Area Forecast Discussion
Issued by NWS San Joaquin Valley, CA

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FXUS66 KHNX 221143
AFDHNX

Area Forecast Discussion
National Weather Service San Joaquin Valley - Hanford CA
443 AM PDT Mon May 22 2017

.SYNOPSIS...
High pressure over the region will maintain dry and hot
conditions through Wednesday. Temperatures in the San Joaquin
Valley will hit or slightly exceed triple digits, especially on
Monday and Tuesday. Temperatures then begin to cool Wednesday
night and Thursday. Only isolated showers or Thunderstorms are
possible over the Sierra Crest through mid week.

&&

.DISCUSSION...
A shortwave trough which brushed our area is moving away to the
east and the mid/upper level ridge of high pressure behind it is
strengthening over California. This passing trough helped trigger
a couple of thunderstorms over the Sierra crest Sunday afternoon.
As the ridge strengthens overhead during the next couple of days,
temperatures will continue to warm across central California and
triple digit highs will be recorded over much of the San Joaquin
Valley and the Kern County desert areas. Can`t rule out another
high Sierra shower or thunderstorm or two but conditions
otherwise remain dry under the ridge.

Another low pressure trough is progged to slide from the Pac
Northwest Wednesday and temporarily flatten the ridge through
Friday. This will bring gusty winds to the Kern County mountains
and desert areas as well as along the west side of the SJ Valley
Wednesday and Thursday. Temperatures will trend downward starting
Wednesday and by Friday, afternoon highs will be a few degrees
below climo for late May- around 20 degrees lower than Tuesday`s
highs. A few more thunderstorms will be possible over the Sierra
with the incoming trough Wednesday. During this period of very
warm weather, excessive snow melt is expected to push the Merced
River above flood stage by early Tuesday morning. The river is
forecast to crest above flood stage Wednesday and Thursday as
well, before the lower temperatures decrease the rate of melting
snow.

The remainder of the Memorial Day holiday weekend will remain dry
with temperatures trending back upward, as the high pressure
ridge rebounds over the west coast. By Monday, highs are expected
to top out around ten degrees above seasonal averages but not
back to triple digits yet.

 &&

.AVIATION...
Local IFR possible over the Sierra Nevada crest due to mountain
obscurations from isolated thunderstorms during this afternoon and
into early this evening. VFR conditions are otherwise expected
across the central CA interior during the next 24 hours.

&&

.AIR QUALITY ISSUES...
On Monday May 22 2017... Unhealthy for sensitive groups in
Fresno... Kern... Kings... Madera and Tulare Counties and Sequoia
National Park and Forest.
Further information is available at Valleyair.org

&&

.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...BSO
synopsis...JEB

weather.gov/hanford



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