Weather Service Report


896 
FXUS66 KHNX 222245 AAA
AFDHNX

Area Forecast Discussion...UPDATED
National Weather Service Hanford CA
345 PM PDT Wed Sep 22 2021

.UPDATE...Updated AIR QUALITY ISSUES section.

&&

.SYNOPSIS...Dry weather and above normal temperatures will 
continue over the area along with periods of smoke through the
weekend. A cooling trend is expected to take place next week with
temperatures lowering to below normal by the middle of next week.

&&

.DISCUSSION...The upper ridge that brought a return of above 
normal temperatures across our area on Tuesday has shifted east of
our area as an upper trough is currently through the PAC NW. 
While the moisture and dynamics that are associated with this 
system have remained well to the north of our area, some shortwave
energy pushing through Socal has provided for some orographic 
lifting which has resulted in some cumulus build-ups over southern
Kern County. In addition, smoke from the Windy and KNP Fires are 
continuing to impact portions of Tulare County portion of the 
Sierra Nevada as well as the the San Joaquin Valley with reduced 
visibility.

The trough is expected to drop southeast through the Great Basin 
tonight and early Thursday. This will result in a northwest flow
over our area on Thursday which should provide the San Joaquin 
Valley with a short period of relief from the smoke. Daytime 
temperatures are expected to be 3-6 Deg F lower than today as
cooler air moves in overnight.

With the trough then moving east of our area on Thursday night
coinciding with an upper ridge building into Norcal on Friday, 
the upper flow will turn offshore and once again smoke from the 
Windy and KNP fires could impact the San Joaquin Valley.
Temepratures will rise back up to well above normal level 
although smoke impacts could lower daytime highs by several 
degrees in some locations. The warm and dry airmass is now 
expected to prevail across our area through the upcoming weekend 
as a the cutoff upper low that had been progged to impact our area
over the weekend is now progged by blended model guidance to 
remain to the southeast of our area.

Medium range ensemble means are bringing a fairly strong trough 
through Norcal by next Monday night will will result in much
cooler temperatures across our area and a slight chance of 
showers near the Sierra Nevada crest by the middle of next week.

&&

.AVIATION...In the San Joaquin Valley, the foothills and higher 
elevations of the Sierra Nevada, areas of MVFR visibilities can be
expected due to smoke and haze with local IFR visibilities persisting
in the vicinity of wildfires in the Tulare county mountains during
the next 24 hours. Elsewhere, VFR conditions will prevail for the
next 24 hours.

&&

.AIR QUALITY ISSUES...
Please see the Air Quality Alert (SFOAQAHNX) which is in effect 
until Monday morning.

On Thursday September 23 2021...Hazardous in Sequoia National Park
and Forest. Unhealthy in Tulare County. Unhealthy for sensitive groups
in Fresno...Kern and Kings Counties. Further information is available
at Valleyair.org

&&

.CERTAINTY...

The level of certainty for days 1 and 2 is medium.
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.html for additional information
an/or to provide feedback.

&&

.HNX WATCHES/WARNINGS/ADVISORIES...
None.
&&

$$

Public/Aviation/FW...DS
PIO/IDSS.............CMC

weather.gov/hanford

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Western Regional Climate Center, wrcc@dri.edu