502
FNUS56 KSTO 231303
FWFSTO
FIRE WEATHER PLANNING FORECAST FOR INTERIOR NORTHERN CALIFORNIA
NATIONAL WEATHER SERVICE SACRAMENTO CA
502 AM PST TUE DEC 23 2025
DISCUSSION
LINGERING LIGHT TO MODERATE RAIN AND BREEZY WINDS CONTINUE
THROUGH EARLY TUESDAY MORNING WITH LESS WIDESPREAD COVERAGE OF
RAIN THROUGH TUESDAY AFTERNOON. WIDESPREAD HEAVY PRECIPITATION
THEN RETURNS TUESDAY EVENING THROUGH FRIDAY ALONG WITH GUSTY SOUTH
WINDS AS WELL. SNOW LEVELS AROUND 7000 TO 8000 FEET THROUGH
TUESDAY THEN FALL TO AROUND 4500 FEET IN THE SIERRA AND 3500 FEET
FOR SHASTA COUNTY MOUNTAINS AND COAST RANGE MID TO LATE WEEK.
HEAVIEST PRECIPITATION AND STRONGEST WINDS EXPECTED WEDNESDAY AND
THURSDAY. LINGERING SHOWERS REMAIN POSSIBLE SATURDAY WITH
CONDITIONS SLOWLY CLEARING THROUGH THE WEEKEND.
CAZ213-240100-
EASTERN PORTION OF SHASTA-TRINITY NF-
502 AM PST TUE DEC 23 2025
TODAY
* SKY/WEATHER............AT LOWER ELEVATIONS, PATCHY FOG IN THE
MORNING. RAIN.
* MAX TEMPERATURE........52-57 LOWER ELEVATIONS...EXCEPT 45-51
HIGHER ELEVATIONS.
* 24 HR TREND..........LITTLE CHANGE.
* MIN HUMIDITY...........85-97 PERCENT.
* 24 HR TREND..........6 PERCENT UP.
* 20-FOOT WINDS..........
* VALLEYS/LWR SLOPES...NORTHEAST WINDS 5 TO 11 MPH. LOCAL GUSTS UP
TO 30 MPH IN THE AFTERNOON.
* RIDGES/UPR SLOPES....NORTH WINDS UP TO 8 MPH WITH LOCAL GUSTS UP
TO 20 MPH SHIFTING TO THE SOUTH 10 TO 16 MPH WITH LOCAL GUSTS
UP TO 35 MPH IN THE AFTERNOON.
* CWR....................80 PERCENT.
* MIXING HEIGHT..........2600 FT AGL.
* CHANCE OF THUNDER......7 PERCENT.
TONIGHT
* SKY/WEATHER............RAIN.
* MIN TEMPERATURE........45-50 LOWER ELEVATIONS...EXCEPT 37-43
HIGHER ELEVATIONS.
* 24 HR TREND..........LITTLE CHANGE.
* MAX HUMIDITY...........95-100 PERCENT.
* 24 HR TREND..........LITTLE CHANGE.
* 20-FOOT WINDS..........
* VALLEYS/LWR SLOPES...BREEZY. SOUTH WINDS 16 TO 28 MPH WITH LOCAL
GUSTS UP TO 50 MPH.
* RIDGES/UPR SLOPES....BREEZY. SOUTH WINDS 16 TO 28 MPH WITH LOCAL
GUSTS UP TO 55 MPH.
* CWR....................90 PERCENT.
* MIXING HEIGHT..........1800 FT AGL.
* CHANCE OF THUNDER......12 PERCENT.
WEDNESDAY
* SKY/WEATHER............RAIN.
* MAX TEMPERATURE........51-56 LOWER ELEVATIONS...EXCEPT 43-49
HIGHER ELEVATIONS.
* MIN HUMIDITY...........80-95 PERCENT.
* 20-FOOT WINDS..........
* VALLEYS/LWR SLOPES...SOUTH WINDS 10 TO 16 MPH. LOCAL GUSTS UP TO
40 MPH DECREASING TO 25 MPH IN THE AFTERNOON.
* RIDGES/UPR SLOPES....BREEZY. SOUTH WINDS 15 TO 27 MPH WITH LOCAL
GUSTS UP TO 45 MPH DECREASING TO 9 TO 15 MPH WITH LOCAL GUSTS
UP TO 25 MPH IN THE AFTERNOON.
* MIXING HEIGHT..........2000 FT AGL.
* CWR....................70 PERCENT.
* CHANCE OF THUNDER......8 PERCENT.
CAZ214-240100-
BURNEY BASIN AND NORTHEAST PLATEAU IN SHASTA COUNTY INCLUDING
NORTHWEST LASSEN NF NORTH OF LASSEN NP-
502 AM PST TUE DEC 23 2025
TODAY
* SKY/WEATHER............A CHANCE OF RAIN IN THE MORNING, THEN RAIN
LIKELY IN THE AFTERNOON.
* MAX TEMPERATURE........48-53.
* 24 HR TREND..........LITTLE CHANGE.
* MIN HUMIDITY...........71-81 PERCENT.
* 24 HR TREND..........10 PERCENT DOWN.
* 20-FOOT WINDS..........
