248
FNUS86 KMTR 201157
FWLMTR
ECCDA DISCUSSIONS
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA
457 AM PDT THU AUG 20 2026
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## DISCUSSIONS FROM THE LATEST FWF BELOW ##
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..DISCUSSION FROM SFOFWFMTR
THE MARINE LAYER REMAINS COMPRESSED TO AROUND 1000 FEET WITH POOR
OVERNIGHT RECOVERIES (20-30%) AND POOR DAYTIME HUMIDITY RETENTION
(10-30%) CONTINUING ABOVE IT. CONDITIONS IMPROVE SLIGHTLY FRIDAY
INTO THE WEEKEND AS THE MARINE LAYER DEEPENS TO BETWEEN 1000 TO
1500 FEET. THIS IS CAUSED BY AN APPROACHING UPPER LEVEL TROUGH THAT
WILL BRING A COOLING TREND, IMPROVING DAYTIME AND OVERNIGHT RH
VALUES, CLOUDY MORNINGS, AND DIURNALLY BREEZY AFTERNOON AND EVENING
WINDS ACROSS FAVORED LOCATIONS. THE ONE EXCEPTION WILL BE THE
INTERIOR CENTRAL COAST WHERE HOT, DRY DAYTIME CONDITIONS PREVAIL
THROUGH THE FORECAST PERIOD.
..DISCUSSION FROM SFOFWFEKA
GENERALLY NEAR NORMAL TEMPERATURES ARE EXPECTED THROUGH MID WEEK
WITH HIGH TEMPERATURES IN THE LOW 90S FOR INTERIOR VALLEYS AND
MINIMUM RH AS LOW AS 20 PERCENT. WINDS ARE GENERALLY GENTLE AND
TERRAIN DRIVEN. MARINE INFLUENCE WILL CONTINUE TO INCREASE LATE IN
THE WEEK, INCREASING HUMIDITY AND SOME AFTERNOON MIXING THROUGH
FRIDAY. THERE IS A VERY SLIGHT (5%) CHANCE OF ISOLATED DRY
THUNDERSTORMS EARLY FRIDAY MORNING AND THROUGH THE DAY FOCUSED IN
TRINITY AND NORTHERN HUMBOLDT COUNTIES. ANY STORMS WILL BE WEAK AND
MOSTLY DRY. BREEZY CONDITIONS DEVELOP FRIDAY AND SATURDAY.
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## COMPLETE A DISCUSSION FOR EACH ECCDA SEGMENT BELOW ##
## WHEN DONE CLICK TRANSMIT, PRODUCT SENT AS KMTRFWLMTR ##
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ECC010-210000-
ST HELENA ECC DISPATCH-
DISCUSSION FOR MARIN AND SONOMA AND NAPA COUNTIES
457 AM PDT THU AUG 20 2026
THE MARINE LAYER REMAINS COMPRESSED TO AROUND 1000 FEET WITH POOR
OVERNIGHT RECOVERIES (20-30%) AND POOR DAYTIME HUMIDITY RETENTION
(10-30%) CONTINUING ABOVE IT. CONDITIONS IMPROVE SLIGHTLY FRIDAY
INTO THE WEEKEND AS THE MARINE LAYER DEEPENS TO BETWEEN 1000 TO
1500 FEET. THIS IS CAUSED BY AN APPROACHING UPPER LEVEL TROUGH THAT
WILL BRING A COOLING TREND, IMPROVING DAYTIME AND OVERNIGHT RH
VALUES, CLOUDY MORNINGS, AND DIURNALLY BREEZY AFTERNOON AND EVENING
WINDS ACROSS FAVORED LOCATIONS. THE ONE EXCEPTION WILL BE THE
INTERIOR CENTRAL COAST WHERE HOT, DRY DAYTIME CONDITIONS PREVAIL
THROUGH THE FORECAST PERIOD.
ECC014-210000-
MORGAN HILL ECC DISPATCH-
DISCUSSION FOR ALAMEDA AND CONTRA COSTA AND SANTA CLARA COUNTIES
457 AM PDT THU AUG 20 2026
THE MARINE LAYER REMAINS COMPRESSED TO AROUND 1000 FEET WITH POOR
OVERNIGHT RECOVERIES (20-30%) AND POOR DAYTIME HUMIDITY RETENTION
(10-30%) CONTINUING ABOVE IT. CONDITIONS IMPROVE SLIGHTLY FRIDAY
INTO THE WEEKEND AS THE MARINE LAYER DEEPENS TO BETWEEN 1000 TO
1500 FEET. THIS IS CAUSED BY AN APPROACHING UPPER LEVEL TROUGH THAT
WILL BRING A COOLING TREND, IMPROVING DAYTIME AND OVERNIGHT RH
VALUES, CLOUDY MORNINGS, AND DIURNALLY BREEZY AFTERNOON AND EVENING
WINDS ACROSS FAVORED LOCATIONS. THE ONE EXCEPTION WILL BE THE
INTERIOR CENTRAL COAST WHERE HOT, DRY DAYTIME CONDITIONS PREVAIL
THROUGH THE FORECAST PERIOD.
ECC013-210000-
FELTON ECC DISPATCH-
DISCUSSION FOR SANTA CRUZ AND SAN MATEO COUNTIES
457 AM PDT THU AUG 20 2026
THE MARINE LAYER REMAINS COMPRESSED TO AROUND 1000 FEET WITH POOR
OVERNIGHT RECOVERIES (20-30%) AND POOR DAYTIME HUMIDITY RETENTION
(10-30%) CONTINUING ABOVE IT. CONDITIONS IMPROVE SLIGHTLY FRIDAY
INTO THE WEEKEND AS THE MARINE LAYER DEEPENS TO BETWEEN 1000 TO
1500 FEET. THIS IS CAUSED BY AN APPROACHING UPPER LEVEL TROUGH THAT
WILL BRING A COOLING TREND, IMPROVING DAYTIME AND OVERNIGHT RH
VALUES, CLOUDY MORNINGS, AND DIURNALLY BREEZY AFTERNOON AND EVENING
WINDS ACROSS FAVORED LOCATIONS. THE ONE EXCEPTION WILL BE THE
INTERIOR CENTRAL COAST WHERE HOT, DRY DAYTIME CONDITIONS PREVAIL
THROUGH THE FORECAST PERIOD.
ECC018-210000-
MONTEREY ECC DISPATCH-
DISCUSSION FOR MONTEREY AND SAN BENITO COUNTY
457 AM PDT THU AUG 20 2026
THE MARINE LAYER REMAINS COMPRESSED TO AROUND 1000 FEET WITH POOR
OVERNIGHT RECOVERIES (20-30%) AND POOR DAYTIME HUMIDITY RETENTION
(10-30%) CONTINUING ABOVE IT. CONDITIONS IMPROVE SLIGHTLY FRIDAY
INTO THE WEEKEND AS THE MARINE LAYER DEEPENS TO BETWEEN 1000 TO
1500 FEET. THIS IS CAUSED BY AN APPROACHING UPPER LEVEL TROUGH THAT
WILL BRING A COOLING TREND, IMPROVING DAYTIME AND OVERNIGHT RH
VALUES, CLOUDY MORNINGS, AND DIURNALLY BREEZY AFTERNOON AND EVENING
WINDS ACROSS FAVORED LOCATIONS. THE ONE EXCEPTION WILL BE THE
INTERIOR CENTRAL COAST WHERE HOT, DRY DAYTIME CONDITIONS PREVAIL
THROUGH THE FORECAST PERIOD.
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