Area Forecast Discussion
Issued by NWS San Joaquin Valley, CA

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FXUS66 KHNX 220016 AAA

Area Forecast Discussion...Updated
National Weather Service San Joaquin Valley - Hanford CA
516 PM PDT Fri Sep 21 2018

Updated Air Quality Section

.SYNOPSIS...High pressure will remain over the region
through Saturday then weaken a bit on Sunday and Monday with a
slight cooling trend taking place. The high will rebuild during
the middle of next week resulting in another period of above
normal temperatures. Dry weather will continue across the area
through next week.


.DISCUSSION...An area of high pressure is keeping clear skies,
dry conditions and warmer than normal temepratures across our
area today as it continues to strengthen. Rises in heights and
thicknesses today have resulted in a warming trend with
temperatures running 4 to 7 DEG F above yday at this time.

WRF indicating not much change on Saturday as the high remains
the predominant feature. Daytime temperatures might be a degree or
two lower in response to lowering heights as a low pressure
system pushes into southwestern Canada. A more significant cooling
will occur on Sunday and Monday as another low pushes through the
PAC NW. In addition to the synoptic cooling advertised by the
weakening high. The system might be able to pull in some marine
cooled air into the lower elevations if onshore p-grads strengthen

The medium range models and their ensemble means are in better
agreement today and suggest that any cooling that takes place on
Sunday and Monday will no longer be noticable by the middle of
next week as model consensus is indicating a stronger ridge
building over the region. This ridge is expected to split and the
northern portion off the BC coast will become undercut by a
Pacific low and form a rex block between 130W and 140W. This will
likely result in another period of dry conditions with much above
normal temperatures for our area from the middle of next week
through the end of next week.


.AVIATION...VFR conditions can be expected throughout the Central
CA Interior for at least the next 24 hours.


On Saturday, September 22nd, 2018, unhealthy for sensitive groups in
Fresno, Kern, Kings, and Tulare Counties and Sequoia National Park
and Forest.



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 for additional information
an/or to provide feedback.


.HNX Watches/Warnings/Advisories...NONE.



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