Area Forecast Discussion
Issued by NWS San Joaquin Valley, CA
FXUS66 KHNX 220359 AAA
Area Forecast Discussion...UPDATED
National Weather Service San Joaquin Valley - Hanford CA
859 PM PDT Tue Mar 21 2017
Cooler than normal temperatures and unsettled conditions will
prevail through Wednesday. Another storm will move through the
area on Friday and Saturday bringing additional precipitation.
.UPDATED DISCUSSION... Updated forecast to remove thunderstorms
overnight as convection winds down. Slight adjustments to
overnight temps based on current trends.
.PREV DISCUSSION... /issued 330 PM PDT Tue Mar 21 2017/
Frontal system moving onto the west coast is pushing a cold front
into central California. Showers ahead of this feature are now
mostly confined to the mountains with a few light showers
affecting the desert areas in Kern County. Right along the frontal
zone, currently moving southeast toward northern Fresno and Madera
counties, we are getting some strong thunderstorms which have
shown some rotation along with some hail and very heavy rain.
Additional energy dropping through the approaching low will keep
unsettled conditions in place over central California through
Wednesday when another trough pushes inland. Thunderstorms will
continue into the evening then a chance for showers through the
night in the slightly less unstable airmass. By Wednesday as the
cold pool aloft moves overhead we should see more scattered
thunderstorms across our area, with very heavy rain, hail and
Thursday brings a brief break from the precipitation under high
pressure ridging ahead of the next approaching trough. Models
remain in good agreement, moving this next system inland across
our area late Friday into Saturday. This will bring additional
rain chances with somewhat lower snow levels for our area.
Models diverge a bit for early next week but generally point to
the weekend remaining unsettled into early Monday. Temperatures
will hover closer to climo through the period as the storm systems
continue to track through the area.
Isolated showers and thunderstorms thru 03Z Wed and again after 19Z
Wed. In the San Joaquin Valley and Kern County Deserts, local MVFR
conditions in showers. In the Southern Sierra Nevada and adjacent
foothills...widespread mountain obscuring IFR in showers. In the
Tehachapi Mountains, areas of MVFR conditions with local IFR in low
clouds and showers. Otherwise, VFR conditions can be expected across
the Central CA Interior during the next 24 hours.
.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.