715
FNUS56 KSTO 180731
FWFSTO
FIRE WEATHER PLANNING FORECAST FOR INTERIOR NORTHERN CALIFORNIA
NATIONAL WEATHER SERVICE SACRAMENTO CA
1230 AM PDT THU SEP 18 2025
NOTE: THIS PRODUCT HAS UPDATED FORECAST DATA BUT THE FORECAST
DISCUSSION IS FROM THE PREVIOUS DAY.
..CHANCE OF THUNDERSTORMS THURSDAY THROUGH SATURDAY
DISCUSSION
WARM AND DRY CONDITIONS THROUGH WEDNESDAY. REMNANTS OF TROPICAL
STORM MARIO WILL BRING SUBTROPICAL MOISTURE NORTHWARD, RESULTING
IN SHOWER AND THUNDERSTORM CHANCES THURSDAY THROUGH SATURDAY.
LIGHTNING FROM THUNDERSTORMS WILL LEAD TO ELEVATED FIRE WEATHER
CONCERNS, INCLUDING THURSDAY NIGHT INTO FRIDAY MORNING. COOLER
TEMPERATURES, HIGHER RELATIVE HUMIDITY, AND PERIODICALLY BREEZY
ONSHORE WINDS EXPECTED AS WELL.
CAZ213-190000-
EASTERN PORTION OF SHASTA-TRINITY NF-
1230 AM PDT THU SEP 18 2025
TODAY
* SKY/WEATHER............MOSTLY CLOUDY.
* MAX TEMPERATURE........92-97 LOWER ELEVATIONS...EXCEPT 82-92
HIGHER ELEVATIONS.
* 24 HR TREND..........LITTLE CHANGE.
* MIN HUMIDITY...........17-23 PERCENT.
* 24 HR TREND..........LITTLE CHANGE.
* 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 UP TO 8 MPH IN THE AFTERNOON.
* CWR....................0 PERCENT.
* MIXING HEIGHT..........6100 FT AGL.
* CHANCE OF THUNDER......7 PERCENT.
TONIGHT
* SKY/WEATHER............MOSTLY CLOUDY.
* MIN TEMPERATURE........61-67 LOWER ELEVATIONS...EXCEPT 52-62
HIGHER ELEVATIONS.
* 24 HR TREND..........LITTLE CHANGE.
* MAX HUMIDITY...........61-76 PERCENT.
* 24 HR TREND..........20 PERCENT UP.
* 20-FOOT WINDS..........
* VALLEYS/LWR SLOPES...DRAINAGE WINDS 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......7 PERCENT.
FRIDAY
* SKY/WEATHER............MOSTLY CLOUDY. AT HIGHER ELEVATIONS, A
SLIGHT CHANCE OF SHOWERS IN THE AFTERNOON.
* MAX TEMPERATURE........79-84 LOWER ELEVATIONS...EXCEPT 70-78
HIGHER ELEVATIONS.
* MIN HUMIDITY...........39-54 PERCENT.
* 20-FOOT WINDS..........
* VALLEYS/LWR SLOPES...UPSLOPE WINDS UP TO 5 MPH.
* RIDGES/UPR SLOPES....VARIABLE WINDS UP TO 7 MPH BECOMING
SOUTHWEST UP TO 7 MPH IN THE AFTERNOON.
* MIXING HEIGHT..........3600 FT AGL.
* CWR....................10 PERCENT.
* CHANCE OF THUNDER......10 PERCENT.
CAZ214-190000-
BURNEY BASIN AND NORTHEAST PLATEAU IN SHASTA COUNTY INCLUDING
NORTHWEST LASSEN NF NORTH OF LASSEN NP-
1230 AM PDT THU SEP 18 2025
TODAY
* SKY/WEATHER............MOSTLY CLOUDY.
* MAX TEMPERATURE........86-91 LOWER ELEVATIONS...EXCEPT 81-86
HIGHER ELEVATIONS.
* 24 HR TREND..........LITTLE CHANGE.
* MIN HUMIDITY...........16-21 PERCENT.
* 24 HR TREND..........LITTLE CHANGE.
* 20-FOOT WINDS..........
* VALLEYS/LWR SLOPES...UPSLOPE WINDS UP TO 5 MPH BECOMING WEST UP
TO 8 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.
* CWR....................0 PERCENT.
* MIXING HEIGHT..........7300 FT AGL.
