Area Forecast Discussion
Issued by NWS San Joaquin Valley, CA

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939
FXUS66 KHNX 211944
AFDHNX

Area Forecast Discussion
National Weather Service San Joaquin Valley - Hanford CA
1244 PM PDT Sun May 21 2017

.SYNOPSIS...
High pressure over central California will bring 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...
High pressure builds in the mid to upper levels over California
early this week. Models support temperatures in the upper 90s to
lower 100s across the San Joaquin Valley with mostly 70s in the
Sierra-Nevada Mountains. This will allow plenty more runoff from
melting snow in the high country. This means rivers and creeks
will remain at high levels and moving swiftly. River conditions
will have to be monitored closely through mid week.

In the short-term, it will be hot and dry with only limited
instability over the higher mountains. A trough of low pressure
moves into the Pacific Northwest by Wednesday, allowing a moist
pacific airmass to move onshore. Dynamics and precipitation with
this system will remain well north of the Forecast Area. However,
cooler temperatures will begin to infiltrate the San Joaquin
Valley. The biggest push of cool air should be Wednesday night and
Thursday. As a result, daytime highs in both the valley and
mountains will be about 15-20 degrees cooler from the highs on
Monday and Tuesday. The cooler airmass continues into Friday.

The extended forecast, into the Memorial Day Weekend, offers
little change with temperatures slightly above normal and
generally light wind across the entire Forecast Area.

&&

.AVIATION...
Although it will be hazy over the San Joaquin Valley through
Tuesday, VFR conditions will continue. A generally clear sky and
light surface wind can also be expected along all routes.

&&

.AIR QUALITY ISSUES...
On Sunday May 21 2017... Unhealthy for sensitive groups in
Fresno... Kern... Kings... Madera and Tulare Counties.
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...Lynott
avn/fw...Lynott
synopsis...Lynott

weather.gov/hanford



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