683
FNUS75 KBOU 122055
FWSBOU
SPOT FORECAST FOR NUNN FIRE...USFS
NATIONAL WEATHER SERVICE DENVER/BOULDER CO
255 PM MDT FRI SEP 12 2025
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.
DISCUSSION
MOSTLY CLOUDY WITH RAIN SHOWERS LIKELY AND A CHANCE OF
THUNDERSTORMS. MINIMUM HUMIDITY 45 PERCENT. SOUTH WINDS 6 TO 12 MPH
EXCEPT GUSTY AND ERRACTIC NEAR SHOWERS AND THUNDERSTORMS.
TONIGHT, MOSTLY CLOUDY WITH A CHANCE OF SHOWERS AND A SLIGHT CHANCE
OF THUNDERSTORMS UNTIL 2400, THEN PARTLY CLOUDY WITH A SLIGHT
CHANCE OF RAIN SHOWERS. HUMIDITY RECOVERY AROUND 80 PERCENT.
SOUTHWEST WINDS 7 TO 14 MPH. GUSTY AND ERRACTIC WINDS NEAR SHOWERS
AND THUNDERSTORMS UNTIL 2400.
REST OF TODAY
SKY/WEATHER.........MOSTLY CLOUDY (80-90 PERCENT). RAIN SHOWERS
LIKELY AND CHANCE OF THUNDERSTORMS.
CWR.................31 PERCENT.
CHANCE OF THUNDER...40 PERCENT.
MAX TEMPERATURE.....AROUND 59.
MIN HUMIDITY........45 PERCENT.
WIND (20 FT)........SOUTH WINDS 6 TO 12 MPH. GUSTY AND ERRATIC
WINDS EXPECTED NEAR THUNDERSTORMS.
MIXING HEIGHT.......3400 FT AGL.
TRANSPORT WINDS.....SOUTH 11 TO 16 MPH.
SMOKE DISPERSAL.....FAIR UNTIL 1600. POOR AFTER 1700.
TIME (MDT) 3PM 4PM 5PM
SKY (%).........80 88 88
WEATHER COV.....LKY LKY LKY
WEATHER TYPE....RW RW RW
TSTM COV........CHC CHC CHC
CWR.............30 30 30
CHC OF THDR (%).40 40 40
TEMP............56 54 52
RH..............49 57 59
20 FT WIND DIR..S S S
20 FT WIND SPD..9 9 8
20 FT WIND GUST.15 15 13
MIX HGT (KFT)...4.4 2.6 1.7
TRANSP WIND DIR.S S S
TRANSP WIND SPD.12 14 13
VRATE KT-FT/1K..44 31 19
SMOKEDISPERSION.F P P
TONIGHT
SKY/WEATHER.........MOSTLY CLOUDY (70-80 PERCENT) UNTIL 2400, THEN
PARTLY CLOUDY (40-50 PERCENT). SLIGHT CHANCE OF
THUNDERSTORMS UNTIL 2400. CHANCE OF RAIN
SHOWERS UNTIL 2400, THEN SLIGHT CHANCE OF RAIN
SHOWERS UNTIL 0500.
CWR.................12 PERCENT.
CHANCE OF THUNDER...16 PERCENT.
MIN TEMPERATURE.....AROUND 38.
MAX HUMIDITY........82 PERCENT.
WIND (20 FT)........SOUTHWEST WINDS 7 TO 14 MPHH. GUSTY AND ERRATIC
WINDS EXPECTED NEAR THUNDERSTORMS UNTIL 2400.
MIXING HEIGHT.......1200 FT AGL UNTIL 2000, THEN BELOW 1000 FT AGL.
TRANSPORT WINDS.....SOUTHWEST 8 TO 13 MPH UNTIL 2000, THEN 11 TO 16
MPH.
