840
FNUS56 KSTO 212040 AAA
FWFSTO

Fire Weather Planning Forecast for Interior Northern California...UPDATED
National Weather Service Sacramento CA
140 PM PDT Thu Aug 21 2025

...Hot and Dry Conditions Bring Elevated Fire Weather Concerns on
Thursday and Friday and Mountain Thunderstorms Expected Friday
through the Weekend...

.DISCUSSION...
Hot and dry conditions continue today with poor to moderate
overnight recovery and daytime humidities in the teens for the
northern Sacramento Valley and Valley foothills. Isolated mountain
chances begin Friday and increase this weekend into early next
week, primarily over the Sierra and Southern Cascades.

CAZ213-221115-
Eastern Portion of Shasta-Trinity NF-
140 PM PDT Thu Aug 21 2025

.REST OF TODAY...
* Sky/Weather............Sunny.
* Max Temperature........101-106 lower elevations...except 91-100
  higher elevations.
*   24 HR Trend..........MISSING.
* Min Humidity...........8-13 percent.
*   24 HR Trend..........MISSING.
* 20-Foot Winds..........
*   Valleys/Lwr Slopes...Upslope winds up to 5 mph.
*   Ridges/Upr Slopes....South winds up to 8 mph.
* CWR....................0 percent.
* Mixing Height..........9300 ft AGL.
* Chance of thunder......0 percent.

.TONIGHT...
* Sky/Weather............Clear.
* Min Temperature........68-73 lower elevations...except 58-68
  higher elevations.
*   24 HR Trend..........Little change.
* Max Humidity...........30-45 percent.
*   24 HR Trend..........9 percent down.
* 20-Foot Winds..........
*   Valleys/Lwr Slopes...Drainage winds up to 5 mph becoming north up
    to 7 mph after midnight.
*   Ridges/Upr Slopes....West winds up to 8 mph shifting to the north
    4 to 9 mph after midnight.
* CWR....................0 percent.
* Mixing Height..........700 ft AGL.
* Chance of thunder......0 percent.

.FRIDAY...
* Sky/Weather............Mostly sunny.
* Max Temperature........100-105 lower elevations...except 89-99
  higher elevations.
* Min Humidity...........8-17 percent.
* 20-Foot Winds..........
*   Valleys/Lwr Slopes...North winds up to 8 mph shifting to the
    south up to 7 mph in the afternoon.
*   Ridges/Upr Slopes....Northeast winds 4 to 9 mph shifting to the
    south in the afternoon.
* Mixing Height..........6500 ft AGL.
* CWR....................0 percent.
* Chance of thunder......0 percent.


$$

CAZ214-221115-
Burney Basin and Northeast Plateau in Shasta County Including
Northwest Lassen NF north of Lassen NP-
140 PM PDT Thu Aug 21 2025

.REST OF TODAY...
* Sky/Weather............Sunny.
* Max Temperature........95-100 lower elevations...except 89-94
  higher elevations.
*   24 HR Trend..........MISSING.
* Min Humidity...........10-15 percent.
*   24 HR Trend..........MISSING.
* 20-Foot Winds..........
*   Valleys/Lwr Slopes...West winds up to 8 mph.
*   Ridges/Upr Slopes....West winds up to 8 mph.
* CWR....................0 percent.
* Mixing Height..........10400 ft AGL.
* Chance of thunder......0 percent.

.TONIGHT...
* Sky/Weather............Clear.
* Min Temperature........53-59.
*   24 HR Trend..........4 degrees warmer.
* Max Humidity...........37-49 percent.
*   24 HR Trend..........16 percent down.
* 20-Foot Winds..........
*   Valleys/Lwr Slopes...West winds up to 7 mph in the evening
    becoming drainage up to 5 mph.
*   Ridges/Upr Slopes....Southwest winds up to 7 mph in the evening
    becoming variable up to 5 mph.
* CWR....................0 percent.
* Mixing Height..........700 ft AGL.
* Chance of thunder......0 percent.

