161
FNUS56 KSTO 200730
FWFSTO

Fire Weather Planning Forecast for Interior Northern California
National Weather Service Sacramento CA
1230 AM PDT Wed Aug 20 2025

NOTE: THIS PRODUCT HAS UPDATED FORECAST DATA BUT THE FORECAST
DISCUSSION IS FROM THE PREVIOUS DAY.


...Hot and Dry Conditions Will Lead to Elevated Fire Weather
Concerns on Thursday and Friday...

.DISCUSSION...
Dry and breezy conditions continue through Wednesday with near
normal temperatures. Well above normal temperatures Thursday into
the weekend with low daytime humidity and poor to moderate
overnight recovery. These conditions will lead to elevated fire
weather concerns in the northern Sacramento Valley and adjacent
terrain. Isolated mountain thunderstorm chances increase this
weekend and early next week over the Sierra and southern Cascades.



CAZ213-210000-
Eastern Portion of Shasta-Trinity NF-
1230 AM PDT Wed Aug 20 2025

.TODAY...
* Sky/Weather............Sunny.
* Max Temperature........95-100 lower elevations...except 85-94
  higher elevations.
*   24 HR Trend..........6 degrees warmer.
* Min Humidity...........16-21 percent.
*   24 HR Trend..........Little change.
* 20-Foot Winds..........
*   Valleys/Lwr Slopes...North winds up to 7 mph in the morning
    becoming upslope up to 5 mph.
*   Ridges/Upr Slopes....Northeast winds up to 8 mph in the morning
    becoming variable up to 5 mph.
* CWR....................0 percent.
* Mixing Height..........8800 ft AGL.
* Chance of thunder......1 percent.

.TONIGHT...
* Sky/Weather............Clear.
* Min Temperature........66-71 lower elevations...except 55-65
  higher elevations.
*   24 HR Trend..........5 degrees warmer.
* Max Humidity...........42-57 percent.
*   24 HR Trend..........7 percent down.
* 20-Foot Winds..........
*   Valleys/Lwr Slopes...North winds 5 to 11 mph.
*   Ridges/Upr Slopes....North winds 5 to 11 mph.
* CWR....................0 percent.
* Mixing Height..........700 ft AGL.
* Chance of thunder......1 percent.

.THURSDAY...
* Sky/Weather............Sunny.
* Max Temperature........101-106 lower elevations...except 90-100
  higher elevations.
* Min Humidity...........8-17 percent.
* 20-Foot Winds..........
*   Valleys/Lwr Slopes...North winds 4 to 9 mph with local gusts up
    to 20 mph in the morning becoming upslope up to 5 mph.
*   Ridges/Upr Slopes....Northeast winds 7 to 13 mph shifting to the
    southeast up to 8 mph in the afternoon.
* Mixing Height..........8400 ft AGL.
* CWR....................0 percent.
* Chance of thunder......0 percent.


$$

CAZ214-210000-
Burney Basin and Northeast Plateau in Shasta County Including
Northwest Lassen NF north of Lassen NP-
1230 AM PDT Wed Aug 20 2025

.TODAY...
* Sky/Weather............Sunny.
* Max Temperature........88-93 lower elevations...except 82-87
  higher elevations.
*   24 HR Trend..........5 degrees warmer.
* Min Humidity...........14-19 percent.
*   24 HR Trend..........Little change.
* 20-Foot Winds..........
*   Valleys/Lwr Slopes...Upslope winds up to 5 mph.
*   Ridges/Upr Slopes....Variable winds up to 7 mph.
* CWR....................0 percent.
* Mixing Height..........8300 ft AGL.
* Chance of thunder......0 percent.

.TONIGHT...
* Sky/Weather............Clear.
* Min Temperature........50-55.
*   24 HR Trend..........Little change.
* Max Humidity...........60-68 percent lower elevations...except
  47-60 percent high elevations.
*   24 HR Trend..........Little change.
* 20-Foot Winds..........
*   Valleys/Lwr Slopes...Drainage winds up to 5 mph.
*   Ridges/Upr Slopes....West winds up to 7 mph shifting to the east
    after midnight.
* CWR....................0 percent.
* Mixing Height..........700 ft AGL.
* Chance of thunder......0 percent.

