Area Forecast Discussion
Issued by NWS San Joaquin Valley, CA

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FXUS66 KHNX 120152 AAA
AFDHNX

Area Forecast Discussion...UPDATED
National Weather Service San Joaquin Valley - Hanford CA
552 PM PST Mon Dec 11 2017

.UPDATE...
Updated Air Quality Issues section.

&&

.SYNOPSIS...
High pressure parked over the region will maintain our dry and
hazy conditions through the week, with continued mild days and
chilly nights.

&&

.PREV DISCUSSION... /issued 300 PM PST Mon Dec 11 2017/

DISCUSSION...A mid/upper level ridge of high pressure remains
entrenched over the western US in a rex block type pattern, with
a low parked underneath near central Baja. This pattern has been
keeping our area precipitation free in a very dry airmass, with
hazy and warmer than normal days, and chilly overnight lows,
running a few degrees below normal in lower elevations. Some high
level moisture is producing a mostly thin cirrus deck over the
region, but dry easterly flow in the lower levels is maintaining
very low humidities with poor overnight recoveries in the desert
and mountain areas, especially the Kern County and southern Tulare
County mountains.

Little change can be expected in this pattern, with persistent
conditions for us for the next few days. This means continued dry
mild and hazy days and frosty nights through the middle of the
week, as well as very low mountain and desert humidities.

By the end of the week, models drop a shortwave trough over the
ridge. Though there are some differing model solutions with this
feature, general consensus for us is for just some passing clouds
and slight improvement in humidities, with temperatures a few
degrees cooler by Saturday. Then continued dry and just slightly
warmer for the beginning of next week under the continued
influence of the ridge.

AVIATION...
Widespread MVFR visibility in haze and mist will persist in the San
Joaquin Valley, with areas of IFR and local LIFR/VLIFR in fog
developing between 04Z and 18Z Tuesday. Otherwise, VFR conditions
will prevail over the central CA interior during the next 24
hours.

&&

.AVIATION...
Widespread MVFR visibility in haze and mist will persist in the San
Joaquin Valley, with areas of IFR and local LIFR/VLIFR in fog
developing between 04Z and 18Z Tuesday. Otherwise, VFR conditions
will prevail over the central CA interior during the next 24 hours.

&&

.AIR QUALITY ISSUES...
On Tuesday December 12 2017... Unhealthy in Kern County. Unhealthy
for sensitive groups in Fresno... Kings and Tulare Counties.
Fireplace/Wood Stove Burning Status is: No Burning Unless
Registered in Fresno... Kings... Madera... Merced and Tulare
Counties. No Burning For All in Kern County.
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.

&&

$$

Synopsis/Discussion...JEB
AVN/FW...Molina

weather.gov/hanford



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