FNUS86 KMTR 201139

FWLMTR



ECCDA Discussions

National Weather Service SAN FRANCISCO BAY AREA

439 AM PDT Wed Aug 20 2025



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##            Discussions from the latest FWF below                ##

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...Discussion from SFOFWFMTR...



Building high pressure will bring hot and dry conditions to the

district through the weekend. Thermal belts will be active with mild

and dry conditions at night in the hills. Daily afternoon sea

breezes will bring periods of elevated fire weather conditions that

coincide with hot and dry conditions. Monsoon moisture will move in

from the south beginning Friday bringing higher humidity to the

region. Will need to monitor for increasing clouds and very low

chance of high based convection.





...Discussion from SFOFWFEKA...



Hot and very dry weather will begin to quickly build across the

interior today. By Thursday, highs will generally reach above 100 in

the hottest valleys with RH in the low teens or even single digits.

Overnight recoveries will become increasingly poor at mid and upper

elevations. Marine influence will become  increasingly shallow and

restricted to the coast. Similar hot and dry conditions will

continue through the weekend. There is a very slight chance of dry

thunderstorms over high interior terrain by  Sunday afternoon into

early next week.





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##       Complete a discussion for each ECCDA segment below        ##

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ECC010-202345-

St Helena ECC Dispatch-

DISCUSSION FOR Marin and Sonoma and Napa Counties

439 AM PDT Wed Aug 20 2025



Building high pressure will bring hot and dry conditions to the

district through the weekend. Thermal belts will be active with mild

and dry conditions at night in the hills. Daily afternoon sea

breezes will bring periods of elevated fire weather conditions that

coincide with hot and dry conditions. Monsoon moisture will move in

from the south beginning Friday bringing higher humidity to the

region. Will need to monitor for increasing clouds and very low

chance of high based convection.



$$



ECC014-202345-

Morgan Hill ECC Dispatch-

DISCUSSION FOR Alameda and Contra Costa and Santa Clara Counties

439 AM PDT Wed Aug 20 2025



Building high pressure will bring hot and dry conditions to the

district through the weekend. Thermal belts will be active with mild

and dry conditions at night in the hills. Daily afternoon sea

breezes will bring periods of elevated fire weather conditions that

coincide with hot and dry conditions. Monsoon moisture will move in

from the south beginning Friday bringing higher humidity to the

region. Will need to monitor for increasing clouds and very low

chance of high based convection.



$$



ECC013-202345-

Felton ECC Dispatch-

DISCUSSION FOR Santa Cruz and San Mateo Counties

439 AM PDT Wed Aug 20 2025



Building high pressure will bring hot and dry conditions to the

district through the weekend. Thermal belts will be active with mild

and dry conditions at night in the hills. Daily afternoon sea

breezes will bring periods of elevated fire weather conditions that

coincide with hot and dry conditions. Monsoon moisture will move in

from the south beginning Friday bringing higher humidity to the

region. Will need to monitor for increasing clouds and very low

chance of high based convection.



$$



ECC018-202345-

Monterey ECC Dispatch-

DISCUSSION FOR Monterey and San Benito County

439 AM PDT Wed Aug 20 2025



Building high pressure will bring hot and dry conditions to the

district through the weekend. Thermal belts will be active with mild

and dry conditions at night in the hills. Daily afternoon sea

breezes will bring periods of elevated fire weather conditions that

coincide with hot and dry conditions. Monsoon moisture will move in

from the south beginning Friday bringing higher humidity to the

region. Will need to monitor for increasing clouds and very low

chance of high based convection.



$$