* VALLEYS/LWR SLOPES...UPSLOPE WINDS UP TO 5 MPH BECOMING WEST 5 TO
11 MPH WITH LOCAL GUSTS UP TO 30 MPH IN THE AFTERNOON.
* RIDGES/UPR SLOPES....SOUTH WINDS 8 TO 14 MPH. LOCAL GUSTS UP TO
30 MPH INCREASING TO 45 MPH IN THE AFTERNOON.
* CWR....................10 PERCENT.
* MIXING HEIGHT..........3600 FT AGL.
* CHANCE OF THUNDER......4 PERCENT.
TONIGHT
* SKY/WEATHER............RAIN.
* MIN TEMPERATURE........36-41.
* 24 HR TREND..........LITTLE CHANGE.
* MAX HUMIDITY...........92-100 PERCENT.
* 24 HR TREND..........5 PERCENT DOWN.
* 20-FOOT WINDS..........
* VALLEYS/LWR SLOPES...SOUTHEAST WINDS 14 TO 26 MPH WITH LOCAL
GUSTS UP TO 35 MPH.
* RIDGES/UPR SLOPES....WINDY. SOUTH WINDS 15 TO 27 MPH WITH LOCAL
GUSTS UP TO 50 MPH.
* CWR....................50 PERCENT.
* MIXING HEIGHT..........1200 FT AGL.
* CHANCE OF THUNDER......10 PERCENT.
WEDNESDAY
* SKY/WEATHER............AT LOWER ELEVATIONS, RAIN. AT HIGHER
ELEVATIONS, RAIN UNTIL LATE AFTERNOON, THEN RAIN AND SNOW LATE IN
THE AFTERNOON.
* MAX TEMPERATURE........47-52 LOWER ELEVATIONS...EXCEPT 42-47
HIGHER ELEVATIONS.
* MIN HUMIDITY...........69-84 PERCENT.
* 20-FOOT WINDS..........
* VALLEYS/LWR SLOPES...SOUTH WINDS 8 TO 14 MPH WITH LOCAL GUSTS UP
TO 30 MPH.
* RIDGES/UPR SLOPES....BREEZY. SOUTH WINDS 15 TO 27 MPH DECREASING
TO 9 TO 15 MPH IN THE AFTERNOON. LOCAL GUSTS UP TO 40 MPH.
* MIXING HEIGHT..........3100 FT AGL.
* CWR....................40 PERCENT.
* CHANCE OF THUNDER......7 PERCENT.
CAZ215-240100-
NORTHERN SACRAMENTO VALLEY TO SOUTHERN TEHAMA COUNTY LINE BELOW
1000 FT-
502 AM PST TUE DEC 23 2025
...HIGH WIND WARNING IN EFFECT FROM 4 PM THIS AFTERNOON TO 4 PM
PST THURSDAY...
TODAY
* SKY/WEATHER............PATCHY FOG IN THE MORNING. RAIN LIKELY IN
THE MORNING, THEN A CHANCE OF RAIN IN THE AFTERNOON.
* MAX TEMPERATURE........53-58.
* 24 HR TREND..........LITTLE CHANGE.
* MIN HUMIDITY...........92-100 PERCENT.
* 24 HR TREND..........LITTLE CHANGE.
* 20-FOOT WINDS..........NORTHEAST WINDS 5 TO 11 MPH WITH LOCAL
GUSTS UP TO 25 MPH SHIFTING TO THE SOUTHEAST 10 TO 16 MPH WITH
LOCAL GUSTS UP TO 40 MPH IN THE AFTERNOON.
* CWR....................40 PERCENT.
* MIXING HEIGHT..........3000 FT AGL.
* CHANCE OF THUNDER......11 PERCENT.
TONIGHT
* SKY/WEATHER............RAIN.
* MIN TEMPERATURE........47-52.
* 24 HR TREND..........LITTLE CHANGE.
* MAX HUMIDITY...........95-100 PERCENT.
* 24 HR TREND..........LITTLE CHANGE.
* 20-FOOT WINDS..........BREEZY. SOUTHEAST WINDS 17 TO 29 MPH WITH
LOCAL GUSTS UP TO 55 MPH.
* CWR....................90 PERCENT.
* MIXING HEIGHT..........1300 FT AGL.
* CHANCE OF THUNDER......10 PERCENT.
WEDNESDAY
* SKY/WEATHER............RAIN.
* MAX TEMPERATURE........52-57.
* MIN HUMIDITY...........87-100 PERCENT.
* 20-FOOT WINDS..........SOUTH WINDS 14 TO 20 MPH WITH LOCAL GUSTS
UP TO 40 MPH.
* MIXING HEIGHT..........3300 FT AGL.
* CWR....................20 PERCENT.
* CHANCE OF THUNDER......10 PERCENT.
CAZ216-240100-
CENTRAL SACRAMENTO VALLEY IN GLENN, COLUSA, YUBA, NORTHERN
SUTTER, AND BUTTE COUNTY BELOW 1000 FT-
502 AM PST TUE DEC 23 2025
...HIGH WIND WARNING IN EFFECT FROM 4 PM THIS AFTERNOON TO 4 PM
PST THURSDAY...
TODAY
* SKY/WEATHER............PATCHY FOG IN THE MORNING. MOSTLY CLOUDY
WITH A CHANCE OF RAIN.
* MAX TEMPERATURE........55-60.
