Routine Fire Wx Fcst (With/Without 6-10 Day Outlook)
Issued by NWS Eureka, CA
Issued by NWS Eureka, CA
887
FNUS56 KEKA 200712
FWFEKA
FIRE WEATHER PLANNING FORECAST FOR NORTHWEST CALIFORNIA
NATIONAL WEATHER SERVICE Eureka CA
1212 AM PDT Wed Aug 20 2025
...BUILDING HOT AND VERY DRY CONDITIONS WILL INCREASE FIRE DANGER
ACROSS THE INTERIOR THROUGH THE WEEK...
.DISCUSSION...Hot and very dry weather will begin to quickly build
across the interior today. By Thursday, highs will generally
reach above 100 in the hottest valleys with RH in the low teens or
even single digits. Overnight recoveries will become increasingly
poor at mid and upper elevations. Marine influence will become
increasingly shallow and restricted to the coast. Similar hot and
dry conditions will continue through the weekend. There is a very
slight chance of dry thunderstorms over high interior terrain by
Sunday afternoon into early next week.
CAZ201-210115-
North Coast-
1212 AM PDT Wed Aug 20 2025
.TODAY...
* Sky/Weather............Partly cloudy then becoming sunny. Patchy
dense fog late in the morning.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...74-82
Ridges/upr slopes....69-77
* Min Humidity.......
Valleys/lwr slopes...69-79 percent
Ridges/upr slopes....62-72 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northwest winds 5 to 9 mph.
Ridges/upr slopes....Northwest winds 5 to 11 mph.
* Mixing Height..........2400 ft AGL.
* Chc of Wetting Rain....0 percent.
.TONIGHT...
* Sky/Weather............Mostly clear. Patchy dense fog in the late
evening and overnight.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...53-58
Ridges/upr slopes....53-61
* Max Humidity.......
Valleys/lwr slopes...76-91 percent
Ridges/upr slopes....63-78 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.
.THURSDAY...
* Sky/Weather............Sunny. Patchy dense fog early in the
morning.
* Max Temperature.......
Valleys/lwr slopes...75-83
Ridges/upr slopes....70-78
* Min Humidity.......
Valleys/lwr slopes...67-77 percent
Ridges/upr slopes....59-69 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northwest winds 5 to 11 mph.
Ridges/upr slopes....Northwest winds 5 to 11 mph.
* Mixing Height..........2300 ft AGL.
* Chc of Wetting Rain....0 percent.
.THURSDAY NIGHT...
* Sky/Weather............Mostly clear.
* Min Temperature.......
Valleys/lwr slopes...53-58
Ridges/upr slopes....53-60
* Max Humidity.......
Valleys/lwr slopes...77-92 percent
Ridges/upr slopes....63-78 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 9 mph...shifting to
the northeast 5 to 6 mph after midnight.
* Mixing Height..........0 ft AGL.
* Chc of Wetting Rain....0 percent.
$$
CAZ202-210115-
Coastal Mendocino-
1212 AM PDT Wed Aug 20 2025
.TODAY...
* Sky/Weather............Partly cloudy then becoming sunny. Patchy
fog early in the morning.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...70-78
Ridges/upr slopes....75-83
* Min Humidity.......
Valleys/lwr slopes...65-75 percent
Ridges/upr slopes....49-59 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northwest winds 5 to 11 mph.
Ridges/upr slopes....Northwest winds 5 to 11 mph.
* Mixing Height..........1400 ft AGL.
* Chc of Wetting Rain....0 percent.
.TONIGHT...
* Sky/Weather............Mostly clear. Patchy fog early in the
morning.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...52-58
Ridges/upr slopes....52-60
* Max Humidity.......
Valleys/lwr slopes...76-91 percent
Ridges/upr slopes....65-80 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northwest winds 5 to 9 mph.
Ridges/upr slopes....North winds 5 to 9 mph.
* Mixing Height..........100 ft AGL.
* Chc of Wetting Rain....0 percent.
.THURSDAY...
* Sky/Weather............Sunny.
* Max Temperature.......
Valleys/lwr slopes...69-77
Ridges/upr slopes....75-83
* Min Humidity.......
Valleys/lwr slopes...65-75 percent
Ridges/upr slopes....49-59 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northwest winds 5 to 12 mph.
Ridges/upr slopes....Northwest winds 5 to 12 mph.
* Mixing Height..........1500 ft AGL.
* Chc of Wetting Rain....0 percent.
.THURSDAY NIGHT...
* Sky/Weather............Mostly clear. Patchy fog after midnight.
* Min Temperature.......
Valleys/lwr slopes...52-55
Ridges/upr slopes....50-57
* Max Humidity.......
