Routine Fire Wx Fcst (With/Without 6-10 Day Outlook)
Issued by NWS Eureka, CA
Issued by NWS Eureka, CA
815
FNUS56 KEKA 181843
FWFEKA
FIRE WEATHER PLANNING FORECAST FOR NORTHWEST CALIFORNIA
NATIONAL WEATHER SERVICE Eureka CA
1143 AM PDT Mon Aug 18 2025
.DISCUSSION...Conditions will progress towards a warming trend as
high pressure up stream sets into the area. Starting Thursday we
will see RH values in the low to mid teens for zones 283, 277, and
264. Interior afternoon westerly winds will increase this week as
well. Conditions further heat up and dry through late week and the
weekend.
CAZ201-191315-
North Coast-
1143 AM PDT Mon Aug 18 2025
.TONIGHT...
* Sky/Weather............Mostly clear. Patchy dense fog in the
evening. Patchy fog late in the night.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...around 50
Ridges/upr slopes....48-53
* Max Humidity.......
Valleys/lwr slopes...83-98 percent
Ridges/upr slopes....71-86 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....North winds 5 to 7 mph.
* Mixing Height..........0 ft AGL.
* Chc of Wetting Rain....0 percent.
.TUESDAY...
* Sky/Weather............Sunny.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...70-78
Ridges/upr slopes....65-73
* Min Humidity.......
Valleys/lwr slopes...67-77 percent
Ridges/upr slopes....63-73 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northwest winds 5 to 8 mph.
Ridges/upr slopes....Northwest winds 5 to 8 mph.
* Mixing Height..........2700 ft AGL.
* Chc of Wetting Rain....0 percent.
.TUESDAY NIGHT...
* Sky/Weather............Mostly clear.
* Min Temperature.......
Valleys/lwr slopes...49-54
Ridges/upr slopes....50-56
* Max Humidity.......
Valleys/lwr slopes...80-95 percent
Ridges/upr slopes....68-83 percent
* 20-Foot Winds...
Valleys/lwr slopes...North winds 5 to 8 mph.
Ridges/upr slopes....Northwest winds 5 to 8 mph...shifting to
the northeast after midnight.
* Mixing Height..........0 ft AGL.
* Chc of Wetting Rain....0 percent.
.WEDNESDAY...
* Sky/Weather............Sunny.
* Max Temperature.......
Valleys/lwr slopes...73-81
Ridges/upr slopes....68-76
* Min Humidity.......
Valleys/lwr slopes...68-78 percent
Ridges/upr slopes....63-73 percent
* 20-Foot Winds...
Valleys/lwr slopes...North winds 5 mph...shifting to the
northwest 5 to 9 mph in the afternoon.
Ridges/upr slopes....Northeast winds 5 to 7 mph...shifting to
the northwest 5 to 10 mph in the
afternoon.
* Mixing Height..........2600 ft AGL.
* Chc of Wetting Rain....0 percent.
$$
CAZ202-191315-
Coastal Mendocino-
1143 AM PDT Mon Aug 18 2025
.TONIGHT...
* Sky/Weather............Partly cloudy. Patchy fog after midnight.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...49-52
Ridges/upr slopes....46-53
* Max Humidity.......
Valleys/lwr slopes...83-98 percent
Ridges/upr slopes....79-94 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....North winds 5 mph.
* Mixing Height..........100 ft AGL.
* Chc of Wetting Rain....0 percent.
.TUESDAY...
* Sky/Weather............Partly cloudy then becoming sunny. Patchy
fog early in the morning.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...65-73
Ridges/upr slopes....69-77
* Min Humidity.......
Valleys/lwr slopes...64-79 percent
Ridges/upr slopes....56-66 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northwest winds 5 to 8 mph.
Ridges/upr slopes....Variable 2 to 4 mph...becoming northwest 5
to 6 mph in the afternoon.
* Mixing Height..........1700 ft AGL.
* Chc of Wetting Rain....0 percent.
