Area Forecast Discussion
Issued by NWS San Joaquin Valley, CA

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000
FXUS66 KHNX 112247
AFDHNX

Area Forecast Discussion
National Weather Service San Joaquin Valley - Hanford CA
347 PM PDT Fri Aug 11 2017

.SYNOPSIS...A weak trough of low pressure will remain just off
the northern California coast through the weekend with deepening
occurring on Monday and Tuesday. Temperatures will show little
change through Sunday with cooling on Monday and Tuesday. High
pressure will rebuild by the middle of next week for a warming
trend.

&&

.DISCUSSION...Water vapor satellite imagery shows an area of very
dry air over the forecast area as a weak trough of low pressure
remains off the Northwest California coast. Visible imagery
indicates sunny skies over the entire area along with the smoke
plumes from area fires including the Butte, Empire and Indian. Due
to the dry and rather stable air over the Sierra, other than some
cumulus build ups this afternoon, convection will be nil.
Temepratures are trending up along the west side of the San
Joaqin Valley where a deeper marine layer yesterday kept readings
down a little.

For the next couple of days, forecast models show little change in
the pattern with the weak trough remaining offshore and heights
showing little change. By Monday some deepening of the trough is
projected by the GFS model and this should allow for a deeper
marine layer to develop along with heights at 500 mb lowering
about 30-40 meters. Given this, Tuesday should be the coolest of
the forecast period however highs near normal will occur.

In the Wednesday through Friday time frame, models project a
rebuilding of high pressure over the region and a resulting
increase of heights. No hint of any return of the monsoon
moisture through the end of next week.

&&

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

&&

.AIR QUALITY ISSUES...
On Saturday August 12 2017... Unhealthy for sensitive groups in
Fresno County and Sequoia National Park and Forest.
Further information is available at Valleyair.org

&&

.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...Dudley
avn/fw...Dudley
synopsis...Dudley

weather.gov/hanford



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