670 
FXUS66 KHNX 092115
AFDHNX

Area Forecast Discussion
National Weather Service San Joaquin Valley - Hanford CA
215 PM PDT Tue Oct 9 2018

.SYNOPSIS...
Dry weather will continue across the area through Wednesday then 
a chance of showers over the Southern Sierra Nevada on Thursday. 
Dry conditions will prevail Friday through the weekend. A cooling 
trend will take place Wednesday and Thursday followed by another 
warming trend Friday through the weekend.

&&

.DISCUSSION...Amplified but dry pattern continues with a strong 
upper ridge over the east Pacific and an upper trough over the
Rockies. The flow aloft has shifted to more northwesterly as an
upper low has dropped down over the Pacific Northwest. Visible
satellite imagery shows some fair weather cumulus developing in
the Sierra Nevada similar to yesterday. A few high clouds will
will pass over this afternoon as well. Temperatures are running
slightly warmer than yesterday and should top out right around
normal for this time of year. Winds are generally light right
now but some westerly gusts around 30 mph will develop through 
coastal passes this evening and gusts to around 40 mph will be 
possible through the Kern County mountain passes. A diminishing
trend is expected after midnight through sunrise.

Another s/wv trough currently near the Queen Charlotte Islands
will drop south to the central California coast on Wednesday. 
This will bring a little cooler temperatures to the district but 
there is little moisture to work with so just a few clouds are 
expected. Additional s/wv energy diving down on Thursday will
bring just enough moisture and dynamics for a chance of some light
showers over the Sierra on Thursday. Temperatures will nudge a
little lower as well. A closed upper low is forecast to form off 
the central/southern California coast by Friday, underneath the
strong EPAC ridge. Will continue to watch the track of Hurricane
Sergio as it is expected to cross over the Baja Peninsula as a
Tropical Storm on Friday. Models show a little moisture getting 
entrained in the offshore low but are keeping any precipitation 
to our south. Upper lows typically move very slowly and the models
often struggle to predict their track. Current prognostications
have it drifting towards northern Baja over the weekend and then 
over the lower Colorado River Valley early next week. A warming 
trend is forecast Friday into the weekend with temperatures a few 
degrees above normal. Little change is expected early next week.

&&

.AVIATION...
VFR conditions will prevail over the Central CA Interior for at 
least 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.php for additional information
an/or to provide feedback.

&&

.HNX Watches/Warnings/Advisories...
NONE.
&&

$$

public...DCH
avn/fw...DCH
synopsis...DCH

weather.gov/hanford