.FRIDAY...
* Sky/Weather............Mostly sunny.
* Max Temperature........95-100 lower elevations...except 89-95
  higher elevations.
* Min Humidity...........12-17 percent.
* 20-Foot Winds..........
*   Valleys/Lwr Slopes...Upslope winds up to 5 mph becoming west 4 to
    9 mph with local gusts up to 20 mph in the afternoon.
*   Ridges/Upr Slopes....Variable winds up to 7 mph becoming west 4
    to 9 mph with local gusts up to 20 mph in the afternoon.
* Mixing Height..........8200 ft AGL.
* CWR....................0 percent.
* Chance of thunder......0 percent.


$$

CAZ215-221115-
Northern Sacramento Valley to Southern Tehama County Line Below
1000 Ft-
140 PM PDT Thu Aug 21 2025

.REST OF TODAY...
* Sky/Weather............Sunny.
* Max Temperature........103-108.
*   24 HR Trend..........MISSING.
* Min Humidity...........10-15 percent.
*   24 HR Trend..........MISSING.
* 20-Foot Winds..........South winds up to 7 mph.
* CWR....................0 percent.
* Mixing Height..........8600 ft AGL.
* Chance of thunder......0 percent.

.TONIGHT...
* Sky/Weather............Clear.
* Min Temperature........68-73.
*   24 HR Trend..........Little change.
* Max Humidity...........37-45 percent.
*   24 HR Trend..........Little change.
* 20-Foot Winds..........South winds up to 7 mph shifting to the
  north after midnight.
* CWR....................0 percent.
* Mixing Height..........600 ft AGL.
* Chance of thunder......0 percent.

.FRIDAY...
* Sky/Weather............Mostly sunny.
* Max Temperature........102-107.
* Min Humidity...........9-21 percent.
* 20-Foot Winds..........North winds up to 7 mph shifting to the
  south 4 to 9 mph in the afternoon.
* Mixing Height..........6300 ft AGL.
* CWR....................0 percent.
* Chance of thunder......0 percent.


$$

CAZ216-221115-
Central Sacramento Valley in Glenn, Colusa, Yuba, Northern
Sutter, and Butte County Below 1000 Ft-
140 PM PDT Thu Aug 21 2025

.REST OF TODAY...
* Sky/Weather............Mostly sunny.
* Max Temperature........100-105.
*   24 HR Trend..........MISSING.
* Min Humidity...........17-23 percent.
*   24 HR Trend..........MISSING.
* 20-Foot Winds..........South winds 4 to 9 mph.
* CWR....................0 percent.
* Mixing Height..........4400 ft AGL.
* Chance of thunder......0 percent.

.TONIGHT...
* Sky/Weather............Mostly clear.
* Min Temperature........64-70.
*   24 HR Trend..........Little change.
* Max Humidity...........47-62 percent.
*   24 HR Trend..........Little change.
* 20-Foot Winds..........South winds up to 8 mph shifting to the
  east up to 7 mph after midnight.
* CWR....................0 percent.
* Mixing Height..........500 ft AGL.
* Chance of thunder......0 percent.

.FRIDAY...
* Sky/Weather............Sunny.
* Max Temperature........98-103.
* Min Humidity...........13-28 percent.
* 20-Foot Winds..........North winds up to 7 mph shifting to the
  south 4 to 9 mph in the afternoon.
* Mixing Height..........4500 ft AGL.
* CWR....................0 percent.
* Chance of thunder......0 percent.


$$

CAZ217-221115-
Southern Sacramento Valley in Yolo-
Sacramento Far Western Placer, southern Sutter and Solano County
Below 1000 Ft-
140 PM PDT Thu Aug 21 2025

.REST OF TODAY...
* Sky/Weather............Mostly sunny.
* Max Temperature........101-106.
*   24 HR Trend..........MISSING.
* Min Humidity...........17-22 percent.
*   24 HR Trend..........MISSING.
* 20-Foot Winds..........West winds 4 to 10 mph.
* CWR....................0 percent.
* Mixing Height..........4800 ft AGL.
* Chance of thunder......0 percent.