.THURSDAY...
* Sky/Weather............Sunny.
* Max Temperature........95-100 lower elevations...except 88-94
  higher elevations.
* Min Humidity...........13-18 percent.
* 20-Foot Winds..........
*   Valleys/Lwr Slopes...Upslope winds up to 5 mph.
*   Ridges/Upr Slopes....East winds up to 7 mph in the morning
    becoming variable up to 5 mph.
* Mixing Height..........9900 ft AGL.
* CWR....................0 percent.
* Chance of thunder......0 percent.


$$

CAZ215-210000-
Northern Sacramento Valley to Southern Tehama County Line Below
1000 Ft-
1230 AM PDT Wed Aug 20 2025

.TODAY...
* Sky/Weather............Sunny.
* Max Temperature........98-103.
*   24 HR Trend..........7 degrees warmer.
* Min Humidity...........15-20 percent.
*   24 HR Trend..........Little change.
* 20-Foot Winds..........North winds up to 8 mph.
* CWR....................0 percent.
* Mixing Height..........8300 ft AGL.
* Chance of thunder......0 percent.

.TONIGHT...
* Sky/Weather............Clear.
* Min Temperature........66-71.
*   24 HR Trend..........5 degrees warmer.
* Max Humidity...........40-50 percent.
*   24 HR Trend..........8 percent down.
* 20-Foot Winds..........Northwest winds 4 to 9 mph.
* CWR....................0 percent.
* Mixing Height..........600 ft AGL.
* Chance of thunder......0 percent.

.THURSDAY...
* Sky/Weather............Sunny.
* Max Temperature........102-107.
* Min Humidity...........10-22 percent.
* 20-Foot Winds..........North winds 4 to 9 mph.
* Mixing Height..........7800 ft AGL.
* CWR....................0 percent.
* Chance of thunder......0 percent.


$$

CAZ216-210000-
Central Sacramento Valley in Glenn, Colusa, Yuba, Northern
Sutter, and Butte County Below 1000 Ft-
1230 AM PDT Wed Aug 20 2025

.TODAY...
* Sky/Weather............Sunny.
* Max Temperature........96-101.
*   24 HR Trend..........8 degrees warmer.
* Min Humidity...........18-26 percent.
*   24 HR Trend..........5 percent down.
* 20-Foot Winds..........Northwest winds 4 to 9 mph.
* CWR....................0 percent.
* Mixing Height..........5200 ft AGL.
* Chance of thunder......0 percent.

.TONIGHT...
* Sky/Weather............Clear.
* Min Temperature........64-70.
*   24 HR Trend..........6 degrees warmer.
* Max Humidity...........44-59 percent.
*   24 HR Trend..........13 percent down.
* 20-Foot Winds..........Northwest winds up to 8 mph.
* CWR....................0 percent.
* Mixing Height..........500 ft AGL.
* Chance of thunder......0 percent.

.THURSDAY...
* Sky/Weather............Sunny.
* Max Temperature........99-104.
* Min Humidity...........14-29 percent.
* 20-Foot Winds..........Northwest winds up to 8 mph.
* Mixing Height..........4800 ft AGL.
* CWR....................0 percent.
* Chance of thunder......0 percent.


$$

CAZ217-210000-
Southern Sacramento Valley in Yolo-
Sacramento Far Western Placer, southern Sutter and Solano County
Below 1000 Ft-
1230 AM PDT Wed Aug 20 2025

.TODAY...
* Sky/Weather............Sunny.
* Max Temperature........97-102.
*   24 HR Trend..........7 degrees warmer.
* Min Humidity...........16-21 percent.
*   24 HR Trend..........5 percent down.
* 20-Foot Winds..........Northwest winds up to 8 mph.
* CWR....................0 percent.
* Mixing Height..........5000 ft AGL.
* Chance of thunder......0 percent.

.TONIGHT...
* Sky/Weather............Mostly clear.
* Min Temperature........61-68.
*   24 HR Trend..........6 degrees warmer.
* Max Humidity...........51-66 percent.
*   24 HR Trend..........15 percent down.
* 20-Foot Winds..........Southwest winds up to 8 mph.
* CWR....................0 percent.
* Mixing Height..........400 ft AGL.
* Chance of thunder......0 percent.