* CHANCE OF THUNDER......3 PERCENT.
TONIGHT
* SKY/WEATHER............MOSTLY CLOUDY.
* MIN TEMPERATURE........50-55.
* 24 HR TREND..........LITTLE CHANGE.
* MAX HUMIDITY...........69-81 PERCENT.
* 24 HR TREND..........19 PERCENT UP.
* 20-FOOT WINDS..........
* VALLEYS/LWR SLOPES...WEST WINDS UP TO 8 MPH IN THE EVENING
BECOMING DRAINAGE UP TO 5 MPH.
* RIDGES/UPR SLOPES....SOUTHWEST WINDS UP TO 8 MPH IN THE EVENING
BECOMING VARIABLE UP TO 5 MPH.
* CWR....................0 PERCENT.
* MIXING HEIGHT..........700 FT AGL.
* CHANCE OF THUNDER......3 PERCENT.
FRIDAY
* SKY/WEATHER............MOSTLY CLOUDY. AT HIGHER ELEVATIONS, A
SLIGHT CHANCE OF SHOWERS.
* MAX TEMPERATURE........73-78 LOWER ELEVATIONS...EXCEPT 67-73
HIGHER ELEVATIONS.
* MIN HUMIDITY...........42-57 PERCENT.
* 20-FOOT WINDS..........
* VALLEYS/LWR SLOPES...UPSLOPE WINDS UP TO 5 MPH.
* RIDGES/UPR SLOPES....VARIABLE WINDS UP TO 7 MPH BECOMING
NORTHWEST UP TO 7 MPH IN THE AFTERNOON.
* MIXING HEIGHT..........3900 FT AGL.
* CWR....................10 PERCENT.
* CHANCE OF THUNDER......11 PERCENT.
CAZ215-190000-
NORTHERN SACRAMENTO VALLEY TO SOUTHERN TEHAMA COUNTY LINE BELOW
1000 FT-
1230 AM PDT THU SEP 18 2025
TODAY
* SKY/WEATHER............MOSTLY CLOUDY.
* MAX TEMPERATURE........93-98.
* 24 HR TREND..........LITTLE CHANGE.
* MIN HUMIDITY...........20-26 PERCENT.
* 24 HR TREND..........6 PERCENT UP.
* 20-FOOT WINDS..........NORTH WINDS UP TO 7 MPH SHIFTING TO THE
SOUTH 5 TO 11 MPH WITH LOCAL GUSTS UP TO 20 MPH IN THE AFTERNOON.
* CWR....................0 PERCENT.
* MIXING HEIGHT..........5400 FT AGL.
* CHANCE OF THUNDER......10 PERCENT.
TONIGHT
* SKY/WEATHER............MOSTLY CLOUDY. A SLIGHT CHANCE OF SHOWERS
AFTER MIDNIGHT.
* MIN TEMPERATURE........65-70.
* 24 HR TREND..........LITTLE CHANGE.
* MAX HUMIDITY...........64-71 PERCENT.
* 24 HR TREND..........19 PERCENT UP.
* 20-FOOT WINDS..........SOUTHEAST WINDS UP TO 8 MPH. LOCAL GUSTS
UP TO 20 MPH IN THE EVENING.
* CWR....................0 PERCENT.
* MIXING HEIGHT..........700 FT AGL.
* CHANCE OF THUNDER......10 PERCENT.
FRIDAY
* SKY/WEATHER............MOSTLY CLOUDY. A SLIGHT CHANCE OF SHOWERS
IN THE MORNING.
* MAX TEMPERATURE........78-83.
* MIN HUMIDITY...........47-62 PERCENT.
* 20-FOOT WINDS..........NORTHWEST WINDS UP TO 5 MPH SHIFTING TO
THE SOUTH UP TO 7 MPH IN THE AFTERNOON.
* MIXING HEIGHT..........3600 FT AGL.
* CWR....................10 PERCENT.
* CHANCE OF THUNDER......10 PERCENT.
CAZ216-190000-
CENTRAL SACRAMENTO VALLEY IN GLENN, COLUSA, YUBA, NORTHERN
SUTTER, AND BUTTE COUNTY BELOW 1000 FT-
1230 AM PDT THU SEP 18 2025
TODAY
* SKY/WEATHER............MOSTLY CLOUDY.
* MAX TEMPERATURE........90-95.
* 24 HR TREND..........5 DEGREES COOLER.
