FXUS66 KHNX 172302
Area Forecast Discussion
National Weather Service San Joaquin Valley - Hanford CA
402 PM PDT Fri Aug 17 2018
.UPDATE...Updated air quality issues section.
.SYNOPSIS...High pressure builds over central California for the
weekend resulting in dry and hot conditions. Most high
temperatures across the San Joaquin Valley will reach the low
100s. It will also be hot along the Sierra foothills and coastal
range, where fire danger remains high.
.DISCUSSION...Heights aloft begin to build tonight and Saturday
over the region. Dry heat will be common with generally light
surface wind under the ridge. Sunday looks to be the hottest,
especially in the eastern Kern County desert. Will have to watch
Heat Risk values for parts of the Mojave Desert on Sunday. No heat
highlights needed as of yet, but it bears watching.
Otherwise, synoptic low over the Pacific Northwest will be a
feature to watch early next week, as it tries to dig into northern
California late Monday into Tuesday. Much cooler air to remain
well north of the forecast area, but a slight cool down looks to
occur for central California. Some marine air should result on
Monday with a better push of this airmass on Tuesday and possibly
into Wednesday. Far northern forecast area, east of Pacheco Pass,
should feel it the most.
Regardless, it will remain dry with an increasing pressure
gradient next week. This will result in at least breezy conditions
from the high Sierra Nevada to the Kern County Mountains Tuesday
into Wednesday. Above normal temperatures this weekend will fall
to near normal most of next week. Even the overnight temperatures
should be comfortable.
.AVIATION...VFR conditions will prevail across the central
California interior during the next 24 hours. However, it should
become more hazy by Saturday afternoon, particularly near any
.AIR QUALITY ISSUES...
Please see SFOAQAHNX for an Air Quality Alert.
On Saturday August 18 2018... Unhealthy for sensitive groups in
Fresno and Kern Counties and Sequoia National Park and Forest.
Further information is available at Valleyair.org
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.
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