172
FNUS75 KBOU 191134
FWSBOU
SPOT FORECAST FOR FARNUM...FOREST SERVICE
NATIONAL WEATHER SERVICE DENVER/BOULDER CO
534 AM MDT WED AUG 19 2026
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.
DISCUSSION
ISOLATED LIGHT RAIN SHOWERS WILL CONTINUE AROUND THE AREA THIS
MORNING, CHANCES OF IMPACTS ARE LOW. THIS MORNING, TEMPERATURES
ARE AROUND 50 DEGREES, RHS ARE AROUND 75%, AND WINDS ARE LIGHT
FROM THE SOUTH. TEMPERATURES WILL WARM INTO THE UPPER 60S TODAY
AND RHS WILL DROP TO AROUND 32% IN THE EARLY TO MID AFTERNOON.
WINDS WILL START TO INCREASE OUT OF THE NORTHWEST BY THE LATE
MORNING. WIND GUSTS WILL BE AROUND 15 TO 25MPH THIS AFTERNOON
BEFORE DECREASING AROUND 6PM. THERE IS A MEDIUM CHANCE (55%) THAT
THUNDERSTORMS WILL BE IN AND AROUND THE AREA FOR MUCH OF THE
AFTERNOON AND EVENING. WINDS COULD BECOME GUSTY AND ERRATIC AS
STORMS MOVE NEAR THE AREA. STORM CHANCES WILL DECREASE AROUND
SUNSET. RHS WILL RECOVER INTO THE UPPER 60S OVERNIGHT AND WINDS
WILL BE LIGHT FROM THE WEST.
ON THURSDAY, TEMPERATURES WILL WARM INTO THE LOW 70S AND RHS WILL
DROP TO AROUND 21%. THUNDERSTORM COVERAGE WILL BE LOWER ON
THURSDAY COMPARED TO TODAY, BUT THERE IS STILL A 30% OF SHOWERS
AND THUNDERSTORMS IN THE AFTERNOON AND EARLY EVENING. WINDS WILL
GENERALLY BE OUT OF THE NORTHWEST EARLY THURSDAY AFTERNOON,
TURNING TO THE NORTHEAST BY THE LATE AFTERNOON. WIND SPEEDS WILL
BE AROUND 5 TO 10MPH, WITH GUSTS AROUND 15MPH.
REST OF TODAY
SKY/WEATHER.........MOSTLY SUNNY (15-25 PERCENT) UNTIL 1100, THEN
PARTLY CLOUDY (30-40 PERCENT) UNTIL 1200, THEN
MOSTLY CLOUDY (60-70 PERCENT). SLIGHT CHANCE OF
RAIN SHOWERS UNTIL 1200, THEN CHANCE OF RAIN
SHOWERS AND THUNDERSTORMS.
CWR.................2 PERCENT INCREASING TO 15 PERCENT IN THE
AFTERNOON.
CHANCE OF THUNDER...47 PERCENT.
MAX TEMPERATURE.....AROUND 71.
MIN HUMIDITY........30 PERCENT.
WIND (20 FT)........WEST WINDS 5 TO 7 MPH UNTIL 1000, THEN
NORTHWEST 6 TO 11 MPH WITH GUSTS TO AROUND 23
MPH. GUSTY AND ERRATIC WINDS EXPECTED NEAR
THUNDERSTORMS AFTER 1200.
MIXING HEIGHT.......BELOW 1000 FT AGL UNTIL 0900, THEN 1600 FT AGL
UNTIL 1000, THEN 4700 FT AGL UNTIL 1100, THEN
8500 FT AGL UNTIL 1700, THEN 5400 FT AGL.
TRANSPORT WINDS.....NORTHWEST 8 TO 14 MPH UNTIL 1100, THEN 14 TO 22
MPH.
SMOKE DISPERSAL.....POOR UNTIL 1000, THEN FAIR UNTIL 1100, THEN
VERY GOOD UNTIL 1300, THEN EXCELLENT UNTIL
1500, THEN VERY GOOD UNTIL 1700, THEN GOOD.
