787
FNUS75 KCYS 072227
FWSCYS

Spot Forecast for Sioux Wildfire...Harrison FD
National Weather Service Cheyenne WY
427 PM MDT Thu Aug 7 2025

If conditions become unrepresentative, contact the National Weather
Service at (307) 772-2227

...RED FLAG WARNING IN EFFECT UNTIL 8 PM MDT THIS EVENING...

.DISCUSSION...A Red Flag Warning remains in effect this evening for
northern Sioux county, including the area of the wildfire. Gusty
west to southwest winds up to 30 mph will continue over the next
couple of hours before winds subside by 900 PM local time. Surface
winds are expected to shift into the northwest after midnight as
a cool front begins to push across the high plains. This will result
in much better overnight humidity recoveries and minimum humidities
trending much higher for Friday afternoon.

.REST OF TODAY...

Sky/weather.........Mostly sunny (25-40 percent). Chance of showers
                    and thunderstorms below 10 percent this evening.
CWR.................0 percent.
Max temperature.....Around 101 degrees.
Min humidity........Around 11 percent.
Wind (20 ft)........Southwest winds around 15 mph with gusts up to 30
                    mph.
Mixing height.......14100 ft AGL.
Transport winds.....West around 21 mph.
Smoke dispersal.....Excellent (253900 knot-ft).

TIME (MDT)      5PM
Sky (%).........30
Weather cov.....
Weather type....
Tstm cov........
CWR.............0
LAL.............M
Temp............98
RH..............13
20 FT wind dir..SW
20 FT wind spd..13
20 FT wind gust.23
Mix hgt (kft)...14
Transp wind dir.W
Transp wind spd.21
Haines index....M
SDspl kt-ft/1000254

.TONIGHT...

Sky/weather.........Mostly clear (20-30 percent).
CWR.................0 percent.
Min temperature.....60 to 65 degrees.
Max humidity........60 to 75 percent.
Wind (20 ft)........Southwest winds 9 to 13 mph, shifting into the
                    northwest late.
Mixing height.......200 ft AGL.
Transport winds.....Southwest 13 to 18 mph.
Smoke dispersal.....very good (136800 knot-ft) decreasing to poor
                    (2100 knot-ft).

TIME (MDT)      6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........18  20  34  35  39  26  14  15  8   17  21  26
Weather cov.....
Weather type....
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............96  92  84  81  79  78  76  74  73  68  67  64
RH..............15  18  22  24  27  27  27  30  31  37  42  48
20 FT wind dir..SW  SW  SW  SW  SW  SW  SW  SW  SW  SW  W   W
20 FT wind spd..13  12  12  12  12  12  12  12  10  9   9   9
20 FT wind gust.23  22  21  20  21  22  22  21  20  17  16  16
Mix hgt (kft)...8.6 0.7 0.3 0.2 0.3 0.2 0.2 0.2 0.2 0.2 0.2 0.2
Transp wind dir.W   W   SW  SW  SW  SW  SW  SW  SW  W   W   W
Transp wind spd.18  15  14  14  14  15  15  15  13  13  13  13
Haines index....M   M   M   M   M   M   M   M   M   M   M   M
SDspl kt-ft/1000137 9   3   3   3   2   3   2   2   2   2   2

.FRIDAY...

Sky/weather.........Partly sunny (55-65 percent). Slight chance of
                    showers and thunderstorms late in the afternoon.
CWR.................5 percent.
Max temperature.....Around 85 degrees.
Min humidity........30 to 40 percent.
Wind (20 ft)........Northwest winds 9 to 16 mph with occasional gusts
                    up to 35 mph. Gusty and erratic winds expected
                    near thunderstorms late in the afternoon.
Mixing height.......6100 ft AGL.
Transport winds.....Northwest 13 to 20 mph.
Smoke dispersal.....Increasing to very good (103700 knot-ft) in the
                    afternoon.

TIME (MDT)      6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........58  58  52  42  38  54  39  64  68  81  71  69
Weather cov.....                        SCH SCH SCH SCH SCH SCH
Weather type....                        RW  RW  RW  RW  RW  RW
Tstm cov........                                    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............62  64  65  69  74  76  79  82  83  84  82  81
RH..............60  65  68  63  55  54  47  40  37  36  38  39
20 FT wind dir..W   W   NW  NW  NW  NW  NW  NW  NW  NW  NW  NW
20 FT wind spd..9   9   10  12  12  12  12  13  15  16  16  14
20 FT wind gust.16  17  18  20  20  21  21  24  28  29  28  25
Mix hgt (kft)...0.3 0.4 0.9 1.4 1.8 2.4 3.4 4.8 5.9 6.1 5.7 3.9
Transp wind dir.W   W   W   W   W   W   NW  W   NW  NW  NW  NW
Transp wind spd.14  13  16  15  14  14  16  17  18  20  20  17
Haines index....M   M   M   M   M   M   M   M   M   M   M   M
SDspl kt-ft/10004   5   13  19  22  29  47  73  95  104 97  58

$$

Requested by...Harrison Fire Department
Type of request...WILDFIRE
.TAG 2519524.0/CYS
.DELDT 08/07/25
.FormatterVersion 2.0.0
.EMAIL hvfd@vistabeam.com