451
FNUS76 KSTO 191206
FWSSTO
SPOT FORECAST FOR IRISH RX...USFS
NATIONAL WEATHER SERVICE SACRAMENTO CA
506 AM PDT TUE MAY 19 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.
TODAY
SKY/WEATHER.........SUNNY.
MAX TEMPERATURE.....71-75.
MIN HUMIDITY........14-18 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 7
MPH LATE IN THE MORNING INCREASING TO 5 TO 6
MPH LATE IN THE AFTERNOON.
RIDGETOP...........SOUTHEAST 3 TO 5 MPH SHIFTING TO THE NORTH LATE
IN THE AFTERNOON.
MIXING HEIGHT.......7500 FT AGL.
TRANSPORT WINDS.....EAST 8 TO 15 MPH SHIFTING TO THE SOUTHWEST
AROUND 7 MPH LATE IN THE MORNING, THEN SHIFTING
TO THE WEST 8 TO 9 MPH LATE IN THE AFTERNOON.
CWR.................1 PERCENT.
CHANCE OF THUNDER...0 PERCENT.
TIME (PDT) 6 AM 8 AM 10 AM NOON 2 PM 4 PM
SKY COVER.......CLEAR CLEAR CLEAR CLEAR CLEAR CLEAR
CWR.............0 0 0 0 0 0
CHC OF THDR (%).0 0 0 0 0 0
TEMP............51 57 67 71 71 73
RH..............22 23 16 17 21 20
SL/VL WIND......E 8 E 6 S 5 W 6 W 7 W 6
SL/VL WIND GUST.21 15 10 14 17 15
RIDGETOP WIND...SE 5 SE 3 E 5 NE 5 N 3 N 3
MIX HGT (FT)....500 3700 3700 7500 7300 7300
TRANSPORT WIND..E 15 E 8 E 8 SW 7 W 8 W 8
TONIGHT
SKY/WEATHER.........CLEAR.
MIN TEMPERATURE.....52-56.
MAX HUMIDITY........32-36 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......NORTHWEST WINDS UP TO 5 MPH EARLY IN THE
EVENING BECOMING LIGHT, THEN BECOMING NORTHEAST
UP TO 7 MPH IN THE LATE EVENING AND OVERNIGHT.
RIDGETOP...........NORTHEAST 6 TO 7 MPH SHIFTING TO THE SOUTHWEST
AROUND 3 MPH AFTER 3 AM.
MIXING HEIGHT.......400 FT AGL.
TRANSPORT WINDS.....NORTHWEST AROUND 9 MPH SHIFTING TO THE EAST 10
TO 12 MPH OVERNIGHT.
CWR.................1 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 CLEAR CLEAR
CWR.............0 0 0 0 0 0
CHC OF THDR (%).0 0 0 0 0 0
TEMP............71 62 58 57 56 55
RH..............21 32 34 31 28 26
SL/VL WIND......W 5 NW 3 NE 5 NE 6 NE 7 NE 7
SL/VL WIND GUST.13 7 12 14 15 15
RIDGETOP WIND...N 6 NE 7 NE 7 E 6 S 2 SW 3
MIX HGT (FT)....4500 500 500 400 400 400
TRANSPORT WIND..NW 9 N 6 N 6 E 10 E 12 E 12
WEDNESDAY
SKY/WEATHER.........SUNNY.
MAX TEMPERATURE.....75-79.
MIN HUMIDITY........17-21 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......EAST WINDS 5 TO 6 MPH EARLY IN THE MORNING
BECOMING LIGHT, THEN BECOMING WEST 5 TO 7 MPH
LATE IN THE MORNING.
RIDGETOP...........WEST 1 TO 3 MPH SHIFTING TO THE NORTH AROUND 0
MPH LATE IN THE MORNING, THEN SHIFTING TO THE
SOUTH AROUND 1 MPH IN THE AFTERNOON.
MIXING HEIGHT.......7200 FT AGL.
TRANSPORT WINDS.....EAST AROUND 10 MPH SHIFTING TO THE SOUTHWEST 7
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 71 75
RH..............27 19 23
SL/VL WIND......E 6G15 S 3G9 W 7G15
RIDGETOP WIND...W 3 N 0 S 1
MIX HGT (FT)....400 2800 7200
TRANSPORT WIND..E 10 SE 5 SW 8
FORECASTER...EK
REQUESTED BY...SYLVESTER RUIZ
TYPE OF REQUEST...PRESCRIBED
.TAG 2613642.5/STO
.DELDT 05/19/26
.FORMATTERVERSION 2.0.0
.EMAIL SYLVESTER.RUIZ@USDA.GOV
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