Area Forecast Discussion
Issued by NWS San Joaquin Valley, CA

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FXUS66 KHNX 232318

Area Forecast Discussion
National Weather Service San Joaquin Valley - Hanford CA
418 PM PDT Wed Aug 23 2017

.UPDATE...Updated air quality issues to include SFOAQAHNX.


.SYNOPSIS...Near normal temperatures will persist across central
California through Friday with a warming trend this weekend into
early next week. Otherwise...afternoon/early evening thunderstorms
will be possible over the Sierra Nevada through Thursday.


.DISCUSSION...An active weather pattern continues for areas far to
the north of central California, in western Canada and the northern
reaches of the Pacific Northwest. However, here in central
California we have had M.O.T.S. conditions for the last week or
so. M.O.T.S. meaning more of the same. We will see some change but
not for the better, as we will have a large broad 500 mb high
pressure with progged 594 decameter heights retrograding from
northern Mexico and south central conus into the region. This
will bring a warming trend and we will once again see 100+
temperatures again in the San Joaquin Valley and Kern County
desert areas. Most likely one of summers last gasps at hot
temperatures across the area.

Air quality issues will also increase with the large cap coming
into place. Especially, with some fires still burning in the
region. In the meantime, afternoon and early evening thunderstorms
will be possible over the Sierra crest through Thursday. As the
ridging moves into the area, thunderstorms threats will diminish.
Ridging looks to remain the main feature through most of next
week. It will be questionable but there is the chance of a
northwesterly flow developing late next week and that should usher
in some cooler air and even a few weak systems.


.AVIATION... Isolated to scattered thunderstorms will occur over the
Sierra during 20z today through 03z Thursday. Areas of smoke are
possible Near Yosemite National Park in association with the South
Fork Wildfire. Otherwise VFR conditions can be expected over much of
the central CA interior during the next 24 hours.


Please see SFOAQAHNX for an Air Quality Alert

On Thursday August 24 2017... Unhealthy for sensitive groups in
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 medium.

Certainty levels include low...medium...and high. Please visit for additional information
an/or to provide feedback.


.HNX Watches/Warnings/Advisories...


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