.TUESDAY NIGHT...
* Sky/Weather............Mostly clear then becoming mostly cloudy.
* Min Temperature.......
Valleys/lwr slopes...51-55
Ridges/upr slopes....48-56
* Max Humidity.......
Valleys/lwr slopes...79-94 percent
Ridges/upr slopes....71-86 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 7 mph.
* Mixing Height..........100 ft AGL.
* Chc of Wetting Rain....0 percent.
.WEDNESDAY...
* Sky/Weather............Sunny.
* Max Temperature.......
Valleys/lwr slopes...68-76
Ridges/upr slopes....73-81
* Min Humidity.......
Valleys/lwr slopes...64-74 percent
Ridges/upr slopes....49-59 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northwest winds 5 to 8 mph.
Ridges/upr slopes....Northwest winds 5 to 8 mph.
* Mixing Height..........1600 ft AGL.
* Chc of Wetting Rain....0 percent.
$$
CAZ203-204-191315-
Upper Smith-Lower Middle Klamath-
1143 AM PDT Mon Aug 18 2025
.TONIGHT...
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...48-53
Ridges/upr slopes....51-54
* Max Humidity.......
Valleys/lwr slopes...71-86 percent
Ridges/upr slopes....53-68 percent
* 20-Foot Winds...
Valleys/lwr slopes...Southwest 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
southeast 5 mph after midnight.
* Mixing Height..........0 ft AGL.
* Chc of Wetting Rain....0 percent.
.TUESDAY...
* Sky/Weather............Sunny.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...79-87
Ridges/upr slopes....66-74
* Min Humidity.......
Valleys/lwr slopes...44-54 percent
Ridges/upr slopes....40-50 percent
* 20-Foot Winds...
Valleys/lwr slopes...Upslope/upvalley 2 to 5 mph...becoming
southwest 5 to 8 mph in the afternoon.
Ridges/upr slopes....Southeast winds 5 mph...shifting to the
west 5 to 7 mph in the afternoon.
* Mixing Height..........4300 ft AGL.
* Chc of Wetting Rain....0 percent.
.TUESDAY NIGHT...
* Sky/Weather............Clear.
* Min Temperature.......
Valleys/lwr slopes...52-55
Ridges/upr slopes....54-57
* Max Humidity.......
Valleys/lwr slopes...65-80 percent
Ridges/upr slopes....50-60 percent
* 20-Foot Winds...
Valleys/lwr slopes...West winds 5 to 8 mph in the
evening...becoming downslope/downvalley 2
to 5 mph.
Ridges/upr slopes....West winds 5 to 7 mph...shifting to the
northeast 5 mph after midnight.
* Mixing Height..........0 ft AGL.
* Chc of Wetting Rain....0 percent.
.WEDNESDAY...
* Sky/Weather............Sunny.
* Max Temperature.......
Valleys/lwr slopes...84-92
Ridges/upr slopes....70-78
* Min Humidity.......
Valleys/lwr slopes...37-47 percent
Ridges/upr slopes....37-47 percent
* 20-Foot Winds...
Valleys/lwr slopes...East winds 5 mph...shifting to the
northwest 5 to 6 mph in the afternoon.
Ridges/upr slopes....Northeast winds 5 to 6 mph...shifting to
the northwest in the afternoon.
* Mixing Height..........6300 ft AGL.
* Chc of Wetting Rain....0 percent.
$$
CAZ211-212-191315-
Hoopa-Van Duzen/Mad River-
1143 AM PDT Mon Aug 18 2025
.TONIGHT...
* Sky/Weather............Mostly clear.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...49-53
Ridges/upr slopes....46-54
* Max Humidity.......
Valleys/lwr slopes...79-94 percent
Ridges/upr slopes....66-81 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 to 6 mph...shifting to
the northeast 5 mph after midnight.
* Mixing Height..........0 ft AGL.
* Chc of Wetting Rain....0 percent.
.TUESDAY...
