Routine Fire Wx Fcst (With/Without 6-10 Day Outlook)
Issued by NWS Eureka, CA
Issued by NWS Eureka, CA
222
FNUS56 KEKA 211846
FWFEKA
FIRE WEATHER PLANNING FORECAST FOR NORTHWEST CALIFORNIA
NATIONAL WEATHER SERVICE Eureka CA
1146 AM PDT Thu Aug 21 2025
...BUILDING HOT AND VERY DRY CONDITIONS WILL INCREASE FIRE DANGER
ACROSS THE INTERIOR THROUGH THE WEEKEND...
...VERY SLIGHT CHANCES FOR INTERIOR THUNDERSTORMS SATURDAY AND
SUNDAY...
.DISCUSSION...Hot and very dry weather will continue to rapidly
build today. Highs will peak around Friday with the hottest valleys
reaching over 110 with exceptionally dry RH in the single digits.
Overnight recoveries will also become increasingly poor at mid and
upper elevations. Marine influence will shallow and become
restricted to the coast. Similar hot and dry conditions will
continue through the weekend. There is a very slight chance (5-10%)
of dry thunderstorms over high interior terrain by Sunday, but
chances for thunderstorms increase early next week.
CAZ201-221315-
North Coast-
1146 AM PDT Thu Aug 21 2025
.TONIGHT...
* Sky/Weather............Mostly clear.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...52-58
Ridges/upr slopes....53-61
* Max Humidity.......
Valleys/lwr slopes...77-92 percent
Ridges/upr slopes....64-79 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northwest winds 5 to 9 mph.
Ridges/upr slopes....Northwest winds 5 to 10 mph...shifting to
the north 5 to 6 mph after midnight.
* Mixing Height..........0 ft AGL.
* Chc of Wetting Rain....0 percent.
.FRIDAY...
* Sky/Weather............Sunny then becoming partly cloudy.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...77-85
Ridges/upr slopes....74-82
* Min Humidity.......
Valleys/lwr slopes...69-79 percent
Ridges/upr slopes....58-68 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northwest winds 5 to 8 mph.
Ridges/upr slopes....Northwest winds 5 to 9 mph.
* Mixing Height..........1900 ft AGL.
* Chc of Wetting Rain....0 percent.
.FRIDAY NIGHT...
* Sky/Weather............Partly cloudy then becoming mostly cloudy
then becoming partly cloudy. Patchy dense
fog in the late evening and overnight.
* Min Temperature.......
Valleys/lwr slopes...54-61
Ridges/upr slopes....57-65
* Max Humidity.......
Valleys/lwr slopes...73-88 percent
Ridges/upr slopes....60-75 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northwest winds 5 to 7 mph in the
evening...becoming downslope/downvalley 2
to 4 mph.
Ridges/upr slopes....Northwest winds 5 to 9 mph...shifting to
the northeast 5 to 6 mph after midnight.
* Mixing Height..........0 ft AGL.
* Chc of Wetting Rain....0 percent.
.SATURDAY...
* Sky/Weather............Partly cloudy. Patchy dense fog early in
the morning.
* Max Temperature.......
Valleys/lwr slopes...76-84
Ridges/upr slopes....74-82
* Min Humidity.......
Valleys/lwr slopes...69-79 percent
Ridges/upr slopes....56-66 percent
* 20-Foot Winds...
Valleys/lwr slopes...Upslope/upvalley 2 to 4 mph...becoming
west 5 to 6 mph in the afternoon.
Ridges/upr slopes....Northeast winds 5 mph...shifting to the
west in the afternoon.
* Mixing Height..........2300 ft AGL.
* Chc of Wetting Rain....0 percent.
$$
CAZ202-221315-
Coastal Mendocino-
1146 AM PDT Thu Aug 21 2025
.TONIGHT...
* Sky/Weather............Partly cloudy. Patchy fog after midnight.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...52-55
Ridges/upr slopes....50-57
* Max Humidity.......
Valleys/lwr slopes...81-96 percent
Ridges/upr slopes....73-88 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northwest winds 5 to 11 mph.
Ridges/upr slopes....Northwest winds 5 to 11 mph.
* Mixing Height..........100 ft AGL.
* Chc of Wetting Rain....0 percent.
.FRIDAY...
* Sky/Weather............Partly cloudy. Patchy fog in the morning.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...70-78
Ridges/upr slopes....77-85
* Min Humidity.......
Valleys/lwr slopes...68-78 percent
Ridges/upr slopes....48-58 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northwest winds 5 to 8 mph.