* MIN HUMIDITY...........29-38 PERCENT.
* 24 HR TREND..........11 PERCENT UP.
* 20-FOOT WINDS..........NORTHEAST WINDS UP TO 7 MPH SHIFTING TO
THE SOUTHEAST 6 TO 12 MPH WITH LOCAL GUSTS UP TO 20 MPH IN THE
AFTERNOON.
* CWR....................0 PERCENT.
* MIXING HEIGHT..........4400 FT AGL.
* CHANCE OF THUNDER......9 PERCENT.
TONIGHT
* SKY/WEATHER............MOSTLY CLOUDY. A SLIGHT CHANCE OF SHOWERS
AFTER MIDNIGHT.
* MIN TEMPERATURE........64-69.
* 24 HR TREND..........LITTLE CHANGE.
* MAX HUMIDITY...........75-90 PERCENT.
* 24 HR TREND..........28 PERCENT UP.
* 20-FOOT WINDS..........SOUTHEAST WINDS 4 TO 9 MPH.
* CWR....................10 PERCENT.
* MIXING HEIGHT..........500 FT AGL.
* CHANCE OF THUNDER......8 PERCENT.
FRIDAY
* SKY/WEATHER............MOSTLY CLOUDY WITH A SLIGHT CHANCE OF
SHOWERS.
* MAX TEMPERATURE........77-82.
* MIN HUMIDITY...........60-75 PERCENT.
* 20-FOOT WINDS..........SOUTHEAST WINDS UP TO 8 MPH.
* MIXING HEIGHT..........2600 FT AGL.
* CWR....................10 PERCENT.
* CHANCE OF THUNDER......8 PERCENT.
CAZ217-190000-
SOUTHERN SACRAMENTO VALLEY IN YOLO-
SACRAMENTO FAR WESTERN PLACER, SOUTHERN SUTTER AND SOLANO COUNTY
BELOW 1000 FT-
1230 AM PDT THU SEP 18 2025
TODAY
* SKY/WEATHER............MOSTLY CLOUDY.
* MAX TEMPERATURE........89-94.
* 24 HR TREND..........8 DEGREES COOLER.
* MIN HUMIDITY...........31-39 PERCENT.
* 24 HR TREND..........13 PERCENT UP.
* 20-FOOT WINDS..........SOUTH WINDS 4 TO 10 MPH. LOCAL GUSTS UP TO
20 MPH IN THE AFTERNOON.
* CWR....................0 PERCENT.
* MIXING HEIGHT..........3800 FT AGL.
* CHANCE OF THUNDER......6 PERCENT.
TONIGHT
* SKY/WEATHER............MOSTLY CLOUDY WITH A SLIGHT CHANCE OF
SHOWERS.
* MIN TEMPERATURE........63-68.
* 24 HR TREND..........LITTLE CHANGE.
* MAX HUMIDITY...........79-89 PERCENT.
* 24 HR TREND..........25 PERCENT UP.
* 20-FOOT WINDS..........SOUTH WINDS 4 TO 9 MPH.
* CWR....................10 PERCENT.
* MIXING HEIGHT..........500 FT AGL.
* CHANCE OF THUNDER......6 PERCENT.
FRIDAY
* SKY/WEATHER............MOSTLY CLOUDY. A CHANCE OF SHOWERS IN THE
MORNING, THEN A SLIGHT CHANCE OF SHOWERS IN THE AFTERNOON.
* MAX TEMPERATURE........78-83.
* MIN HUMIDITY...........57-72 PERCENT.
* 20-FOOT WINDS..........SOUTH WINDS UP TO 8 MPH.
* MIXING HEIGHT..........2900 FT AGL.
* CWR....................10 PERCENT.
* CHANCE OF THUNDER......6 PERCENT.
CAZ218-190000-
CARQUINEZ STRAIT AND DELTA-
1230 AM PDT THU SEP 18 2025
TODAY
* SKY/WEATHER............MOSTLY CLOUDY.
* MAX TEMPERATURE........82-90.
* 24 HR TREND..........9 DEGREES COOLER.
* MIN HUMIDITY...........36-51 PERCENT.
* 24 HR TREND..........18 PERCENT UP.
* 20-FOOT WINDS..........SOUTHWEST WINDS 6 TO 12 MPH WITH LOCAL
GUSTS UP TO 20 MPH.
* CWR....................0 PERCENT.
* MIXING HEIGHT..........2300 FT AGL.
