815
FNUS86 KMTR 212021
FWLMTR

ECCDA Discussions
National Weather Service SAN FRANCISCO BAY AREA
121 PM PDT Tue Jul 21 2026

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...Discussion from SFOFWFMTR...

A shallow marine layer is forecast to develop overnight and
moreso into Wednesday morning allowing for a slight cooling and
moistening trend. Coastal and valley locations will see relief,
but thermal belting in the higher terrain will keep things warm
and dry overnight. Gradual warming and drying trend Friday into
the weekend.


...Discussion from SFOFWFEKA...

Thunderstorms are possible again on Tuesday, but the chances are
low. Wednesday there is a slight chance for thunderstorms in
northern Trinity county again. Hot temperatures and low afternoon
RH are expected again Tuesday with some cooling expected Wednesday
and through the rest of the week. Locally stronger westerly winds
are also possible late in the week.


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##       Complete a discussion for each ECCDA segment below        ##
##      When done click transmit, product sent as KMTRFWLMTR       ##
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ECC010-220830-
St Helena ECC Dispatch-
DISCUSSION FOR Marin and Sonoma and Napa Counties
121 PM PDT Tue Jul 21 2026

A shallow marine layer is forecast to develop overnight and
moreso into Wednesday morning allowing for a slight cooling and
moistening trend. Coastal and valley locations will see relief,
but thermal belting in the higher terrain will keep things warm
and dry overnight. Gradual warming and drying trend Friday into
the weekend.

$$

ECC014-220830-
Morgan Hill ECC Dispatch-
DISCUSSION FOR Alameda and Contra Costa and Santa Clara Counties
121 PM PDT Tue Jul 21 2026

A shallow marine layer is forecast to develop overnight and
moreso into Wednesday morning allowing for a slight cooling and
moistening trend. Coastal and valley locations will see relief,
but thermal belting in the higher terrain will keep things warm
and dry overnight. Gradual warming and drying trend Friday into
the weekend.

$$

ECC013-220830-
Felton ECC Dispatch-
DISCUSSION FOR Santa Cruz and San Mateo Counties
121 PM PDT Tue Jul 21 2026

A shallow marine layer is forecast to develop overnight and
moreso into Wednesday morning allowing for a slight cooling and
moistening trend. Coastal and valley locations will see relief,
but thermal belting in the higher terrain will keep things warm
and dry overnight. Gradual warming and drying trend Friday into
the weekend.

$$

ECC018-220830-
Monterey ECC Dispatch-
DISCUSSION FOR Monterey and San Benito County
121 PM PDT Tue Jul 21 2026

A shallow marine layer is forecast to develop overnight and
moreso into Wednesday morning allowing for a slight cooling and
moistening trend. Coastal and valley locations will see relief,
but thermal belting in the higher terrain will keep things warm
and dry overnight. Gradual warming and drying trend Friday into
the weekend.

$$