Ridges/upr slopes....Northwest winds 5 to 8 mph.
* Mixing Height..........1300 ft AGL.
* Chc of Wetting Rain....0 percent.
.FRIDAY NIGHT...
* Sky/Weather............Partly cloudy then becoming mostly cloudy.
Patchy fog after midnight.
* Min Temperature.......
Valleys/lwr slopes...53-56
Ridges/upr slopes....51-59
* Max Humidity.......
Valleys/lwr slopes...80-95 percent
Ridges/upr slopes....69-84 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northwest winds 5 to 6 mph in the
evening...becoming downslope/downvalley 2
to 4 mph.
Ridges/upr slopes....Northwest winds 5 mph in the
evening...becoming downslope/downvalley 2
to 4 mph.
* Mixing Height..........100 ft AGL.
* Chc of Wetting Rain....0 percent.
.SATURDAY...
* Sky/Weather............Mostly cloudy then becoming partly cloudy
then becoming sunny. Patchy dense fog late
in the afternoon.
* Max Temperature.......
Valleys/lwr slopes...69-77
Ridges/upr slopes....75-83
* Min Humidity.......
Valleys/lwr slopes...65-80 percent
Ridges/upr slopes....48-58 percent
* 20-Foot Winds...
Valleys/lwr slopes...Upslope/upvalley 1 to 3 mph...becoming
west 5 mph in the afternoon.
Ridges/upr slopes....Variable 2 to 4 mph...becoming west 5 mph
in the afternoon.
* Mixing Height..........1400 ft AGL.
* Chc of Wetting Rain....0 percent.
$$
CAZ203-204-221315-
Upper Smith-Lower Middle Klamath-
1146 AM PDT Thu Aug 21 2025
.TONIGHT...
* Sky/Weather............Clear.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...60-65
Ridges/upr slopes....63-68
* Max Humidity.......
Valleys/lwr slopes...50-60 percent
Ridges/upr slopes....35-45 percent
* 20-Foot Winds...
Valleys/lwr slopes...Southwest winds 5 to 8 mph...shifting to
the east 5 to 6 mph after midnight.
Ridges/upr slopes....North winds 5 to 8 mph...shifting to the
northeast 5 to 7 mph after midnight.
* Mixing Height..........0 ft AGL.
* Chc of Wetting Rain....0 percent.
.FRIDAY...
* Sky/Weather............Sunny.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...94-102
Ridges/upr slopes....81-89
* Min Humidity.......
Valleys/lwr slopes...25-33 percent
Ridges/upr slopes....23-31 percent
* 20-Foot Winds...
Valleys/lwr slopes...East winds 5 to 6 mph...shifting to the
west 5 to 8 mph in the afternoon.
Ridges/upr slopes....East winds 5 to 6 mph...shifting to the
west 5 to 7 mph in the afternoon.
* Mixing Height..........6600 ft AGL.
* Chc of Wetting Rain....0 percent.
.FRIDAY NIGHT...
* Sky/Weather............Partly cloudy.
* Min Temperature.......
Valleys/lwr slopes...62-66
Ridges/upr slopes....around 70
* Max Humidity.......
Valleys/lwr slopes...45-55 percent
Ridges/upr slopes....34-44 percent
* 20-Foot Winds...
Valleys/lwr slopes...West winds 5 to 8 mph...shifting to the
east 5 mph after midnight.
Ridges/upr slopes....West winds 5 to 7 mph...shifting to the
northeast 5 to 6 mph after midnight.
* Mixing Height..........0 ft AGL.
* Chc of Wetting Rain....0 percent.
.SATURDAY...
* Sky/Weather............Partly cloudy.
* Max Temperature.......
Valleys/lwr slopes...93-101
Ridges/upr slopes....79-87
* Min Humidity.......
Valleys/lwr slopes...27-35 percent
Ridges/upr slopes....23-31 percent
* 20-Foot Winds...
Valleys/lwr slopes...East winds 5 mph...shifting to the west in
the afternoon.
Ridges/upr slopes....East winds 5 to 6 mph...shifting to the
west 5 mph in the afternoon.
* Mixing Height..........7100 ft AGL.
* Chc of Wetting Rain....0 percent.
$$
CAZ211-212-221315-
Hoopa-Van Duzen/Mad River-
1146 AM PDT Thu Aug 21 2025
.TONIGHT...
* Sky/Weather............Clear.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...57-63
Ridges/upr slopes....57-65
* Max Humidity.......
