187
FNUS86 KMTR 152154
FWLMTR
ECCDA DISCUSSIONS
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA
254 PM PDT MON SEP 15 2025
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## DISCUSSIONS FROM THE LATEST FWF BELOW ##
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..DISCUSSION FROM SFOFWFMTR
...ELEVATED FIRE WEATHER CONDITIONS ACROSS THE INTERIOR THROUGH
WEDNESDAY DUE TO WARM TEMPERATURES AND LOW HUMIDITY...NEAR
CRITICAL CONDITIONS LATE WEDNESDAY THROUGH FRIDAY DUE TO A CHANCE
FOR THUNDERSTORMS AND POSSIBLE DRY LIGHTNING...THE RELATIVE
HUMIDITY HAS DROPPED ANYWHERE FROM 20-40% FROM THIS TIME YESTERDAY
AS A WARMER, DRIER AIR MASS SETTLES IN. TEMPERATURES ARE CLIMBING
INTO THE 90S ACROSS THE INTERIOR WITH 70S AND 80S ALONG THE
COAST. SIMILAR WARM AND DRY WEATHER WILL CONTINUE THROUGH
WEDNESDAY. STRONG THERMAL BELTING WILL SUPPRESS HUMIDITY
RECOVERIES AT ELEVATIONS ABOVE 1,500 FEET. FORTUNATELY THE WINDS
LOOK TO REMAIN RELATIVELY LIGHT AND MOSTLY ONSHORE DURING THIS
EVENT. FUELS WILL RESPOND TO THE DRIER WEATHER, AND THE REGIONAL
ENERGY RELEASE COMPONENTS ARE MOVING BACK TO NORMAL AS THE WEEK
GOES ON. THE REMNANTS OF TROPICAL STORM MARIO WILL BRING A ROBUST
PUSH OF MOISTURE FROM S-N STARTING LATE WEDNESDAY. THIS MOISTURE
WILL INITIALLY ARRIVE IN THE UPPER ATMOSPHERE. WITH DRY AIR
REMAINING IN THE LOWER LEVELS, THIS SET UP BRINGS A CHANCE FOR
HIGH-BASED, DRY THUNDERSTORMS. THE INITIAL THREAT IS TO THE
CENTRAL COAST WEDNESDAY NIGHT BEFORE SPREADING NORTH THURSDAY AND
FRIDAY. AS THE EVENT UNFOLDS, STORMS SHOULD TRANSITION FROM DRY TO
WET, WITH A BETTER CHANCE OF BENEFICIAL RAIN REACHING THE GROUND
AND HELPING SUPPRESS THE IGNITION THREAT FROM LIGHTNING STRIKES.
IN THE EARLY STAGES (ESPECIALLY WEDNESDAY NIGHT) THE IGNITION
THREAT IS ELEVATED SINCE THE DRY LIGHTNING THREAT SUCCEEDS A
PERIOD OF WARM, DRY WEATHER. THUNDERSTORMS (BOTH DRY AND WET) ALSO
BRING LOCALIZED ERRATIC, GUSTY WINDS THAT CAN CAUSE RAPID SPREAD
OF NEW OR EXISTING FIRES.
..DISCUSSION FROM SFOFWFEKA
UNSEASONABLY WARM AND DRY CONDITIONS WILL PERSIST THROUGH TUESDAY
AND AID IN QUICKLY DRYING OUT FUELS. INTERIOR VALLEY HIGHS WILL BE
IN THE MID 90S WITH HUMIDITY AS LOW AS THE UPPER TEENS. STRONG
THERMAL BELTS WILL MAINTAIN POOR OVERNIGHT RECOVERY AT MID AND UPPER
ELEVATIONS. WINDS WILL BE MOSTLY GENTLE AND TERRAIN DRIVEN. DAYTIME
CONDITIONS WILL EASE LATER IN THE WEEK WITH MORE MOISTURE ENTERING
THE AREA. THERE WILL BE A SLIGHT CHANCE (20%) OF SEMI-DRY
THUNDERSTORMS THURSDAY AND FRIDAY AFTERNOONS MOSTLY FOCUSED AROUND
THE YOLLA BOLLYS AND OVER MENDOCINO AND LAKE COUNTIES WITH SOME
SLIGHT POTENTIAL FURTHER NORTH.
