Area Forecast Discussion
Issued by NWS San Joaquin Valley, CA

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FXUS66 KHNX 231005
AFDHNX

Area Forecast Discussion
National Weather Service San Joaquin Valley - Hanford CA
305 AM PDT Sat Sep 23 2017

.SYNOPSIS...A large upper low pressure system to the northeast of
our area will maintain cooler than average temperatures through
the weekend as a northerly flow prevails over the area. A gradual
warming trend and dry weather are expected next week as high
pressure builds inland and strengthens over the region.

&&

.DISCUSSION...The longwave trough and associated upper-level low
that has been persisting over the Western United States will
provide another relatively cool day across Central California.
Northerly flow aloft will prevail over the region while the ridge
of high pressure remains off the coast. We expect mainly dry
conditions for today and into next week.

The offshore ridge is expected to move inland during next week, so
a gradual warming trend is in store. An offshore flow will likely
develop during the first half of the week, which will aid in this
warming. Above average temperatures will return by Tuesday, as
the high pressure ridge builds further inland.

For the middle to late next week, the models show an upper-level
low developing over the Desert Southwest due to a disturbance
moving around the ridge of high pressure, though with some
disagreement on its location. This feature appears to have little
effect on our weather for now, but bears watching. A subtropical
moisture tap is possible with this low, but at this time, any
moisture is progged to remain well to the east of our region, such
as over AZ and the Great Basin. Overall, we have a dry forecast
for this weekend and into much of next week. It appears the warm
temperatures will be here to stay once they begin, at least until
next weekend.

&&

.AVIATION...VFR conditions will prevail throughout the central
California interior during the next 24 hours.

&&

.AIR QUALITY ISSUES...
None.

&&

.CERTAINTY...

The level of certainty for days 1 and 2 is medium.
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...BSO
avn/fw...DCH
synopsis...BSO

weather.gov/hanford



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