* Sky/Weather............Sunny.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...80-88
Ridges/upr slopes....72-80
* Min Humidity.......
Valleys/lwr slopes...31-41 percent
Ridges/upr slopes....39-49 percent
* 20-Foot Winds...
Valleys/lwr slopes...Upslope/upvalley 2 to 5 mph...becoming
northwest 5 to 8 mph in the afternoon.
Ridges/upr slopes....East winds 5 mph...shifting to the west 5
to 6 mph in the afternoon.
* Mixing Height..........4500 ft AGL.
* Chc of Wetting Rain....0 percent.
.TUESDAY NIGHT...
* Sky/Weather............Clear.
* Min Temperature.......
Valleys/lwr slopes...51-55
Ridges/upr slopes....48-56
* Max Humidity.......
Valleys/lwr slopes...70-85 percent
Ridges/upr slopes....54-69 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northwest winds 5 to 8 mph...shifting to
the north 5 mph after midnight.
Ridges/upr slopes....Northwest winds 5 to 6 mph...shifting to
the north 5 mph after midnight.
* Mixing Height..........0 ft AGL.
* Chc of Wetting Rain....0 percent.
.WEDNESDAY...
* Sky/Weather............Sunny.
* Max Temperature.......
Valleys/lwr slopes...84-92
Ridges/upr slopes....75-83
* Min Humidity.......
Valleys/lwr slopes...30-38 percent
Ridges/upr slopes....36-44 percent
* 20-Foot Winds...
Valleys/lwr slopes...Upslope/upvalley 2 to 5 mph...becoming
northwest 5 to 8 mph in the afternoon.
Ridges/upr slopes....Northeast winds 5 mph...shifting to the
northwest 5 to 7 mph in the afternoon.
* Mixing Height..........5700 ft AGL.
* Chc of Wetting Rain....0 percent.
$$
CAZ283-191315-
Trinity-
1143 AM PDT Mon Aug 18 2025
.TONIGHT...
* Sky/Weather............Mostly clear.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...51-56
Ridges/upr slopes....48-55
* Max Humidity.......
Valleys/lwr slopes...57-72 percent
Ridges/upr slopes....52-62 percent
* 20-Foot Winds...
Valleys/lwr slopes...Downslope/downvalley 1 to 3 mph.
Ridges/upr slopes....Southwest winds 5 to 6 mph...shifting to
the southeast 5 mph after midnight.
* Mixing Height..........0 ft AGL.
* Chc of Wetting Rain....0 percent.
.TUESDAY...
* Sky/Weather............Sunny.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...86-92
Ridges/upr slopes....71-79
* Min Humidity.......
Valleys/lwr slopes...17-22 percent
Ridges/upr slopes....24-32 percent
* 20-Foot Winds...
Valleys/lwr slopes...Upslope/upvalley 2 to 4 mph...becoming
southeast 5 mph in the afternoon.
Ridges/upr slopes....South winds 5 to 7 mph.
* Mixing Height..........7600 ft AGL.
* Chc of Wetting Rain....0 percent.
.TUESDAY NIGHT...
* Sky/Weather............Clear.
* Min Temperature.......
Valleys/lwr slopes...53-58
Ridges/upr slopes....51-58
* Max Humidity.......
Valleys/lwr slopes...56-69 percent
Ridges/upr slopes....46-56 percent
* 20-Foot Winds...
Valleys/lwr slopes...West winds 5 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.
.WEDNESDAY...
* Sky/Weather............Sunny.
* Max Temperature.......
Valleys/lwr slopes...89-95
Ridges/upr slopes....74-82
* Min Humidity.......
Valleys/lwr slopes...17-22 percent
Ridges/upr slopes....24-32 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....North winds 5 mph...shifting to the
northwest 5 to 6 mph in the afternoon.
* Mixing Height..........8800 ft AGL.
* Chc of Wetting Rain....0 percent.
$$
CAZ276-191315-
Interior Mendocino-
1143 AM PDT Mon Aug 18 2025
.TONIGHT...