SMOKE DISPERSAL.....POOR.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........90 85 86 84 70 59 49 47 47 40 42 42
WEATHER COV.....CHC CHC CHC CHC SCH SCH SCH SCH SCH SCH SCH
WEATHER TYPE....RW RW RW RW RW RW RW RW RW RW RW
TSTM COV........SCH SCH SCH
CWR.............10 10 10 10 10 10 10 10 10 10 10 0
CHC OF THDR (%).20 20 20 10 10 10 10 10 10 0 0 0
TEMP............49 48 46 45 44 43 42 41 41 40 40 40
RH..............68 74 79 79 79 79 79 82 76 76 76 73
20 FT WIND DIR..SW SW SW SW SW SW SW SW SW SW SW SW
20 FT WIND SPD..8 7 6 7 7 7 8 7 8 8 8 7
20 FT WIND GUST.13 12 9 12 12 12 13 12 13 13 13 12
MIX HGT (KFT)...1.4 1.2 0.5 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2
TRANSP WIND DIR.SW SW W SW SW SW SW SW SW W SW SW
TRANSP WIND SPD.10 10 12 12 12 12 13 14 13 14 13 13
VRATE KT-FT/1K..13 11 5 2 2 2 2 2 2 2 2 2
SMOKEDISPERSION.P P P P P P P P P P P P
SATURDAY
SKY/WEATHER.........PARTLY CLOUDY (35-45 PERCENT) UNTIL 1100, THEN
MOSTLY CLOUDY (75-85 PERCENT). SLIGHT CHANCE OF
RAIN SHOWERS AFTER 0900 UNTIL 1200, THEN RAIN
SHOWERS AND CHANCE OF THUNDERSTORMS.
CWR.................5 PERCENT INCREASING TO 77 PERCENT IN THE
AFTERNOON.
CHANCE OF THUNDER...44 PERCENT.
MAX TEMPERATURE.....AROUND 55.
MIN HUMIDITY........40 PERCENT.
WIND (20 FT)........SOUTHWEST 5 TO 8 MPH UNTIL 1500, THEN SOUTH
AROUND 6 MPH UNTIL 1600, THEN SOUTHWEST UNTIL
1700, THEN WEST. GUSTY AND ERRATIC WINDS EXPECTED
NEAR THUNDERSTORMS AFTER 1200.
MIXING HEIGHT.......BELOW 1000 FT AGL UNTIL 0900, THEN 3200 FT AGL
UNTIL 1100, THEN 5600 FT AGL UNTIL 1400, THEN
3300 FT AGL.
TRANSPORT WINDS.....SOUTHWEST 8 TO 13 MPH UNTIL 1200, THEN
SOUTHEAST.
SMOKE DISPERSAL.....POOR UNTIL 1100, THEN FAIR UNTIL 1300, THEN
POOR.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........41 46 32 34 43 70 92 92 92 92 92 92
WEATHER COV..... SCH SCH SCH DEF DEF DEF DEF DEF DEF
WEATHER TYPE.... RW RW RW RW RW RW RW RW RW
TSTM COV........ CHC CHC CHC CHC CHC CHC
CWR.............0 0 0 10 10 10 80 80 80 80 80 80
CHC OF THDR (%).0 0 0 10 10 10 30 30 30 40 40 40
TEMP............39 38 43 51 52 54 55 55 53 51 48 46
RH..............73 79 67 52 48 43 40 40 48 54 60 65
20 FT WIND DIR..SW W SW SW SW SW SW SW S S SW W
20 FT WIND SPD..6 6 5 6 6 7 7 7 6 6 6 6
20 FT WIND GUST.9 9 7 9 9 12 12 12 9 9 9 9
MIX HGT (KFT)...0.2 0.2 0.3 1.5 3.8 5.6 5.9 4.2 2.9 3.4 2.7 2.1
TRANSP WIND DIR.SW W W W SW S SE SE S SE S S
TRANSP WIND SPD.12 10 10 10 8 9 9 9 10 12 12 12
VRATE KT-FT/1K..2 2 3 13 26 45 47 34 26 34 27 21
SMOKEDISPERSION.P P P P P F F P P P P P
FORECASTER...RPK
REQUESTED BY...MELISSA MCKIBBEN
TYPE OF REQUEST...WILDFIRE
.TAG 2521883.0/BOU
.DELDT 09/12/25
.FORMATTERVERSION 2.0.0
.EMAIL CONCC@FIRENET.GOV
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