* CHANCE OF THUNDER......6 PERCENT.
TONIGHT
* SKY/WEATHER............MOSTLY CLOUDY WITH A SLIGHT CHANCE OF
SHOWERS.
* MIN TEMPERATURE........62-67.
* 24 HR TREND..........LITTLE CHANGE.
* MAX HUMIDITY...........85-92 PERCENT.
* 24 HR TREND..........16 PERCENT UP.
* 20-FOOT WINDS..........WEST WINDS 5 TO 11 MPH WITH LOCAL GUSTS UP
TO 20 MPH.
* CWR....................10 PERCENT.
* MIXING HEIGHT..........600 FT AGL.
* CHANCE OF THUNDER......6 PERCENT.
FRIDAY
* SKY/WEATHER............MOSTLY CLOUDY WITH A CHANCE OF SHOWERS IN
THE MORNING, THEN PARTLY CLOUDY WITH A SLIGHT CHANCE OF SHOWERS
IN THE AFTERNOON.
* MAX TEMPERATURE........77-83.
* MIN HUMIDITY...........61-76 PERCENT.
* 20-FOOT WINDS..........SOUTHWEST WINDS 4 TO 9 MPH.
* MIXING HEIGHT..........3200 FT AGL.
* CWR....................10 PERCENT.
* CHANCE OF THUNDER......5 PERCENT.
CAZ219-190000-
NORTHERN SAN JOAQUIN VALLEY IN SAN JOAQUIN AND STANISLAUS
COUNTIES BELOW 1000 FT-
1230 AM PDT THU SEP 18 2025
TODAY
* SKY/WEATHER............MOSTLY CLOUDY.
* MAX TEMPERATURE........86-91.
* 24 HR TREND..........9 DEGREES COOLER.
* MIN HUMIDITY...........33-39 PERCENT.
* 24 HR TREND..........12 PERCENT UP.
* 20-FOOT WINDS..........SOUTH WINDS 5 TO 11 MPH.
* CWR....................0 PERCENT.
* MIXING HEIGHT..........4200 FT AGL.
* CHANCE OF THUNDER......2 PERCENT.
TONIGHT
* SKY/WEATHER............MOSTLY CLOUDY. A SLIGHT CHANCE OF SHOWERS
IN THE EVENING, THEN A CHANCE OF SHOWERS AFTER MIDNIGHT.
* MIN TEMPERATURE........65-70.
* 24 HR TREND..........LITTLE CHANGE.
* MAX HUMIDITY...........86-98 PERCENT.
* 24 HR TREND..........39 PERCENT UP.
* 20-FOOT WINDS..........WEST WINDS UP TO 8 MPH SHIFTING TO THE
NORTHEAST AFTER MIDNIGHT.
* CWR....................30 PERCENT.
* MIXING HEIGHT..........800 FT AGL.
* CHANCE OF THUNDER......5 PERCENT.
FRIDAY
* SKY/WEATHER............MOSTLY CLOUDY WITH A CHANCE OF SHOWERS.
* MAX TEMPERATURE........78-83.
* MIN HUMIDITY...........56-71 PERCENT.
* 20-FOOT WINDS..........SOUTHEAST WINDS UP TO 8 MPH.
* MIXING HEIGHT..........4000 FT AGL.
* CWR....................20 PERCENT.
* CHANCE OF THUNDER......5 PERCENT.
CAZ263-279-190000-
SOUTHEAST EDGE SHASTA-TRINITY NF AND WESTERN PORTIONS OF TEHAMA-
GLENN UNIT-EASTERN MENDOCINO NF-
1230 AM PDT THU SEP 18 2025
TODAY
* SKY/WEATHER............MOSTLY CLOUDY. AT HIGHER ELEVATIONS, A
SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS IN THE AFTERNOON.
* MAX TEMPERATURE........90-95 LOWER ELEVATIONS...EXCEPT 75-85
HIGHER ELEVATIONS.
* 24 HR TREND..........LITTLE CHANGE.
* MIN HUMIDITY...........25-33 PERCENT.
* 24 HR TREND..........7 PERCENT UP.
* 20-FOOT WINDS..........
* VALLEYS/LWR SLOPES...NORTHWEST WINDS UP TO 8 MPH SHIFTING TO THE
SOUTHEAST 4 TO 9 MPH WITH LOCAL GUSTS UP TO 20 MPH IN THE
AFTERNOON.
