676
FNUS75 KBOU 201236
FWSBOU
SPOT FORECAST FOR FRONT COUNTRY RX...NPS
NATIONAL WEATHER SERVICE DENVER/BOULDER CO
536 AM MST THU NOV 20 2025
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.
DISCUSSION
LIGHT AND VARIABLE WINDS EARLY THIS MORNING SHOULD
QUICKLY TRANSITION TO THE EAST-SOUTHEAST BY THE MID-MORNING HOURS,
AND REMAIN OUT OF THAT DIRECTION THROUGH THE DAY. CHANCES FOR RAIN
AND SNOW SHOWERS WILL GRADUALLY INCREASE THROUGH THE DAY, WITH
BETTER CHANCES FOR ACCUMULATING SNOW AFTER SUNSET. AT LEAST A FEW
HOURS OF FAIR SMOKE DISPERSAL IS FORECAST TODAY. LIGHT SNOW
SHOWERS WILL CONTINUE TONIGHT INTO MOST OF FRIDAY. HOWEVER, RECENT
TRENDS ARE STARTING TO REDUCE PRECIPITATION/SNOW TOTALS IN THE
AREA. THE CHANCE OF WETTING PRECIPITATION IS ROUGHLY 40-50
PERCENT, AND TOTAL SNOW ACCUMULATION IS EXPECTED TO BE AN INCH OR
TWO. REGARDLESS, WINDS WILL REMAIN LIGHT TOMORROW WITH COOLER
TEMPERATURES AND POOR SMOKE DISPERSAL.
TODAY
SKY/WEATHER.........MOSTLY CLOUDY (75-85 PERCENT). CHANCE OF RAIN
AND SNOW AFTER 1200.
CWR.................8 PERCENT INCREASING TO 34 PERCENT LATE IN THE
AFTERNOON.
CHANCE OF PCPN......50 PERCENT.
CHANCE OF THUNDER...3 PERCENT.
MAX TEMPERATURE.....AROUND 46.
MIN HUMIDITY........45 PERCENT.
WIND (20 FT)........VARIABLE UP TO 5 MPH UNTIL 1000, THEN EAST 5 TO
8 MPH UNTIL 1700, THEN VARIABLE UP TO 5 MPH.
MIXING HEIGHT.......4100 FT AGL.
TRANSPORT WINDS.....LIGHT WINDS UNTIL 0700, THEN EAST 8 TO 10 MPH
UNTIL 0900, THEN 8 TO 14 MPH.
SMOKE DISPERSAL.....POOR UNTIL 1100, THEN FAIR UNTIL 1500, THEN
POOR.
TIME (MST) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........73 75 68 68 68 66 74 81 82 87 89 93
WEATHER COV..... SCH CHC CHC CHC CHC
WEATHER TYPE.... RS RS RS SN SN
TSTM COV........
CWR.............0 0 0 0 0 0 10 10 10 10 10 30
CHC OF PCPN (%).0 0 10 0 0 0 10 20 30 40 50 50
CHC OF THDR (%).0 0 0 0 0 0 0 0 0 0 0 0
TEMP............32 32 35 42 45 45 45 46 45 43 42 37
RH..............63 66 61 48 45 47 47 47 51 53 57 70
20 FT WIND DIR..W NW NE NE E E E E E E E E
20 FT WIND SPD..2 2 2 2 5 6 7 7 7 6 5 3
20 FT WIND GUST.3 3 3 3 7 9 12 12 12 9 7 6
MIX HGT (KFT)...2.3 2.3 2.2 2.8 3.8 4.8 5.3 5.1 4.7 4.3 3.3 2.5
TRANSP WIND DIR.NW NE E E SE SE SE SE E E E E
TRANSP WIND SPD.7 7 7 8 10 14 13 12 13 10 9 9
VRATE KT-FT/1K..14 14 13 19 34 57 59 51 52 38 26 20
SMOKEDISPERSION.P P P P P F F F F P P P
TONIGHT
SKY/WEATHER.........CLOUDY (90-100 PERCENT). CHANCE OF SNOW UNTIL
1900, THEN SNOW LIKELY.
CWR.................45 PERCENT.
CHANCE OF PCPN......70 PERCENT.
CHANCE OF THUNDER...2 PERCENT.
MIN TEMPERATURE.....AROUND 29.
MAX HUMIDITY........92 PERCENT.
