Area Forecast Discussion
Issued by NWS San Joaquin Valley, CA

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FXUS66 KHNX 221028
AFDHNX

Area Forecast Discussion
National Weather Service San Joaquin Valley - Hanford CA
328 AM PDT Thu Jun 22 2017

.SYNOPSIS...Above normal temperatures across the area into early
next week. Thunderstorms will be possible over the Sierra Nevada
each afternoon and evening through the weekend.

&&

.DISCUSSION...Upper level high pressure remains firmly in place
over the four corners region resulting in well above normal
temperatures. Today will be the hottest day of the forecast...with
the potential for record breaking high temperatures in Fresno and
Bakersfield. Temperatures expected to remain well above normal
through the weekend...with valley...foothill...and desert
temperatures generally in the 104 to 110 range.

The excessive heat warning was extended for the desert through
Sunday.

Take extra precautions, if you work or spend time outside.
Shelter yourself from the hot sun if possible and schedule
strenuous physical work outside to the early morning or evening
hours. Wear light colored, loose fitting clothing if possible.
Remain hydrated and drink plenty of water. Know the signs and
symptoms of heat exhaustion and heat stroke.

Young children and pets should never be left unattended in
vehicles under any circumstances. Look before you lock! The
temperature inside of a car on a hot day can climb to lethal
levels in a matter of minutes.

Subtle cooling will occur on Monday...with temperatures falling
between 2 and 4 degrees as an upper trough shifts east toward the
Pacific Northwest coastline. More significant cooling expected on
Tuesday with the first day of valley temperatures below 100
degrees...but still a few degrees above normal.

Thunderstorms will be possible over the central and southern
Sierra Nevada each afternoon and early evening through Sunday. For
today...the high resolution models are indicating the best chance
for thunderstorm development in and around Sequoia National
Park...south of where they were observed yesterday afternoon. If
you are hiking and hear thunder with no access to buildings...get
off ridges and off the water to reduce your risk of getting
struck by lightning.

One last note...with continued well above to record breaking
temperatures...significant Sierra Nevada snow melt will be
occuring. This will result in swift...cold...and very dangerous
rivers. Even through it is warm outside...do not cool off in the
river...it is not worth it. Do not become a statistic.

&&

.AVIATION...
Isolated thunderstorms are possible over the higher elevations of
the Southern Sierra Nevada this afternoon and evening. Otherwise,
VFR conditions will prevail across the central CA interior during
the next 24 hours.

&&

.AIR QUALITY ISSUES...
On Thursday June 22 2017... Unhealthy for sensitive groups in
Fresno... Kern 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 high.

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.

Excessive Heat Warning until 9 PM PDT Sunday CAZ098-099.

&&

$$

public...Riley
avn/fw...DCH
synopsis...Riley

weather.gov/hanford



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