* RIDGES/UPR SLOPES....SOUTH WINDS 4 TO 9 MPH.
* CWR....................0 PERCENT.
* MIXING HEIGHT..........5800 FT AGL.
* CHANCE OF THUNDER......14 PERCENT.
TONIGHT
* SKY/WEATHER............MOSTLY CLOUDY. AT HIGHER ELEVATIONS, A
SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS IN THE EVENING.
* MIN TEMPERATURE........64-69 LOWER ELEVATIONS...EXCEPT 54-61
HIGHER ELEVATIONS.
* 24 HR TREND..........6 DEGREES COOLER.
* MAX HUMIDITY...........60-70 PERCENT.
* 24 HR TREND..........25 PERCENT UP.
* 20-FOOT WINDS..........
* VALLEYS/LWR SLOPES...SOUTH WINDS 4 TO 9 MPH IN THE EVENING
BECOMING DRAINAGE UP TO 5 MPH.
* RIDGES/UPR SLOPES....SOUTHWEST WINDS UP TO 8 MPH SHIFTING TO THE
NORTHEAST UP TO 7 MPH AFTER MIDNIGHT.
* CWR....................10 PERCENT.
* MIXING HEIGHT..........600 FT AGL.
* CHANCE OF THUNDER......16 PERCENT.
FRIDAY
* SKY/WEATHER............MOSTLY CLOUDY. A SLIGHT CHANCE OF SHOWERS
IN THE MORNING, THEN A CHANCE OF SHOWERS IN THE AFTERNOON. A
SLIGHT CHANCE OF THUNDERSTORMS LATE IN THE AFTERNOON.
* MAX TEMPERATURE........78-83 LOWER ELEVATIONS...EXCEPT 63-73
HIGHER ELEVATIONS.
* MIN HUMIDITY...........53-68 PERCENT.
* 20-FOOT WINDS..........
* VALLEYS/LWR SLOPES...NORTH WINDS UP TO 7 MPH SHIFTING TO THE
SOUTHEAST IN THE AFTERNOON.
* RIDGES/UPR SLOPES....NORTHEAST WINDS UP TO 8 MPH.
* MIXING HEIGHT..........2900 FT AGL.
* CWR....................10 PERCENT.
* CHANCE OF THUNDER......14 PERCENT.
CAZ266-190000-
NORTHERN SIERRA FOOTHILLS FROM 1000 TO 3000 FT. INCLUDES PORTIONS
OF SHASTA-TRINITY AND BUTTE UNITS-
1230 AM PDT THU SEP 18 2025
TODAY
* SKY/WEATHER............MOSTLY CLOUDY.
* MAX TEMPERATURE........89-94 LOWER ELEVATIONS...EXCEPT 84-90
HIGHER ELEVATIONS.
* 24 HR TREND..........LITTLE CHANGE.
* MIN HUMIDITY...........21-28 PERCENT.
* 24 HR TREND..........5 PERCENT UP.
* 20-FOOT WINDS..........
* VALLEYS/LWR SLOPES...EAST WINDS 6 TO 12 MPH SHIFTING TO THE SOUTH
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.
* CWR....................0 PERCENT.
* MIXING HEIGHT..........4800 FT AGL.
* CHANCE OF THUNDER......6 PERCENT.
TONIGHT
* SKY/WEATHER............MOSTLY CLOUDY. A SLIGHT CHANCE OF SHOWERS
AFTER MIDNIGHT.
* MIN TEMPERATURE........61-66.
* 24 HR TREND..........5 DEGREES COOLER.
* MAX HUMIDITY...........61-74 PERCENT.
* 24 HR TREND..........33 PERCENT UP.
* 20-FOOT WINDS..........
* VALLEYS/LWR SLOPES...SOUTHEAST WINDS UP TO 8 MPH.
* RIDGES/UPR SLOPES....SOUTHEAST WINDS UP TO 8 MPH IN THE EVENING
BECOMING VARIABLE UP TO 5 MPH.
* CWR....................10 PERCENT.
* MIXING HEIGHT..........600 FT AGL.
* CHANCE OF THUNDER......6 PERCENT.
FRIDAY
* SKY/WEATHER............MOSTLY CLOUDY WITH A SLIGHT CHANCE OF
SHOWERS.
* MAX TEMPERATURE........74-79 LOWER ELEVATIONS...EXCEPT 69-75
HIGHER ELEVATIONS.