Valleys/lwr slopes...59-74 percent
Ridges/upr slopes....46-56 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northwest winds 5 to 10 mph in the
evening...becoming downslope/downvalley 2
to 5 mph.
Ridges/upr slopes....Northwest winds 5 to 7 mph...shifting to
the northeast 5 to 6 mph after midnight.
* Mixing Height..........0 ft AGL.
* Chc of Wetting Rain....0 percent.
.FRIDAY...
* Sky/Weather............Sunny then becoming partly cloudy.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...95-103
Ridges/upr slopes....86-94
* Min Humidity.......
Valleys/lwr slopes...21-29 percent
Ridges/upr slopes....18-26 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northeast winds 5 mph...shifting to the
west 5 to 8 mph in the afternoon.
Ridges/upr slopes....East winds 5 to 6 mph...shifting to the
southwest in the afternoon.
* Mixing Height..........5700 ft AGL.
* Chc of Wetting Rain....0 percent.
.FRIDAY NIGHT...
* Sky/Weather............Partly cloudy then becoming mostly cloudy
then becoming partly cloudy.
* Min Temperature.......
Valleys/lwr slopes...61-67
Ridges/upr slopes....61-69
* Max Humidity.......
Valleys/lwr slopes...49-59 percent
Ridges/upr slopes....36-46 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northwest winds 5 to 7 mph...shifting to
the northeast 5 mph after midnight.
Ridges/upr slopes....West winds 5 to 6 mph...shifting to the
northeast after midnight.
* Mixing Height..........0 ft AGL.
* Chc of Wetting Rain....0 percent.
.SATURDAY...
* Sky/Weather............Partly cloudy.
* Max Temperature.......
Valleys/lwr slopes...94-102
Ridges/upr slopes....84-92
* Min Humidity.......
Valleys/lwr slopes...20-28 percent
Ridges/upr slopes....16-24 percent
* 20-Foot Winds...
Valleys/lwr slopes...East winds 5 mph...shifting to the
southwest 5 to 6 mph in the afternoon.
Ridges/upr slopes....East winds 5 to 6 mph...shifting to the
southwest in the afternoon.
* Mixing Height..........6600 ft AGL.
* Chc of Wetting Rain....0 percent.
$$
CAZ283-221315-
Trinity-
1146 AM PDT Thu Aug 21 2025
.TONIGHT...
* Sky/Weather............Clear.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...60-65
Ridges/upr slopes....59-67
* Max Humidity.......
Valleys/lwr slopes...41-51 percent
Ridges/upr slopes....32-42 percent
* 20-Foot Winds...
Valleys/lwr slopes...West winds 5 to 7 mph in the
evening...becoming downslope/downvalley 2
to 4 mph.
Ridges/upr slopes....Northwest winds 5 to 7 mph...shifting to
the northeast 5 to 6 mph after midnight.
* Mixing Height..........0 ft AGL.
* Chc of Wetting Rain....0 percent.
.FRIDAY...
* Sky/Weather............Sunny then becoming partly cloudy.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...97-103
Ridges/upr slopes....83-91
* Min Humidity.......
Valleys/lwr slopes...8-11 percent
Ridges/upr slopes....11-16 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northeast winds 5 mph...shifting to the
southeast 5 to 6 mph in the afternoon.
Ridges/upr slopes....East winds 5 to 6 mph...shifting to the
south 5 to 8 mph in the afternoon.
* Mixing Height..........8500 ft AGL.
* Chc of Wetting Rain....0 percent.
.FRIDAY NIGHT...
* Sky/Weather............Partly cloudy.
* Min Temperature.......
Valleys/lwr slopes...64-69
Ridges/upr slopes....61-69
* Max Humidity.......
Valleys/lwr slopes...33-43 percent
Ridges/upr slopes....24-32 percent
* 20-Foot Winds...
Valleys/lwr slopes...South winds 5 to 6 mph in the
evening...becoming downslope/downvalley 2
to 4 mph.
Ridges/upr slopes....Southwest winds 5 to 6 mph...shifting to
the northeast after midnight.
* Mixing Height..........0 ft AGL.
* Chc of Wetting Rain....0 percent.
.SATURDAY...
* Sky/Weather............Partly cloudy.
* Max Temperature.......
Valleys/lwr slopes...98-103
Ridges/upr slopes....83-91
* Min Humidity.......
Valleys/lwr slopes...9-13 percent
Ridges/upr slopes....13-18 percent
* 20-Foot Winds...
