Area Forecast Discussion
Issued by NWS San Joaquin Valley, CA

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000
FXUS66 KHNX 201947
AFDHNX

Area Forecast Discussion
National Weather Service San Joaquin Valley - Hanford CA
1247 PM PDT Tue Jun 20 2017

.SYNOPSIS...
Much above normal temperatures and dry conditions will continue
across the area into the weekend. Dangerous heat conditions will
also continue for the San Joaquin Valley and the Kern County
Desert through at least Friday.

&&

.DISCUSSION...
The dominant high pressure over the southwest will continue to
retrograde and reside over the region into the weekend.
The low temperatures across the San Joaquin Valley and Kern County
desert only cooled, and I am using the term cooled very loosely,
to the upper 70s, a few locations did not even see temperatures
below 80. Here at HNX we recorded a low of 77 degrees, as of noon
we were already at 99 degrees. We have a legitimate shot of
breaking or at least tying Fresno high temperature record for
this date which is 110 set back in 1920.

A serious concern for peoples well being in this heat exists,
with these aforementioned high-minimum temperatures coupled with
the hot maximum temperatures and high dew points, near 70 degrees
in many areas. This really puts a strain on peoples systems, not
only their bodies cooling system but their air conditioning and
electrical systems. The duration of this excessive heat will also
contribute to the strain. If you are working outside, please take
many breaks and drink plenty of water. People are also urged to
use community cooling shelters during the heat of the day to get
some relief from the dangerous heat. These conditions are expected
to continue through the end of the week. The heat will continue,
albeit slightly cooler, and again I am using that term very
loosely, through the weekend. A trough moving into the area by the
beginning of next week should allow high temperatures in the San
Joaquin Valley to dip below the century mark for the first time in
a little over a week on Tuesday.

&&

.AVIATION...
Isolated thunderstorms are possible over the higher elevations of
the Southern Sierra Nevada thru 04Z Wed and again after 21Z Wed.
Otherwise, VFR conditions will prevail across the central CA
interior during the next 24 hours.

&&

.AIR QUALITY ISSUES...
On Tuesday June 20 2017... Unhealthy for sensitive groups in
Fresno... Kern... Kings 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...
Excessive Heat Warning until 11 PM PDT Friday CAZ089>095-098-099.

&&

$$

public...Andersen
avn/fw...DS
synopsis...Andersen

weather.gov/hanford


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