Porterville, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

489
FXUS66 KHNX 070503
AFDHNX

Area Forecast Discussion
National Weather Service Hanford CA
1003 PM PDT Sun Jul 6 2025

.UPDATE...
Updated Aviation Section.

&&

.KEY MESSAGES...
1. Elevated fire weather conditions for Northwest Kern County
Monday afternoon due to low RH around 20 percent and stronger
wind gusts near 30 MPH.

2. Temperatures near season averages across the region today
before a gradual warm up into the triple digits later this week.

3. Low RH values 15 to 25 percent will stretch across much of
the San Joaquin Valley and Sierra Nevada with values 5 to 10
percent in the Mojave Desert. RH will decrease over the region
later in the week with warming temperatures.

&&

.DISCUSSION...
A cutoff area of low pressure is currently progressing
southward along the Pacific coast, and will come to a
standstill around 200 miles from Monterey Bay overnight into
tomorrow. At the same time, an area of high pressure is building
over the Four Corners region. The combination of these synoptic
features will cause the flow over central California to
propagate from the southwest, driving warmer but near-average
temperatures to the region through midweek. The orientation of
the low is expected to cause stronger winds to develop in the
lee side and wind-prone areas of the region Monday afternoon.
Locations such as Lake Isabella and west of Lost Hills have a
50 to 60 percent chance or wind gusts to exceed 30 miles per
hour; RH values near 20 percent in these areas will result in an
elevated threat for fire weather conditions.

As the week progresses, the aforementioned area of high
pressure will slide to the west, centering over central and
southern California Thursday. This placement of the high will
bring a return to triple digit temperatures in the San Joaquin
Valley through the weekend with the following daily
probabilities.

            Thu   Fri   Sat   Sun
Bakersfield 45%   95%   80%   75%
Coalinga    45%   65%   20%   35%
Fresno      45%   95%   80%   65%
Hanford     45%   95%   75%   65%
Madera      45%   90%   65%   50%
Merced      25%   80%   30%   20%
Visalia     45%   90%   80%   75%

The Kern Desert has a 40 to 90 percent chance for temperatures
to exceed 105 degrees during the same time period, with Inyokern
and Ridgecrest having the greatest of these probabilities. The
warmer temperatures later in the week will also cause relative
humidities to decrease. Widespread minRH values 10 to 20 percent
are anticipated for the San Joaquin Valley and Sierra Nevada;
values less than 10 percent are expected for the desert areas
through the forecast period.

&&


.AVIATION...
06Z Update:

VFR conditions will prevail for the next 24 hours across the Central
California Interior.

&&

.AIR QUALITY ISSUES...
ISSUED:  07/05/2025 15:10
EXPIRES: 07/06/2025 23:59

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...McCoy/EW

weather.gov/hanford