220
FNUS75 KRIW 181240
FWSRIW
SPOT FORECAST FOR SVF UNIT 1...USFS-BTF
NATIONAL WEATHER SERVICE RIVERTON WY
640 AM MDT WED MAR 18 2026
FORECAST IS BASED ON IGNITION TIME OF 0900 MDT ON MARCH 18.
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER
SERVICE
DISCUSSION
BUILDING HIGH PRESSURE WILL BRING A DRY AND WARM DAY WITH SUNSHINE
AND ONLY A FEW PASSING CLOUDS. WIND WILL START OF LIGHT BEFORE
BECOMING SOUTHWEST AND INCREASING TO 8 TO 12 MPH WITH GUSTS TO
15 TO 2- MPH AFTER 1200. MIXING AND SMOKE DISPERSAL WILL START OFF
POOR BEFORE BECOMING FAIR AFTER 1100 AS MORNING INVERSIONS LIFT.
WIND SHOULD BECOME LIGHT TONIGHT AFTER SUNSET AS MIXING DECREASES.
DRY AND WARM WEATHER WILL CONTINUE THE REST OF THE WORK THROUGH AT
LEAST SATURDAY.
..THUNDERSTORMS IMPLY STRONG GUSTY AND ERRATIC WINDS
REST OF TODAY
SKY/WEATHER.........SUNNY (0-10 PERCENT).
CWR.................0 PERCENT.
CHANCE OF PCPN......0 PERCENT.
CHANCE OF THUNDER...0 PERCENT.
MAX TEMPERATURE.....AROUND 61.
MIN HUMIDITY........36 PERCENT.
WIND (20 FT)........LIGHT WINDS UNTIL 1100, THEN SOUTHWEST 8 TO 11
MPH WITH GUSTS TO AROUND 17 MPH.
RIDGETOP WIND.......SOUTH 10 TO 15 MPH UNTIL 1300, THEN SOUTHWEST
15 TO 20 MPH.
MIXING HEIGHT.......2500 FT AGL UNTIL 1300, THEN 3500 FT AGL.
TRANSPORT WINDS.....SOUTHWEST 10 TO 18 MPH.
SMOKE DISPERSAL.....POOR UNTIL 1200, THEN FAIR.
TIME (MDT) 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........5 5 5 5 5 5 5 5 5
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CWR.............0 0 0 0 0 0 0 0 0
CHC OF PCPN (%).0 0 0 0 0 0 0 0 0
CHC OF THDR (%).0 0 0 0 0 0 0 0 0
TEMP............42 46 49 52 55 57 58 58 60
RH..............67 55 46 41 38 37 36 37 37
20 FT WIND DIR..S S S SW SW SW W SW W
20 FT WIND SPD..4 5 6 8 11 11 11 10 10
20 FT WIND GUST.6 7 8 13 17 17 17 16 16
RIDGE WIND DIR..S S S SW SW SW W SW W
RIDGE WIND SPD..10 10 10 15 20 20 20 15 15
MIX HGT (KFT)...1.0 1.5 2.0 2.5 3.0 3.5 3.5 3.5 3.0
TRANSP WIND DIR.SW SW SW SW W W W W W
TRANSP WIND SPD.12 10 12 15 18 18 18 17 17
SDSPL KT-FT/100011 12 20 33 50 59 59 51 42
TONIGHT
SKY/WEATHER.........MOSTLY CLEAR (5-15 PERCENT).
CWR.................0 PERCENT.
CHANCE OF PCPN......0 PERCENT.
CHANCE OF THUNDER...0 PERCENT.
MIN TEMPERATURE.....AROUND 39.
MAX HUMIDITY........52 PERCENT.
WIND (20 FT)........WEST WINDS AROUND 8 MPH WITH GUSTS TO AROUND 13
MPH UNTIL 1900, THEN LIGHT.
RIDGETOP WIND.......SOUTHWEST 10 TO 15 MPH UNTIL 2300, THEN SOUTH.
MIXING HEIGHT.......1000 FT AGL.
TRANSPORT WINDS.....SOUTHWEST 8 TO 15 MPH.