TIME (MDT) 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........21 23 12 22 37 57 66 73 74 65 65
WEATHER COV.....SCH SCH SCH SCH SCH CHC CHC CHC CHC CHC CHC
WEATHER TYPE....RW RW RW RW RW RW RW RW RW RW RW
TSTM COV........ CHC CHC CHC CHC CHC CHC
CWR.............0 0 0 0 0 20 20 20 20 20 20
CHC OF THDR (%).0 0 10 10 10 30 30 30 50 50 50
TEMP............49 51 55 62 65 68 69 69 70 68 68
RH..............77 71 61 46 40 33 31 31 30 35 36
20 FT WIND DIR..W W W NW NW NW NW NW NW NW NW
20 FT WIND SPD..5 5 5 6 8 9 10 10 9 9 9
20 FT WIND GUST.9 9 12 15 20 22 23 22 21 20 20
MIX HGT (KFT)...0.6 0.6 1.6 4.7 7.6 8.3 9.4 9.2 7.5 7.2 5.4
TRANSP WIND DIR.W W NW NW NW NW NW W NW NW NW
TRANSP WIND SPD.8 8 9 14 20 20 22 21 18 17 14
VRATE KT-FT/1K..4 4 13 56 129 141 179 166 121 108 64
SMOKEDISPERSION.P P P F VG VG E E VG VG G
TONIGHT
SKY/WEATHER.........MOSTLY CLOUDY (50-60 PERCENT) UNTIL 2100, THEN
PARTLY CLOUDY (25-35 PERCENT). SLIGHT CHANCE OF
RAIN SHOWERS AND THUNDERSTORMS UNTIL 2100.
CWR.................6 PERCENT.
CHANCE OF THUNDER...24 PERCENT.
MIN TEMPERATURE.....AROUND 47.
MAX HUMIDITY........74 PERCENT.
WIND (20 FT)........NORTHWEST WINDS 5 TO 12 MPH UNTIL 2000, THEN
NORTH 5 TO 7 MPH UNTIL 2200, THEN SOUTH AROUND
5 MPH UNTIL 2300, THEN WEST 5 TO 7 MPH. GUSTY
AND ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS
UNTIL 2100.
MIXING HEIGHT.......5400 FT AGL UNTIL 1900. BELOW 1000 FT AGL AFTER
2000.
TRANSPORT WINDS.....NORTHWEST 12 TO 17 MPH UNTIL 2000, THEN NORTH
AROUND 8 MPH UNTIL 2100, THEN NORTHWEST AROUND
9 MPH UNTIL 2200, THEN SOUTHWEST 8 TO 9 MPH
UNTIL 2400, THEN WEST UNTIL 0200, THEN LIGHT
UNTIL 0300, THEN WEST 8 TO 11 MPH UNTIL 0500,
THEN LIGHT.
SMOKE DISPERSAL.....GOOD UNTIL 1900, THEN POOR.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........52 52 53 45 31 25 22 21 15 17 19 21
WEATHER COV.....SCH SCH SCH
WEATHER TYPE....RW RW RW
TSTM COV........SCH SCH SCH
CWR.............10 10 10 0 0 0 0 0 0 0 0 0
CHC OF THDR (%).20 20 20 0 0 0 0 0 0 0 0 0
TEMP............65 62 58 56 54 52 52 52 50 49 49 49
RH..............41 50 60 62 66 71 69 69 74 71 71 68
20 FT WIND DIR..NW NW N N S W W SW SW W W W
20 FT WIND SPD..7 7 6 5 5 5 5 5 5 5 5 6
20 FT WIND GUST.18 15 14 12 8 8 7 8 8 9 9 10
MIX HGT (KFT)...5.4 3.3 0.6 0.6 0.5 0.5 0.4 0.4 0.5 0.4 0.4 0.4
TRANSP WIND DIR.NW NW N NW W SW W W W W W NW
TRANSP WIND SPD.15 13 8 9 7 6 6 7 7 8 8 7
VRATE KT-FT/1K..71 37 5 5 3 2 2 3 3 3 3 2
SMOKEDISPERSION.G P P P P P P P P P P P
THURSDAY
SKY/WEATHER.........MOSTLY SUNNY (10-20 PERCENT) UNTIL 1200, THEN
PARTLY CLOUDY (30-40 PERCENT) UNTIL 1500, THEN
MOSTLY CLOUDY (50-60 PERCENT). SLIGHT CHANCE OF
RAIN SHOWERS AND THUNDERSTORMS AFTER 1200 UNTIL
1500, THEN CHANCE OF RAIN SHOWERS AND
THUNDERSTORMS.
