219
FNUS76 KSTO 211711
FWSSTO

Spot Forecast for EBMUD Dike 1 Rx burn...EBMUD/CalFire
National Weather Service Sacramento CA
1011 AM PDT Mon Sep 21 2026

Forecast is based on ignition time of 0900 PDT on September 22.
If conditions become unrepresentative...contact the National Weather
Service.

.DISCUSSION...

Dry weather and clear conditions are forecast for the burn site
at time of ignition. Winds will be diurnally driven, with north
winds overnight transitioning to west-southwest winds during the
day. Afternoon/evening gusts may reach 15 mph at times, but will
generally be around 10 to 13 mph. Mixing heights will be around
300 ft AGL overnight and in the early morning, rising to 1000-1300
ft AGL by the afternoon. Good overnight recovery is expected
early Tuesday morning, with daytime minimum humidities in the low
40s. Temperatures are also on track to gradually warm up heading
into midweek as daytime humidities trend lower.



.TUESDAY...

Sky/weather.........Sunny.
Max temperature.....81-85.
Min humidity........40-44 percent.
Wind (20 ft)........
 Slope/valley.......Light winds becoming west up to 6 mph late in
                    the morning with afternoon/evening gusts around 13 mph.
 Ridgetop...........Northwest around 8 mph shifting to the west around
                    7 mph late in the afternoon.
Mixing height.......Start out around 400 ft AGL, increasing to 1300 ft AGL
in the afternoon.
Transport winds.....West around 7 mph.
CWR.................0 percent.
Chance of thunder...0 percent.

TIME (PDT)      9 AM   11 AM  1 PM   3 PM   5 PM
Sky cover.......MCLEAR CLEAR  CLEAR  CLEAR  CLEAR
CWR.............0      0      0      0      0
Chc of thdr (%).0      0      0      0      0
Temp............61     70     75     81     83
RH..............77     63     53     43     42
SL/VL wind......NW 3   W 5    W 6    W 6    W 5
SL/VL wind gust.7      9      10     13     12
Ridgetop wind...NW 5   W 6    W 6    W 7    NW 7
Mix hgt (ft)....400    800   1000    1300   1000
Transport wind..NW 5   W 6    W 6    W 7    NW 7

.TUESDAY NIGHT...

Sky/weather.........Mostly clear.
Min temperature.....57-61.
Max humidity........74-78 percent.
Wind (20 ft)........
 Slope/valley.......West winds up to 5 mph with gusts to 12 mph early in the evening
                    becoming light.
 Ridgetop...........West around 8 mph shifting to the south
                    overnight.
Mixing height.......Lowering to 300 ft AGL.
Transport winds.....Northwest 5 to 8 mph shifting to the north
                    overnight.
CWR.................0 percent.
Chance of thunder...0 percent.

TIME (PDT)      6 PM   8 PM   10 PM  MIDNGT 2 AM   4 AM
Sky cover.......CLEAR  CLEAR  CLEAR  CLEAR  MCLEAR MCLEAR
CWR.............0      0      0      0      0      0
Chc of thdr (%).0      0      0      0      0      0
Temp............81     76     69     66     63     61
RH..............44     53     63     68     72     75
SL/VL wind......W 5    NW 2   NW 2   N 2    NE 2   NE 2
SL/VL wind gust.12     5      5      5      3      3
Ridgetop wind...NW 7   W 8    W 8    N 5    N 3    N 3
Mix hgt (ft)....1000   400    400    300    400    400
Transport wind..NW 7   W 8    W 8    N 5    N 3    N 3

.WEDNESDAY...

Sky/weather.........Sunny.
Max temperature.....87-91.
Min humidity........29-33 percent.
Wind (20 ft)........
 Slope/valley.......Light winds becoming west up to 6 mph late in
                    the morning with afternoon gusts to 12 mph.
 Ridgetop...........West 8 to 10 mph.
Mixing height.......Increasing to 1500-2000 ft AGL by the afternoon.
Transport winds.....Northwest around 5 mph shifting to the west around
                    8 mph late in the morning.
CWR.................0 percent.
Chance of thunder...0 percent.

TIME (PDT)      6 AM      9 AM      NOON      3 PM
Sky cover.......MCLEAR    CLEAR     CLEAR     CLEAR
CWR.............0         0         0         0
Chc of thdr (%).0         0         0         0
Temp............59        64        79        87
RH..............77        69        46        33
SL/VL wind......N 2G3     N 2G5     W 5G9     W 6G12
Ridgetop wind...NW 5      W 8       W 8       W 10
Mix hgt (ft)....300       400       1200      2000
Transport wind..NW 5      W 8       W 8       W 8

$$
Forecaster...KF
Requested by...Beau Bourland/ John Fredrick
Type of request...PRESCRIBED
.TAG 2622146.0/STO
.DELDT 09/21/26
.FormatterVersion 2.0.0
.EMAIL michael.shoda@fire.ca.gov,bbourlan@ebmud.com,john.fredrick@fire.ca.gov