Area Forecast Discussion
Issued by NWS San Joaquin Valley, CA

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
FXUS66 KHNX 110915

Area Forecast Discussion
National Weather Service San Joaquin Valley - Hanford CA
115 AM PST Mon Dec 11 2017

.SYNOPSIS...A very long lived pattern of strong high pressure
over the Pacific Northwest and low pressure over Baja California
will keep the weather dry for the next several days.


.DISCUSSION...The big dry continues...relative humidity values
over the Kern County Mountains and Southern Sierra of Tulare
county are very low with many single digits noted as of 100 am.
Winds remain offshore as the upper low over central Baja combines
with the High pressure system along the Oregon coast to keep a
pronounced easterly flow across the region. Some high clouds are
noted on water vapor imagery moving northward towards the Central
California Interior from the Baja low but that is really just
it...thin high clouds.

Forecast models continue to keep the very persistent ridge of high
pressure along the west coast for the next week or longer with
periods off a rex block pattern setting up. This very stable
pattern can persist for long periods of time and no credible
change is noted in the longer range models. So...dry air will
remain over the forecast area with the San Joaquin Valley
becoming increasingly murky as the airmass at low levels will
continue to gain particulates as winds will be very light. In a
normal year with some substantial precipitation this pattern would
be ideal for widespread fog and stratus, however the big dry has
not allowed this to happen yet.


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 03Z and 18Z Mon. Otherwise, VFR conditions will
prevail over the central CA interior during the next 24 hours.


On Monday December 11 2017... Unhealthy for sensitive groups in
Fresno... Kern... Kings and Tulare Counties. Fireplace/Wood Stove
Burning Status is: No Burning Unless Registered in Fresno...
Kern... Kings... Madera... Merced and Tulare Counties. Further
information is available at



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 for additional information
an/or to provide feedback.


.HNX Watches/Warnings/Advisories...


synopsis...Dudley is the U.S. government's official web portal to all federal, state and local government web resources and services.