Area Forecast Discussion
Issued by NWS San Joaquin Valley, CA

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FXUS66 KHNX 231002
AFDHNX

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

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

&&

.DISCUSSION...
Weak upper low will drift south into SOCAL and open up by
Thursday. Continued easterly flow will bring moisture across the
Sierra with continued chance of afternoon and evening
thunderstorms today. As the low slips south, afternoon convection
will be less in areal coverage on Thursday. Storms could be
strong once again today with heavy rain and hail in some of the
stronger storms.

Upper level ridge of high pressure will build in from the EPAC
and merge with a developing four corners ridge. Temperatures will
rise well above normal Saturday and continue through Wednesday.
Heat risk levels appear to be the worst on Monday with widespread
100-105 in the San joaquin Valley, which is about 5 to 15 degrees
above normal for this time of year. With the ridge overhead, it
will be dry and hot across the region. After experiencing near to
even below normal temperatures over the past several days, it
will feel significantly hotter with the upcoming heat spell.

The ridge weakens slightly by Wednesday as temps will drop a
couple of degrees. Guidance might be to early to cool things off
and could be bleeding climo into the extended temps. The center
of the ridge will shift slightly east into Nevada, however
the ridge axis extending west into the EPAC.

&&

.AVIATION... Isolated to scattered thunderstorms will occur over the
Sierra after 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.

&&

.AIR QUALITY ISSUES...
Please see SFOAQAHNX for an Air Quality Alert.

None.

&&

.CERTAINTY...

The level of certainty for days 1 and 2 is high.
The level of certainty for days 3 through 7 is high.

Certainty levels include low...medium...and high. Please visit
www.weather.gov/hnx/certainty.php for additional information
an/or to provide feedback.

&&

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

$$

public...JDB
avn/fw...JEB
synopsis...JDB

weather.gov/hanford



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