Arvin, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

197
FXUS66 KHNX 051207
AFDHNX

Area Forecast Discussion
National Weather Service Hanford CA
507 AM PDT Sun Apr 5 2026

.UPDATE...
Updated Aviation Section.

&&

.KEY MESSAGES...
1. Warming trend continues into Sunday.

2. The risk for fire starts remains elevated into the weekend
due to lowering humidity and warmer temperatures.

3. Another chance for unsettled weather as precipitation,
winds, and periodic thunderstorms return by the middle of next
week.

&&

.DISCUSSION...
A high pressure ridge that was previously over central
California is now pushing into the Great Basin region, leaving
behind southwesterly flow in its wake. Warm air from the
southwest will continue a warming trend into Sunday and Monday,
with expected temperatures up to 15 degrees above season
averages. For Sunday, ensemble guidance expresses a 70 to 80
percent probability to exceed 85 degrees in the San Joaquin
Valley, falling slightly to 60 to 70 percent on Monday. A
cooling trend will start on Tuesday as winds track out of the
northwest, however expected temperatures remain above normal for
Tuesday and Wednesday.

A developing low pressure system over the eastern Pacific will
gradually push eastward into California in the mid- to late-week
period, bringing chances for rainfall for much of the region
Thursday through Saturday. Between Friday and Saturday, there
is a 25 to 35 percent probability for more than one-tenth of an
inch across the San Joaquin Valley, with increasing
probabilities moving up in elevation. Little snowfall is
anticipated with this system as winds track out of the south to
southwest, resulting in snow levels largely between 8,000 to
8,500 feet. During the same time frame as above, there is only a
30 o 40 percent probability for snowfall greater than one inch
above these snow levels. The incoming moisture-rich air
interacting with the warmer temperatures in the valley and
foothill areas brings a threat for thunderstorms to develop each
afternoon starting Wednesday, with about a 10 to 15 percent
chance each day.


&&

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

&&

.FIRE WEATHER...
Fuel moisture continues on the downtrend into the weekend and
early next week due to warming temperatures resulting in lower
relative humidities. This especially rings true for the Mojave
Desert where minRH values are expected below 10 percent through
Sunday. The low RH values will extend further into the San
Joaquin Valley and Sierra Nevada, being between 20 and 25
percent for Sunday afternoon. Moisture pushing into the region
next week will help raise RH values, but also brings the risk
for lightning-induced fires from potential thunderstorm
development; current chances for storms is at 10 to 15 percent
each afternoon from Wednesday through Saturday.

&&

.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...McCoy
aviation....EW

weather.gov/hanford