* MIN HUMIDITY...........56-71 PERCENT.
* 20-FOOT WINDS..........
* VALLEYS/LWR SLOPES...NORTHEAST WINDS UP TO 7 MPH SHIFTING TO THE
SOUTHWEST IN THE AFTERNOON.
* RIDGES/UPR SLOPES....VARIABLE WINDS UP TO 7 MPH.
* MIXING HEIGHT..........2800 FT AGL.
* CWR....................10 PERCENT.
* CHANCE OF THUNDER......12 PERCENT.
CAZ220-267-190000-
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 THU SEP 18 2025
TODAY
* SKY/WEATHER............MOSTLY CLOUDY.
* MAX TEMPERATURE........84-89.
* 24 HR TREND..........6 DEGREES COOLER.
* MIN HUMIDITY...........27-33 PERCENT.
* 24 HR TREND..........12 PERCENT UP.
* 20-FOOT WINDS..........
* VALLEYS/LWR SLOPES...SOUTH WINDS UP TO 8 MPH.
* RIDGES/UPR SLOPES....SOUTH WINDS UP TO 8 MPH.
* CWR....................0 PERCENT.
* MIXING HEIGHT..........4600 FT AGL.
* CHANCE OF THUNDER......2 PERCENT.
TONIGHT
* SKY/WEATHER............MOSTLY CLOUDY. A SLIGHT CHANCE OF SHOWERS
IN THE EVENING, THEN A CHANCE OF SHOWERS AFTER MIDNIGHT.
* MIN TEMPERATURE........60-65.
* 24 HR TREND..........5 DEGREES COOLER.
* MAX HUMIDITY...........82-97 PERCENT.
* 24 HR TREND..........46 PERCENT UP.
* 20-FOOT WINDS..........
* VALLEYS/LWR SLOPES...DRAINAGE WINDS UP TO 5 MPH.
* RIDGES/UPR SLOPES....SOUTHEAST WINDS UP TO 7 MPH IN THE EVENING
BECOMING VARIABLE UP TO 5 MPH.
* CWR....................20 PERCENT.
* MIXING HEIGHT..........500 FT AGL.
* CHANCE OF THUNDER......7 PERCENT.
FRIDAY
* SKY/WEATHER............MOSTLY CLOUDY WITH A CHANCE OF SHOWERS.
* MAX TEMPERATURE........70-76.
* MIN HUMIDITY...........64-79 PERCENT.
* 20-FOOT WINDS..........
* VALLEYS/LWR SLOPES...UPSLOPE WINDS UP TO 5 MPH BECOMING SOUTHWEST
UP TO 7 MPH IN THE AFTERNOON.
* RIDGES/UPR SLOPES....VARIABLE WINDS UP TO 7 MPH BECOMING
SOUTHWEST UP TO 7 MPH IN THE AFTERNOON.
* MIXING HEIGHT..........2200 FT AGL.
* CWR....................30 PERCENT.
* CHANCE OF THUNDER......11 PERCENT.
CAZ268-190000-
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 THU SEP 18 2025
TODAY
* SKY/WEATHER............MOSTLY CLOUDY.
* MAX TEMPERATURE........79-86 LOWER ELEVATIONS...EXCEPT 73-81
HIGHER ELEVATIONS.
* 24 HR TREND..........LITTLE CHANGE.
* MIN HUMIDITY...........18-25 PERCENT.
* 24 HR TREND..........LITTLE CHANGE.
* 20-FOOT WINDS..........
* VALLEYS/LWR SLOPES...EAST WINDS 4 TO 10 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 UP TO 8 MPH IN THE AFTERNOON.
* CWR....................0 PERCENT.
* MIXING HEIGHT..........6000 FT AGL.
* CHANCE OF THUNDER......5 PERCENT.
TONIGHT
* SKY/WEATHER............MOSTLY CLOUDY. A SLIGHT CHANCE OF SHOWERS
AFTER MIDNIGHT.
* MIN TEMPERATURE........48-57.
* 24 HR TREND..........4 DEGREES COOLER.
* MAX HUMIDITY...........67-82 PERCENT...EXCEPT 79-94 PERCENT IN
THE HIGH MOUNTAIN VALLEYS.
* 24 HR TREND..........33 PERCENT UP.
* 20-FOOT WINDS..........