CWR.................7 PERCENT.
CHANCE OF THUNDER...30 PERCENT.
MAX TEMPERATURE.....AROUND 73.
MIN HUMIDITY........21 PERCENT.
WIND (20 FT)........WEST WINDS 5 TO 7 MPH UNTIL 1100. NORTHEAST
AROUND 8 MPH AFTER 1700. GUSTY AND ERRATIC
WINDS EXPECTED NEAR THUNDERSTORMS AFTER 1200.
MIXING HEIGHT.......BELOW 1000 FT AGL UNTIL 0900, THEN 1700 FT AGL
UNTIL 1000, THEN 4600 FT AGL UNTIL 1100, THEN
9400 FT AGL UNTIL 1300, THEN 10600 FT AGL UNTIL
1600, THEN 4900 FT AGL.
TRANSPORT WINDS.....LIGHT WINDS UNTIL 0700, THEN NORTHWEST AROUND 8
MPH UNTIL 0800, THEN LIGHT UNTIL 0900, THEN
NORTHWEST 8 TO 13 MPH.
SMOKE DISPERSAL.....POOR UNTIL 1000, THEN FAIR UNTIL 1100, THEN
GOOD UNTIL 1200, THEN VERY GOOD UNTIL 1500,
THEN GOOD UNTIL 1600, THEN FAIR UNTIL 1700,
THEN POOR.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........22 20 14 10 13 17 33 33 41 53 53 56
WEATHER COV..... SCH SCH SCH CHC CHC CHC
WEATHER TYPE.... RW RW RW RW RW RW
TSTM COV........ SCH SCH SCH CHC CHC CHC
CWR.............0 0 0 0 0 0 10 10 10 10 10 10
CHC OF THDR (%).0 0 0 0 0 0 20 20 20 30 30 30
TEMP............47 49 52 56 63 69 71 71 73 71 71 70
RH..............74 68 61 51 36 28 24 24 21 23 25 28
20 FT WIND DIR..W W NW W NW NW NW NW N N N NE
20 FT WIND SPD..6 5 5 6 6 7 8 8 8 7 7 8
20 FT WIND GUST.9 9 10 13 14 15 16 16 15 15 14 14
MIX HGT (KFT)...0.6 0.6 0.7 1.7 4.6 7.7 10 11 11 8.9 5.0 3.8
TRANSP WIND DIR.W NW NW NW NW NW NW NW NW NW N N
TRANSP WIND SPD.7 8 7 8 10 12 13 10 12 10 10 9
VRATE KT-FT/1K..3 4 4 12 41 77 111 102 111 81 45 31
SMOKEDISPERSION.P P P P F G VG VG VG G F P
FORECASTER...PETTETT
REQUESTED BY...RACHEL FERRELL
TYPE OF REQUEST...WILDFIRE
.TAG 2619976.0/BOU
.DELDT 08/19/26
.FORMATTERVERSION 2.0.0
.EMAIL COPBC@FIRENET.GOV,ALEXANDER.VILLARREAL@USDA.GOV,CHAD.BLAKE@USDA.GOV,RFERRELL@BLM.GOV
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