.THURSDAY...
* Sky/Weather............Mostly sunny.
* Max Temperature........99-104.
* Min Humidity...........13-28 percent.
* 20-Foot Winds..........Southwest winds up to 8 mph.
* Mixing Height..........4600 ft AGL.
* CWR....................0 percent.
* Chance of thunder......0 percent.


$$

CAZ218-210000-
Carquinez Strait and Delta-
1230 AM PDT Wed Aug 20 2025

.TODAY...
* Sky/Weather............Sunny.
* Max Temperature........93-98.
*   24 HR Trend..........7 degrees warmer.
* Min Humidity...........24-31 percent.
*   24 HR Trend..........4 percent down.
* 20-Foot Winds..........West winds 5 to 11 mph. Local gusts up to
  20 mph in the afternoon.
* CWR....................0 percent.
* Mixing Height..........3900 ft AGL.
* Chance of thunder......0 percent.

.TONIGHT...
* Sky/Weather............Mostly clear.
* Min Temperature........61-66.
*   24 HR Trend..........6 degrees warmer.
* Max Humidity...........65-76 percent.
*   24 HR Trend..........14 percent down.
* 20-Foot Winds..........West winds 6 to 12 mph with local gusts up
  to 20 mph.
* CWR....................0 percent.
* Mixing Height..........500 ft AGL.
* Chance of thunder......0 percent.

.THURSDAY...
* Sky/Weather............Mostly sunny.
* Max Temperature........92-102.
* Min Humidity...........31-46 percent.
* 20-Foot Winds..........West winds 5 to 11 mph. Local gusts up to
  20 mph in the morning.
* Mixing Height..........3000 ft AGL.
* CWR....................0 percent.
* Chance of thunder......0 percent.


$$

CAZ219-210000-
Northern San Joaquin Valley in San Joaquin and Stanislaus
Counties Below 1000 ft-
1230 AM PDT Wed Aug 20 2025

.TODAY...
* Sky/Weather............Sunny.
* Max Temperature........95-100.
*   24 HR Trend..........6 degrees warmer.
* Min Humidity...........18-23 percent.
*   24 HR Trend..........6 percent down.
* 20-Foot Winds..........Northwest winds 7 to 13 mph.
* CWR....................0 percent.
* Mixing Height..........4600 ft AGL.
* Chance of thunder......0 percent.

.TONIGHT...
* Sky/Weather............Mostly clear.
* Min Temperature........63-69.
*   24 HR Trend..........7 degrees warmer.
* Max Humidity...........47-62 percent.
*   24 HR Trend..........9 percent down.
* 20-Foot Winds..........Northwest winds 9 to 15 mph.
* CWR....................0 percent.
* Mixing Height..........500 ft AGL.
* Chance of thunder......0 percent.

.THURSDAY...
* Sky/Weather............Partly cloudy early in the morning then
  clearing.
* Max Temperature........98-103.
* Min Humidity...........13-26 percent.
* 20-Foot Winds..........Northwest winds 6 to 12 mph. Local gusts
  up to 20 mph in the afternoon.
* Mixing Height..........4400 ft AGL.
* CWR....................0 percent.
* Chance of thunder......0 percent.


$$

CAZ263-279-210000-
Southeast Edge Shasta-Trinity NF and Western Portions of Tehama-
Glenn Unit-Eastern Mendocino NF-
1230 AM PDT Wed Aug 20 2025

.TODAY...
* Sky/Weather............Sunny.
* Max Temperature........95-100 lower elevations...except 79-89
  higher elevations.
*   24 HR Trend..........6 degrees warmer.
* Min Humidity...........18-24 percent.
*   24 HR Trend..........4 percent down.
* 20-Foot Winds..........
*   Valleys/Lwr Slopes...North winds 4 to 9 mph.
*   Ridges/Upr Slopes....North winds 4 to 9 mph.
* CWR....................0 percent.
* Mixing Height..........8100 ft AGL.
* Chance of thunder......0 percent.

