Area Forecast Discussion
Issued by NWS San Joaquin Valley, CA

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FXUS66 KHNX 181209

Area Forecast Discussion
National Weather Service San Joaquin Valley - Hanford CA
509 AM PDT Fri Aug 18 2017

.SYNOPSIS...Near normal temperatures with the possibility of
Sierra Nevada thunderstorms each afternoon and evening for the
next several days.


.DISCUSSION...A weakness in the upper ridge over the region
helped to trigger some thunderstorms over the Sierra yesterday
and continues to move moisture and a few clouds westward across
our area in the cyclonic flow around the feature. Our temperatures
meanwhile are running around 3-6 degrees above 24 hrs ago.

Expect similar thunderstorm activity today and Saturday as the
weak circulation drifts slowly southward. By Sunday, thunderstorm
chances could increase slightly and spread southward through the
Sierra as flow turns more southeasterly around the developing low
pressure center and additional moisture is drawn into the region.
This weak low is then progged to swing slowly inland across
southern CA during early next week, maintaining Sierra
thunderstorm chances through midweek.

Drier west to northwest flow will then settle in as a more
significant low pressure trough moves into the US west coast,
bringing an end to the convection for the latter part of next

Temperatures are expected to trend slightly upward during the
next couple of days to a few degrees above climo, with triple
digit highs returning to many San Joaquin Valley and desert
locales. Next week will see temperatures drop back to near or
slightly below seasonal averages under the influence of the
developing low pressure areas.


VFR conditions will prevail across the central CA interior during
the next 24 hours.





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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