Area Forecast Discussion
Issued by NWS San Joaquin Valley, CA

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FXUS66 KHNX 212233 AAA

Area Forecast Discussion...UPDATED
National Weather Service San Joaquin Valley - Hanford CA
333 PM PDT Wed Jun 21 2017


High pressure will continue to bring above normal temperatures
and dry conditions through the weekend. Slight cooling will bring
temperatures near normal beginning Tuesday.


Broad high pressure continues to sit over the region bringing
dangerous heat conditions to the San Joaquin Valley and the Kern
County Desert. Today there was a silver lining for some parts of
the CWA, primarily Merced County, where a weak marine intrusion
from a nearly 2000 foot marine layer this morning per the Fort Ord
sounding. This did allow for some cooling, about 10 degrees
cooler than 24 hours before at 9 AM in some locations. However,
this cooling effect was a very local event and the rest of the CWA
were not as lucky. High temperatures for the majority of the SJV
and KCD areas will come close to the 110 degree mark. This is
expected to continue through Friday and therefore we still have
the excessive heat warning in affect. The continued heat will only
exacerbate the stress on individuals and animals across the area.
Be sure to stay hydrated and make sure your pets/animals have
ample water and shade. Also, remember to never leave people or
animals in an enclosed vehicle, even for short durations, as
temperatures inside a enclosed car can reach a fatal level very
quickly. Cooling off in area rivers can be tempting but with the
snowmelt causing rivers to run higher, fast, and very cold, which
makes it a very dangerous activity. Drownings and even hypothermia
are two of the biggest dangers, don`t forget that rocks are very
slippery and so even getting close to a river can become a big
problem in a hurry.

Speaking of rivers, the Kings river has had some instances of
flooding due to upstream river releases, so be vigilant on any
sudden river rises or flooding.

Afternoon thunderstorms will be possible over the Sierra crest the
next few days, so if camping or hiking in these areas keep weather
aware. I do apologize if I appear to have an anti-fun tone today
but we truly do want to keep everyone safe. Some cooling is on the
way and looks to move into the area by Tuesday as a low pressure
system from the north moves into the region next week. I know this
normally would not sound great but after this prolonged period of
heat, areas across the SJV and KCD will see high temperatures only
in the 90s. So we do have that going for us.


Isolated thunderstorms are possible over the higher elevations of
the Southern Sierra Nevada thru 04Z Thu and again after 21Z Thu.
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



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 for additional information
an/or to provide feedback.


.HNX Watches/Warnings/Advisories...
Excessive Heat Warning until 11 PM PDT Friday CAZ089>095-098-099.



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