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## COMPLETE A DISCUSSION FOR EACH ECCDA SEGMENT BELOW ##
## WHEN DONE CLICK TRANSMIT, PRODUCT SENT AS KMTRFWLMTR ##
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ECC010-161000-
ST HELENA ECC DISPATCH-
DISCUSSION FOR MARIN AND SONOMA AND NAPA COUNTIES
254 PM PDT MON SEP 15 2025
...ELEVATED FIRE WEATHER CONDITIONS ACROSS THE INTERIOR THROUGH
WEDNESDAY DUE TO WARM TEMPERATURES AND LOW HUMIDITY...NEAR
CRITICAL CONDITIONS LATE WEDNESDAY THROUGH FRIDAY DUE TO A CHANCE
FOR THUNDERSTORMS AND POSSIBLE DRY LIGHTNING...THE RELATIVE
HUMIDITY HAS DROPPED ANYWHERE FROM 20-40% FROM THIS TIME YESTERDAY
AS A WARMER, DRIER AIR MASS SETTLES IN. TEMPERATURES ARE CLIMBING
INTO THE 90S ACROSS THE INTERIOR WITH 70S AND 80S ALONG THE
COAST. SIMILAR WARM AND DRY WEATHER WILL CONTINUE THROUGH
WEDNESDAY. STRONG THERMAL BELTING WILL SUPPRESS HUMIDITY
RECOVERIES AT ELEVATIONS ABOVE 1,500 FEET. FORTUNATELY THE WINDS
LOOK TO REMAIN RELATIVELY LIGHT AND MOSTLY ONSHORE DURING THIS
EVENT. FUELS WILL RESPOND TO THE DRIER WEATHER, AND THE REGIONAL
ENERGY RELEASE COMPONENTS ARE MOVING BACK TO NORMAL AS THE WEEK
GOES ON. THE REMNANTS OF TROPICAL STORM MARIO WILL BRING A ROBUST
PUSH OF MOISTURE FROM S-N STARTING LATE WEDNESDAY. THIS MOISTURE
WILL INITIALLY ARRIVE IN THE UPPER ATMOSPHERE. WITH DRY AIR
REMAINING IN THE LOWER LEVELS, THIS SET UP BRINGS A CHANCE FOR
HIGH-BASED, DRY THUNDERSTORMS. THE INITIAL THREAT IS TO THE
CENTRAL COAST WEDNESDAY NIGHT BEFORE SPREADING NORTH THURSDAY AND
FRIDAY. AS THE EVENT UNFOLDS, STORMS SHOULD TRANSITION FROM DRY TO
WET, WITH A BETTER CHANCE OF BENEFICIAL RAIN REACHING THE GROUND
AND HELPING SUPPRESS THE IGNITION THREAT FROM LIGHTNING STRIKES.
IN THE EARLY STAGES (ESPECIALLY WEDNESDAY NIGHT) THE IGNITION
THREAT IS ELEVATED SINCE THE DRY LIGHTNING THREAT SUCCEEDS A
PERIOD OF WARM, DRY WEATHER. THUNDERSTORMS (BOTH DRY AND WET) ALSO
BRING LOCALIZED ERRATIC, GUSTY WINDS THAT CAN CAUSE RAPID SPREAD
OF NEW OR EXISTING FIRES.
