386
FNUS75 KBOU 201554
FWSBOU
SPOT FORECAST FOR BOULDER CANYON FIRE...NWS BOULDER
NATIONAL WEATHER SERVICE DENVER/BOULDER CO
954 AM MDT THU AUG 20 2026
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.
DISCUSSION
VERY WARM AND DRY CONDITIONS WILL PERSIST TODAY UNDER MOSTLY SUNNY
SKIES. EAST WINDS OF 6-10 MPH WILL PERSIST THROUGH MOST OF THE
DAY, WITH A FEW GUSTS AS HIGH AS 14 MPH LATE THIS MORNING THROUGH
MID AFTERNOON. HUMIDITY READINGS WILL BE LOW WITH MINIMUMS
DROPPING TO 17%.
FOR TONIGHT, LIGHT AND VARIABLE WINDS WILL TURN LIGHT DOWNSLOPE/
DOWNVALLEY BY 8 PM. ONLY MODERATE HUMIDITY RECOVERY WILL OCCUR AT
BEST.
FRIDAY WILL FEATURE HOTTER TEMPERATURES AND HIGHS IN THE MID TO
UPPER 90S. HUMIDITY READINGS WILL BE DOWN TO 15%. ISOLATED TO
SCATTERED VIRGA OR A HIGH BASED SHOWER/STORM IN THE AFTERNOON
COULD PRODUCE SUDDEN AND VARIABLE GUSTY OUTFLOW WINDS TO 40+ MPH.
REST OF TODAY
SKY/WEATHER.........MOSTLY SUNNY (15-25 PERCENT) UNTIL 1600, THEN
PARTLY CLOUDY (25-35 PERCENT).
CWR.................1 PERCENT.
CHANCE OF THUNDER...5 PERCENT.
MAX TEMPERATURE.....AROUND 92.
MIN HUMIDITY........17 PERCENT.
WIND (20 FT)........EAST 5 TO 10 MPH.
MIXING HEIGHT.......4800 FT AGL UNTIL 1200, THEN 8600 FT AGL.
TRANSPORT WINDS.....LIGHT WINDS UNTIL 1100, THEN NORTH 8 TO 13 MPH.
SMOKE DISPERSAL.....POOR UNTIL 1100, THEN FAIR UNTIL 1200, THEN
GOOD UNTIL 1700, THEN FAIR.
TIME (MDT) 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........11 13 14 18 19 21 25 31
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CWR.............0 0 0 0 0 0 0 0
CHC OF THDR (%).0 0 10 10 10 0 0 0
TEMP............79 83 85 87 89 87 87 87
RH..............30 26 23 21 19 19 19 20
20 FT WIND DIR..E E E E E E E E
20 FT WIND SPD..5 6 6 6 7 6 6 6
20 FT WIND GUST.7 9 9 9 12 9 9 9
MIX HGT (KFT)...3.3 5.3 7.2 7.9 8.4 8.8 7.9 7.6
TRANSP WIND DIR.N N N N N N N N
TRANSP WIND SPD.7 9 10 12 10 9 9 8
VRATE KT-FT/1K..20 42 65 79 76 71 64 53
SMOKEDISPERSION.P F G G G G G F
TONIGHT
SKY/WEATHER.........MOSTLY CLEAR (20-30 PERCENT).
CWR.................1 PERCENT.
CHANCE OF THUNDER...2 PERCENT.
MIN TEMPERATURE.....AROUND 66.
MAX HUMIDITY........44 PERCENT.
WIND (20 FT)........EAST WINDS AROUND 5 MPH UNTIL 1900, THEN
VARIABLE UP TO 5 MPH UNTIL 2000, THEN WEST 5 TO
7 MPH UNTIL 2300, THEN 5 TO 8 MPH.
MIXING HEIGHT.......6200 FT AGL UNTIL 1900. BELOW 1000 FT AGL AFTER
2000.
TRANSPORT WINDS.....EAST 8 TO 9 MPH UNTIL 2000, THEN LIGHT UNTIL
2200, THEN WEST 8 TO 11 MPH.