Valleys/lwr slopes...Upslope/upvalley 2 to 4 mph...becoming
southeast 5 mph in the afternoon.
Ridges/upr slopes....East winds 5 to 6 mph...shifting to the
south 5 to 7 mph in the afternoon.
* Mixing Height..........9500 ft AGL.
* Chc of Wetting Rain....0 percent.
$$
CAZ276-221315-
Interior Mendocino-
1146 AM PDT Thu Aug 21 2025
.TONIGHT...
* Sky/Weather............Mostly clear.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...55-63
Ridges/upr slopes....56-64
* Max Humidity.......
Valleys/lwr slopes...60-75 percent
Ridges/upr slopes....56-71 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northwest winds 5 to 11 mph.
Ridges/upr slopes....Northwest winds 5 to 11 mph.
* Mixing Height..........0 ft AGL.
* Chc of Wetting Rain....0 percent.
.FRIDAY...
* Sky/Weather............Sunny then becoming partly cloudy.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...91-99
Ridges/upr slopes....85-93
* Min Humidity.......
Valleys/lwr slopes...28-36 percent
Ridges/upr slopes....35-43 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northeast winds 5 to 6 mph...shifting to
the southwest 5 to 8 mph in the afternoon.
Ridges/upr slopes....Northeast winds 5 to 6 mph...shifting to
the southwest 5 to 7 mph in the afternoon.
* Mixing Height..........4700 ft AGL.
* Chc of Wetting Rain....0 percent.
.FRIDAY NIGHT...
* Sky/Weather............Partly cloudy.
* Min Temperature.......
Valleys/lwr slopes...59-67
Ridges/upr slopes....59-67
* Max Humidity.......
Valleys/lwr slopes...53-63 percent
Ridges/upr slopes....52-62 percent
* 20-Foot Winds...
Valleys/lwr slopes...West winds 5 to 7 mph in the
evening...becoming downslope/downvalley 2
to 4 mph.
Ridges/upr slopes....West winds 5 to 6 mph...shifting to the
north 5 mph after midnight.
* Mixing Height..........0 ft AGL.
* Chc of Wetting Rain....0 percent.
.SATURDAY...
* Sky/Weather............Partly cloudy then becoming sunny.
* Max Temperature.......
Valleys/lwr slopes...89-97
Ridges/upr slopes....83-91
* Min Humidity.......
Valleys/lwr slopes...28-36 percent
Ridges/upr slopes....34-42 percent
* 20-Foot Winds...
Valleys/lwr slopes...Upslope/upvalley 2 to 4 mph...becoming
southwest 5 to 6 mph in the afternoon.
Ridges/upr slopes....Northeast winds 5 mph...shifting to the
southwest 5 to 6 mph in the afternoon.
* Mixing Height..........4900 ft AGL.
* Chc of Wetting Rain....0 percent.
$$
CAZ277-221315-
W Mendocino NF/E Mendocino Unit-
1146 AM PDT Thu Aug 21 2025
.TONIGHT...
* Sky/Weather............Mostly clear.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...58-66
Ridges/upr slopes....63-70
* Max Humidity.......
Valleys/lwr slopes...46-56 percent
Ridges/upr slopes....32-42 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northwest winds 5 to 10 mph...shifting to
the northeast after midnight.
Ridges/upr slopes....Northwest winds 5 to 7 mph...shifting to
the east after midnight.
* Mixing Height..........0 ft AGL.
* Chc of Wetting Rain....0 percent.
.FRIDAY...
* Sky/Weather............Sunny then becoming partly cloudy.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...97-104
Ridges/upr slopes....85-93
* Min Humidity.......
Valleys/lwr slopes...11-16 percent
Ridges/upr slopes....12-17 percent
* 20-Foot Winds...
Valleys/lwr slopes...East winds 5 to 6 mph...shifting to the
southwest 5 to 7 mph in the afternoon.
Ridges/upr slopes....East winds 5 to 7 mph...shifting to the
south 5 to 8 mph in the afternoon.
* Mixing Height..........7500 ft AGL.
* Chc of Wetting Rain....0 percent.
.FRIDAY NIGHT...
* Sky/Weather............Partly cloudy.
* Min Temperature.......
Valleys/lwr slopes...61-69
Ridges/upr slopes....66-74
* Max Humidity.......
Valleys/lwr slopes...37-47 percent
Ridges/upr slopes....26-34 percent
* 20-Foot Winds...
Valleys/lwr slopes...West winds 5 to 7 mph in the
evening...becoming downslope/downvalley 2
to 4 mph.