* 24 HR TREND..........LITTLE CHANGE.
* MIN HUMIDITY...........85-100 PERCENT.
* 24 HR TREND..........4 PERCENT DOWN.
* 20-FOOT WINDS..........SOUTHEAST WINDS 9 TO 15 MPH. LOCAL GUSTS
UP TO 25 MPH INCREASING TO 35 MPH IN THE AFTERNOON.
* CWR....................10 PERCENT.
* MIXING HEIGHT..........3300 FT AGL.
* CHANCE OF THUNDER......10 PERCENT.
TONIGHT
* SKY/WEATHER............RAIN.
* MIN TEMPERATURE........45-53.
* 24 HR TREND..........LITTLE CHANGE.
* MAX HUMIDITY...........95-100 PERCENT.
* 24 HR TREND..........LITTLE CHANGE.
* 20-FOOT WINDS..........WINDY. SOUTHEAST WINDS 19 TO 31 MPH WITH
LOCAL GUSTS UP TO 50 MPH.
* CWR....................70 PERCENT.
* MIXING HEIGHT..........1300 FT AGL.
* CHANCE OF THUNDER......11 PERCENT.
WEDNESDAY
* SKY/WEATHER............RAIN UNTIL LATE AFTERNOON, THEN RAIN
SHOWERS AND A SLIGHT CHANCE OF THUNDERSTORMS LATE IN THE
AFTERNOON.
* MAX TEMPERATURE........53-58.
* MIN HUMIDITY...........80-95 PERCENT.
* 20-FOOT WINDS..........SOUTHEAST WINDS 14 TO 20 MPH WITH LOCAL
GUSTS UP TO 35 MPH.
* MIXING HEIGHT..........3100 FT AGL.
* CWR....................20 PERCENT.
* CHANCE OF THUNDER......17 PERCENT.
CAZ217-240100-
SOUTHERN SACRAMENTO VALLEY IN YOLO-
SACRAMENTO FAR WESTERN PLACER, SOUTHERN SUTTER AND SOLANO COUNTY
BELOW 1000 FT-
502 AM PST TUE DEC 23 2025
...HIGH WIND WARNING IN EFFECT FROM 4 PM THIS AFTERNOON TO 4 PM
PST THURSDAY...
TODAY
* SKY/WEATHER............AREAS OF FOG IN THE MORNING. MOSTLY CLOUDY
WITH A SLIGHT CHANCE OF RAIN.
* MAX TEMPERATURE........59-64.
* 24 HR TREND..........LITTLE CHANGE.
* MIN HUMIDITY...........76-88 PERCENT.
* 24 HR TREND..........18 PERCENT DOWN.
* 20-FOOT WINDS..........SOUTHEAST WINDS 9 TO 15 MPH. LOCAL GUSTS
UP TO 25 MPH INCREASING TO 35 MPH IN THE AFTERNOON.
* CWR....................10 PERCENT.
* MIXING HEIGHT..........3400 FT AGL.
* CHANCE OF THUNDER......5 PERCENT.
TONIGHT
* SKY/WEATHER............A CHANCE OF RAIN IN THE EVENING, THEN RAIN
AFTER MIDNIGHT.
* MIN TEMPERATURE........50-55.
* 24 HR TREND..........LITTLE CHANGE.
* MAX HUMIDITY...........95-100 PERCENT.
* 24 HR TREND..........LITTLE CHANGE.
* 20-FOOT WINDS..........WINDY. SOUTHEAST WINDS 18 TO 30 MPH WITH
LOCAL GUSTS UP TO 50 MPH.
* CWR....................60 PERCENT.
* MIXING HEIGHT..........3200 FT AGL.
* CHANCE OF THUNDER......8 PERCENT.
WEDNESDAY
* SKY/WEATHER............RAIN UNTIL LATE AFTERNOON, THEN SHOWERS
AND A SLIGHT CHANCE OF THUNDERSTORMS LATE IN THE AFTERNOON.
* MAX TEMPERATURE........55-60.
* MIN HUMIDITY...........80-95 PERCENT.
* 20-FOOT WINDS..........SOUTH WINDS 12 TO 18 MPH WITH LOCAL GUSTS
UP TO 30 MPH.
* MIXING HEIGHT..........2500 FT AGL.
* CWR....................40 PERCENT.
* CHANCE OF THUNDER......22 PERCENT.
CAZ218-240100-
CARQUINEZ STRAIT AND DELTA-
502 AM PST TUE DEC 23 2025
...HIGH WIND WARNING IN EFFECT FROM 4 PM THIS AFTERNOON TO 4 PM
PST THURSDAY...
TODAY
* SKY/WEATHER............MOSTLY CLOUDY. AREAS OF FOG IN THE
MORNING. A CHANCE OF RAIN IN THE AFTERNOON.
* MAX TEMPERATURE........59-64.
* 24 HR TREND..........LITTLE CHANGE.
* MIN HUMIDITY...........75-85 PERCENT.
* 24 HR TREND..........18 PERCENT DOWN.
* 20-FOOT WINDS..........SOUTHEAST WINDS 10 TO 16 MPH. LOCAL GUSTS
UP TO 25 MPH INCREASING TO 35 MPH IN THE AFTERNOON.
* CWR....................0 PERCENT.