WIND (20 FT)........NORTHEAST WINDS AROUND 5 MPH UNTIL 2000, THEN
VARIABLE UP TO 5 MPH.
MIXING HEIGHT.......2300 FT AGL.
TRANSPORT WINDS.....EAST AROUND 8 MPH UNTIL 1900, THEN NORTHEAST
8 TO 11 MPH UNTIL 0200, THEN NORTH 8 TO 10 MPH.
SMOKE DISPERSAL.....POOR.
TIME (MST) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........92 94 94 94 93 91 93 94 94 94 95 96
WEATHER COV.....CHC LKY LKY LKY LKY LKY LKY LKY LKY LKY LKY LKY
WEATHER TYPE....SN SN SN SN SN SN SN SN SN SN SN SN
TSTM COV........
CWR.............40 40 40 40 40 40 40 40 40 50 40 40
CHC OF PCPN (%).50 60 70 70 60 60 60 70 70 70 70 70
CHC OF THDR (%).0 0 0 0 0 0 0 0 0 0 0 0
TEMP............35 33 33 32 33 32 32 32 32 31 32 32
RH..............75 82 82 85 82 85 85 85 85 88 85 85
20 FT WIND DIR..NE NE NE NE N N N NW NW NW NW N
20 FT WIND SPD..3 3 2 2 2 2 2 1 2 2 2 2
20 FT WIND GUST.6 6 3 3 3 3 3 2 3 3 3 3
MIX HGT (KFT)...2.5 2.5 2.3 2.3 2.4 2.5 2.5 2.4 2.3 2.3 2.3 2.3
TRANSP WIND DIR.E E NE NE NE NE NE N N N NW NW
TRANSP WIND SPD.8 7 8 8 7 7 6 7 7 7 8 8
VRATE KT-FT/1K..18 15 16 16 14 15 12 13 14 15 15 16
SMOKEDISPERSION.P P P P P P P P P P P P
FRIDAY
SKY/WEATHER.........CLOUDY (85-95 PERCENT). SNOW LIKELY UNTIL 1100,
THEN CHANCE OF SNOW
CWR.................41 PERCENT DECREASING TO 7 PERCENT.
CHANCE OF PCPN......70 PERCENT.
CHANCE OF THUNDER...5 PERCENT.
MAX TEMPERATURE.....AROUND 42.
MIN HUMIDITY........70 PERCENT.
WIND (20 FT)........VARIABLE UP TO 5 MPH.
MIXING HEIGHT.......3500 FT AGL.
TRANSPORT WINDS.....NORTHWEST 8 TO 11 MPH UNTIL 1000. WEST 8 TO 9
MPH AFTER 1600.
SMOKE DISPERSAL.....POOR.
TIME (MST) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........97 96 95 92 93 93 94 93 91 88 86 83
WEATHER COV.....LKY LKY LKY LKY LKY CHC CHC CHC CHC CHC CHC CHC
WEATHER TYPE....SN SN SN SN SN SN SN SN SN SN SN SN
TSTM COV........
CWR.............40 40 40 40 40 20 20 20 20 20 20 10
CHC OF PCPN (%).70 70 70 70 70 40 40 40 30 30 30 20
CHC OF THDR (%).0 0 0 0 0 10 10 10 0 0 0 0
TEMP............30 32 34 37 39 40 40 40 41 40 39 37
RH..............92 89 85 75 70 70 73 73 70 70 70 75
20 FT WIND DIR..N N N N N N N N N N NW W
20 FT WIND SPD..2 2 3 3 3 5 5 5 5 3 3 2
20 FT WIND GUST.3 3 6 6 6 7 7 7 7 6 6 8
MIX HGT (KFT)...2.5 2.7 2.9 3.2 3.4 3.7 3.7 3.6 3.6 3.2 2.8 2.3
TRANSP WIND DIR.NW NW NW NW NW NW NW W W W W W
TRANSP WIND SPD.8 8 8 8 7 7 7 6 6 6 6 6
VRATE KT-FT/1K..18 19 21 21 22 22 21 19 18 16 14 12
SMOKEDISPERSION.P P P P P P P P P P P P
FORECASTER...HIRIS
REQUESTED BY...AARON KLEE
TYPE OF REQUEST...PRESCRIBED
.TAG 2526184.2/BOU
.DELDT 11/20/25
.FORMATTERVERSION 2.0.0
.EMAIL AARON_KLEE@NPS.GOV,NATHAN_HALLAM@NPS.GOV
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