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Area Forecast Discussion (AFD)

Issued by San Joaquin Valley, CA (HNX)

FXUS66 KHNX 152122

Area Forecast Discussion
National Weather Service San Joaquin Valley - Hanford CA
222 PM PDT Mon Oct 15 2018

Dry conditions are expected to continue with temperatures 
remaining near normal for the remainder of the week.


A low pressure system that moved south through the Great Basin
into western Arizona yesterday evening, along with a strong
surface pressure gradient across the Sierra created a mono wind
pattern over the Sierra Nevada from Yosemite to Kings Canyon
overnight and early this morning. These winds were strongest in
the northeast-oriented canyons, and especially down through the
North Fork/Bass Lake area where numerous trees were blown down.
The winds dropped off quickly after daybreak as the upper jet 
moved southward. The easterly winds also increased across the Kern
County Mountains this morning and caused humidity to drop into 
the single digits in many places. The winds continue to gust 
through the canyons, but speeds have been gradually decreasing 
this afternoon. Expect the winds to continue to decrease through 
this evening.

The upper low will remain over the Desert Southwest for the next 
several days with high pressure over the eastern Pacific. This 
will keep a dry northeasterly flow aloft over the region for most
of this week. The higher ridges of the Sierra Nevada may continue
to experience locally gusty winds up to 35 mph tonight and early 
Tuesday morning. Otherwise, without the upper support of the jet, 
winds will be lighter through the end of the week. Temperatures 
will remain near or just a few degrees above normal. The very low 
humidity in the mountains today will moderate as the winds 

By Friday, a Rex Block develops as high pressure over the Pacific
noses into northern California and the Pacific Northwest while low
pressure remains near southern California. This pattern may allow
for some moisture to move up from the south around the low.
Confidence is low regarding how far north the moisture will move 
and whether or not it will bring any precipitation to the Sierra 
Nevada on Sunday or next Monday. For now have increased clouds,
but have left any mention of precipitation out of the forecast.
Will have to watch this pattern evolve over the next several days. 


Locally gusty easterly winds over 35 knots can be expected along the 
Sierra crest through 00z Wednesday. Otherwise, VFR conditions will 
prevail over the central California interior during the next 24 





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 for additional information
an/or to provide feedback.


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