FXUS66 KSTO 242226
Area Forecast Discussion
National Weather Service Sacramento CA
226 PM PST Fri Feb 24 2017
Flooding concerns continue as runoff from the recent rain
continues to work its way downstream adding stress to waterways. A
couple of weak but cold storms move through around Saturday and Monday.
An extended period of dry weather starts the middle of next week.
.Discussion (Today through Monday)...
Satellite and Radar imagery showed some development of cumulus
over the Sierra, but otherwise conditions were fair across
northern California during the early afternoon hours. Latest short
term models show showers developing and spreading over the
forecast area this evening as an upper level shortwave trough
slides over the area. Models are trending with the upper level
shortwave trough staying off the coast and not influencing
northern California too much. As a result, some light precip can
be expected for the valley with light snow through Saturday
morning for foothill and Sierra locations. Some snow could even
fall as low as between 1500 and 2500 feet with this colder system.
Another shortwave trough will clip northern California Sunday,
which will bring another round of rain and snow chances. Between
4 and 6 inches can be expected for the mountain passes Sunday
through Sunday night. A ridge will begin to build into the region
on Monday once the shortwave trough passes, although a few
lingering showers will still be present for the Sierra.
Temperatures through the period will remain between 5 and 10
degrees below normal.
.EXTENDED DISCUSSION (Tuesday THROUGH Friday)
A few showers may linger over far northern Sierra Tuesday but
won`t amount to much additional accumulation. Otherwise, dry
weather returns through at least the end of the week, as ridging
builds in. This will lead to a warming trend in temperatures and
mostly clear skies. A few flooding issues may linger as reservoir
releases continue. CEO
VFR conditions expected through the next 24 hours. Light rain for
the Valley and snow for the Sierra possible beginning this evening
with mainly variable winds below 10 kts. Clouds becoming
broken/overcast through the end of the forecast period.
Winter Weather Advisory from 10 AM to 10 PM PST Sunday for
Shasta Lake Area / Northern Shasta County-West Slope Northern
Sierra Nevada-Western Plumas County/Lassen Park.
Flash Flood Watch through late Thursday night for Carquinez
Strait and Delta.