.TONIGHT...
* Sky/Weather............Mostly clear.
* Min Temperature........61-69.
*   24 HR Trend..........Little change.
* Max Humidity...........53-68 percent.
*   24 HR Trend..........Little change.
* 20-Foot Winds..........South winds up to 8 mph.
* CWR....................0 percent.
* Mixing Height..........500 ft AGL.
* Chance of thunder......0 percent.

.FRIDAY...
* Sky/Weather............Sunny.
* Max Temperature........99-104.
* Min Humidity...........12-27 percent.
* 20-Foot Winds..........Southwest winds up to 8 mph.
* Mixing Height..........4200 ft AGL.
* CWR....................0 percent.
* Chance of thunder......0 percent.


$$

CAZ218-221115-
Carquinez Strait and Delta-
140 PM PDT Thu Aug 21 2025

.REST OF TODAY...
* Sky/Weather............Mostly sunny.
* Max Temperature........96-101.
*   24 HR Trend..........MISSING.
* Min Humidity...........21-30 percent.
*   24 HR Trend..........MISSING.
* 20-Foot Winds..........West winds 8 to 14 mph.
* CWR....................0 percent.
* Mixing Height..........3800 ft AGL.
* Chance of thunder......0 percent.

.TONIGHT...
* Sky/Weather............Partly cloudy.
* Min Temperature........59-64.
*   24 HR Trend..........Little change.
* Max Humidity...........66-80 percent.
*   24 HR Trend..........4 percent up.
* 20-Foot Winds..........West winds 6 to 12 mph with local gusts up
  to 20 mph.
* CWR....................0 percent.
* Mixing Height..........400 ft AGL.
* Chance of thunder......0 percent.

.FRIDAY...
* Sky/Weather............Mostly sunny.
* Max Temperature........90-100.
* Min Humidity...........35-50 percent.
* 20-Foot Winds..........West winds 6 to 12 mph.
* Mixing Height..........2200 ft AGL.
* CWR....................0 percent.
* Chance of thunder......0 percent.


$$

CAZ219-221115-
Northern San Joaquin Valley in San Joaquin and Stanislaus
Counties Below 1000 ft-
140 PM PDT Thu Aug 21 2025

.REST OF TODAY...
* Sky/Weather............Partly cloudy.
* Max Temperature........99-104.
*   24 HR Trend..........MISSING.
* Min Humidity...........17-22 percent.
*   24 HR Trend..........MISSING.
* 20-Foot Winds..........Northwest winds 7 to 13 mph.
* CWR....................0 percent.
* Mixing Height..........4500 ft AGL.
* Chance of thunder......0 percent.

.TONIGHT...
* Sky/Weather............Partly cloudy.
* Min Temperature........65-72.
*   24 HR Trend..........4 degrees warmer.
* Max Humidity...........42-57 percent.
*   24 HR Trend..........5 percent down.
* 20-Foot Winds..........Northwest winds 6 to 12 mph.
* CWR....................0 percent.
* Mixing Height..........500 ft AGL.
* Chance of thunder......0 percent.

.FRIDAY...
* Sky/Weather............Sunny.
* Max Temperature........99-104.
* Min Humidity...........12-23 percent.
* 20-Foot Winds..........Northwest winds 4 to 9 mph.
* Mixing Height..........4100 ft AGL.
* CWR....................0 percent.
* Chance of thunder......2 percent.


$$

CAZ263-279-221115-
Southeast Edge Shasta-Trinity NF and Western Portions of Tehama-
Glenn Unit-Eastern Mendocino NF-
140 PM PDT Thu Aug 21 2025

.REST OF TODAY...
* Sky/Weather............Sunny.
* Max Temperature........101-106 lower elevations...except 85-95
  higher elevations.
*   24 HR Trend..........MISSING.
* Min Humidity...........13-19 percent.
*   24 HR Trend..........MISSING.
* 20-Foot Winds..........
*   Valleys/Lwr Slopes...East winds up to 8 mph.
*   Ridges/Upr Slopes....East winds 4 to 9 mph.
* CWR....................0 percent.
* Mixing Height..........8100 ft AGL.
* Chance of thunder......0 percent.

