deg F above normal
today and tomorrow. Most areas are expected to see temps drop down
to 5-10 deg F below normal by Monday as the trough takes over and
then swings eastward through CA/NV. This may result in some
additional showers over the southern Sierra and into NV along with
isolated thunderstorms.

On Tuesday, another low will travel through BC bringing troughing
back into the PacNW as high pressure attempts to shift closer to the
coast. The approaching low will block the ridge from moving back in
keeping temperatures near to below normal the rest of the forecast
period. As the low digs into the PacNW mid-week the system may
produce a few light showers along the northern CA/NV borders, but
nothing significant. Higher freezing levels 10-13 kft for most of
the region through the period with occasional lowering over far nrn
CA/NV down to 7-9 kft.