Ridges/upr slopes....West winds 5 to 8 mph...shifting to the
northeast 5 mph after midnight.
* Mixing Height..........0 ft AGL.
* Chc of Wetting Rain....0 percent.
.SATURDAY...
* Sky/Weather............Partly cloudy then becoming sunny.
* Max Temperature.......
Valleys/lwr slopes...96-104
Ridges/upr slopes....85-93
* Min Humidity.......
Valleys/lwr slopes...13-18 percent
Ridges/upr slopes....14-19 percent
* 20-Foot Winds...
Valleys/lwr slopes...Upslope/upvalley 2 to 4 mph...becoming
southwest 5 to 6 mph in the afternoon.
Ridges/upr slopes....Northeast winds 5 mph...shifting to the
south 5 to 7 mph in the afternoon.
* Mixing Height..........8600 ft AGL.
* Chc of Wetting Rain....0 percent.
$$
CAZ264-221315-
Lake County Portion of Lake/Napa/Sonoma RU-
1146 AM PDT Thu Aug 21 2025
.TONIGHT...
* Sky/Weather............Mostly clear.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...around 61
Ridges/upr slopes....70-73
* Max Humidity.......
Valleys/lwr slopes...43 percent
Ridges/upr slopes....31-39 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northwest winds 5 to 9 mph.
Ridges/upr slopes....Northwest winds 5 to 9 mph.
* Mixing Height..........0 ft AGL.
* Chc of Wetting Rain....0 percent.
.FRIDAY...
* Sky/Weather............Sunny.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...around 97
Ridges/upr slopes....89-94
* Min Humidity.......
Valleys/lwr slopes...7 percent
Ridges/upr slopes....12-15 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northeast winds 5 to 7 mph...shifting to
the south 6 to 9 mph in the afternoon.
Ridges/upr slopes....Northeast winds 5 to 7 mph...shifting to
the south 5 to 8 mph in the afternoon.
* Mixing Height..........6900 ft AGL.
* Chc of Wetting Rain....0 percent.
.FRIDAY NIGHT...
* Sky/Weather............Partly cloudy.
* Min Temperature.......
Valleys/lwr slopes...around 66
Ridges/upr slopes....74-77
* Max Humidity.......
Valleys/lwr slopes...33 percent
Ridges/upr slopes....26-34 percent
* 20-Foot Winds...
Valleys/lwr slopes...West winds 6 to 9 mph...shifting to the
north 5 mph after midnight.
Ridges/upr slopes....West winds 5 to 8 mph...shifting to the
north 5 to 6 mph after midnight.
* Mixing Height..........0 ft AGL.
* Chc of Wetting Rain....0 percent.
.SATURDAY...
* Sky/Weather............Partly cloudy then becoming sunny.
* Max Temperature.......
Valleys/lwr slopes...around 96
Ridges/upr slopes....89-93
* Min Humidity.......
Valleys/lwr slopes...10 percent
Ridges/upr slopes....12-16 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northeast winds 5 mph...shifting to the
south 5 to 7 mph in the afternoon.
Ridges/upr slopes....Northeast winds 5 to 6 mph...shifting to
the south 5 to 8 mph in the afternoon.
* Mixing Height..........7600 ft AGL.
* Chc of Wetting Rain....0 percent.
$$
.EXTENDED FORECAST FOR DAYS 3 THROUGH 5...
...Northwest California Coast...
.SUNDAY...Mostly cloudy. Patchy fog. Lows in the mid to upper
50s. Highs 65 to 72. Winds generally less than 5 mph.
.MONDAY...Mostly cloudy. Patchy fog. Lows in the mid to upper
50s. Highs 66 to 73. Northwest winds 5 mph.
.TUESDAY...Mostly cloudy. Patchy fog. Lows in the mid to upper
50s. Highs 66 to 73. Winds generally less than 5 mph.
...Northwest California Interior...
.SUNDAY...Mostly clear. Lows 61 to 69. Highs 89 to 101. West
winds 5 mph.
.MONDAY...Mostly clear. Lows 60 to 68. Highs 89 to 101. Northwest
winds 5 mph.
.TUESDAY...Mostly clear. Lows 60 to 68. Highs 88 to 100. West
winds 5 mph.
.6 to 10 DAY OUTLOOK...Wednesday August 27 THROUGH Sunday August 31, 2025...
FOR NW CALIF...ABOVE NORMAL TEMPERATURES AND ABOVE NORMAL PRECIPITATION.
$$
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