Area Forecast Discussion
Issued by NWS San Joaquin Valley, CA

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FXUS66 KHNX 201047

Area Forecast Discussion
National Weather Service San Joaquin Valley - Hanford CA
347 AM PDT Thu Jul 20 2017

Temperatures near normal through Friday then will begin to warm
up again this weekend. Dry conditions except for the possibility
of an isolated thunderstorms over the Sierra Nevada Sunday through


Detwiler Fire continues to be the major concern in the CWA as
terrain driven winds and low afternoon RH values will create
favorable conditions for continued fire growth today. We are
seeing decent overnight RH values in the 50s near the fire and
continued light and variable winds attm but GOES 16 fire detection
channels are showing explosive fire behavior near Lake McClure.

Center of upper level high pressure in the Central US shifted far
enough east to allow for some cooling yesterday...eventhough BFL
stayed at triple digits. We are forecasting double digits across
the entire San Joaquin Valley today. The upper ridge is forecast
to redevelop again on Saturday across NV and temperatures are
expected to quickly increase back into the triple digits on
Saturday, with the hottest day on Sunday...with several locations
approaching the critical 105 mark.

Monsoon moisture is forecast to return to the Sierra late Sunday.
PWAT`s remain dry and the potential for dry lightning is
possible. Deeper moisture moves north Monday through Wednesday
with the best dynamics associated with a potential MCV on Tuesday
night into Wednesday. Showalter Index gets more impressive for
mid level convection Tuesday night and Wed.

Closed low center is continued to be advertised off EKA early
next week which will help keep temps in check with only slightly
above normal numbers in the forecast through mid week next week.


Areas of MVFR and local IFR visibilities in smoke from area
wildfires. Otherwise, VFR conditions will prevail across the
central CA interior during the next 24 hours.


Please see SFOAQAHNX



The level of certainty for days 1 and 2 is high.
The level of certainty for days 3 through 7 is high.

Certainty levels include low...medium...and high. Please visit for additional information
an/or to provide feedback.


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