Valleys/lwr slopes...81-96 percent
Ridges/upr slopes....73-88 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northwest winds 5 to 10 mph.
Ridges/upr slopes....Northwest winds 5 to 10 mph.
* Mixing Height..........100 ft AGL.
* Chc of Wetting Rain....0 percent.
$$
CAZ203-204-210115-
Upper Smith-Lower Middle Klamath-
1212 AM PDT Wed Aug 20 2025
.TODAY...
* Sky/Weather............Sunny.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...85-93
Ridges/upr slopes....71-79
* Min Humidity.......
Valleys/lwr slopes...36-44 percent
Ridges/upr slopes....35-45 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northeast winds 5 to 6 mph...shifting to
the west 5 to 7 mph in the afternoon.
Ridges/upr slopes....Northeast winds 5 to 6 mph...shifting to
the northwest 5 to 7 mph in the afternoon.
* Mixing Height..........5900 ft AGL.
* Chc of Wetting Rain....0 percent.
.TONIGHT...
* Sky/Weather............Clear.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...57-61
Ridges/upr slopes....59-63
* Max Humidity.......
Valleys/lwr slopes...55-70 percent
Ridges/upr slopes....44-54 percent
* 20-Foot Winds...
Valleys/lwr slopes...Southwest winds 5 to 8 mph...shifting to
the northeast after midnight.
Ridges/upr slopes....Northeast winds 5 to 9 mph.
* Mixing Height..........0 ft AGL.
* Chc of Wetting Rain....0 percent.
.THURSDAY...
* Sky/Weather............Sunny.
* Max Temperature.......
Valleys/lwr slopes...91-99
Ridges/upr slopes....77-85
* Min Humidity.......
Valleys/lwr slopes...30-38 percent
Ridges/upr slopes....29-37 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northeast winds 5 to 7 mph...shifting to
the west 5 to 8 mph in the afternoon.
Ridges/upr slopes....Northeast winds 5 to 9 mph...shifting to
the northwest 5 to 6 mph in the afternoon.
* Mixing Height..........6500 ft AGL.
* Chc of Wetting Rain....0 percent.
.THURSDAY NIGHT...
* Sky/Weather............Clear.
* Min Temperature.......
Valleys/lwr slopes...59-64
Ridges/upr slopes....62-65
* Max Humidity.......
Valleys/lwr slopes...50-60 percent
Ridges/upr slopes....37-47 percent
* 20-Foot Winds...
Valleys/lwr slopes...West winds 5 to 7 mph...shifting to the
northeast 5 to 6 mph after midnight.
Ridges/upr slopes....North winds 5 to 6 mph...shifting to the
northeast 5 to 7 mph after midnight.
* Mixing Height..........0 ft AGL.
* Chc of Wetting Rain....0 percent.
$$
CAZ211-212-210115-
Hoopa-Van Duzen/Mad River-
1212 AM PDT Wed Aug 20 2025
.TODAY...
* Sky/Weather............Sunny.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...85-93
Ridges/upr slopes....75-83
* Min Humidity.......
Valleys/lwr slopes...31-39 percent
Ridges/upr slopes....36-44 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northwest winds 5 to 9 mph.
Ridges/upr slopes....Northwest winds 5 to 9 mph.
* Mixing Height..........4800 ft AGL.
* Chc of Wetting Rain....0 percent.
.TONIGHT...
* Sky/Weather............Clear.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...56-60
Ridges/upr slopes....54-62
* Max Humidity.......
Valleys/lwr slopes...63-78 percent
Ridges/upr slopes....54-64 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northwest winds 5 to 9 mph in the
evening...becoming downslope/downvalley 2
to 5 mph.
Ridges/upr slopes....North winds 5 to 8 mph.
* Mixing Height..........0 ft AGL.
* Chc of Wetting Rain....0 percent.
.THURSDAY...
* Sky/Weather............Sunny.
* Max Temperature.......
Valleys/lwr slopes...89-97
Ridges/upr slopes....81-89
* Min Humidity.......
Valleys/lwr slopes...28-36 percent
Ridges/upr slopes....31-39 percent
* 20-Foot Winds...
Valleys/lwr slopes...Upslope/upvalley 2 to 5 mph...becoming
northwest 5 to 11 mph in the afternoon.
Ridges/upr slopes....North winds 5 to 6 mph...shifting to the
northwest 5 to 8 mph in the afternoon.
* Mixing Height..........5900 ft AGL.
* Chc of Wetting Rain....0 percent.
.THURSDAY NIGHT...
* Sky/Weather............Clear.
* Min Temperature.......
Valleys/lwr slopes...57-63
Ridges/upr slopes....57-65
* Max Humidity.......
Valleys/lwr slopes...57-72 percent
Ridges/upr slopes....47-57 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northwest winds 5 to 11 mph in the
evening...becoming downslope/downvalley 2
to 5 mph.
