Area Forecast Discussion
Issued by NWS San Joaquin Valley, CA

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FXUS66 KHNX 220912
AFDHNX

Area Forecast Discussion
National Weather Service San Joaquin Valley - Hanford CA
212 AM PDT Fri Sep 22 2017

.SYNOPSIS...Scattered showers are expected over the mountains
this afternoon and evening as a low pressure system to our east
keeps cool, unsettled conditions over the area. Temperatures will
remain cooler than normal across the area through the upcoming
weekend as the low pressure system remains over the Great Basin.
Otherwise, a gradual warming trend is likely starting early next
week as high pressure builds over the region.

&&

.DISCUSSION...The upper-level low system responsible for yesterday`s
cooling and precipitation remains to the northeast of the region.
For today, scattered rain and snow showers will redevelop over
the higher elevations of the Sierra Nevada as some upper-level
impulses rotate around the upper-level low. Elsewhere in the
Central California interior, another unseasonably cool day is in
store as the longwave trough remains in place over much of the
West Coast. In addition, locations in some of the mountain areas,
especially along the north-facing slopes in Kern County, can
expect to see mostly cloudy skies this morning.

The trough will slowly progress eastward during the weekend. The
upper- level low pressure system will remain over the Great Basin
through at least Saturday, while temperatures will remain below
average and a cool northerly flow persists. Meanwhile, a ridge of
high pressure will build off the coast and then slowly move inland
during early next week. As the ridge begins to strengthen inland,
high temperatures will trend towards average by Monday.

From Tuesday through next Friday, while high pressure continues
to build over the region, we can expect temperatures to further
warm, or return to above average. During this period, high
temperatures at the warmest locations are forecast to reach mainly
the lower 90s. At this time, low temperatures in most locations are
expected to be relatively cool, or perhaps slightly above average,
due to a dry airmass in place. No return of moisture is anticipated
during much of next week.

&&

.AVIATION...
Local MVFR ceilings can be expected along the north facing
slopes of the Tehachapi mountains until 17z today. Otherwise,
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...Durfee
synopsis...BSO

weather.gov/hanford


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