Area Forecast Discussion
Issued by NWS San Joaquin Valley, CA

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FXUS66 KHNX 222100

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

.SYNOPSIS...A large upper low pressure system to the northeast of
our area will maintain cool and unsettled conditions across our
area through tonight with showers possible over the Southern
Sierra Nevada. Temperatures will remain cooler than normal 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...A large upper trough remains situated over the
western CONUS with the main upper low center currently over
northern NV. Energy rotating around this upper low is providing
for a cyclonic flow aloft and enough lift over the Southern Sierra
Nevada for scattered showers through this evening with the snow
level between 7000 and 8000 feet. Aside from the Southern Sierra
Nevada, skies have been mainly clear across our area today with
temperatures running several degrees below seasonal normals.

The longwave trough is expected to remain over the western CONUS
through the weekend as the upper low center drops southeast
through the Great Basin. This will maintain a cool and dry
northerly flow over Central CA on Saturday and Sunday with a
continuation of below normal temperatures across our area with a
slow diurnal warming trend taking place each day.

WRF indicating the low will drop into the four corners area by
Monday with a dry upper ridge off the CA coast. Rises in heights
and thicknesses will result in temperatures warming to near
seasonal normals on Monday.

The medium range models are in good agreement with building the
ridge inland Tuesday through the end of next week which will
result in a continuation of dry weather and the ongoing warming
trend with temperatures expected to be above normal from Tuesday
through the remainder of the week.


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





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 for additional information
an/or to provide feedback.


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



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