.TONIGHT...
* Sky/Weather............Clear.
* Min Temperature........72-77 lower elevations...except 63-71
  higher elevations.
*   24 HR Trend..........6 degrees warmer.
* Max Humidity...........32-41 percent.
*   24 HR Trend..........7 percent down.
* 20-Foot Winds..........
*   Valleys/Lwr Slopes...Northwest winds 6 to 12 mph.
*   Ridges/Upr Slopes....Northwest winds 6 to 12 mph.
* CWR....................0 percent.
* Mixing Height..........600 ft AGL.
* Chance of thunder......0 percent.

.THURSDAY...
* Sky/Weather............Sunny.
* Max Temperature........99-104 lower elevations...except 83-93
  higher elevations.
* Min Humidity...........12-27 percent.
* 20-Foot Winds..........
*   Valleys/Lwr Slopes...Northwest winds 5 to 11 mph shifting to the
    northeast up to 8 mph in the afternoon.
*   Ridges/Upr Slopes....Northwest winds 6 to 12 mph shifting to the
    east up to 8 mph in the afternoon.
* Mixing Height..........7200 ft AGL.
* CWR....................0 percent.
* Chance of thunder......0 percent.


$$

CAZ266-210000-
Northern Sierra Foothills from 1000 to 3000 Ft. Includes portions
of Shasta-Trinity and Butte Units-
1230 AM PDT Wed Aug 20 2025

.TODAY...
* Sky/Weather............Sunny.
* Max Temperature........90-96.
*   24 HR Trend..........7 degrees warmer.
* Min Humidity...........15-20 percent.
*   24 HR Trend..........4 percent down.
* 20-Foot Winds..........
*   Valleys/Lwr Slopes...Northwest winds 4 to 10 mph.
*   Ridges/Upr Slopes....Northwest winds 4 to 10 mph.
* CWR....................0 percent.
* Mixing Height..........6700 ft AGL.
* Chance of thunder......0 percent.

.TONIGHT...
* Sky/Weather............Clear.
* Min Temperature........66-73.
*   24 HR Trend..........6 degrees warmer.
* Max Humidity...........29-40 percent.
*   24 HR Trend..........6 percent down.
* 20-Foot Winds..........
*   Valleys/Lwr Slopes...Northeast winds 4 to 10 mph.
*   Ridges/Upr Slopes....Northeast winds 4 to 10 mph.
* CWR....................0 percent.
* Mixing Height..........500 ft AGL.
* Chance of thunder......0 percent.

.THURSDAY...
* Sky/Weather............Sunny.
* Max Temperature........97-102 lower elevations...except 92-98
  higher elevations.
* Min Humidity...........11-24 percent.
* 20-Foot Winds..........
*   Valleys/Lwr Slopes...Northeast winds 7 to 13 mph in the morning
    becoming upslope up to 5 mph.
*   Ridges/Upr Slopes....Northeast winds 5 to 11 mph in the morning
    becoming variable up to 5 mph.
* Mixing Height..........6000 ft AGL.
* CWR....................0 percent.
* Chance of thunder......0 percent.


$$

CAZ220-267-210000-
Southern Motherlode From 1000 to 3000 Ft. Includes portions of
Toulumne-Calaveras Unit-
Northern Motherlode From 1000 to 3000 Ft. Includes portions of
Nevada-Yuba-Placer-Amador and Eldorado Units-
1230 AM PDT Wed Aug 20 2025

.TODAY...
* Sky/Weather............Sunny.
* Max Temperature........90-95.
*   24 HR Trend..........6 degrees warmer.
* Min Humidity...........14-19 percent.
*   24 HR Trend..........8 percent down.
* 20-Foot Winds..........
*   Valleys/Lwr Slopes...Northwest winds 4 to 9 mph.
*   Ridges/Upr Slopes....Northwest winds 4 to 9 mph.
* CWR....................0 percent.
* Mixing Height..........5000 ft AGL.
* Chance of thunder......0 percent.

.TONIGHT...
* Sky/Weather............Mostly clear.
* Min Temperature........65-70.
*   24 HR Trend..........6 degrees warmer.
* Max Humidity...........33-40 percent.
*   24 HR Trend..........13 percent down.
* 20-Foot Winds..........
*   Valleys/Lwr Slopes...Northeast winds up to 8 mph.
*   Ridges/Upr Slopes....Northeast winds up to 8 mph.
* CWR....................0 percent.
* Mixing Height..........500 ft AGL.
* Chance of thunder......0 percent.

