Land Management Forecasts
Issued by NWS San Francisco Bay Area, CA
Issued by NWS San Francisco Bay Area, CA
718 FNUS86 KMTR 010743 FWLMTR ECCDA Discussions National Weather Service SAN FRANCISCO BAY AREA 1243 AM PDT Mon Sep 1 2025 ##################################################################### ## ## ## Discussions from the latest FWF below ## ## ## ##################################################################### ...Discussion from SFOFWFMTR... ...ELEVATED FIRE WEATHER THREAT IN THE INTERIOR MOUNTAINS THROUGH MONDAY EVENING DUE TO LOW RH AND MODERATE AFTERNOON BREEZES... One more day of warm and dry conditions leading to elevated fire weather concerns before a cooling trend sets in Tuesday, and will continue through the remainder of the extended forecast. Elevated interior locations and locations above the compressed marine layer closer to the coast will see poor RH recovery overnight remaining in the 10%-25% range. Onshore flow will increase this afternoon out ahead of an upper level low approaching from the southwest while we transition from the influence of ridging to our east and the arrival of the offshore disturbance to our southwest. We are also watching a low probability-high impact scenario for elevated thunderstorms as early as late this afternoon that will continue into Tuesday. The North Bay, Bay Area and East Bay Hills are the favored locations for the non-zero chances of convection, with cloud to ground lightning and gusty winds as the primary concern. ...Discussion from SFOFWFEKA... Temperatures are expected to warm several degrees this afternoon and again Tuesday afternoon. Afternoon RH will generally be in the teens and will remain poor overnight on the mid and upper slopes. Winds will generally be diurnally and terrain driven Monday. There is a slight chance of afternoon and evening thunderstorms on Tuesday, mainly in Trinity county. In addition, gusty winds combined with hot temperatures and low relative humidity will increase fire danger. Wednesday through the end of the week gradual cooling is expected with highs mainly in the 80s by Saturday. ##################################################################### ## ## ## Complete a discussion for each ECCDA segment below ## ## When done click transmit, product sent as KMTRFWLMTR ## ## ## ##################################################################### ECC010-011945- St Helena ECC Dispatch- DISCUSSION FOR Marin and Sonoma and Napa Counties 1243 AM PDT Mon Sep 1 2025 ...ELEVATED FIRE WEATHER THREAT IN THE INTERIOR MOUNTAINS THROUGH MONDAY EVENING DUE TO LOW RH AND MODERATE AFTERNOON BREEZES... One more day of warm and dry conditions leading to elevated fire weather concerns before a cooling trend sets in Tuesday, and will continue through the remainder of the extended forecast. Elevated interior locations and locations above the compressed marine layer closer to the coast will see poor RH recovery overnight remaining in the 10%-25% range. Onshore flow will increase this afternoon out ahead of an upper level low approaching from the southwest while we transition from the influence of ridging to our east and the arrival of the offshore disturbance to our southwest. We are also watching a low probability-high impact scenario for elevated thunderstorms as early as late this afternoon that will continue into Tuesday. The North Bay, Bay Area and East Bay Hills are the favored locations for the non-zero chances of convection, with cloud to ground lightning and gusty winds as the primary concern. $$ ECC014-011945- Morgan Hill ECC Dispatch- DISCUSSION FOR Alameda and Contra Costa and Santa Clara Counties 1243 AM PDT Mon Sep 1 2025 ...ELEVATED FIRE WEATHER THREAT IN THE INTERIOR MOUNTAINS THROUGH MONDAY EVENING DUE TO LOW RH AND MODERATE AFTERNOON BREEZES... One more day of warm and dry conditions leading to elevated fire weather concerns before a cooling trend sets in Tuesday, and will continue through the remainder of the extended forecast. Elevated interior locations and locations above the compressed marine layer closer to the coast will see poor RH recovery overnight remaining in the 10%-25% range. Onshore flow will increase this afternoon out ahead of an upper level low approaching from the southwest while we transition from the influence of ridging to our east and the arrival of the offshore disturbance to our southwest. We are also watching a low probability-high impact scenario for elevated thunderstorms as early as late this afternoon that will continue into Tuesday. The North Bay, Bay Area and East Bay Hills are the favored locations for the non-zero chances of convection, with cloud to ground lightning and gusty winds as the primary concern. $$ ECC013-011945- Felton ECC Dispatch- DISCUSSION FOR Santa Cruz and San Mateo Counties 1243 AM PDT Mon Sep 1 2025 ...ELEVATED FIRE WEATHER THREAT IN THE INTERIOR MOUNTAINS THROUGH MONDAY EVENING DUE TO LOW RH AND MODERATE AFTERNOON BREEZES... One more day of warm and dry conditions leading to elevated fire weather concerns before a cooling trend sets in Tuesday, and will continue through the remainder of the extended forecast. Elevated interior locations and locations above the compressed marine layer closer to the coast will see poor RH recovery overnight remaining in the 10%-25% range. Onshore flow will increase this afternoon out ahead of an upper level low approaching from the southwest while we transition from the influence of ridging to our east and the arrival of the offshore disturbance to our southwest. We are also watching a low probability-high impact scenario for elevated thunderstorms as early as late this afternoon that will continue into Tuesday. The North Bay, Bay Area and East Bay Hills are the favored locations for the non-zero chances of convection, with cloud to ground lightning and gusty winds as the primary concern. $$ ECC018-011945- Monterey ECC Dispatch- DISCUSSION FOR Monterey and San Benito County 1243 AM PDT Mon Sep 1 2025 ...ELEVATED FIRE WEATHER THREAT IN THE INTERIOR MOUNTAINS THROUGH MONDAY EVENING DUE TO LOW RH AND MODERATE AFTERNOON BREEZES... One more day of warm and dry conditions leading to elevated fire weather concerns before a cooling trend sets in Tuesday, and will continue through the remainder of the extended forecast. Elevated interior locations and locations above the compressed marine layer closer to the coast will see poor RH recovery overnight remaining in the 10%-25% range. Onshore flow will increase this afternoon out ahead of an upper level low approaching from the southwest while we transition from the influence of ridging to our east and the arrival of the offshore disturbance to our southwest. We are also watching a low probability-high impact scenario for elevated thunderstorms as early as late this afternoon that will continue into Tuesday. The North Bay, Bay Area and East Bay Hills are the favored locations for the non-zero chances of convection, with cloud to ground lightning and gusty winds as the primary concern. $$