Ridges/upr slopes....Northwest winds 5 to 8 mph...shifting to
the east 5 to 6 mph after midnight.
* Mixing Height..........0 ft AGL.
* Chc of Wetting Rain....0 percent.
$$
CAZ283-210115-
Trinity-
1212 AM PDT Wed Aug 20 2025
.TODAY...
* Sky/Weather............Sunny.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...90-96
Ridges/upr slopes....75-83
* Min Humidity.......
Valleys/lwr slopes...16-21 percent
Ridges/upr slopes....22-30 percent
* 20-Foot Winds...
Valleys/lwr slopes...Upslope/upvalley 2 to 5 mph...becoming
west 5 to 9 mph in the afternoon.
Ridges/upr slopes....Northwest winds 5 to 8 mph.
* Mixing Height..........8300 ft AGL.
* Chc of Wetting Rain....0 percent.
.TONIGHT...
* Sky/Weather............Clear.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...57-62
Ridges/upr slopes....55-63
* Max Humidity.......
Valleys/lwr slopes...51-61 percent
Ridges/upr slopes....42-52 percent
* 20-Foot Winds...
Valleys/lwr slopes...Southwest winds 5 to 9 mph.
Ridges/upr slopes....Northwest winds 5 to 8 mph...shifting to
the north 5 to 7 mph after midnight.
* Mixing Height..........0 ft AGL.
* Chc of Wetting Rain....0 percent.
.THURSDAY...
* Sky/Weather............Sunny.
* Max Temperature.......
Valleys/lwr slopes...97-103
Ridges/upr slopes....82-90
* Min Humidity.......
Valleys/lwr slopes...10-13 percent
Ridges/upr slopes....13-21 percent
* 20-Foot Winds...
Valleys/lwr slopes...Upslope/upvalley 1 to 3 mph.
Ridges/upr slopes....Southwest winds 5 to 6 mph.
* Mixing Height..........9400 ft AGL.
* Chc of Wetting Rain....0 percent.
.THURSDAY NIGHT...
* Sky/Weather............Clear.
* Min Temperature.......
Valleys/lwr slopes...60-65
Ridges/upr slopes....58-66
* Max Humidity.......
Valleys/lwr slopes...39-49 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 6 mph...shifting to
the northeast 5 mph after midnight.
* Mixing Height..........0 ft AGL.
* Chc of Wetting Rain....0 percent.
$$
CAZ276-210115-
Interior Mendocino-
1212 AM PDT Wed Aug 20 2025
.TODAY...
* Sky/Weather............Sunny.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...85-93
Ridges/upr slopes....80-88
* Min Humidity.......
Valleys/lwr slopes...33-41 percent
Ridges/upr slopes....35-43 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northwest winds 5 to 10 mph.
Ridges/upr slopes....Northwest winds 5 to 10 mph.
* Mixing Height..........4300 ft AGL.
* Chc of Wetting Rain....0 percent.
.TONIGHT...
* Sky/Weather............Clear.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...55-63
Ridges/upr slopes....56-64
* Max Humidity.......
Valleys/lwr slopes...56-71 percent
Ridges/upr slopes....55-70 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northwest winds 5 to 10 mph.
Ridges/upr slopes....Northwest winds 5 to 10 mph.
* Mixing Height..........0 ft AGL.
* Chc of Wetting Rain....0 percent.
.THURSDAY...
* Sky/Weather............Sunny.
* Max Temperature.......
Valleys/lwr slopes...88-96
Ridges/upr slopes....83-91
* Min Humidity.......
Valleys/lwr slopes...32-40 percent
Ridges/upr slopes....35-43 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northwest winds 5 to 12 mph.
Ridges/upr slopes....Northwest winds 5 to 12 mph.
* Mixing Height..........5400 ft AGL.
* Chc of Wetting Rain....0 percent.
.THURSDAY NIGHT...
* Sky/Weather............Mostly clear.
* Min Temperature.......
Valleys/lwr slopes...55-63
Ridges/upr slopes....55-63
* Max Humidity.......
Valleys/lwr slopes...59-74 percent
Ridges/upr slopes....58-73 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northwest winds 5 to 11 mph.
Ridges/upr slopes....North winds 5 to 11 mph.
* Mixing Height..........0 ft AGL.
* Chc of Wetting Rain....0 percent.
$$
CAZ277-210115-
W Mendocino NF/E Mendocino Unit-
1212 AM PDT Wed Aug 20 2025
.TODAY...
* Sky/Weather............Sunny.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...89-97
Ridges/upr slopes....79-87
* Min Humidity.......
Valleys/lwr slopes...19-24 percent
Ridges/upr slopes....19-26 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northwest winds 5 to 8 mph.
