Area Forecast Discussion
Issued by NWS San Joaquin Valley, CA

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FXUS66 KHNX 270009 AAA

Area Forecast Discussion...Updated
National Weather Service San Joaquin Valley - Hanford CA
508 PM PDT Wed Jul 26 2017

.UPDATE...Updated arir quality section.


.SYNOPSIS...Low pressure over Northern California will move east
of the area tonight leaving the area under a dry southwest flow
pattern for the next several days.


.DISCUSSION...Satellite and radar show one area of developing
showers and thunderstorms south of Edwards AFB while elsewhere
some cumulus "streets" are noted over the Sierra. Meanwhile in the
bigger picture, water vapor imagery shows an area of low pressure
over Northern California moving to the east along with a
pronounced southwest flow of dry air moving into California.

Over the next few days forecast models keep a weak trough of low
pressure off the California coast and hold on to the southwest
flow. This will effectively keep nearly all convection thwarted to
the east of the area with just a slightest of chances on the
Sierra crest beginning Saturday.

By Sunday forecast models change the pattern with high pressure
strengthening over the Great Basin and a resulting light east to
northeast flow aloft. Given this, some threat of a thunderstorm
over the Sierra crest cannot be ruled out due to upslope
convergence near the crest. A somewhat stronger southeast flow is
then progged to develop during the week and this may bring some
additional monsoon moisture into the region.&&

Isolated afternoon thunderstorms through 06z over the Kern County
mountains and desert and Southern Sierra Nevada. Otherwise, VFR
conditions will prevail across the central CA interior during the
next 24 hours.


On Thursday July 27 2017... Unhealthy for sensitive groups in
Kern County.

Further information is available at



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 for additional information
an/or to provide feedback.


.HNX Watches/Warnings/Advisories...


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