Area Forecast Discussion
Issued by NWS San Joaquin Valley, CA
FXUS66 KHNX 201030
Area Forecast Discussion
National Weather Service San Joaquin Valley - Hanford CA
330 AM PDT THU OCT 20 2016
Above normal temperatures will prevail through the first half of the
weekend. A storm system will approach northern California this
weekend, bringing a cooling trend to central California Sunday into
.DISCUSSION...An upper level ridge of high pressure will build
over southern and central California today, resulting in a
significant warming trend. Temperatures this afternoon will
warm 6 to 8 degrees compared to yesterday afternoon. These
temperatures are around 5 degrees above normal for the middle of
October. Friday will see additional warming across central
California with San Joaquin Valley temperatures in the mid 80s.
The desert will warm into the upper 80s to near 90 degrees.
On Saturday, a storm system off the British Columbia coastline
will begin to shift slowly south. This will result in a very
subtle cooling trend over the region on Saturday. More noticable
cooling will occur on Sunday as the upper low shifts south,
positioned off the Pacific Northwest coast. Even with this
cooling, temperatures will still remain between 2 and 5 degrees
above normal on Sunday.
Additionally, on Sunday mid level moisture around Baja California
will move north northeast into southern California, possibly
bringing an increase in cloudiness to Kern county. Any
precipitation with this mid level moisture should remain south and
east of Kern county, although a stray shower cannot be ruled out,
especially near the Grapevine early Monday morning.
On Monday the upper low off the Pacific Northwest coast will
deepen with the upper trough shifting south, pushing the southern
California moisture east. At the same time, precipitation will
begin to impact northern California. The upper low will remain
nearly stagnant through Tuesday and begin shifting slowly north on
Wednesday. At this time, most of the precipitation looks to remain
north of Yosemite, with the forecast models trending dryer and
dryer each run. One thing we know for sure is that central
California can expect below normal temperatures with breezy
onshore winds the first half of next week.
VFR conditions will prevail at all terminals through the next 24
.AIR QUALITY ISSUES...
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.