* MIXING HEIGHT..........3200 FT AGL.
* CHANCE OF THUNDER......4 PERCENT.
TONIGHT
* SKY/WEATHER............RAIN.
* MIN TEMPERATURE........52-57.
* 24 HR TREND..........LITTLE CHANGE.
* MAX HUMIDITY...........91-96 PERCENT.
* 24 HR TREND..........7 PERCENT DOWN.
* 20-FOOT WINDS..........WINDY. SOUTHEAST WINDS 22 TO 34 MPH WITH
LOCAL GUSTS UP TO 55 MPH.
* CWR....................50 PERCENT.
* MIXING HEIGHT..........3500 FT AGL.
* CHANCE OF THUNDER......10 PERCENT.
WEDNESDAY
* SKY/WEATHER............RAIN UNTIL LATE AFTERNOON, THEN SHOWERS
AND A SLIGHT CHANCE OF THUNDERSTORMS LATE IN THE AFTERNOON.
* MAX TEMPERATURE........57-62.
* MIN HUMIDITY...........84-94 PERCENT.
* 20-FOOT WINDS..........SOUTH WINDS 14 TO 20 MPH. LOCAL GUSTS UP
TO 40 MPH DECREASING TO 30 MPH IN THE AFTERNOON.
* MIXING HEIGHT..........2000 FT AGL.
* CWR....................20 PERCENT.
* CHANCE OF THUNDER......21 PERCENT.
CAZ219-240100-
NORTHERN SAN JOAQUIN VALLEY IN SAN JOAQUIN AND STANISLAUS
COUNTIES BELOW 1000 FT-
502 AM PST TUE DEC 23 2025
...HIGH WIND WARNING IN EFFECT FROM 4 PM THIS AFTERNOON TO 4 PM
PST THURSDAY...
TODAY
* SKY/WEATHER............MOSTLY CLOUDY. AREAS OF FOG IN THE
MORNING. A SLIGHT CHANCE OF RAIN IN THE AFTERNOON.
* MAX TEMPERATURE........60-65.
* 24 HR TREND..........LITTLE CHANGE.
* MIN HUMIDITY...........69-75 PERCENT.
* 24 HR TREND..........19 PERCENT DOWN.
* 20-FOOT WINDS..........BREEZY. SOUTHEAST WINDS 9 TO 15 MPH WITH
LOCAL GUSTS UP TO 30 MPH INCREASING TO 15 TO 27 MPH WITH LOCAL
GUSTS UP TO 45 MPH IN THE AFTERNOON.
* CWR....................0 PERCENT.
* MIXING HEIGHT..........3700 FT AGL.
* CHANCE OF THUNDER......2 PERCENT.
TONIGHT
* SKY/WEATHER............A CHANCE OF RAIN IN THE EVENING, THEN RAIN
AFTER MIDNIGHT.
* MIN TEMPERATURE........51-56.
* 24 HR TREND..........LITTLE CHANGE.
* MAX HUMIDITY...........95-100 PERCENT.
* 24 HR TREND..........LITTLE CHANGE.
* 20-FOOT WINDS..........WINDY. SOUTHEAST WINDS 24 TO 36 MPH WITH
LOCAL GUSTS UP TO 50 MPH.
* CWR....................60 PERCENT.
* MIXING HEIGHT..........3200 FT AGL.
* CHANCE OF THUNDER......8 PERCENT.
WEDNESDAY
* SKY/WEATHER............RAIN IN THE MORNING, THEN SHOWERS AND A
SLIGHT CHANCE OF THUNDERSTORMS IN THE AFTERNOON.
* MAX TEMPERATURE........55-60.
* MIN HUMIDITY...........76-91 PERCENT.
* 20-FOOT WINDS..........SOUTH WINDS 14 TO 20 MPH WITH LOCAL GUSTS
UP TO 35 MPH.
* MIXING HEIGHT..........2300 FT AGL.
* CWR....................70 PERCENT.
* CHANCE OF THUNDER......19 PERCENT.
CAZ263-279-240100-
SOUTHEAST EDGE SHASTA-TRINITY NF AND WESTERN PORTIONS OF TEHAMA-
GLENN UNIT-EASTERN MENDOCINO NF-
502 AM PST TUE DEC 23 2025
TODAY
* SKY/WEATHER............AT LOWER ELEVATIONS, PATCHY FOG IN THE
MORNING. RAIN.
* MAX TEMPERATURE........52-57 LOWER ELEVATIONS...EXCEPT 43-50
HIGHER ELEVATIONS.
* 24 HR TREND..........LITTLE CHANGE.
* MIN HUMIDITY...........83-94 PERCENT.
* 24 HR TREND..........12 PERCENT UP.
* 20-FOOT WINDS..........
* VALLEYS/LWR SLOPES...SOUTHEAST WINDS 12 TO 18 MPH. LOCAL GUSTS UP
TO 20 MPH INCREASING TO 35 MPH IN THE AFTERNOON.
* RIDGES/UPR SLOPES....SOUTHEAST WINDS 13 TO 19 MPH. LOCAL GUSTS UP
TO 40 MPH IN THE AFTERNOON.
* CWR....................60 PERCENT.
* MIXING HEIGHT..........2300 FT AGL.
* CHANCE OF THUNDER......10 PERCENT.
