Area Forecast Discussion
Issued by NWS San Joaquin Valley, CA

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351
FXUS66 KHNX 180800
AFDHNX

Area Forecast Discussion
National Weather Service Hanford CA
100 AM PDT Sat Oct 18 2025


.KEY MESSAGES...
1. Fog development expected for the San Joaquin Valley (along the
Highway 99 corridor) Saturday (20-30% chance for quarter mile
visibility).

2. Clear and dry conditions will prevail through the weekend.
Another disturbance is expected to cross the area toward the
middle of next week.

3. Probability of reaching 80 degrees this weekend and early
next week will range from 60% to 80%. Cooling expected toward
the middle of next week.

&&

.DISCUSSION...
Warm and dry conditions will continue this weekend as afternoon
highs now reaching seasonal normal values. The ridge
responsible for the warm conditions is now over California and
expected to remain overhead for another day or two. Therefore,
with Probability of Exceedance (PoE) of reaching 80 degrees
across the San Joaquin Valley will remain high at percentages of
50% to 80% over the weekend period. A disturbance moving
through the Pacific Northwest and Northern California will keep
temperatures in a steady-state environment with minimal day to
day changes. By Wednesday, the area of weakness off the Southern
California Coast will shift ashore and usher is a cooling trend
with some cloud cover and a very slight chance of mountain
showers.

While warming temperatures will make fog development more
challenging, a 20% to 30% chance of fog (locally dense) will
exist over the rural areas near Hanford-Corcoran and near
Merced. By Sunday and Monday, continued drying will lower the
probability of fog to less than 10%.

Latest long range ensemble are placing a moderate risk (40%-60%)
of heavy precipitation over portions of Central California by
next Saturday. The entire Central California will be under a
slight risk (20%-40%) for the same time-frame.

&&

.AVIATION...
VFR conditions will prevail across the central California
interior through 12Z Saturday. Patchy fog developing in the San
Joaquin Valley between 12Z and 18Z Friday with a 20-30 percent
chance for IFR/LIFR conditions.

&&

.AIR QUALITY ISSUES...
None.

&&

.CERTAINTY...

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.html for additional information
and/or to provide feedback.

&&

.HNX WATCHES/WARNINGS/ADVISORIES...
None.

&&

$$

Public/Aviation....Molina

weather.gov/hanford