ECC014-161000-
MORGAN HILL ECC DISPATCH-
DISCUSSION FOR ALAMEDA AND CONTRA COSTA AND SANTA CLARA COUNTIES
254 PM PDT MON SEP 15 2025
...ELEVATED FIRE WEATHER CONDITIONS ACROSS THE INTERIOR THROUGH
WEDNESDAY DUE TO WARM TEMPERATURES AND LOW HUMIDITY...NEAR
CRITICAL CONDITIONS LATE WEDNESDAY THROUGH FRIDAY DUE TO A CHANCE
FOR THUNDERSTORMS AND POSSIBLE DRY LIGHTNING...THE RELATIVE
HUMIDITY HAS DROPPED ANYWHERE FROM 20-40% FROM THIS TIME YESTERDAY
AS A WARMER, DRIER AIR MASS SETTLES IN. TEMPERATURES ARE CLIMBING
INTO THE 90S ACROSS THE INTERIOR WITH 70S AND 80S ALONG THE
COAST. SIMILAR WARM AND DRY WEATHER WILL CONTINUE THROUGH
WEDNESDAY. STRONG THERMAL BELTING WILL SUPPRESS HUMIDITY
RECOVERIES AT ELEVATIONS ABOVE 1,500 FEET. FORTUNATELY THE WINDS
LOOK TO REMAIN RELATIVELY LIGHT AND MOSTLY ONSHORE DURING THIS
EVENT. FUELS WILL RESPOND TO THE DRIER WEATHER, AND THE REGIONAL
ENERGY RELEASE COMPONENTS ARE MOVING BACK TO NORMAL AS THE WEEK
GOES ON. THE REMNANTS OF TROPICAL STORM MARIO WILL BRING A ROBUST
PUSH OF MOISTURE FROM S-N STARTING LATE WEDNESDAY. THIS MOISTURE
WILL INITIALLY ARRIVE IN THE UPPER ATMOSPHERE. WITH DRY AIR
REMAINING IN THE LOWER LEVELS, THIS SET UP BRINGS A CHANCE FOR
HIGH-BASED, DRY THUNDERSTORMS. THE INITIAL THREAT IS TO THE
CENTRAL COAST WEDNESDAY NIGHT BEFORE SPREADING NORTH THURSDAY AND
FRIDAY. AS THE EVENT UNFOLDS, STORMS SHOULD TRANSITION FROM DRY TO
WET, WITH A BETTER CHANCE OF BENEFICIAL RAIN REACHING THE GROUND
AND HELPING SUPPRESS THE IGNITION THREAT FROM LIGHTNING STRIKES.
IN THE EARLY STAGES (ESPECIALLY WEDNESDAY NIGHT) THE IGNITION
THREAT IS ELEVATED SINCE THE DRY LIGHTNING THREAT SUCCEEDS A
PERIOD OF WARM, DRY WEATHER. THUNDERSTORMS (BOTH DRY AND WET) ALSO
BRING LOCALIZED ERRATIC, GUSTY WINDS THAT CAN CAUSE RAPID SPREAD
OF NEW OR EXISTING FIRES.
ECC013-161000-
FELTON ECC DISPATCH-
DISCUSSION FOR SANTA CRUZ AND SAN MATEO COUNTIES
254 PM PDT MON SEP 15 2025
...ELEVATED FIRE WEATHER CONDITIONS ACROSS THE INTERIOR THROUGH
WEDNESDAY DUE TO WARM TEMPERATURES AND LOW HUMIDITY...NEAR
CRITICAL CONDITIONS LATE WEDNESDAY THROUGH FRIDAY DUE TO A CHANCE
FOR THUNDERSTORMS AND POSSIBLE DRY LIGHTNING...THE RELATIVE
HUMIDITY HAS DROPPED ANYWHERE FROM 20-40% FROM THIS TIME YESTERDAY
AS A WARMER, DRIER AIR MASS SETTLES IN. TEMPERATURES ARE CLIMBING
INTO THE 90S ACROSS THE INTERIOR WITH 70S AND 80S ALONG THE
COAST. SIMILAR WARM AND DRY WEATHER WILL CONTINUE THROUGH
WEDNESDAY. STRONG THERMAL BELTING WILL SUPPRESS HUMIDITY
RECOVERIES AT ELEVATIONS ABOVE 1,500 FEET. FORTUNATELY THE WINDS
LOOK TO REMAIN RELATIVELY LIGHT AND MOSTLY ONSHORE DURING THIS
EVENT. FUELS WILL RESPOND TO THE DRIER WEATHER, AND THE REGIONAL
ENERGY RELEASE COMPONENTS ARE MOVING BACK TO NORMAL AS THE WEEK
GOES ON. THE REMNANTS OF TROPICAL STORM MARIO WILL BRING A ROBUST
PUSH OF MOISTURE FROM S-N STARTING LATE WEDNESDAY. THIS MOISTURE
WILL INITIALLY ARRIVE IN THE UPPER ATMOSPHERE. WITH DRY AIR
REMAINING IN THE LOWER LEVELS, THIS SET UP BRINGS A CHANCE FOR
HIGH-BASED, DRY THUNDERSTORMS. THE INITIAL THREAT IS TO THE
CENTRAL COAST WEDNESDAY NIGHT BEFORE SPREADING NORTH THURSDAY AND
FRIDAY. AS THE EVENT UNFOLDS, STORMS SHOULD TRANSITION FROM DRY TO
WET, WITH A BETTER CHANCE OF BENEFICIAL RAIN REACHING THE GROUND
AND HELPING SUPPRESS THE IGNITION THREAT FROM LIGHTNING STRIKES.