TONIGHT
* SKY/WEATHER............RAIN.
* MIN TEMPERATURE........43-48 LOWER ELEVATIONS...EXCEPT 34-42
HIGHER ELEVATIONS.
* 24 HR TREND..........LITTLE CHANGE.
* MAX HUMIDITY...........87-100 PERCENT.
* 24 HR TREND..........4 PERCENT DOWN.
* 20-FOOT WINDS..........
* VALLEYS/LWR SLOPES...BREEZY. SOUTHEAST WINDS 19 TO 31 MPH WITH
LOCAL GUSTS UP TO 45 MPH.
* RIDGES/UPR SLOPES....WINDY. SOUTH WINDS 19 TO 31 MPH WITH LOCAL
GUSTS UP TO 55 MPH.
* CWR....................100 PERCENT.
* MIXING HEIGHT..........1400 FT AGL.
* CHANCE OF THUNDER......13 PERCENT.
WEDNESDAY
* SKY/WEATHER............AT LOWER ELEVATIONS, RAIN. AT HIGHER
ELEVATIONS, RAIN AND SNOW UNTIL LATE AFTERNOON, THEN RAIN,
SNOW...HEAVY AT TIMES AND A SLIGHT CHANCE OF THUNDERSTORMS LATE
IN THE AFTERNOON.
* MAX TEMPERATURE........51-56 LOWER ELEVATIONS...EXCEPT 41-47
HIGHER ELEVATIONS.
* MIN HUMIDITY...........74-89 PERCENT.
* 20-FOOT WINDS..........
* VALLEYS/LWR SLOPES...SOUTHEAST WINDS 15 TO 21 MPH WITH LOCAL
GUSTS UP TO 30 MPH.
* RIDGES/UPR SLOPES....BREEZY. SOUTHEAST WINDS 15 TO 21 MPH WITH
LOCAL GUSTS UP TO 40 MPH.
* MIXING HEIGHT..........2800 FT AGL.
* CWR....................30 PERCENT.
* CHANCE OF THUNDER......10 PERCENT.
CAZ266-240100-
NORTHERN SIERRA FOOTHILLS FROM 1000 TO 3000 FT. INCLUDES PORTIONS
OF SHASTA-TRINITY AND BUTTE UNITS-
502 AM PST TUE DEC 23 2025
...HIGH WIND WARNING IN EFFECT FROM 4 PM THIS AFTERNOON TO 4 PM
PST THURSDAY...
TODAY
* SKY/WEATHER............AT LOWER ELEVATIONS, PATCHY FOG IN THE
MORNING. RAIN LIKELY IN THE MORNING, THEN A CHANCE OF RAIN IN THE
AFTERNOON.
* MAX TEMPERATURE........53-58.
* 24 HR TREND..........LITTLE CHANGE.
* MIN HUMIDITY...........79-90 PERCENT.
* 24 HR TREND..........10 PERCENT DOWN.
* 20-FOOT WINDS..........
* VALLEYS/LWR SLOPES...SOUTH WINDS 10 TO 16 MPH. LOCAL GUSTS UP TO
25 MPH INCREASING TO 40 MPH IN THE AFTERNOON.
* RIDGES/UPR SLOPES....SOUTH WINDS 10 TO 16 MPH. LOCAL GUSTS UP TO
25 MPH INCREASING TO 40 MPH IN THE AFTERNOON.
* CWR....................30 PERCENT.
* MIXING HEIGHT..........3800 FT AGL.
* CHANCE OF THUNDER......8 PERCENT.
TONIGHT
* SKY/WEATHER............RAIN.
* MIN TEMPERATURE........45-50.
* 24 HR TREND..........LITTLE CHANGE.
* MAX HUMIDITY...........95-100 PERCENT.
* 24 HR TREND..........LITTLE CHANGE.
* 20-FOOT WINDS..........
* VALLEYS/LWR SLOPES...WINDY. SOUTH WINDS 22 TO 34 MPH WITH LOCAL
GUSTS UP TO 60 MPH.
* RIDGES/UPR SLOPES....WINDY. SOUTH WINDS 22 TO 34 MPH WITH LOCAL
GUSTS UP TO 60 MPH.
* CWR....................80 PERCENT.
* MIXING HEIGHT..........1100 FT AGL.
* CHANCE OF THUNDER......10 PERCENT.
WEDNESDAY
* SKY/WEATHER............RAIN.
* MAX TEMPERATURE........49-54.
* MIN HUMIDITY...........78-93 PERCENT.
* 20-FOOT WINDS..........
* VALLEYS/LWR SLOPES...WINDY. SOUTH WINDS 21 TO 33 MPH DECREASING
TO 10 TO 16 MPH IN THE AFTERNOON. LOCAL GUSTS UP TO 45 MPH.
* RIDGES/UPR SLOPES....BREEZY. SOUTH WINDS 17 TO 29 MPH WITH LOCAL
GUSTS UP TO 45 MPH DECREASING TO 7 TO 13 MPH WITH LOCAL GUSTS
UP TO 30 MPH IN THE AFTERNOON.
* MIXING HEIGHT..........2800 FT AGL.
* CWR....................60 PERCENT.
* CHANCE OF THUNDER......10 PERCENT.