* Sky/Weather............Clear.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...47-55
Ridges/upr slopes....48-56
* Max Humidity.......
Valleys/lwr slopes...74-89 percent
Ridges/upr slopes....69-84 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northwest winds 5 to 8 mph.
Ridges/upr slopes....Northwest winds 5 to 8 mph.
* Mixing Height..........0 ft AGL.
* Chc of Wetting Rain....0 percent.
.TUESDAY...
* Sky/Weather............Sunny.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...79-87
Ridges/upr slopes....75-83
* Min Humidity.......
Valleys/lwr slopes...37-47 percent
Ridges/upr slopes....40-50 percent
* 20-Foot Winds...
Valleys/lwr slopes...Upslope/upvalley 2 to 5 mph...becoming
west 5 to 8 mph in the afternoon.
Ridges/upr slopes....Northwest winds 5 to 8 mph.
* Mixing Height..........4000 ft AGL.
* Chc of Wetting Rain....0 percent.
.TUESDAY NIGHT...
* Sky/Weather............Clear.
* Min Temperature.......
Valleys/lwr slopes...51-59
Ridges/upr slopes....51-59
* Max Humidity.......
Valleys/lwr slopes...66-81 percent
Ridges/upr slopes....63-78 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northwest winds 5 to 8 mph.
Ridges/upr slopes....Northwest winds 5 to 8 mph.
* Mixing Height..........0 ft AGL.
* Chc of Wetting Rain....0 percent.
.WEDNESDAY...
* Sky/Weather............Sunny.
* Max Temperature.......
Valleys/lwr slopes...83-91
Ridges/upr slopes....79-87
* Min Humidity.......
Valleys/lwr slopes...35-43 percent
Ridges/upr slopes....36-46 percent
* 20-Foot Winds...
Valleys/lwr slopes...Upslope/upvalley 2 to 5 mph...becoming
west 5 to 8 mph in the afternoon.
Ridges/upr slopes....North winds 5 to 6 mph...shifting to the
northwest 5 to 8 mph in the afternoon.
* Mixing Height..........5500 ft AGL.
* Chc of Wetting Rain....0 percent.
$$
CAZ277-191315-
W Mendocino NF/E Mendocino Unit-
1143 AM PDT Mon Aug 18 2025
.TONIGHT...
* Sky/Weather............Clear.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...47-55
Ridges/upr slopes....51-59
* Max Humidity.......
Valleys/lwr slopes...68-83 percent
Ridges/upr slopes....51-61 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 to 6 mph...shifting to
the northeast 5 mph after midnight.
* Mixing Height..........0 ft AGL.
* Chc of Wetting Rain....0 percent.
.TUESDAY...
* Sky/Weather............Sunny.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...83-91
Ridges/upr slopes....73-81
* Min Humidity.......
Valleys/lwr slopes...23-29 percent
Ridges/upr slopes....22-30 percent
* 20-Foot Winds...
Valleys/lwr slopes...Upslope/upvalley 2 to 4 mph...becoming
west 5 to 7 mph in the afternoon.
Ridges/upr slopes....Southeast winds 5 mph...shifting to the
southwest 5 to 8 mph in the afternoon.
* Mixing Height..........6400 ft AGL.
* Chc of Wetting Rain....0 percent.
.TUESDAY NIGHT...
* Sky/Weather............Clear.
* Min Temperature.......
Valleys/lwr slopes...51-59
Ridges/upr slopes....55-63
* Max Humidity.......
Valleys/lwr slopes...60-75 percent
Ridges/upr slopes....45-55 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
north 5 to 6 mph after midnight.
* Mixing Height..........0 ft AGL.
* Chc of Wetting Rain....0 percent.
.WEDNESDAY...
* Sky/Weather............Sunny.
* Max Temperature.......
Valleys/lwr slopes...89-97
Ridges/upr slopes....77-85
* Min Humidity.......