.TONIGHT...
* Sky/Weather............Mostly clear.
* Min Temperature........73-78 lower elevations...except 65-71
  higher elevations.
*   24 HR Trend..........Little change.
* Max Humidity...........30-36 percent.
*   24 HR Trend..........Little change.
* 20-Foot Winds..........
*   Valleys/Lwr Slopes...West winds 4 to 9 mph.
*   Ridges/Upr Slopes....Northwest winds 4 to 9 mph.
* CWR....................0 percent.
* Mixing Height..........600 ft AGL.
* Chance of thunder......0 percent.

.FRIDAY...
* Sky/Weather............Mostly sunny.
* Max Temperature........99-104 lower elevations...except 83-93
  higher elevations.
* Min Humidity...........11-24 percent.
* 20-Foot Winds..........
*   Valleys/Lwr Slopes...East winds 4 to 9 mph.
*   Ridges/Upr Slopes....East winds 4 to 9 mph.
* Mixing Height..........6100 ft AGL.
* CWR....................0 percent.
* Chance of thunder......0 percent.


$$

CAZ266-221115-
Northern Sierra Foothills from 1000 to 3000 Ft. Includes portions
of Shasta-Trinity and Butte Units-
140 PM PDT Thu Aug 21 2025

.REST OF TODAY...
* Sky/Weather............Mostly sunny.
* Max Temperature........98-103 lower elevations...except 93-99
  higher elevations.
*   24 HR Trend..........MISSING.
* Min Humidity...........13-18 percent.
*   24 HR Trend..........MISSING.
* 20-Foot Winds..........
*   Valleys/Lwr Slopes...Southwest winds up to 7 mph.
*   Ridges/Upr Slopes....Variable winds up to 7 mph.
* CWR....................0 percent.
* Mixing Height..........6700 ft AGL.
* Chance of thunder......0 percent.

.TONIGHT...
* Sky/Weather............Mostly clear.
* Min Temperature........69-75.
*   24 HR Trend..........4 degrees warmer.
* Max Humidity...........27-34 percent.
*   24 HR Trend..........Little change.
* 20-Foot Winds..........
*   Valleys/Lwr Slopes...East winds 4 to 10 mph.
*   Ridges/Upr Slopes....East winds 4 to 10 mph.
* CWR....................0 percent.
* Mixing Height..........500 ft AGL.
* Chance of thunder......0 percent.

.FRIDAY...
* Sky/Weather............Sunny.
* Max Temperature........97-102 lower elevations...except 92-98
  higher elevations.
* Min Humidity...........10-23 percent.
* 20-Foot Winds..........
*   Valleys/Lwr Slopes...North winds 6 to 12 mph shifting to the
    southwest 4 to 9 mph with local gusts up to 20 mph in the
    afternoon.
*   Ridges/Upr Slopes....East winds 4 to 10 mph shifting to the
    southwest up to 8 mph in the afternoon.
* Mixing Height..........5700 ft AGL.
* CWR....................0 percent.
* Chance of thunder......0 percent.


$$

CAZ220-267-221115-
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-
140 PM PDT Thu Aug 21 2025

.REST OF TODAY...
* Sky/Weather............Mostly sunny.
* Max Temperature........94-99.
*   24 HR Trend..........MISSING.
* Min Humidity...........14-19 percent.
*   24 HR Trend..........MISSING.
* 20-Foot Winds..........
*   Valleys/Lwr Slopes...West winds up to 8 mph.
*   Ridges/Upr Slopes....West winds up to 8 mph.
* CWR....................0 percent.
* Mixing Height..........4800 ft AGL.
* Chance of thunder......0 percent.