CAZ220-267-240100-
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-
502 AM PST TUE DEC 23 2025
...HIGH WIND WARNING IN EFFECT FROM 4 PM THIS AFTERNOON TO 4 PM
PST THURSDAY...
TODAY
* SKY/WEATHER............AT LOWER ELEVATIONS, AREAS OF FOG IN THE
MORNING. MOSTLY CLOUDY WITH A SLIGHT CHANCE OF RAIN.
* MAX TEMPERATURE........56-61.
* 24 HR TREND..........LITTLE CHANGE.
* MIN HUMIDITY...........66-81 PERCENT.
* 24 HR TREND..........21 PERCENT DOWN.
* 20-FOOT WINDS..........
* VALLEYS/LWR SLOPES...SOUTHEAST WINDS 8 TO 14 MPH. LOCAL GUSTS UP
TO 35 MPH IN THE AFTERNOON.
* RIDGES/UPR SLOPES....SOUTHEAST WINDS 8 TO 14 MPH. LOCAL GUSTS UP
TO 35 MPH IN THE AFTERNOON.
* CWR....................10 PERCENT.
* MIXING HEIGHT..........4100 FT AGL.
* CHANCE OF THUNDER......1 PERCENT.
TONIGHT
* SKY/WEATHER............RAIN.
* MIN TEMPERATURE........45-50.
* 24 HR TREND..........LITTLE CHANGE.
* MAX HUMIDITY...........95-100 PERCENT.
* 24 HR TREND..........LITTLE CHANGE.
* 20-FOOT WINDS..........
* VALLEYS/LWR SLOPES...BREEZY. SOUTHEAST WINDS 14 TO 26 MPH WITH
LOCAL GUSTS UP TO 45 MPH.
* RIDGES/UPR SLOPES....BREEZY. SOUTHEAST WINDS 14 TO 26 MPH WITH
LOCAL GUSTS UP TO 45 MPH.
* CWR....................60 PERCENT.
* MIXING HEIGHT..........1500 FT AGL.
* CHANCE OF THUNDER......7 PERCENT.
WEDNESDAY
* SKY/WEATHER............RAIN IN THE MORNING, THEN RAIN SHOWERS AND
A SLIGHT CHANCE OF THUNDERSTORMS IN THE AFTERNOON.
* MAX TEMPERATURE........51-56.
* MIN HUMIDITY...........83-98 PERCENT.
* 20-FOOT WINDS..........
* VALLEYS/LWR SLOPES...SOUTH WINDS 12 TO 18 MPH WITH LOCAL GUSTS UP
TO 35 MPH.
* RIDGES/UPR SLOPES....SOUTH WINDS 12 TO 18 MPH WITH LOCAL GUSTS UP
TO 35 MPH.
* MIXING HEIGHT..........2800 FT AGL.
* CWR....................90 PERCENT.
* CHANCE OF THUNDER......20 PERCENT.
CAZ268-240100-
NORTHERN SIERRA INCLUDING LASSEN NP AND PLUMAS AND LASSEN NF/S
WEST OF THE SIERRA CREST (WEST OF EVANS PEAK-GRIZZLY PEAK-
BECKWORTH PEAK)-
502 AM PST TUE DEC 23 2025
TODAY
* SKY/WEATHER............MOSTLY CLOUDY. AT LOWER ELEVATIONS, A
CHANCE OF RAIN. AT HIGHER ELEVATIONS, A CHANCE OF RAIN AND
SNOW...HEAVY AT TIMES IN THE MORNING, THEN A CHANCE OF RAIN IN
THE AFTERNOON.
* MAX TEMPERATURE........46-51 LOWER ELEVATIONS...EXCEPT 40-46
HIGHER ELEVATIONS.
* 24 HR TREND..........LITTLE CHANGE.
* MIN HUMIDITY...........77-89 PERCENT.
* 24 HR TREND..........8 PERCENT DOWN.
* 20-FOOT WINDS..........
* VALLEYS/LWR SLOPES...SOUTH WINDS 12 TO 18 MPH. LOCAL GUSTS UP TO
30 MPH INCREASING TO 50 MPH IN THE AFTERNOON.
* RIDGES/UPR SLOPES....WINDY. SOUTH WINDS 15 TO 21 MPH INCREASING
TO 18 TO 30 MPH IN THE AFTERNOON. LOCAL GUSTS UP TO 50 MPH.
* CWR....................10 PERCENT.
* MIXING HEIGHT..........4200 FT AGL.
* CHANCE OF THUNDER......2 PERCENT.
TONIGHT
* SKY/WEATHER............RAIN.
* MIN TEMPERATURE........32-40.
* 24 HR TREND..........LITTLE CHANGE.
* MAX HUMIDITY...........94-100 PERCENT.
* 24 HR TREND..........LITTLE CHANGE.
* 20-FOOT WINDS..........
* VALLEYS/LWR SLOPES...WINDY. SOUTH WINDS 25 TO 37 MPH WITH LOCAL
GUSTS UP TO 60 MPH.
* RIDGES/UPR SLOPES....VERY WINDY. SOUTH WINDS 26 TO 38 MPH WITH
LOCAL GUSTS UP TO 65 MPH.
* CWR....................80 PERCENT.
* MIXING HEIGHT..........2300 FT AGL.
* CHANCE OF THUNDER......8 PERCENT.
