948
FNUS75 KBOU 261822
FWSBOU
SPOT FORECAST FOR DEVILS SLIDE...USFS
NATIONAL WEATHER SERVICE DENVER/BOULDER CO
1222 PM MDT FRI JUN 26 2026
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.
DISCUSSION
WIDELY SCATTERED HIGH-BASED SHOWERS AND A COUPLE OF
THUNDERSTORMS ARE EXPECTED THIS AFTERNOON. THE FIRST FEW SHOWERS
OF THE DAY HAVE DEVELOPED AROUND THE AREA, WITH THE STRONGEST
CELLS BETWEEN CASTLE ROCK AND CENTENNIAL. A COUPLE SHOWERS ARE
DEVELOPING IN THE VICINITY OF THE FIRE, WITH ADDITIONAL
DEVELOPMENT ALSO NOTED ACROSS MOST OF PARK COUNTY. WHILE THE
CHANCE OF LIGHTNING (30%) AND WETTING RAINFALL (10%) REMAIN LOW,
IT'S FAIRLY LIKELY THAT VARIABLE/GUSTY WINDS WILL BE AN ISSUE MOST
OF THE AFTERNOON. THE BEST CHANCE OF DIRECT IMPACTS
(LIGHTNING/RAIN) WILL BE BETWEEN NOW AND 5PM, WITH CHANCES
SLOWLY DECREASING IN THE EVENING. OUTSIDE OF OUTFLOW WINDS, WINDS
SHOULD PREDOMINANTLY BE OUT OF THE SOUTH OR SOUTHWEST.
WITH POLHEMUS RAWS ALREADY AT 80F AND 23% RH, IT'S LIKELY WE'LL
SEE A BIT MORE WARMING/DRYING OVER THE NEXT HOUR OR TWO.
TEMPERATURES TODAY SHOULD PEAK IN THE LOW 80S, WITH RELATIVE
HUMIDITY FALLING INTO ABOUT THE 16-21% RANGE.
TOMORROW WILL BE WARMER AND DRIER, WITH LOCALLY CRITICAL FIRE
WEATHER CONDITIONS LIKELY. WHILE A RED FLAG WARNING IS NOT IN
EFFECT FOR THE ZONE DUE TO REPORTED FUEL CONDITIONS, OUR FORECAST
DOES CALL FOR SEVERAL HOURS OF CRITICAL HUMIDITY (FALLING TO
AROUND 10-14%) AND SOUTHWESTERLY WIND GUSTS OF 30-40 MPH.
REST OF TODAY
SKY/WEATHER.........MOSTLY CLOUDY (50-60 PERCENT). CHANCE OF
SHOWERS AND THUNDERSTORMS UNTIL 1700, THEN
SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS.
CWR.................9 PERCENT.
CHANCE OF THUNDER...32 PERCENT.
MAX TEMPERATURE.....AROUND 83.
MIN HUMIDITY........19 PERCENT.
WIND (20 FT)........SOUTHWEST WINDS AROUND 7 MPH UNTIL 1300, THEN
SOUTH. GUSTY AND ERRATIC WINDS EXPECTED NEAR
THUNDERSTORMS.
MIXING HEIGHT.......11600 FT AGL UNTIL 1400, THEN 7600 FT AGL.
TRANSPORT WINDS.....WEST 13 TO 18 MPH.
SMOKE DISPERSAL.....VERY GOOD UNTIL 1500, THEN GOOD.
TIME (MDT) 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........55 55 55 58 57 59
WEATHER COV.....CHC CHC CHC CHC CHC SCH
WEATHER TYPE....RW RW RW RW RW RW
TSTM COV........CHC CHC CHC CHC CHC SCH
CWR.............10 10 10 10 10 10
CHC OF THDR (%).30 30 30 30 30 20
TEMP............80 82 81 81 79 78
RH..............23 20 21 23 25 25
20 FT WIND DIR..SW S S S S S
20 FT WIND SPD..7 8 7 7 8 8
20 FT WIND GUST.15 17 16 14 16 17
MIX HGT (KFT)...12 11 8.2 7.6 7.5 6.0
TRANSP WIND DIR.W W W SW SW W
TRANSP WIND SPD.13 14 17 15 14 17
VRATE KT-FT/1K..127 135 123 99 90 90
SMOKEDISPERSION.VG VG VG G G G
TONIGHT
SKY/WEATHER.........PARTLY CLOUDY (40-50 PERCENT). SLIGHT CHANCE OF
SHOWERS AND THUNDERSTORMS UNTIL 2100.