.TONIGHT...
* Sky/Weather............Mostly clear.
* Min Temperature........69-74.
*   24 HR Trend..........6 degrees warmer.
* Max Humidity...........34-40 percent.
*   24 HR Trend..........Little change.
* 20-Foot Winds..........
*   Valleys/Lwr Slopes...Northwest winds up to 7 mph shifting to the
    east up to 8 mph after midnight.
*   Ridges/Upr Slopes....Northwest winds up to 7 mph shifting to the
    east after midnight.
* CWR....................0 percent.
* Mixing Height..........500 ft AGL.
* Chance of thunder......0 percent.

.FRIDAY...
* Sky/Weather............Mostly sunny.
* Max Temperature........96-101.
* Min Humidity...........12-20 percent.
* 20-Foot Winds..........
*   Valleys/Lwr Slopes...Southeast winds up to 7 mph shifting to the
    west up to 8 mph in the afternoon.
*   Ridges/Upr Slopes....Southeast winds up to 7 mph shifting to the
    southwest up to 8 mph in the afternoon.
* Mixing Height..........5400 ft AGL.
* CWR....................0 percent.
* Chance of thunder......2 percent.


$$

CAZ268-221115-
Northern Sierra Including Lassen NP and Plumas and Lassen NF/S
West of the Sierra Crest (West of Evans Peak-Grizzly Peak-
Beckworth Peak)-
140 PM PDT Thu Aug 21 2025

.REST OF TODAY...
* Sky/Weather............Mostly sunny.
* Max Temperature........88-95 lower elevations...except 81-88
  higher elevations.
*   24 HR Trend..........MISSING.
* Min Humidity...........13-19 percent.
*   24 HR Trend..........MISSING.
* 20-Foot Winds..........
*   Valleys/Lwr Slopes...Southwest winds up to 8 mph.
*   Ridges/Upr Slopes....Southwest winds up to 8 mph.
* CWR....................0 percent.
* Mixing Height..........8200 ft AGL.
* Chance of thunder......0 percent.

.TONIGHT...
* Sky/Weather............Mostly clear.
* Min Temperature........55-65.
*   24 HR Trend..........Little change.
* Max Humidity...........27-39 percent...except 40-55 percent in
  the high mountain valleys.
*   24 HR Trend..........6 percent down.
* 20-Foot Winds..........
*   Valleys/Lwr Slopes...Southwest winds up to 8 mph shifting to the
    east 4 to 9 mph after midnight.
*   Ridges/Upr Slopes....Southwest winds up to 8 mph shifting to the
    east 4 to 9 mph after midnight.
* CWR....................0 percent.
* Mixing Height..........300 ft AGL.
* Chance of thunder......0 percent.

.FRIDAY...
* Sky/Weather............Mostly sunny.
* Max Temperature........87-93 lower elevations...except 81-89
  higher elevations.
* Min Humidity...........11-23 percent.
* 20-Foot Winds..........
*   Valleys/Lwr Slopes...East winds 4 to 10 mph shifting to the
    southwest with local gusts up to 20 mph in the afternoon.
*   Ridges/Upr Slopes....Southeast winds 4 to 10 mph shifting to the
    southwest with local gusts up to 20 mph in the afternoon.
* Mixing Height..........6500 ft AGL.
* CWR....................0 percent.
* Chance of thunder......0 percent.


$$

CAZ221-269-221115-
Stanislaus NF West of the Sierra Crest-
Northern Sierra Including the Tahoe and Eldorado NF/S West of the
Sierra Crest-
140 PM PDT Thu Aug 21 2025

.REST OF TODAY...
* Sky/Weather............Partly cloudy.
* Max Temperature........90-96 lower elevations...except 78-88
  higher elevations.
*   24 HR Trend..........MISSING.
* Min Humidity...........14-19 percent.
*   24 HR Trend..........MISSING.
* 20-Foot Winds..........
*   Valleys/Lwr Slopes...West winds up to 8 mph.
*   Ridges/Upr Slopes....Southwest winds 4 to 9 mph.
* CWR....................0 percent.
* Mixing Height..........5800 ft AGL.
* Chance of thunder......0 percent.