WEDNESDAY
* SKY/WEATHER............RAIN AT LOWER ELEVATIONS....AND RAIN AND
SNOW AT HIGHER ELEVATIONS. SNOW LEVEL 5500 FEET IN THE AFTERNOON.
* MAX TEMPERATURE........42-47 LOWER ELEVATIONS...EXCEPT 37-43
HIGHER ELEVATIONS.
* MIN HUMIDITY...........74-89 PERCENT.
* 20-FOOT WINDS..........
* VALLEYS/LWR SLOPES...BREEZY. SOUTH WINDS 17 TO 29 MPH WITH LOCAL
GUSTS UP TO 45 MPH DECREASING TO 10 TO 16 MPH WITH LOCAL GUSTS
UP TO 30 MPH IN THE AFTERNOON.
* RIDGES/UPR SLOPES....WINDY. SOUTH WINDS 21 TO 33 MPH WITH LOCAL
GUSTS UP TO 55 MPH DECREASING TO 14 TO 20 MPH WITH LOCAL GUSTS
UP TO 30 MPH IN THE AFTERNOON.
* MIXING HEIGHT..........2600 FT AGL.
* CWR....................70 PERCENT.
* CHANCE OF THUNDER......8 PERCENT.
CAZ221-269-240100-
STANISLAUS NF WEST OF THE SIERRA CREST-
NORTHERN SIERRA INCLUDING THE TAHOE AND ELDORADO NF/S WEST OF THE
SIERRA CREST-
502 AM PST TUE DEC 23 2025
TODAY
* SKY/WEATHER............PARTLY CLOUDY. A SLIGHT CHANCE OF RAIN AT
LOWER ELEVATIONS....AND A SLIGHT CHANCE OF RAIN AND SNOW AT
HIGHER ELEVATIONS.
* MAX TEMPERATURE........51-58 LOWER ELEVATIONS...EXCEPT 41-51
HIGHER ELEVATIONS.
* 24 HR TREND..........4 DEGREES WARMER.
* MIN HUMIDITY...........55-70 PERCENT.
* 24 HR TREND..........11 PERCENT DOWN.
* 20-FOOT WINDS..........
* VALLEYS/LWR SLOPES...SOUTH WINDS 12 TO 18 MPH WITH LOCAL GUSTS UP
TO 35 MPH.
* RIDGES/UPR SLOPES....BREEZY. SOUTH WINDS 15 TO 21 MPH WITH LOCAL
GUSTS UP TO 45 MPH.
* CWR....................10 PERCENT.
* MIXING HEIGHT..........4500 FT AGL.
* CHANCE OF THUNDER......0 PERCENT.
TONIGHT
* SKY/WEATHER............AT LOWER ELEVATIONS, RAIN LIKELY IN THE
EVENING, THEN RAIN...HEAVY AT TIMES AFTER MIDNIGHT. AT HIGHER
ELEVATIONS, A CHANCE OF RAIN AND SNOW...HEAVY AT TIMES IN THE
EVENING, THEN RAIN...HEAVY AT TIMES AND SNOW...HEAVY AT TIMES
AFTER MIDNIGHT.
* MIN TEMPERATURE........39-44 LOWER ELEVATIONS...EXCEPT 29-36
HIGHER ELEVATIONS.
* 24 HR TREND..........LITTLE CHANGE.
* MAX HUMIDITY...........94-100 PERCENT.
* 24 HR TREND..........22 PERCENT UP.
* 20-FOOT WINDS..........
* VALLEYS/LWR SLOPES...BREEZY. SOUTH WINDS 19 TO 31 MPH WITH LOCAL
GUSTS UP TO 45 MPH.
* RIDGES/UPR SLOPES....WINDY. SOUTH WINDS 19 TO 31 MPH WITH LOCAL
GUSTS UP TO 60 MPH.
* CWR....................60 PERCENT.
* MIXING HEIGHT..........2300 FT AGL.
* CHANCE OF THUNDER......5 PERCENT.
WEDNESDAY
* SKY/WEATHER............AT LOWER ELEVATIONS, RAIN...HEAVY AT TIMES
IN THE MORNING, THEN SHOWERS AND A SLIGHT CHANCE OF THUNDERSTORMS
IN THE AFTERNOON. AT HIGHER ELEVATIONS, RAIN...HEAVY AT TIMES AND
SNOW...HEAVY AT TIMES UNTIL LATE AFTERNOON, THEN SHOWERS, HEAVY
SNOW SHOWERS AND A SLIGHT CHANCE OF THUNDERSTORMS LATE IN THE
AFTERNOON. SNOW LEVEL 7000 FEET DECREASING TO 6500 FEET IN THE
AFTERNOON.
* MAX TEMPERATURE........46-51 LOWER ELEVATIONS...EXCEPT 35-43
HIGHER ELEVATIONS.
* MIN HUMIDITY...........75-90 PERCENT.
* 20-FOOT WINDS..........
* VALLEYS/LWR SLOPES...SOUTH WINDS 11 TO 17 MPH WITH LOCAL GUSTS UP
TO 35 MPH.
* RIDGES/UPR SLOPES....WINDY. SOUTH WINDS 18 TO 30 MPH WITH LOCAL
GUSTS UP TO 55 MPH DECREASING TO 16 TO 22 MPH WITH LOCAL GUSTS
UP TO 40 MPH IN THE AFTERNOON.