IN THE EARLY STAGES (ESPECIALLY WEDNESDAY NIGHT) THE IGNITION
THREAT IS ELEVATED SINCE THE DRY LIGHTNING THREAT SUCCEEDS A
PERIOD OF WARM, DRY WEATHER. THUNDERSTORMS (BOTH DRY AND WET) ALSO
BRING LOCALIZED ERRATIC, GUSTY WINDS THAT CAN CAUSE RAPID SPREAD
OF NEW OR EXISTING FIRES.
ECC018-161000-
MONTEREY ECC DISPATCH-
DISCUSSION FOR MONTEREY AND SAN BENITO COUNTY
254 PM PDT MON SEP 15 2025
...ELEVATED FIRE WEATHER CONDITIONS ACROSS THE INTERIOR THROUGH
WEDNESDAY DUE TO WARM TEMPERATURES AND LOW HUMIDITY...NEAR
CRITICAL CONDITIONS LATE WEDNESDAY THROUGH FRIDAY DUE TO A CHANCE
FOR THUNDERSTORMS AND POSSIBLE DRY LIGHTNING...THE RELATIVE
HUMIDITY HAS DROPPED ANYWHERE FROM 20-40% FROM THIS TIME YESTERDAY
AS A WARMER, DRIER AIR MASS SETTLES IN. TEMPERATURES ARE CLIMBING
INTO THE 90S ACROSS THE INTERIOR WITH 70S AND 80S ALONG THE
COAST. SIMILAR WARM AND DRY WEATHER WILL CONTINUE THROUGH
WEDNESDAY. STRONG THERMAL BELTING WILL SUPPRESS HUMIDITY
RECOVERIES AT ELEVATIONS ABOVE 1,500 FEET. FORTUNATELY THE WINDS
LOOK TO REMAIN RELATIVELY LIGHT AND MOSTLY ONSHORE DURING THIS
EVENT. FUELS WILL RESPOND TO THE DRIER WEATHER, AND THE REGIONAL
ENERGY RELEASE COMPONENTS ARE MOVING BACK TO NORMAL AS THE WEEK
GOES ON. THE REMNANTS OF TROPICAL STORM MARIO WILL BRING A ROBUST
PUSH OF MOISTURE FROM S-N STARTING LATE WEDNESDAY. THIS MOISTURE
WILL INITIALLY ARRIVE IN THE UPPER ATMOSPHERE. WITH DRY AIR
REMAINING IN THE LOWER LEVELS, THIS SET UP BRINGS A CHANCE FOR
HIGH-BASED, DRY THUNDERSTORMS. THE INITIAL THREAT IS TO THE
CENTRAL COAST WEDNESDAY NIGHT BEFORE SPREADING NORTH THURSDAY AND
FRIDAY. AS THE EVENT UNFOLDS, STORMS SHOULD TRANSITION FROM DRY TO
WET, WITH A BETTER CHANCE OF BENEFICIAL RAIN REACHING THE GROUND
AND HELPING SUPPRESS THE IGNITION THREAT FROM LIGHTNING STRIKES.
IN THE EARLY STAGES (ESPECIALLY WEDNESDAY NIGHT) THE IGNITION
THREAT IS ELEVATED SINCE THE DRY LIGHTNING THREAT SUCCEEDS A
PERIOD OF WARM, DRY WEATHER. THUNDERSTORMS (BOTH DRY AND WET) ALSO
BRING LOCALIZED ERRATIC, GUSTY WINDS THAT CAN CAUSE RAPID SPREAD
OF NEW OR EXISTING FIRES.
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