739
FNUS76 KSTO 222021
FWSSTO
SPOT FORECAST FOR READINESS DRILL...CAL FIRE
NATIONAL WEATHER SERVICE SACRAMENTO CA
121 PM PDT FRI MAY 22 2026
FORECAST IS BASED ON IGNITION TIME OF 1300 PDT ON MAY 26.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.
DISCUSSION
AN UPPER LEVEL TROUGH WILL APPROACH THE REGION EARLY TO MID NEXT
WEEK. IT IS CURRENTLY PROJECTED TO DROP DOWN FROM THE NORTH ON
TUESDAY, BRINGING ALONG COOLER TEMPERATURES AND INCREASED ONSHORE
FLOW. THERE IS ALSO THE POTENTIAL FOR LIGHT SHOWERS WITH THIS BUT
CONFIDENCE IS LOW FOR THE BURN LOCATION (20% CHANCE OF AT LEAST
0.01" RAIN). INCREASED NORTHERLY FLOW WILL THEN MOVE IN BEHIND
IT ON WEDNESDAY, ALONG WITH DRIER CONDITIONS.
TUESDAY
SKY/WEATHER.........PARTLY TO MOSTLY SUNNY.
MAX TEMPERATURE.....70-74.
MIN HUMIDITY........26-30 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......WEST WINDS 5 TO 6 MPH WITH GUSTS 10 TO 15 MPH.
RIDGETOP...........WEST 7 TO 10 MPH WITH GUSTS 12 TO 17 MPH.
MIXING HEIGHT.......INCREASING TO 7100 FT AGL.
TRANSPORT WINDS.....SOUTHWEST 7 TO 8 MPH SHIFTING TO THE WEST
AROUND 10 MPH LATE IN THE AFTERNOON.
CWR.................LESS THAN 5 PERCENT.
CHANCE OF THUNDER...10 PERCENT.
TIME (PDT) 1PM 2PM 3PM 4PM 5PM
SKY COVER.......PCR PCR MCR MCR MCR
CWR.............0 0 0 0 0
CHC OF THDR (%).0 0 0 0 10
TEMP............68 70 71 71 71
RH..............46 39 33 29 28
SL/VL WIND DIR..SW W W W W
SL/VL WIND SPD..5 6 6 6 6
SL/VL WIND GUST.10 13 13 13 13
RIDGE WIND DIR..W W W W W
RIDGE WIND SPD..7 8 8 8 10
MIX HGT (KFT)...2.9 5.4 5.4 5.4 7.1
TRANSP WIND DIR.S SW SW SW W
TRANSP WIND SPD.7 8 8 8 10
TUESDAY NIGHT
SKY/WEATHER.........MOSTLY CLEAR.
MIN TEMPERATURE.....52-56.
MAX HUMIDITY........51-55 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......WEST WINDS 5 TO 6 MPH EARLY IN THE EVENING
BECOMING LIGHT, THEN BECOMING NORTH 3 TO 6 MPH
EARLY IN THE MORNING.
RIDGETOP...........WEST AROUND 10 MPH SHIFTING TO THE NORTHEAST 6
TO 7 MPH OVERNIGHT.
MIXING HEIGHT.......DECREASING TO 400 FT AGL.
TRANSPORT WINDS.....WEST AROUND 10 MPH SHIFTING TO THE NORTHEAST 6
TO 7 MPH EARLY IN THE EVENING.
CWR.................LESS THAN 5 PERCENT.
CHANCE OF THUNDER...10 PERCENT.
TIME (PDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY COVER.......MCR MCR MCR MCR MCR CLR CLR CLR CLR CLR CLR MCR
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
CHC OF THDR (%).10 10 10 10 10 0 0 0 0 0 0 0
TEMP............71 70 68 65 63 60 59 58 57 56 55 55
RH..............30 34 38 41 44 47 49 50 51 53 53 53
SL/VL WIND DIR..W W NW NW NW N N N NE NE NE N
SL/VL WIND SPD..6 6 3 3 3 3 3 3 3 3 3 5
SL/VL WIND GUST.13 13 9 9 9 7 7 7 8 8 8 10
RIDGE WIND DIR..W W NW NW N N N N N N N N
RIDGE WIND SPD..10 10 6 6 6 7 7 7 7 7 7 7
MIX HGT (KFT)...7.1 7.1 0.5 0.5 0.5 0.4 0.4 0.4 0.4 0.4 0.4 0.4
TRANSP WIND DIR.W W N N N NE NE NE NE NE NE N
TRANSP WIND SPD.10 10 6 6 6 7 7 7 7 7 7 7
FORECASTER...KH
REQUESTED BY...ED SMITH
TYPE OF REQUEST...PRESCRIBED
.TAG 2614311.0/STO
.DELDT 05/22/26
.FORMATTERVERSION 2.0.0
.EMAIL ED.SMITH@FIRE.CA.GOV
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