* MIXING HEIGHT..........3400 FT AGL.
* CWR....................100 PERCENT.
* CHANCE OF THUNDER......16 PERCENT.
EXTENDED
...SHASTA COUNTY MOUNTAINS AND COASTAL RANGE
WEDNESDAY NIGHT
SHOWERS AND A SLIGHT CHANCE OF THUNDERSTORMS.
LOWS 34 TO 41. SOUTHEAST WINDS 20 TO 30 MPH.
CHRISTMAS DAY...RAIN AND SNOW
HEAVY AT TIMES. HIGHS 39 TO 46.
SOUTH WINDS 20 TO 30 MPH.
THURSDAY NIGHT
RAIN AND SNOW. LOWS 29 TO 38. SOUTH WINDS 10 TO
20 MPH.
FRIDAY
RAIN AND SNOW. HIGHS 36 TO 43. SOUTHWEST WINDS 5 TO
15 MPH.
FRIDAY NIGHT
MOSTLY CLOUDY WITH A CHANCE OF RAIN AND SNOW.
LOWS 26 TO 36. WEST WINDS UP TO 10 MPH.
SATURDAY
MOSTLY SUNNY. HIGHS 39 TO 48. NORTH WINDS UP TO
10 MPH.
SATURDAY NIGHT
CLEAR. LOWS 24 TO 34. NORTH WINDS 5 TO 10 MPH.
...NORTHERN SIERRA AND LASSEN PARK
WEDNESDAY NIGHT
SHOWERS AND A SLIGHT CHANCE OF THUNDERSTORMS.
LOWS 33 TO 40. SOUTH WINDS 20 TO 30 MPH.
CHRISTMAS DAY...RAIN
HEAVY AT TIMES AND SNOW. HIGHS 39 TO 47.
SOUTH WINDS 20 TO 30 MPH.
THURSDAY NIGHT
SHOWERS, SNOW AND A SLIGHT CHANCE OF
THUNDERSTORMS. LOWS 29 TO 37. SOUTH WINDS 15 TO 25 MPH.
FRIDAY
RAIN AND SNOW. HIGHS 36 TO 43. SOUTH WINDS 5 TO 10 MPH.
FRIDAY NIGHT
MOSTLY CLOUDY WITH A CHANCE OF RAIN AND SNOW.
LOWS 24 TO 34. VARIABLE LESS THAN 5 MPH.
SATURDAY
PARTLY CLOUDY WITH A SLIGHT CHANCE OF RAIN AND SNOW.
HIGHS 40 TO 49. VARIABLE LESS THAN 5 MPH.
SATURDAY NIGHT
MOSTLY CLEAR. LOWS 23 TO 33. NORTHEAST WINDS
5 TO 10 MPH.
...SIERRA NEVADA FOOTHILLS
WEDNESDAY NIGHT
SHOWERS AND A SLIGHT CHANCE OF THUNDERSTORMS.
LOWS 42 TO 47. SOUTHEAST WINDS 20 TO 30 MPH.
CHRISTMAS DAY
RAIN. HIGHS 47 TO 52. SOUTH WINDS 25 TO 35 MPH.
THURSDAY NIGHT
SHOWERS AND A SLIGHT CHANCE OF THUNDERSTORMS.
LOWS 38 TO 43. SOUTH WINDS 15 TO 25 MPH.
FRIDAY
RAIN. HIGHS 44 TO 49. SOUTH WINDS 5 TO 15 MPH.
FRIDAY NIGHT
MOSTLY CLOUDY WITH A CHANCE OF RAIN. LOWS 34 TO
39. VARIABLE LESS THAN 5 MPH.
SATURDAY
PARTLY CLOUDY WITH A SLIGHT CHANCE OF RAIN. HIGHS
48 TO 53. VARIABLE LESS THAN 5 MPH.
SATURDAY NIGHT
CLEAR. LOWS 33 TO 38. NORTHEAST WINDS 5 TO
10 MPH.
...CENTRAL VALLEY AND DELTA
WEDNESDAY NIGHT
SHOWERS AND A SLIGHT CHANCE OF THUNDERSTORMS.
LOWS 49 TO 54. SOUTHEAST WINDS 20 TO 30 MPH.
CHRISTMAS DAY
SHOWERS AND A SLIGHT CHANCE OF THUNDERSTORMS.
HIGHS 52 TO 57. SOUTH WINDS 20 TO 30 MPH.
THURSDAY NIGHT
SHOWERS AND A SLIGHT CHANCE OF THUNDERSTORMS.
LOWS 45 TO 50. SOUTH WINDS 15 TO 25 MPH.
FRIDAY
RAIN. HIGHS 48 TO 53. SOUTH WINDS 10 TO 15 MPH.
FRIDAY NIGHT
RAIN LIKELY. LOWS 41 TO 46. SOUTHEAST WINDS 5 TO
10 MPH.
SATURDAY
PARTLY CLOUDY. HIGHS 49 TO 54. NORTHWEST WINDS 5 TO
10 MPH.
SATURDAY NIGHT
MOSTLY CLEAR. LOWS 37 TO 42. NORTH WINDS 5 TO
10 MPH.
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