Area Forecast Discussion
Issued by NWS San Joaquin Valley, CA

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FXUS66 KHNX 221109

Area Forecast Discussion
National Weather Service San Joaquin Valley - Hanford CA
409 AM PDT Fri Mar 22 2019

High pressure will provide a dry day before another weather
disturbance moves across Northern California on Saturday bringing
another threat of precipitation. High pressure with dry weather
rebuilds for the late weekend through Monday.


Some upslope clouds banking along the sierra foothills and
Tehachapi Mountains due to a NW wind flow. Otherwise clear skies
across central CA. Some patchy fog may develop towards sunrise
with dew points in the low 40s indicating plenty of low level
moisture. Expect mainly shallow patchy fog a couple of hours only
in the favored low spots of the San Joaquin Valley. Some high
clouds starting to reach the coastal area from an upstream weather
system. Precipitation threat should hold off until the evening
but look for increasing high clouds today. Models show the best
dynamics with the trough will push through N CA tonight. Although
the front will move into central CA saturday and weaken over the
area by Saturday evening. Thus expect the heavier precipitation
towards the North central Valley and Yosemite area. A quarter
inch of rain is forecasted near Merced and near three quarters in
the high country of Yosemite. Mainly light amounts across the
South SJ and Tehachapi mountains. The higher snow accumulations
expected 4-6 inches over the Yosemite high country above 6kft.
Behind the trough gusty winds will be possible through and below
the mountain passes of the Kern County Mountains and desert
Saturday afternoon and evening. Higher resolutions models show
some lower level clouds upsloping over the north facing slopes of
the tehachapi mountains into Sunday morning.

A trough will set up off the Pacific NW coast next week. Several
short wave disturbances will move through the weather system
during mid week. Models timing with the individual waves remain
poor. But there is consensus on tropical moisture being picked up
into the weather system and increasing the potential for heavier
and more widespread precipitation across the central CA interior
during mid week.


Areas of mountain obscuring IFR will continue across the Southern
Sierra Nevada and Tehachapi Mountains until 18Z Fri. Local MVFR
conditions in low clouds in the San Joaquin Valley and southern
Sierra foothills through 00z Sat. Otherwise VFR conditions will
prevail across the Central CA Interior for the next 24 hours.





The level of certainty for days 1 and 2 is high.
The level of certainty for days 3 through 7 is medium.

Certainty levels include low...medium...and high. Please visit for additional information
an/or to provide feedback.


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