CWR.................6 PERCENT.
CHANCE OF THUNDER...15 PERCENT.
MIN TEMPERATURE.....AROUND 58.
MAX HUMIDITY........54 PERCENT.
WIND (20 FT)........WEST WINDS AROUND 8 MPH UNTIL 1900. SOUTHWEST
WITH GUSTS TO AROUND 21 MPH AFTER 2000. GUSTY
AND ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS
UNTIL 2100.
MIXING HEIGHT.......4600 FT AGL UNTIL 2000. BELOW 1000 FT AGL AFTER
2100.
TRANSPORT WINDS.....SOUTHWEST 11 TO 16 MPH UNTIL 2100, THEN 14 TO
19 MPH.
SMOKE DISPERSAL.....GOOD UNTIL 1900, THEN FAIR UNTIL 2000, THEN
POOR.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........47 47 52 59 58 62 57 45 48 46 41 39
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 10 10 10 0 0 0 0 0 0
TEMP............77 75 71 67 66 64 63 62 61 61 61 60
RH..............26 30 35 41 44 46 47 47 49 49 50 50
20 FT WIND DIR..W SW S S S S S S SW SW SW SW
20 FT WIND SPD..8 8 8 9 12 12 12 12 12 13 13 13
20 FT WIND GUST.13 13 13 15 18 18 18 18 18 21 21 21
MIX HGT (KFT)...5.2 4.6 1.2 0.6 0.6 0.7 0.8 0.8 0.8 0.8 0.7 0.7
TRANSP WIND DIR.W SW SW SW S S SW SW SW SW SW SW
TRANSP WIND SPD.14 12 12 14 15 15 17 17 17 17 18 18
VRATE KT-FT/1K..63 46 12 8 8 10 11 13 12 12 11 11
SMOKEDISPERSION.G F P P P P P P P P P P
SATURDAY
SKY/WEATHER.........PARTLY CLOUDY (25-35 PERCENT) UNTIL 0800, THEN
MOSTLY SUNNY (5-15 PERCENT).
CWR.................0 PERCENT.
CHANCE OF THUNDER...0 PERCENT.
MAX TEMPERATURE.....AROUND 86.
MIN HUMIDITY........11 PERCENT.
WIND (20 FT)........SOUTHWEST WINDS 12 TO 20 MPH UNTIL 1000, THEN
19 TO 27 MPH. GUSTS UP TO 37 MPH.
MIXING HEIGHT.......BELOW 1000 FT AGL UNTIL 0700. 11800 FT AGL
AFTER 1100.
TRANSPORT WINDS.....SOUTHWEST 16 TO 24 MPH UNTIL 1000, THEN 31 TO
36 MPH.
SMOKE DISPERSAL.....POOR UNTIL 0800, THEN GOOD UNTIL 0900, THEN
VERY GOOD UNTIL 1000, THEN EXCELLENT.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........34 26 6 5 10 10 14 13 14 15 11 8
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............60 59 64 69 75 78 82 82 83 84 86 84
RH..............50 54 44 35 26 21 17 16 14 13 12 12
20 FT WIND DIR..SW SW SW SW SW SW SW SW SW SW SW SW
20 FT WIND SPD..13 15 16 18 22 24 24 24 24 24 24 24
20 FT WIND GUST.21 24 25 30 35 37 37 37 37 37 37 37
MIX HGT (KFT)...0.7 1.0 3.3 5.1 7.3 9.1 10 11 12 12 12 12
TRANSP WIND DIR.SW SW SW SW SW SW SW SW SW SW SW SW
TRANSP WIND SPD.16 16 23 24 31 33 35 36 36 35 33 33
VRATE KT-FT/1K..9 14 65 108 197 265 310 341 368 364 346 343
SMOKEDISPERSION.P P G VG E E E E E E E E
FORECASTER...HIRIS
REQUESTED BY...JAMES PILSMAKER
TYPE OF REQUEST...WILDFIRE
.TAG 2616263.0/BOU
.DELDT 06/26/26
.FORMATTERVERSION 2.0.0
.EMAIL JAMES.PILSMAKER@USDA.GOV
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page