FNUS86 KMTR 232142 FWLMTR ECCDA Discussions National Weather Service SAN FRANCISCO BAY AREA 242 PM PDT Sun Aug 23 2026 ##################################################################### ## ## ## Discussions from the latest FWF below ## ## ## ##################################################################### ...Discussion from SFOFWFMTR... The marine layer remains compressed to around 1000 feet with fluctuations between 1000 to 1200 feet expected this week. There is a low (5%) chance of storms developing across northern Napa County early Monday morning due to the arrival of a weak shortwave trough. Confidence that storms will develop is low and any convective potential decreases by Monday afternoon. Coastal drizzle and patchy fog are likely directly along the coastline through the week. Slightly above normal temperatures and very dry conditions continue above the marine layer with poor daytime humidity values between 10-20%. Little to no humidity recovery is expected at the higher elevations with overnight RH values peaking between 20-30%. Diurnally breezy winds continue across favored locations through the upcoming week. ...Discussion from SFOFWFEKA... High pressure rebuilds with warmer temperatures in the 90s and lower RHs in the teens and 20s. Overnight recoveries will be moderate to good in the lower elevations and poor in the higher elevations. Winds generally remain light and terrain driven with typical afternoon breezes. A deeper marine layer returns mid next week. ##################################################################### ## ## ## Complete a discussion for each ECCDA segment below ## ## When done click transmit, product sent as KMTRFWLMTR ## ## ## ##################################################################### ECC010-240945- St Helena ECC Dispatch- DISCUSSION FOR Marin and Sonoma and Napa Counties 242 PM PDT Sun Aug 23 2026 The marine layer remains compressed to around 1000 feet with fluctuations between 1000 to 1200 feet expected this week. There is a low (5%) chance of storms developing across northern Napa County early Monday morning due to the arrival of a weak shortwave trough. Confidence that storms will develop is low and any convective potential decreases by Monday afternoon. Coastal drizzle and patchy fog are likely directly along the coastline through the week. Slightly above normal temperatures and very dry conditions continue above the marine layer with poor daytime humidity values between 10-20%. Little to no humidity recovery is expected at the higher elevations with overnight RH values peaking between 20-30%. Diurnally breezy winds continue across favored locations through the upcoming week. $$ ECC014-240945- Morgan Hill ECC Dispatch- DISCUSSION FOR Alameda and Contra Costa and Santa Clara Counties 242 PM PDT Sun Aug 23 2026 The marine layer remains compressed to around 1000 feet with fluctuations between 1000 to 1200 feet expected this week. There is a low (5%) chance of storms developing across northern Napa County early Monday morning due to the arrival of a weak shortwave trough. Confidence that storms will develop is low and any convective potential decreases by Monday afternoon. Coastal drizzle and patchy fog are likely directly along the coastline through the week. Slightly above normal temperatures and very dry conditions continue above the marine layer with poor daytime humidity values between 10-20%. Little to no humidity recovery is expected at the higher elevations with overnight RH values peaking between 20-30%. Diurnally breezy winds continue across favored locations through the upcoming week. $$ ECC013-240945- Felton ECC Dispatch- DISCUSSION FOR Santa Cruz and San Mateo Counties 242 PM PDT Sun Aug 23 2026 The marine layer remains compressed to around 1000 feet with fluctuations between 1000 to 1200 feet expected this week. There is a low (5%) chance of storms developing across northern Napa County early Monday morning due to the arrival of a weak shortwave trough. Confidence that storms will develop is low and any convective potential decreases by Monday afternoon. Coastal drizzle and patchy fog are likely directly along the coastline through the week. Slightly above normal temperatures and very dry conditions continue above the marine layer with poor daytime humidity values between 10-20%. Little to no humidity recovery is expected at the higher elevations with overnight RH values peaking between 20-30%. Diurnally breezy winds continue across favored locations through the upcoming week. $$ ECC018-240945- Monterey ECC Dispatch- DISCUSSION FOR Monterey and San Benito County 242 PM PDT Sun Aug 23 2026 The marine layer remains compressed to around 1000 feet with fluctuations between 1000 to 1200 feet expected this week. There is a low (5%) chance of storms developing across northern Napa County early Monday morning due to the arrival of a weak shortwave trough. Confidence that storms will develop is low and any convective potential decreases by Monday afternoon. Coastal drizzle and patchy fog are likely directly along the coastline through the week. Slightly above normal temperatures and very dry conditions continue above the marine layer with poor daytime humidity values between 10-20%. Little to no humidity recovery is expected at the higher elevations with overnight RH values peaking between 20-30%. Diurnally breezy winds continue across favored locations through the upcoming week. $$