Area Forecast Discussion
Issued by NWS San Joaquin Valley, CA

Current Version | Previous Version | Graphics & Text | Print | Product List | Glossary Off
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

000
FXUS66 KHNX 142321
AFDHNX

Area Forecast Discussion
National Weather Service San Joaquin Valley - Hanford CA
421 PM PDT Sat Apr 14 2018

.SYNOPSIS...Dry weather and seasonably mild conditions will
continue into Sunday. Another storm system is expected to move in
Sunday night through Monday, bringing rain and snow along with
gusty winds and much cooler temperatures. Dry and mild again
Tuesday and Wednesday, then more wet weather is possible by
Thursday.

&&

.DISCUSSION...

With sunny skies prevailing across central CA today, temperatures
have climbed to around seasonal normals under a ridge of high
pressure overhead, and should add a few more degrees for
afternoon highs. THe ridge will edge eastward ahead of another
approaching low pressure system from the northeast Pacific Ocean.
This will mean another seasonably mild day Sunday across most of
the district, with just a couple of degrees of cooling over
northern portions of our area as the trough nears and onshore
flow increases.

Models remain similar with the evolution of the approaching storm
system, bringing chances of precipitation to the Sierra near
Yosemite by Sunday evening as the weak frontal trough moves into
the region. The storm system will swing inland Monday and through
the Great Basin area by Tuesday. This will spread precipitation
across the area overnight and into Monday, then tapering off
through Monday night. Moderate moisture accompanying this system
will bring around 1/2 to 1 inch of precip over the Sierra,
tapering down to around 1/10 or less in the Kern County mountains.
SJ Valley locations will receive around 1/4 inch in northern
portions to 1/10 or less in Kern County. Desert areas can expect
no more than a couple of hundredths. Snow levels with this
relatively cold system will start out around 7000 ft, lowering
below 4000 ft with the arrival of the colder air later Monday. By
Monday night into Tuesday morning, with snow levels below 4000 ft
in the Kern County mountains, and some lingering upslope showers,
there could be a dusting of snow affecting the roads there. Snow
amounts over the Sierra will reach as high as 5-10 inches at the
highest elevations. Cold air aloft with the incoming system will
create enough instability for a slight chance of Valley and
foothill thunderstorms Monday afternoon into the early evening.

Gusty winds will also accompany the system and much cooler
temperatures will be in store by Monday, with highs dropping to as
much as 9-18 degrees below climo. Model agreement continues into
Tuesday and Wednesday, with dry and warming conditions under
shortwave ridging in advance of another approaching storm system.
By Wednesday, highs recover to near climo, then cooling with
precipitation chances spreading over the district through Thursday
into Friday. Model diverge on details with this system, but show
another mild weekend in store behind it.


&&

.AVIATION...
VFR conditions will prevail across the Central CA Interior during
the next 24 hours.

&&

.AIR QUALITY ISSUES...
None.

&&

.CERTAINTY...

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
www.weather.gov/hnx/certainty.php for additional information
an/or to provide feedback.

&&

.HNX Watches/Warnings/Advisories...
NONE.
&&

$$

public...JEB
avn/fw...DCH
synopsis...JEB

weather.gov/hanford



USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.