* VALLEYS/LWR SLOPES...SOUTH WINDS UP TO 8 MPH IN THE EVENING
BECOMING DRAINAGE UP TO 5 MPH.
* RIDGES/UPR SLOPES....SOUTHWEST WINDS UP TO 8 MPH SHIFTING TO THE
EAST AFTER MIDNIGHT.
* CWR....................10 PERCENT.
* MIXING HEIGHT..........500 FT AGL.
* CHANCE OF THUNDER......5 PERCENT.
FRIDAY
* SKY/WEATHER............MOSTLY CLOUDY. A CHANCE OF SHOWERS UNTIL
LATE AFTERNOON, THEN A CHANCE OF SHOWERS AND A SLIGHT CHANCE OF
THUNDERSTORMS LATE IN THE AFTERNOON.
* MAX TEMPERATURE........64-70 LOWER ELEVATIONS...EXCEPT 59-65
HIGHER ELEVATIONS.
* MIN HUMIDITY...........59-74 PERCENT.
* 20-FOOT WINDS..........
* VALLEYS/LWR SLOPES...UPSLOPE WINDS UP TO 5 MPH BECOMING SOUTHWEST
UP TO 7 MPH IN THE AFTERNOON.
* RIDGES/UPR SLOPES....EAST WINDS UP TO 7 MPH SHIFTING TO THE
SOUTHWEST IN THE AFTERNOON.
* MIXING HEIGHT..........2400 FT AGL.
* CWR....................20 PERCENT.
* CHANCE OF THUNDER......15 PERCENT.
CAZ221-269-190000-
STANISLAUS NF WEST OF THE SIERRA CREST-
NORTHERN SIERRA INCLUDING THE TAHOE AND ELDORADO NF/S WEST OF THE
SIERRA CREST-
1230 AM PDT THU SEP 18 2025
TODAY
* SKY/WEATHER............MOSTLY CLOUDY. AT HIGHER ELEVATIONS, A
SLIGHT CHANCE OF SHOWERS IN THE AFTERNOON.
* MAX TEMPERATURE........81-87 LOWER ELEVATIONS...EXCEPT 69-79
HIGHER ELEVATIONS.
* 24 HR TREND..........4 DEGREES COOLER.
* MIN HUMIDITY...........22-30 PERCENT.
* 24 HR TREND..........LITTLE CHANGE.
* 20-FOOT WINDS..........
* VALLEYS/LWR SLOPES...SOUTH WINDS 4 TO 9 MPH.
* RIDGES/UPR SLOPES....SOUTH WINDS 4 TO 9 MPH.
* CWR....................0 PERCENT.
* MIXING HEIGHT..........5000 FT AGL.
* CHANCE OF THUNDER......5 PERCENT.
TONIGHT
* SKY/WEATHER............MOSTLY CLOUDY WITH A CHANCE OF SHOWERS.
* MIN TEMPERATURE........53-60 LOWER ELEVATIONS...EXCEPT 43-53
HIGHER ELEVATIONS.
* 24 HR TREND..........6 DEGREES COOLER.
* MAX HUMIDITY...........83-98 PERCENT.
* 24 HR TREND..........51 PERCENT UP.
* 20-FOOT WINDS..........
* VALLEYS/LWR SLOPES...EAST WINDS UP TO 7 MPH.
* RIDGES/UPR SLOPES....EAST WINDS UP TO 7 MPH.
* CWR....................30 PERCENT.
* MIXING HEIGHT..........600 FT AGL.
* CHANCE OF THUNDER......8 PERCENT.
FRIDAY
* SKY/WEATHER............MOSTLY CLOUDY. A CHANCE OF SHOWERS IN THE
MORNING, THEN A CHANCE OF SHOWERS AND A SLIGHT CHANCE OF
THUNDERSTORMS IN THE AFTERNOON.
* MAX TEMPERATURE........65-71 LOWER ELEVATIONS...EXCEPT 53-63
HIGHER ELEVATIONS.
* MIN HUMIDITY...........71-86 PERCENT.
* 20-FOOT WINDS..........
* VALLEYS/LWR SLOPES...UPSLOPE WINDS UP TO 5 MPH BECOMING SOUTHWEST
UP TO 7 MPH IN THE AFTERNOON.
* RIDGES/UPR SLOPES....EAST WINDS UP TO 7 MPH SHIFTING TO THE
SOUTHWEST IN THE AFTERNOON.