.THURSDAY...
* Sky/Weather............Mostly sunny.
* Max Temperature........95-100.
* Min Humidity...........13-23 percent.
* 20-Foot Winds..........
*   Valleys/Lwr Slopes...Northeast winds up to 7 mph shifting to the
    west up to 8 mph in the afternoon.
*   Ridges/Upr Slopes....East winds up to 8 mph shifting to the west
    in the afternoon.
* Mixing Height..........5000 ft AGL.
* CWR....................0 percent.
* Chance of thunder......0 percent.


$$

CAZ268-210000-
Northern Sierra Including Lassen NP and Plumas and Lassen NF/S
West of the Sierra Crest (West of Evans Peak-Grizzly Peak-
Beckworth Peak)-
1230 AM PDT Wed Aug 20 2025

.TODAY...
* Sky/Weather............Sunny.
* Max Temperature........82-90 lower elevations...except 75-83
  higher elevations.
*   24 HR Trend..........6 degrees warmer.
* Min Humidity...........15-23 percent.
*   24 HR Trend..........4 percent down.
* 20-Foot Winds..........
*   Valleys/Lwr Slopes...Northeast winds 4 to 10 mph shifting to the
    west up to 7 mph in the afternoon.
*   Ridges/Upr Slopes....Northeast winds 4 to 10 mph shifting to the
    west up to 8 mph in the afternoon.
* CWR....................0 percent.
* Mixing Height..........7400 ft AGL.
* Chance of thunder......0 percent.

.TONIGHT...
* Sky/Weather............Clear.
* Min Temperature........53-63.
*   24 HR Trend..........6 degrees warmer.
* Max Humidity...........32-47 percent...except 48-62 percent in
  the high mountain valleys.
*   24 HR Trend..........7 percent down.
* 20-Foot Winds..........
*   Valleys/Lwr Slopes...Northwest winds 4 to 9 mph shifting to the
    northeast 5 to 11 mph after midnight.
*   Ridges/Upr Slopes....North winds 5 to 11 mph.
* CWR....................0 percent.
* Mixing Height..........300 ft AGL.
* Chance of thunder......0 percent.

.THURSDAY...
* Sky/Weather............Sunny.
* Max Temperature........87-93 lower elevations...except 80-88
  higher elevations.
* Min Humidity...........11-24 percent.
* 20-Foot Winds..........
*   Valleys/Lwr Slopes...Northeast winds 5 to 11 mph shifting to the
    southwest up to 8 mph in the afternoon.
*   Ridges/Upr Slopes....East winds 5 to 11 mph shifting to the south
    up to 8 mph in the afternoon.
* Mixing Height..........8000 ft AGL.
* CWR....................0 percent.
* Chance of thunder......0 percent.


$$

CAZ221-269-210000-
Stanislaus NF West of the Sierra Crest-
Northern Sierra Including the Tahoe and Eldorado NF/S West of the
Sierra Crest-
1230 AM PDT Wed Aug 20 2025

.TODAY...
* Sky/Weather............Sunny.
* Max Temperature........86-92 lower elevations...except 74-84
  higher elevations.
*   24 HR Trend..........5 degrees warmer.
* Min Humidity...........15-20 percent.
*   24 HR Trend..........9 percent down.
* 20-Foot Winds..........
*   Valleys/Lwr Slopes...North winds up to 7 mph shifting to the west
    up to 8 mph in the afternoon.
*   Ridges/Upr Slopes....Southeast winds up to 8 mph shifting to the
    west 4 to 9 mph in the afternoon.
* CWR....................0 percent.
* Mixing Height..........5500 ft AGL.
* Chance of thunder......0 percent.