.TONIGHT...
* Sky/Weather............Partly cloudy.
* Min Temperature........64-72 lower elevations...except 54-64
  higher elevations.
*   24 HR Trend..........4 degrees warmer.
* Max Humidity...........31-45 percent.
*   24 HR Trend..........Little change.
* 20-Foot Winds..........
*   Valleys/Lwr Slopes...Northeast winds up to 8 mph.
*   Ridges/Upr Slopes....South winds up to 8 mph shifting to the east
    after midnight.
* CWR....................0 percent.
* Mixing Height..........300 ft AGL.
* Chance of thunder......0 percent.

.FRIDAY...
* Sky/Weather............Mostly sunny. At higher elevations, a
  slight chance of showers late in the afternoon.
* Max Temperature........92-98 lower elevations...except 78-88
  higher elevations.
* Min Humidity...........14-29 percent.
* 20-Foot Winds..........
*   Valleys/Lwr Slopes...Southwest winds 4 to 10 mph.
*   Ridges/Upr Slopes....Southwest winds 4 to 10 mph. Local gusts up
    to 20 mph in the afternoon.
* Mixing Height..........6600 ft AGL.
* CWR....................0 percent.
* Chance of thunder......5 percent.


$$


.Extended...

...Shasta County Mountains and Coastal Range
.FRIDAY NIGHT...Mostly clear. Lows 63 to 73. 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. West winds up to
10 mph.
.SUNDAY...Mostly sunny. Highs 86 to 96. Southeast winds up to
10 mph.
.SUNDAY NIGHT...Mostly clear. Lows 60 to 70. Variable less than
5 mph.
.MONDAY...Sunny. Highs 86 to 96. East winds up to 10 mph.
.MONDAY NIGHT...Partly cloudy with a slight chance of showers.
Lows 59 to 69. Variable less than 5 mph.

...Northern Sierra and Lassen Park
.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 5 to 15 mph.
.SATURDAY NIGHT...Partly cloudy with a slight chance of showers.
Lows 61 to 71. East winds up to 10 mph.
.SUNDAY...Partly cloudy with a slight chance of showers and
thunderstorms. Highs 86 to 95. Variable less than 5 mph.
.SUNDAY NIGHT...Partly cloudy with a slight chance of showers.
Lows 59 to 69. Variable less than 5 mph.
.MONDAY...Partly cloudy with a chance of showers and a slight
chance of thunderstorms. Highs 85 to 94. Variable less than
5 mph.
.MONDAY NIGHT...Partly cloudy with a slight chance of showers.
Lows 58 to 68. Variable less than 5 mph.

...Sierra Nevada Foothills
.FRIDAY NIGHT...Mostly clear. Lows 71 to 77. East winds up to
10 mph.
.SATURDAY...Mostly sunny. Highs 95 to 100. Southwest winds up to
10 mph.
.SATURDAY NIGHT...Mostly clear. Lows 69 to 74. East winds up to
10 mph.
.SUNDAY...Partly cloudy with a slight chance of showers. Highs
93 to 99. Variable less than 5 mph.
.SUNDAY NIGHT...Clear. Lows 68 to 73. Variable less than 5 mph.
.MONDAY...Partly cloudy with a slight chance of showers. Highs
92 to 97. Variable less than 5 mph.
.MONDAY NIGHT...Mostly clear. Lows 66 to 72. Variable less than
5 mph.

...Central Valley and Delta
.FRIDAY NIGHT...Mostly clear. Lows 64 to 71. Southwest winds 5 to
15 mph.
.SATURDAY...Mostly sunny. Highs 98 to 103. Southwest winds 5 to
15 mph.
.SATURDAY NIGHT...Mostly clear. Lows 62 to 70. Southwest winds
5 to 15 mph.
.SUNDAY...Mostly sunny. Highs 96 to 101. Southwest winds up to
10 mph.
.SUNDAY NIGHT...Clear. Lows 61 to 68. Southwest winds up to
10 mph.
.MONDAY...Sunny. Highs 95 to 100. Southwest winds up to 10 mph.
.MONDAY NIGHT...Clear. Lows 60 to 67. Southwest winds up to
10 mph.

$$