SMOKE DISPERSAL.....POOR.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........5 15 15 15 5 5 5 5 5 5 5 5
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
CHC OF PCPN (%).0 0 0 0 0 0 0 0 0 0 0 0
CHC OF THDR (%).0 0 0 0 0 0 0 0 0 0 0 0
TEMP............58 55 52 48 47 46 44 44 43 42 42 41
RH..............43 43 46 49 49 49 49 48 50 50 52 52
20 FT WIND DIR..W W SW S S S S S S S S S
20 FT WIND SPD..8 6 4 4 4 4 4 4 3 3 3 3
20 FT WIND GUST.13 8 6 6 6 6 6 6
RIDGE WIND DIR..W W SW S S S S S S S S S
RIDGE WIND SPD..15 10 10 10 10 10 10 10 10 10 10 10
MIX HGT (KFT)...2.5 1.5 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0
TRANSP WIND DIR.W W SW SW SW SW SW SW SW SW SW SW
TRANSP WIND SPD.15 12 9 9 9 9 9 9 8 8 8 9
SDSPL KT-FT/100030 13 9 9 9 9 9 9 8 8 8 9
THURSDAY
SKY/WEATHER.........SUNNY (0-10 PERCENT).
CWR.................0 PERCENT.
CHANCE OF PCPN......0 PERCENT.
CHANCE OF THUNDER...0 PERCENT.
MAX TEMPERATURE.....AROUND 65.
MIN HUMIDITY........31 PERCENT.
WIND (20 FT)........LIGHT WINDS UNTIL 1500, THEN WEST AROUND 7 MPH.
RIDGETOP WIND.......SOUTH AROUND 10 MPH UNTIL 1200, THEN WEST.
MIXING HEIGHT.......2500 FT AGL UNTIL 1200, THEN 5000 FT AGL UNTIL
1500, THEN 5500 FT AGL UNTIL 1700, THEN 3500 FT
AGL.
TRANSPORT WINDS.....SOUTHWEST 8 TO 17 MPH UNTIL 1400, THEN WEST 18
TO 21 MPH.
SMOKE DISPERSAL.....POOR UNTIL 1100. FAIR EARLY IN THE MORNING
INCREASING TO GOOD IN THE AFTERNOON AFTER 1400.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........5 5 5 0 0 0 0 0 0 0 0 0
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
CHC OF PCPN (%).0 0 0 0 0 0 0 0 0 0 0 0
CHC OF THDR (%).0 0 0 0 0 0 0 0 0 0 0 0
TEMP............40 41 42 43 47 52 56 59 62 63 63 62
RH..............48 48 48 47 46 44 42 39 37 35 35 35
20 FT WIND DIR..SE S S S S SW SW W W W W W
20 FT WIND SPD..3 3 3 3 3 4 5 6 6 7 7 7
20 FT WIND GUST. 6 7 8 10 11 11 11
RIDGE WIND DIR..SE S S S S SW SW W W W W W
RIDGE WIND SPD..10 10 10 10 10 10 10 10 15 15 15 15
MIX HGT (KFT)...1.0 1.0 1.0 1.0 1.5 2.5 3.5 4.0 5.0 5.5 4.5 3.5
TRANSP WIND DIR.SW S S SW SW SW W W W W W W
TRANSP WIND SPD.8 8 8 8 8 12 15 17 18 21 20 18
SDSPL KT-FT/10008 7 7 7 10 25 46 63 77 97 77 58
FORECAST DAYS 3 THROUGH 5
FRIDAY
MOSTLY CLEAR. LOWS AROUND 40. HIGHS IN THE MID 60S. LIGHT WINDS.
SATURDAY
MOSTLY CLEAR. LOWS IN THE LOWER 40S. HIGHS IN THE MID 60S. LIGHT
WINDS.
SUNDAY
COOLER. MOSTLY CLOUDY. SLIGHT CHANCE OF SHOWERS. LOWS IN THE MID
30S. HIGHS IN THE MID 50S. LIGHT WINDS.
FORECASTER...HATTINGS
REQUESTED BY...MICHAEL MCEWEN
TYPE OF REQUEST...PRESCRIBED
.TAG 2605908.0/RIW
.DELDT 03/18/26
.FORMATTERVERSION 2.0.0
.EMAIL MICHAEL.MCEWEN@USDA.GOV
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