Area Forecast Discussion
Issued by NWS San Joaquin Valley, CA
FXUS66 KHNX 232259
Area Forecast Discussion
National Weather Service San Joaquin Valley - Hanford CA
359 PM PDT Thu Mar 23 2017
An active pattern is expected for the next several days with
periods of wet weather and breezy to gusty winds. Temperatures
will fluctuate a little but generally within a few degrees above
or below normal for this time of year.
Brisk northwesterly flow continues across central California this
afternoon in the wake of the recently passed frontal system. This
is holding temperatures several degrees below climo with just some
scattered flat cu across the SJ Valley and upslope cloudiness
piled along the foothills and lower mountain elevations.
Brief shortwave ridging behind the system will last only through
early Friday when the next shortwave trough moves onto the west
coast. Precip with this system is progged to begin impacting the
Yosemite vicinity early Friday morning. Short range high res
models then spread precip southward across our area through the
afternoon ahead of the approaching frontal trough. Snow levels
will be 8000 feet and higher during this period, then lower to 5
to 6 thousand feet into the evening and overnight as the boundary
passes. QPF amounts with the system range from around 1/3 of an
inch in the SJ Valley north of Fresno County, tapering to just a
few hundredths in Kern County. Foothills range from around 1/4 to
3/4 of an inch with 1/2 inch to an inch and locally up to 1.5
inches in the Sierra. With the initial high snow levels, the bulk
of the snow accumulations will be above 8000 ft, where as much as
6-12 inches could fall. Around 4-8 inches is expected down to
around 6-7 thousand ft.
Some scattered showers can be expected to continue across the
area through Saturday, with upslope showers lingering into the
evening over the favorable terrain. Models agree on shortwave
ridging Sunday behind the departing trough with another trough
approaching from from the Northeast Pacific. Models begin to
diverge in timing and evolution of this system but generally this
will bring precip chances to our area Later Sunday into Monday
night. Increasing onshore surface pressure gradients with upper
level jet support will create some significant gusty winds across
the area Monday as the system moves through.
Dry conditions will then be in store through the middle of next
week when another trough is progged to move into the region.
Temperatures through the period will hover near climo in the
VFR conditions can be expected across the central California
interior for the next 24 hrs.
.AIR QUALITY ISSUES...
The level of certainty for days 1 and 2 is medium.
The level of certainty for days 3 through 7 is medium.
Certainty levels include low...medium...and high. Please visit
www.weather.gov/hnx/certainty.php for additional information
an/or to provide feedback.