794 
FXUS66 KHNX 232102
AFDHNX

Area Forecast Discussion
National Weather Service Hanford CA
202 PM PDT Thu Oct 23 2025


&&

.KEY MESSAGES...
1. Dense fog will occur over the next two nights and morning 
hours along the Highway’s 41, 99 and 198.

2. A Pacific Storm will drop through Northern California on 
Saturday. The storm will bring cooler temperatures and light 
precipitation to the area.

3. The weekend storm exit California on Sunday with warm and 
dry weather next week. This will allow for dense fog in the San 
Joaquin Valley.

4. Climate Prediction Center placing Central California under
above normal temperatures and normal for precipitation toward
the end of the month.

&&

.DISCUSSION...
As the cut-off area of low pressure exits the region and joins
up with the main pattern, a small ridge is expected to follow in
its place, which when combined with the recent precipitation in
the Valley, may lead to fog formation in the early morning
today, mainly along the Hwy 99 corridor. This is due to the
stable air aloft not allowing the drier air above the Valley to
mix with the saturated air near the surface. That surface air 
is than cooled through the night and condenses as it reaches its
dew point in the early morning, leading to fog formation. So we
may see more "sunrise surprise" fog this morning as we saw a few
mornings ago. Always remember to drive with caution and slow
down in foggy areas. 

After that small ridge exits the area tomorrow, a shallow trough
is expected to move through the Northwest and Northern
California this weekend. As of current forecasts, it is 
expected to graze Mariposa County, which may see a small amount 
of snowfall is the higher elevations of the Sierra Nevada, as 
will Yosemite NP. Previous forecasts had this trough coming in 
much deeper than current forecasts, which now have it much 
shallower, so much of the impact form this system will likely be
cooler temperatures and slightly elevated winds, but not much 
rainfall for the lower Counties in our CWA. 

Looking into next week, the upper level pattern is expected to
become mostly zonal flow, keeping the weather calm and
temperatures consistently near normal through at least next
Thursday. 

&&

.AVIATION...
VFR conditions will prevail across the central California
interior for the next 24 hours.

&&

.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...EW
aviation....Molina

weather.gov/hanford