Scientific Forecaster Discussion
fxus66 khnx 231157
Area forecast discussion
National Weather Service San Joaquin Valley - Hanford California
457 am PDT Fri Jun 23 2017
Synopsis...well above normal temperatures again today then
slight cooling this weekend. Thunderstorms will be possible over
the Sierra Nevada each afternoon and evening through the weekend.
Dry conditions and further cooling early next week.
Discussion...more record breaking high temperatures occurred on
Thursday as strong high pressure aloft remains in control. Though
some areas may be a couple of degrees lower today, temperatures at
or above 105 will be widespread again across the lower elevations.
The excessive heat warning remains in effect today.
Some minor cooling is forecast for the sj valley, foothills, and
Kern County mountain valleys this weekend. While this may end the
run of very dangerous heat for these areas, Max temperatures will
remain hot and hazardous. A heat advisory has been issued across
the sj valley, foothills, and Kern County mountain valleys for
Saturday and Sunday. People should continue to avoid outdoor
activities, especially during the heat of the day. If you are
outside, wear light colored, loose fitting clothing if possible.
Take breaks, seek shade, and stay hydrated. Children and the
elderly are especially susceptible to the heat. Don't Forget to
provide water and shelter for pets and livestock too.
Also, excessive snow melt will continue with rivers and streams
running high and fast. The rivers may look inviting during the
heat, but the cold and fast moving waters are extremely dangerous.
The desert in Kern County will see little if any change in
temperatures this weekend. Highs will continue to climb to
dangerous levels of 106 to 113. Therefore, the excessive heat
warning remains in effect for the desert through Sunday.
An upper trough will move over northern California on Monday for
some more notable cooling. Highs by Tuesday are forecast to drop
below the century mark, but still a few degrees above late June
normals. Little change is expected next Wednesday through Friday.
A few afternoon and early evening thunderstorms remain possible
each day through Sunday. The best chances will be from Yosemite
np south to around Mount Whitney.
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 California interior during
the next 24 hours.
Air quality issues...
on Friday June 23 2017...unhealthy for sensitive groups in
Fresno...Kern...Madera and Tulare counties and Sequoia National
Park and Forest. Further information is available at valleyair.Org
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.
excessive heat warning until 11 PM PDT this evening caz089>095.
Heat advisory from noon Saturday to 9 PM PDT Sunday caz089>095.
Excessive heat warning until 9 PM PDT Sunday caz098-099.