Valleys/lwr slopes...21-27 percent
Ridges/upr slopes....21-28 percent
* 20-Foot Winds...
Valleys/lwr slopes...Upslope/upvalley 2 to 4 mph...becoming
west 5 to 7 mph in the afternoon.
Ridges/upr slopes....Northeast winds 5 mph...shifting to the
west 5 to 8 mph in the afternoon.
* Mixing Height..........8000 ft AGL.
* Chc of Wetting Rain....0 percent.
$$
CAZ264-191315-
Lake County Portion of Lake/Napa/Sonoma RU-
1143 AM PDT Mon Aug 18 2025
.TONIGHT...
* Sky/Weather............Clear.
* Chance Lightning.......0%.
* Min Temperature.......
Valleys/lwr slopes...around 51
Ridges/upr slopes....57-61
* Max Humidity.......
Valleys/lwr slopes...67 percent
Ridges/upr slopes....46-56 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northwest winds 5 to 9 mph.
Ridges/upr slopes....Northwest winds 5 to 9 mph.
* Mixing Height..........0 ft AGL.
* Chc of Wetting Rain....0 percent.
.TUESDAY...
* Sky/Weather............Sunny.
* Chance Lightning.......0%.
* Max Temperature.......
Valleys/lwr slopes...around 84
Ridges/upr slopes....77-82
* Min Humidity.......
Valleys/lwr slopes...22 percent
Ridges/upr slopes....23-31 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northwest winds 5 to 8 mph.
Ridges/upr slopes....West winds 5 to 8 mph.
* Mixing Height..........6300 ft AGL.
* Chc of Wetting Rain....0 percent.
.TUESDAY NIGHT...
* Sky/Weather............Clear.
* Min Temperature.......
Valleys/lwr slopes...around 55
Ridges/upr slopes....61-66
* Max Humidity.......
Valleys/lwr slopes...58 percent
Ridges/upr slopes....40-50 percent
* 20-Foot Winds...
Valleys/lwr slopes...Northwest winds 5 to 8 mph.
Ridges/upr slopes....Northwest winds 5 to 8 mph.
* Mixing Height..........0 ft AGL.
* Chc of Wetting Rain....0 percent.
.WEDNESDAY...
* Sky/Weather............Sunny.
* Max Temperature.......
Valleys/lwr slopes...around 88
Ridges/upr slopes....82-86
* Min Humidity.......
Valleys/lwr slopes...20 percent
Ridges/upr slopes....22-29 percent
* 20-Foot Winds...
Valleys/lwr slopes...North winds 5 to 7 mph...shifting to the
west 5 to 8 mph in the afternoon.
Ridges/upr slopes....North winds 5 to 7 mph...shifting to the
west 5 to 9 mph in the afternoon.
* Mixing Height..........7400 ft AGL.
* Chc of Wetting Rain....0 percent.
$$
.EXTENDED FORECAST FOR DAYS 3 THROUGH 5...
...Northwest California Coast...
.THURSDAY...Partly cloudy. Lows in the lower to mid 50s. Highs
66 to 74. North winds 5 mph.
.FRIDAY...Partly cloudy. Lows in the lower to mid 50s. Highs
65 to 73. North winds 5 mph.
.SATURDAY...Partly cloudy. Lows in the lower to mid 50s. Highs
65 to 73. North winds 5 mph.
...Northwest California Interior...
.THURSDAY...Clear. Lows 57 to 65. Highs 89 to 101. Northwest
winds 5 mph.
.FRIDAY...Mostly clear. Lows 60 to 68. Highs 91 to 103. Northwest
winds 5 mph.
.SATURDAY...Mostly clear. Lows 61 to 69. Highs 91 to 103.
Northwest winds 5 mph.
.6 to 10 DAY OUTLOOK...Sunday August 24 THROUGH Thursday August 28, 2025...
FOR NW CALIF...ABOVE NORMAL TEMPERATURES AND ABOVE NORMAL PRECIPITATION.
$$
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