Area Forecast Discussion
Issued by NWS San Joaquin Valley, CA

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FXUS66 KHNX 042244
AFDHNX

Area Forecast Discussion
National Weather Service Hanford CA
344 PM PDT Thu Jun 4 2020


.UPDATE...Updated air quality issues section.

&&

.SYNOPSIS...
Gusty winds along the West Side Hills of the San Joaquin Valley
tonight. A few isolated thunderstorms will be possible along the
Sierra crest this evening. A better chance of thunderstorms will
occur on Friday over the Sierra and down into Kern County as well.
A cooling trend will begin on Friday with temperatures falling to
well below normal by Sunday. Breezy to windy conditions are likely
through the weekend. Trending warmer next week.

&&

.DISCUSSION...
A very hot early June day shaping up across lower elevations of
the central California interior. A strong upper ridge sits over
northern Mexico with the axis extending northward over the Four
Corners region. This puts us on the warm southwest flow side of
the ridge. 24hr trends show temperatures across the San Joaquin
Valley running up around 2-5 degrees. Highs are forecast to be
around 15 degrees above normal for the date. There is a chance
of tying or even breaking the current record high at Fresno for
today of 105 degrees. It`s less likely to reach the record high
in Bakersfield today, which is 107 degrees.

An upper low is continuing to spin around 400 miles southwest of
Point Conception this afternoon. Daytime heating has sparked some
convection over the Sierra, but thus far no showers have formed.
Have kept a slight chance in along the crest for this evening as
hi-resolution models suggest it is still possible. The low begins
to shift towards the southern California coast on Friday. Better
moisture and dynamics will result in a higher chance of showers
and thunderstorms Friday afternoon and night, extending down into
Kern County as well. The low opens up as a kicker upper trough
drops down from the northeast Pacific. A few showers cannot be
ruled out over the Sierra on Saturday, mainly from Yosemite NP to
Kings Canyon NP. Dry weather prevails Sunday into early next week.

A cooling trend will commence on Friday as the upper low nears the
coast. But temperatures are still expected to be around 3-7 degrees
above normal on Friday. Further cooling will occur over the weekend
resulting in highs falling to well below normal. Sunday`s highs are
forecast to be around 15 degrees below normal with mid 70s across
the SJ Valley. The upper trough will exit to the east early next
week with weaker ridging in its wake. The air mass quickly warms
up this time of year and highs will be back near normal by Tuesday
and a little above normal next Wednesday and Thursday.


&&


.AVIATION...
Isolated thunderstorms possible over the Sierra Nevada through
03z Friday and again after 18z Friday. Otherwise, VFR conditions
can be expected throughout the central California interior during
the next 24 hours.

&&

.AIR QUALITY ISSUES...
None.



&&

.CERTAINTY...

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
www.weather.gov/hnx/certainty.html for additional information
an/or to provide feedback.

&&

.HNX WATCHES/WARNINGS/ADVISORIES...
Heat Advisory until 7 PM PDT this evening for CAZ179>189.

Wind Advisory until 5 AM PDT Friday for CAZ179.

&&

$$

public...BSO/DCH
aviation....DCH

weather.gov/hanford


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