.TONIGHT...
* Sky/Weather............Mostly clear.
* Min Temperature........61-69 lower elevations...except 51-61
  higher elevations.
*   24 HR Trend..........6 degrees warmer.
* Max Humidity...........30-41 percent.
*   24 HR Trend..........17 percent down.
* 20-Foot Winds..........
*   Valleys/Lwr Slopes...Northeast winds 5 to 11 mph.
*   Ridges/Upr Slopes....Northeast winds 5 to 11 mph.
* CWR....................0 percent.
* Mixing Height..........300 ft AGL.
* Chance of thunder......0 percent.

.THURSDAY...
* Sky/Weather............Partly cloudy early in the morning then
  clearing.
* Max Temperature........90-96 lower elevations...except 77-87
  higher elevations.
* Min Humidity...........13-28 percent.
* 20-Foot Winds..........
*   Valleys/Lwr Slopes...East winds 4 to 9 mph shifting to the
    southwest up to 8 mph in the afternoon.
*   Ridges/Upr Slopes....East winds 5 to 11 mph shifting to the
    southwest 4 to 9 mph in the afternoon.
* Mixing Height..........6300 ft AGL.
* CWR....................0 percent.
* Chance of thunder......0 percent.


$$


.Extended...

...Shasta County Mountains and Coastal Range
.THURSDAY NIGHT...Clear. Lows 58 to 68. Northwest winds up to
10 mph.
.FRIDAY...Mostly sunny. Highs 88 to 98. East winds up to 10 mph.
.FRIDAY NIGHT...Mostly clear. Lows 62 to 72. West winds up to
10 mph.
.SATURDAY...Mostly sunny. Highs 88 to 98. Southeast winds up to
10 mph.
.SATURDAY NIGHT...Mostly clear. Lows 62 to 72. Variable less than
5 mph.
.SUNDAY...Sunny. Highs 86 to 96. Southeast winds up to 10 mph.
.SUNDAY NIGHT...Clear. Lows 60 to 70. Variable less than 5 mph.

...Northern Sierra and Lassen Park
.THURSDAY NIGHT...Mostly clear. Lows 59 to 69. Northeast winds up
to 10 mph.
.FRIDAY...Mostly sunny. Highs 89 to 98. South winds 5 to 15 mph.
.FRIDAY NIGHT...Mostly clear. Lows 62 to 72. East winds up to
10 mph.
.SATURDAY...Partly cloudy with a slight chance of showers. Highs
88 to 97. Southwest winds up to 10 mph.
.SATURDAY NIGHT...Partly cloudy with a slight chance of showers.
Lows 61 to 71. Variable less than 5 mph.
.SUNDAY...Partly cloudy with a slight chance of showers. Highs
87 to 95. Southwest winds up to 10 mph.
.SUNDAY NIGHT...Mostly clear. Lows 60 to 70. Variable less than
5 mph.

...Sierra Nevada Foothills
.THURSDAY NIGHT...Mostly clear. Lows 69 to 74. East winds up to
10 mph.
.FRIDAY...Mostly sunny. Highs 96 to 101. Southwest winds 5 to
15 mph.
.FRIDAY NIGHT...Mostly clear. Lows 71 to 77. East winds up to
10 mph.
.SATURDAY...Partly cloudy with a slight chance of showers. Highs
95 to 100. Variable less than 5 mph.
.SATURDAY NIGHT...Mostly clear. Lows 70 to 75. Variable less than
5 mph.
.SUNDAY...Partly cloudy with a slight chance of showers. Highs
93 to 98. Variable less than 5 mph.
.SUNDAY NIGHT...Mostly clear. Lows 67 to 73. Variable less than
5 mph.

...Central Valley and Delta
.THURSDAY NIGHT...Mostly clear. Lows 61 to 69. Southwest winds
5 to 15 mph.
.FRIDAY...Mostly sunny. Highs 100 to 105. West winds 5 to 15 mph.
.FRIDAY NIGHT...Mostly clear. Lows 64 to 72. Southwest winds 5 to
15 mph.
.SATURDAY...Mostly sunny. Highs 99 to 104. Southwest winds up to
10 mph.
.SATURDAY NIGHT...Mostly clear. Lows 63 to 70. Southwest winds up
to 10 mph.
.SUNDAY...Sunny. Highs 96 to 101. Southwest winds up to 10 mph.
.SUNDAY NIGHT...Mostly clear. Lows 61 to 68. Southwest winds up
to 10 mph.

$$