Suppression Forecast
Issued by NWS Cheyenne, WY
Issued by NWS Cheyenne, WY
463
FNUS75 KCYS 220202
FWSCYS
Spot Forecast for ski hill...Usfs
National Weather Service Cheyenne WY
802 PM MDT Mon Jul 21 2025
If conditions become unrepresentative, contact the National Weather
Service at (307) 772-2227
.DISCUSSION...
Diurnal drainage winds will turn to primarily west-southwesterly winds
around 7am Tuesday. Winds will strengthen to 12 to 14 mph gusting to
around 20 mph during the afternoon hours. Afternoon minimum humidity
values will drop to around 20 to 25 percent Tuesday afternoon, but
overnight humidity recoveries will be in the 65 to 70 percent range.
There is a 20 to 25 percent chance for afternoon showers and storms on
Tuesday, which will be capable of producing gusty and erratic winds gusts
up to 40 mph. Precipitation chances decrease by 6pm, though more showers
and storms will be possible on Wednesday, likely with more widespread
coverage. Minimum afternoon humidity and overnight recoveries will be
similar for Wednesday.
.TUESDAY...
Sky/weather.........Mostly sunny (35-45 percent). Chance of
sprinkles in the morning, then slight chance of
showers and thunderstorms in the afternoon.
CWR.................6 percent.
LAL.................
Max temperature.....Around 75.
Min humidity........24 percent.
Wind (20 ft)........Southwest winds 7 to 10 mph. Gusty and erratic
winds expected near thunderstorms in the
afternoon.
Mixing height.......9000 ft AGL.
Transport winds.....Southwest 8 to 10 mph increasing to 15 to 20
mph in the late morning and afternoon.
Smoke dispersal.....Poor (3500 knot-ft) early in the morning
increasing to good (91800 knot-ft) in the
afternoon increasing to very good (111300
knot-ft) early in the morning increasing to
excellent (153700 knot-ft) in the afternoon
late in the morning.
Haines Index........MISSING.
TIME (MDT) MID 1AM 2AM 3AM 4AM 5AM 6AM 7AM 8AM 9AM 10A 11A
Sky (%).........22 21 19 20 23 32 43 51 51 53 56 53
Weather cov.....CHC CHC CHC CHC CHC CHC SCH SCH SCH SCH SCH SCH
Weather type....RW RW RW RW RW RW RW RW RW RW RW RW
Tstm cov........ SCH SCH SCH SCH SCH SCH
CWR.............0 0 0 0 0 0 10 10 10 10 10 10
LAL.............M M M M M M M M M M M M
Temp............50 52 59 65 69 73 73 74 75 75 75 75
RH..............66 61 51 41 35 29 29 28 26 25 25 24
20 FT wind dir..S SW SW SW SW SW SW W W W W SW
20 FT wind spd..7 7 8 9 10 10 10 10 10 9 9 9
20 FT wind gust.12 14 15 17 18 20 20 20 18 17 17 18
Mix hgt (kft)...0.5 0.6 1.8 4.0 6.1 7.7 8.7 9.0 8.8 8.3 8.0 7.4
Transp wind dir.S S SW W W W SW SW W W SW SW
Transp wind spd.8 9 10 15 17 18 20 20 20 18 17 17
Haines index....M M M M M M M M M M M M
SDspl kt-ft/10004 5 17 52 92 124 148 154 150 133 120 111
.TUESDAY NIGHT...
Sky/weather.........Mostly cloudy (55-65 percent) then becoming
partly cloudy (40-50 percent). Chance of
sprinkles early in the evening.
CWR.................3 percent.
LAL.................
Min temperature.....Around 49.
Max humidity........66 percent.
Wind (20 ft)........Southwest winds 6 to 9 mph shifting to the
southeast 5 to 6 mph late in the evening, then
becoming light after 3 am.
Mixing height.......400 ft AGL.
Transport winds.....Southwest 9 to 15 mph shifting to the south 6
to 14 mph in the late evening and overnight.
Smoke dispersal.....Good (94700 knot-ft) early in the evening
decreasing to poor (1800 knot-ft) late in the
night.
Haines Index........MISSING.
TIME (MDT) 12P 1PM 2PM 3PM 4PM 5PM 6PM 7PM 8PM 9PM 10P 11P
Sky (%).........58 57 60 62 56 56 58 56 50 45 43 42
Weather cov.....CHC CHC CHC
Weather type....RW RW RW
Tstm cov........
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
LAL.............M M M M M M M M M M M M
Temp............74 72 69 65 61 59 57 55 54 52 50 49
RH..............25 26 27 34 41 45 49 57 57 63 66 63
20 FT wind dir..SW SW SW S S S SE SE SE SE SE S
20 FT wind spd..9 8 7 7 6 6 6 6 5 5 3 2
20 FT wind gust.17 16 14 12 12 12 12 10 9 8 7 6
Mix hgt (kft)...7.3 6.6 0.9 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.4 0.4
Transp wind dir.SW W SW S S S SE S S S S S
Transp wind spd.15 13 12 9 10 13 14 13 12 9 7 6
Haines index....M M M M M M M M M M M M
SDspl kt-ft/100095 72 9 4 5 6 6 6 5 4 2 2
.WEDNESDAY...
Sky/weather.........Mostly sunny (40-50 percent). Chance of showers
and thunderstorms in the afternoon.
CWR.................6 percent.
LAL.................
Max temperature.....Around 76.
Min humidity........21 percent.
Wind (20 ft)........Light winds becoming northwest 5 to 7 mph in
the late morning and afternoon. Gusty and
erratic winds expected near thunderstorms in
the afternoon.
Mixing height.......9900 ft AGL increasing to 10500 ft AGL in the
afternoon.
Transport winds.....Southwest around 5 mph shifting to the west
early in the morning.
Smoke dispersal.....Poor (1900 knot-ft) early in the morning
increasing to good (94500 knot-ft) in the
afternoon.
Haines Index........MISSING.
TIME (MDT) MID 1AM 2AM 3AM 4AM 5AM 6AM 7AM 8AM 9AM 10A 11A
Sky (%).........46 44 41 39 41 42 54 54 54 54 54 54
Weather cov..... CHC CHC CHC CHC CHC CHC
Weather type.... RW RW RW RW RW RW
Tstm cov........ CHC CHC CHC CHC CHC CHC
CWR.............0 0 0 0 0 0 10 10 10 10 10 10
LAL.............M M M M M M M M M M M M
Temp............51 55 60 63 66 69 73 73 74 74 74 74
RH..............59 51 42 38 32 27 22 22 21 21 21 21
20 FT wind dir..S S SW W W W NW NW NW NW NW NW
20 FT wind spd..2 2 2 3 5 5 6 6 6 6 6 7
20 FT wind gust.7 7 8 9 12 13 15 16 16 16 17 17
Mix hgt (kft)...0.5 0.5 0.9 2.0 4.5 7.5 9.9 11 10 9.6 9.6 9.3
Transp wind dir.S SW W W W W W W W W W W
Transp wind spd.5 5 5 6 7 8 9 10 10 10 10 10
Haines index....M M M M M M M M M M M M
SDspl kt-ft/10002 2 4 10 27 53 79 95 92 87 87 84
$$
Forecaster...Mose
Requested by...Zach alexander
Type of request...WILDFIRE
.TAG 2518395.0/CYS
.DELDT 07/21/25
.FormatterVersion 2.0.0
.EMAIL zqalex13@gmail.com