Ridges/upr slopes....Northwest winds 5 to 9 mph.
* Mixing Height..........7400 ft AGL.
* Chc of Wetting Rain....0 percent.
.TONIGHT...
* Sky/Weather............Clear.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...55-63
Ridges/upr slopes....61-69
* Max Humidity.......
Valleys/lwr slopes...52-62 percent
Ridges/upr slopes....36-46 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northwest winds 5 to 8 mph...shifting to
the north 5 to 6 mph after midnight.
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.
.THURSDAY...
* Sky/Weather............Sunny.
* Max Temperature.......
Valleys/lwr slopes...95-103
Ridges/upr slopes....83-91
* Min Humidity.......
Valleys/lwr slopes...15-21 percent
Ridges/upr slopes....15-21 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northwest winds 5 to 8 mph.
Ridges/upr slopes....West winds 5 to 8 mph.
* Mixing Height..........8100 ft AGL.
* Chc of Wetting Rain....0 percent.
.THURSDAY NIGHT...
* Sky/Weather............Mostly clear.
* Min Temperature.......
Valleys/lwr slopes...58-66
Ridges/upr slopes....63-71
* Max Humidity.......
Valleys/lwr slopes...45-55 percent
Ridges/upr slopes....33-43 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 8 mph...shifting to
the northeast 5 mph after midnight.
* Mixing Height..........0 ft AGL.
* Chc of Wetting Rain....0 percent.
$$
CAZ264-210115-
Lake County Portion of Lake/Napa/Sonoma RU-
1212 AM PDT Wed Aug 20 2025
.TODAY...
* Sky/Weather............Sunny.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...around 90
Ridges/upr slopes....84-88
* Min Humidity.......
Valleys/lwr slopes...19 percent
Ridges/upr slopes....20-27 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northwest winds 5 to 11 mph.
Ridges/upr slopes....Northwest winds 5 to 11 mph.
* Mixing Height..........7600 ft AGL.
* Chc of Wetting Rain....0 percent.
.TONIGHT...
* Sky/Weather............Clear.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...around 61
Ridges/upr slopes....68-72
* Max Humidity.......
Valleys/lwr slopes...44 percent
Ridges/upr slopes....31-41 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northwest winds 5 to 11 mph.
Ridges/upr slopes....Northwest winds 5 to 11 mph.
* Mixing Height..........0 ft AGL.
* Chc of Wetting Rain....0 percent.
.THURSDAY...
* Sky/Weather............Sunny.
* Max Temperature.......
Valleys/lwr slopes...around 94
Ridges/upr slopes....87-92
* Min Humidity.......
Valleys/lwr slopes...15 percent
Ridges/upr slopes....16-22 percent
* 20-Foot Winds...
Valleys/lwr slopes...West winds 5 to 9 mph.
Ridges/upr slopes....West winds 5 to 9 mph.
* Mixing Height..........7700 ft AGL.
* Chc of Wetting Rain....0 percent.
.THURSDAY NIGHT...
* Sky/Weather............Mostly clear.
* Min Temperature.......
Valleys/lwr slopes...around 61
Ridges/upr slopes....68-73
* Max Humidity.......
Valleys/lwr slopes...44 percent
Ridges/upr slopes....31-41 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northwest winds 6 to 10 mph...shifting to
the north 5 to 7 mph after midnight.
Ridges/upr slopes....Northwest winds 5 to 9 mph.
* Mixing Height..........0 ft AGL.
* Chc of Wetting Rain....0 percent.
$$
.EXTENDED FORECAST FOR DAYS 3 THROUGH 5...
...Northwest California Coast...
.FRIDAY...Partly cloudy. Patchy fog in the morning. Lows in the
mid to upper 50s. Highs 66 to 73. Northwest winds 5 mph.
.SATURDAY...Mostly cloudy. Lows in the 50s. Highs 66 to 74.
Northwest winds 5 mph.
.SUNDAY...Mostly cloudy. Patchy fog in the morning. Lows in the
mid to upper 50s. Highs 66 to 73. Northwest winds 5 mph.
...Northwest California Interior...
.FRIDAY...Mostly clear. Lows 63 to 71. Highs 92 to 103. Northwest
winds 5 mph.
.SATURDAY...Mostly clear. Lows 61 to 69. Highs 92 to 103.
Southwest winds 5 mph.
.SUNDAY...Mostly clear. Lows 60 to 68. Highs 89 to 101. West
winds 5 mph.
.6 to 10 DAY OUTLOOK...Monday August 25 THROUGH Friday August 29, 2025...
FOR NW CALIF...ABOVE NORMAL TEMPERATURES AND NEAR NORMAL PRECIPITATION.
$$
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