Area Forecast Discussion
Issued by NWS San Joaquin Valley, CA

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FXUS66 KHNX 042319 AAA

Area Forecast Discussion...Updated
National Weather Service Hanford CA
419 PM PDT Tue Aug 4 2020

Updated Air Quality Issues section

Temperatures will trend downward through the middle of the week
as high pressure gives way to a couple of passing low pressure
systems. High pressure will then rebuild and a warming trend will
return Friday through the weekend. Dry conditions will continue
throughout the period.


Upper trough positioned just off the northern California coast
this afternoon with some minor cooling already occurring. 24hr
trends show temperatures are generally running down 1-4 degrees
from this time yesterday. Visible satellite imagery shows sunny
skies prevailing though attention is drawn to Kern County where
the Stagecoach wildfire is putting up a lot of smoke. The fire is
located south of Lake Isabella near Havilah. Conditions were very
dry and windy when the fire started yesterday afternoon and while
a little less dry and windy today, the fire remains quite active.

The trough will swing inland over NorCal on Wednesday ushering in
a noticeably cooler air mass. Temperatures will lower several more
degrees with highs in the lower 90s from Fresno County southward.
More significant cooling will occur farther north over Merced and
Madera Counties due to marine air spilling through the Sacramento
Delta and Pacheco Pass. Highs there will mainly be in the 80s and
the high in Los Banos is forecast to be only 81 degrees, which is
about 15 degrees below normal for early August. The southern San
Joaquin Valley and the Kern County Desert will see a little more
cooling on Thursday. High temperatures on Thursday are generally
expected to be 5-10 degrees below normal.

Models keeps some weak troughing over the region and suggest a
weak upper low forming just off the central CA coast on Friday.
Little movement of this low is progged through the weekend and
into early next week. The air mass will begin to modify Friday
with temperatures nudging up a few degrees. Further warming is
forecast through the weekend with highs returning to near normal.
The aforementioned upper low may begin to shift inland by Tuesday
and bring some modest cooling.


VFR conditions will prevail at MCE, MER, FAT, VIS, and BFL
through at least then next 24 hours.




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 for additional information and/or
to provide feedback.





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