374
FNUS76 KSTO 190401
FWSSTO
SPOT FORECAST FOR IRISH RX...USFS
NATIONAL WEATHER SERVICE SACRAMENTO CA
901 PM PDT MON MAY 18 2026
FORECAST IS BASED ON IGNITION TIME OF 0600 PDT ON MAY 19.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.
DISCUSSION
MOSTLY SUNNY AND DRY CONDITIONS TO PERSIST OVER THE BURN SITE THE
NEXT FEW DAYS. MOSTLY LIGHT, TERRAIN DRIVEN WINDS DEVELOP BY TUESDAY
AFTERNOON. EAST WINDS TUESDAY MORNING AROUND 10 MPH SUSTAINED WITH
GUSTS UP TO AROUND 25 MPH POSSIBLE, THEN GRADUALLY SHIFTING TO THE
SOUTH AND WEST IN THE AFTERNOON. SIMILAR PATTERN EXPECTED ON
WEDNESDAY. DAYTIME HUMIDITY VALUES WILL BE IN THE LOW TO MID
TEENS ON TUESDAY, WITH UPPER TEENS TO LOW 20S ON WEDNESDAY. OVERNIGHT
RECOVERIES FORECAST TO BE IN THE LOW TO MID 30S.
TUESDAY
SKY/WEATHER.........SUNNY.
MAX TEMPERATURE.....71-75.
MIN HUMIDITY........13-17 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......EAST WINDS UP TO 8 MPH WITH GUSTS TO AROUND 21
MPH SHIFTING TO THE SOUTH UP TO 5 MPH LATE IN
THE MORNING, THEN SHIFTING TO THE WEST UP TO 8
MPH LATE IN THE MORNING.
RIDGETOP...........NORTH AROUND 1 MPH SHIFTING TO THE EAST 2 TO 3
MPH IN THE MORNING AND EARLY AFTERNOON, THEN
SHIFTING TO THE NORTH LATE IN THE AFTERNOON.
MIXING HEIGHT.......7800 FT AGL.
TRANSPORT WINDS.....EAST 9 TO 16 MPH SHIFTING TO THE SOUTHWEST
AROUND 7 MPH LATE IN THE MORNING, THEN SHIFTING
TO THE WEST AROUND 8 MPH LATE IN THE AFTERNOON.
CWR.................0 PERCENT.
CHANCE OF THUNDER...0 PERCENT.
TIME (PDT) 6 AM 10 AM 2 PM
SKY COVER.......CLEAR CLEAR CLEAR
CWR.............0 0 0
CHC OF THDR (%).0 0 0
TEMP............51 68 71
RH..............22 16 20
SL/VL WIND......E 8G21 S 5G10 W 8G17
RIDGETOP WIND...N 1 E 3 N 2
MIX HGT (FT)....500 4200 7600
TRANSPORT WIND..E 16 E 9 W 8
TUESDAY NIGHT
SKY/WEATHER.........MOSTLY CLEAR.
MIN TEMPERATURE.....51-55.
MAX HUMIDITY........33-37 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......NORTHWEST WINDS UP TO 5 MPH EARLY IN THE
EVENING BECOMING LIGHT, THEN BECOMING NORTHEAST
5 TO 7 MPH LATE IN THE EVENING.
RIDGETOP...........NORTHEAST 5 TO 7 MPH SHIFTING TO THE SOUTH 2 TO
3 MPH OVERNIGHT, THEN SHIFTING TO THE SOUTHWEST
3 TO 5 MPH AFTER 3 AM.
MIXING HEIGHT.......400 FT AGL.
TRANSPORT WINDS.....NORTHWEST AROUND 8 MPH SHIFTING TO THE EAST
AROUND 12 MPH OVERNIGHT.
CWR.................0 PERCENT.
CHANCE OF THUNDER...0 PERCENT.
TIME (PDT) 6 PM 10 PM 2 AM
SKY COVER.......CLEAR CLEAR CLEAR
CWR.............0 0 0
CHC OF THDR (%).0 0 0
TEMP............71 58 56
RH..............20 35 29
SL/VL WIND......NW 5G13 N 3G12 NE 7G16
RIDGETOP WIND...N 5 N 7 S 2
MIX HGT (FT)....4600 400 400
TRANSPORT WIND..NW 8 N 7 E 12
WEDNESDAY
SKY/WEATHER.........SUNNY.
MAX TEMPERATURE.....75-79.
MIN HUMIDITY........16-20 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......EAST WINDS 5 TO 7 MPH EARLY IN THE MORNING
BECOMING LIGHT, THEN BECOMING SOUTHWEST 5 TO 7
MPH LATE IN THE MORNING.
RIDGETOP...........SOUTHWEST 3 TO 5 MPH SHIFTING TO THE SOUTH
AROUND 3 MPH LATE IN THE AFTERNOON.
MIXING HEIGHT.......7100 FT AGL.
TRANSPORT WINDS.....EAST 8 TO 12 MPH SHIFTING TO THE SOUTHWEST 6 TO
8 MPH LATE IN THE MORNING.
CWR.................0 PERCENT.
CHANCE OF THUNDER...0 PERCENT.
TIME (PDT) 6 AM 10 AM 2 PM
SKY COVER.......MCLEAR MCLEAR MCLEAR
CWR.............0 0 0
CHC OF THDR (%).0 0 0
TEMP............54 70 75
RH..............26 21 23
SL/VL WIND......E 7G15 E 3G8 SW 7G16
RIDGETOP WIND...SW 5 S 3 S 3
MIX HGT (FT)....400 500 7100
TRANSPORT WIND..E 12 E 8 SW 8
FORECASTER...JW
REQUESTED BY...SYLVESTER RUIZ
TYPE OF REQUEST...PRESCRIBED
.TAG 2613983.0/STO
.DELDT 05/19/26
.FORMATTERVERSION 2.0.0
.EMAIL SYLVESTER.RUIZ@USDA.GOV
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