* MIXING HEIGHT..........1400 FT AGL.
* CWR....................40 PERCENT.
* CHANCE OF THUNDER......18 PERCENT.
EXTENDED
...SHASTA COUNTY MOUNTAINS AND COASTAL RANGE
FRIDAY NIGHT
MOSTLY CLOUDY WITH A SLIGHT CHANCE OF SHOWERS.
LOWS 51 TO 61. VARIABLE LESS THAN 5 MPH.
SATURDAY
PARTLY CLOUDY WITH A SLIGHT CHANCE OF SHOWERS. HIGHS
71 TO 81. SOUTH WINDS UP TO 10 MPH.
SATURDAY NIGHT
MOSTLY CLEAR. LOWS 51 TO 61. WEST WINDS UP TO
10 MPH.
SUNDAY
SUNNY. HIGHS 73 TO 83. VARIABLE LESS THAN 5 MPH.
SUNDAY NIGHT
CLEAR. LOWS 51 TO 61. NORTHWEST WINDS UP TO
10 MPH.
MONDAY
WARMER, SUNNY. HIGHS 80 TO 90. NORTHEAST WINDS UP TO
10 MPH.
MONDAY NIGHT
CLEAR. LOWS 54 TO 64. VARIABLE LESS THAN 5 MPH.
...NORTHERN SIERRA AND LASSEN PARK
FRIDAY NIGHT
MOSTLY CLOUDY WITH A CHANCE OF SHOWERS. LOWS
49 TO 59. VARIABLE LESS THAN 5 MPH.
SATURDAY
PARTLY CLOUDY WITH A SLIGHT CHANCE OF SHOWERS. HIGHS
71 TO 79. SOUTHWEST WINDS UP TO 10 MPH.
SATURDAY NIGHT
MOSTLY CLEAR. LOWS 49 TO 59. VARIABLE LESS THAN
5 MPH.
SUNDAY
SUNNY. HIGHS 74 TO 83. VARIABLE LESS THAN 5 MPH.
SUNDAY NIGHT
CLEAR. LOWS 51 TO 61. VARIABLE LESS THAN 5 MPH.
MONDAY
WARMER, SUNNY. HIGHS 80 TO 89. EAST WINDS UP TO 10 MPH.
MONDAY NIGHT
MOSTLY CLEAR. LOWS 53 TO 63. VARIABLE LESS THAN
5 MPH.
...SIERRA NEVADA FOOTHILLS
FRIDAY NIGHT
PARTLY CLOUDY WITH A SLIGHT CHANCE OF SHOWERS.
LOWS 58 TO 64. VARIABLE LESS THAN 5 MPH.
SATURDAY
PARTLY CLOUDY WITH A SLIGHT CHANCE OF SHOWERS. HIGHS
79 TO 84. SOUTHWEST WINDS UP TO 10 MPH.
SATURDAY NIGHT
CLEAR. LOWS 59 TO 64. EAST WINDS UP TO 10 MPH.
SUNDAY
SUNNY. HIGHS 81 TO 86. VARIABLE LESS THAN 5 MPH.
SUNDAY NIGHT
CLEAR. LOWS 61 TO 66. VARIABLE LESS THAN 5 MPH.
MONDAY
SUNNY. HIGHS 87 TO 92. VARIABLE LESS THAN 5 MPH.
MONDAY NIGHT
MOSTLY CLEAR. LOWS 63 TO 68. VARIABLE LESS THAN
5 MPH.
...CENTRAL VALLEY AND DELTA
FRIDAY NIGHT
MOSTLY CLEAR. LOWS 61 TO 66. WEST WINDS 5 TO
15 MPH.
SATURDAY
MOSTLY SUNNY. HIGHS 86 TO 91. WEST WINDS 5 TO 15 MPH.
SATURDAY NIGHT
CLEAR. LOWS 61 TO 66. SOUTHWEST WINDS 5 TO
15 MPH.
SUNDAY
SUNNY. HIGHS 88 TO 93. NORTHWEST WINDS UP TO 10 MPH.
SUNDAY NIGHT
CLEAR. LOWS 62 TO 67. VARIABLE LESS THAN 5 MPH.
MONDAY
SUNNY. HIGHS 93 TO 98. NORTHWEST WINDS UP TO 10 MPH.
MONDAY NIGHT
MOSTLY CLEAR. LOWS 63 TO 68. VARIABLE LESS THAN
5 MPH.
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