SMOKE DISPERSAL.....POOR.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........31 34 32 36 26 19 24 14 17 23 22 21
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CWR.............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............84 81 77 75 73 73 72 70 70 69 68 68
RH..............23 26 31 34 37 37 38 39 38 39 41 39
20 FT WIND DIR..E E SW W W W W W W W W W
20 FT WIND SPD..5 3 5 6 5 5 5 6 6 7 6 6
20 FT WIND GUST.7 6 7 9 7 7 7 9 9 12 9 9
MIX HGT (KFT)...6.2 2.5 0.5 0.4 0.4 0.5 0.3 0.3 0.3 0.3 0.5 0.4
TRANSP WIND DIR.E SE SE S W W W W W W W W
TRANSP WIND SPD.6 6 7 7 7 6 8 9 9 9 10 10
VRATE KT-FT/1K..31 13 3 3 3 2 2 3 3 2 4 3
SMOKEDISPERSION.P P P P P P P P P P P P
FRIDAY
SKY/WEATHER.........MOSTLY SUNNY (10-20 PERCENT) UNTIL 1200, THEN
PARTLY CLOUDY (40-50 PERCENT) UNTIL 1400, THEN
MOSTLY CLOUDY (55-65 PERCENT). CHANCE OF
SHOWERS AND THUNDERSTORMS AFTER 1300.
CWR.................7 PERCENT.
CHANCE OF THUNDER...26 PERCENT.
MAX TEMPERATURE.....AROUND 95.
MIN HUMIDITY........15 PERCENT.
WIND (20 FT)........WEST WINDS 5 TO 7 MPH UNTIL 0800, THEN VARIABLE
UP TO 5 MPH UNTIL 1000, THEN EAST 5 TO 10 MPH.
GUSTY AND ERRATIC WINDS EXPECTED NEAR
THUNDERSTORMS AFTER 1300.
MIXING HEIGHT.......BELOW 1000 FT AGL UNTIL 0900, THEN 1700 FT AGL
UNTIL 1000, THEN 5200 FT AGL UNTIL 1100, THEN
8600 FT AGL UNTIL 1200, THEN 11100 FT AGL UNTIL
1600, THEN 5900 FT AGL.
TRANSPORT WINDS.....WEST 8 TO 12 MPH UNTIL 0900, THEN NORTHWEST 8
TO 9 MPH UNTIL 1100, THEN LIGHT UNTIL 1200,
THEN NORTHWEST 8 TO 12 MPH.
SMOKE DISPERSAL.....POOR UNTIL 1100, THEN FAIR UNTIL 1200, THEN
GOOD UNTIL 1300, THEN VERY GOOD UNTIL 1400,
THEN GOOD UNTIL 1600, THEN FAIR.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........17 27 18 20 20 19 23 50 59 67 60 57
WEATHER COV..... CHC CHC CHC SCH SCH
WEATHER TYPE.... RW RW RW RW RW
TSTM COV........ CHC CHC CHC SCH SCH
CWR.............0 0 0 0 0 0 0 10 10 10 10 10
CHC OF THDR (%).0 0 0 0 0 0 10 30 30 20 20 20
TEMP............68 67 73 78 85 87 91 91 92 89 89 87
RH..............39 44 37 33 26 22 19 19 18 20 20 22
20 FT WIND DIR..W W W W NE E E E NE NE N NW
20 FT WIND SPD..6 6 5 2 3 5 5 5 6 6 6 7
20 FT WIND GUST.9 9 7 3 6 7 7 7 9 9 9 12
MIX HGT (KFT)...0.4 0.5 0.6 1.7 5.2 8.6 12 12 11 9.6 5.7 5.9
TRANSP WIND DIR.W W W NW NW NW NW NW NW NW N N
TRANSP WIND SPD.10 10 8 6 6 7 8 10 9 8 9 9
VRATE KT-FT/1K..4 5 4 8 26 52 81 103 86 67 46 47
SMOKEDISPERSION.P P P P P F G VG G G F F
FORECASTER...BARJENBRUCH
REQUESTED BY...NWS BOULDER
TYPE OF REQUEST...WILDFIRE
.TAG 2620088.0/BOU
.DELDT 08/20/26
.FORMATTERVERSION 2.0.0
.EMAIL NWS.BOULDER@NOAA.GOV
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