Spot Forecast
Issued by NWS Cheyenne, WY

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983
FNUS75 KCYS 171959
FWSCYS

Spot Forecast for Pole RX 9/10...USFS
National Weather Service Cheyenne WY
159 PM MDT Mon Jun 17 2024

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


.DISCUSSION...

Wednesday will start off cool, with a chance of rain showers by 1500.
Thursday and Friday will see increasing temperatures, and humidity
values decreasing to the middle to upper 30 percent range by 1500.
Afternoon showers and thunderstorm chances increase after 1500 for
both Thursday and Friday afternoon, with gusty and erratic winds
possible up to 25-35mph. Sustained winds of 10-15mph from the south,
southwest after 1200 both days can be expected. Wetting rainfall
is possible greater than 0.10 inches after 1500 both days. Mixing
heights and ventilation will struggle in the morning hours, but
increase to good to excellent by the afternoon timeframe.

.JUNETEENTH...

Sky/weather.........Mostly sunny (40-50 percent). Slight chance of
                    rain showers in the morning, then chance of
                    showers and thunderstorms in the afternoon.
CWR.................11 percent.
LAL.................1 until 1200, then 2 until 1500, then 3.
Max temperature.....Around 58-61.
Min humidity........50 percent.
Wind (20 ft)........Southeast winds 17 to 24 mph with gusts to
                    around 37 mph. Gusty and erratic winds expected
                    near thunderstorms early in the afternoon.
                    Gusty and erratic winds expected near
                    thunderstorms late in the afternoon.
Mixing height.......2200 ft AGL.
Transport winds.....South 26 to 35 mph decreasing to 18 to 23 mph
                    late in the afternoon.
Smoke dispersal.....Poor (31500 knot-ft) early in the morning
                    increasing to fair (55200 knot-ft) in the
                    afternoon.
Haines Index........2 to 3 or very low potential for large plume
                    dominated fire growth.

TIME (MDT)      7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........57  51  45  43  40  37  37  36  35  37  38
Weather cov.....SCH SCH SCH SCH SCH CHC CHC CHC CHC CHC CHC
Weather type....RW  RW  RW  RW  RW  RW  RW  RW  RW  RW  RW
Tstm cov........                    SCH SCH SCH CHC CHC CHC
CWR.............0   0   0   0   0   10  10  10  10  10  10
LAL.............1   1   1   1   1   2   2   2   3   3   3
Temp............41  42  44  47  49  52  54  56  58  57  57
RH..............77  72  70  66  62  58  57  53  51  54  58
20 FT wind dir..SE  SE  SE  SE  SE  SE  SE  SE  SE  SE  SE
20 FT wind spd..21  23  24  23  22  21  21  20  20  18  17
20 FT wind gust.32  35  37  36  33  32  31  31  31  30  30
Mix hgt (kft)...1.5 1.7 1.8 1.9 1.9 1.9 1.8 1.8 1.8 2.0 2.2
Transp wind dir.SE  S   S   S   S   S   S   S   S   S   S
Transp wind spd.33  35  35  33  32  30  26  23  20  18  18
Haines index....2   2   2   2   2   3   3   3   3   3   3
SDspl kt-ft/100042  49  55  55  53  48  42  35  32  33  37

.WEDNESDAY NIGHT...

Sky/weather.........Partly cloudy (40-50 percent) then becoming
                    mostly cloudy (60-70 percent). Chance of
                    showers and thunderstorms in the evening, then
                    slight chance of showers and thunderstorms
                    overnight.
CWR.................6 percent.
LAL.................3 until 2100, then 1 until 2400, then 2 until
                    0300, then 1.
Min temperature.....Around 46-48.
Max humidity........95-100 percent.
Wind (20 ft)........Southeast winds around 17 mph. Gusty and
                    erratic winds expected near thunderstorms early
                    in the evening. Gusty and erratic winds
                    expected near thunderstorms overnight.
Mixing height.......900 ft AGL.
Transport winds.....South 20 to 30 mph.
Smoke dispersal.....Fair (40400 knot-ft) early in the evening
                    decreasing to poor (19900 knot-ft) late in the
                    night.
Haines Index........3 to 4 or very low to low potential for large
                    plume dominated fire growth.

TIME (MDT)      6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........39  43  47  51  57  62  68  71  74  77  74  70
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........CHC CHC CHC             SCH SCH SCH
CWR.............10  10  10  10  10  10  0   0   0   0   0   0
LAL.............3   3   3   1   1   1   2   2   2   1   1   1
Temp............56  53  51  48  48  48  48  48  48  48  48  48
RH..............62  68  78  86  88  89  89  92  95  96  95  92
20 FT wind dir..SE  SE  SE  SE  SE  SE  SE  SE  S   S   S   S
20 FT wind spd..17  17  17  17  17  17  17  17  17  17  17  17
20 FT wind gust.29  29  29  29  29  29  29  29  28  28  28  26
Mix hgt (kft)...2.4 2.2 1.9 1.6 1.5 1.4 1.3 1.1 1.0 0.9 1.0 1.1
Transp wind dir.S   SE  SE  SE  S   S   S   S   S   S   S   S
Transp wind spd.20  21  23  25  26  29  29  29  28  26  24  22
Haines index....3   3   3   3   3   3   4   4   4   4   4   4
SDspl kt-ft/100040  40  38  35  34  34  32  28  24  21  20  20

.THURSDAY...

Sky/weather.........Mostly sunny (40-50 percent). Rain showers
                    likely and chance of thunderstorms in the
                    afternoon.
CWR.................3 percent increasing to 20 percent in the
                    afternoon.
LAL.................1 until 1200, then 3.
Max temperature.....Around 72-74.
Min humidity........38-40 percent.
Wind (20 ft)........South winds 15 to 17 mph. Gusty and erratic
                    winds expected near thunderstorms in the
                    afternoon.
Mixing height.......7500 ft AGL increasing to 11700 ft AGL in the
                    afternoon.
Transport winds.....Southwest 14 to 22 mph.
Smoke dispersal.....Poor (7400 knot-ft) early in the morning
                    increasing to good (70600 knot-ft) in the
                    afternoon increasing to good (99000 knot-ft)
                    early in the morning increasing to very good
                    (148500 knot-ft) in the afternoon late in the
                    morning.
Haines Index........4 or low potential for large plume dominated
                    fire growth.

TIME (MDT)      6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........67  54  42  29  28  28  27  31  34  38  44  50
Weather cov.....                        LKY LKY LKY LKY LKY LKY
Weather type....                        RW  RW  RW  RW  RW  RW
Tstm cov........                        CHC CHC CHC CHC CHC CHC
CWR.............0   0   0   0   0   0   20  20  20  20  20  20
LAL.............1   1   1   1   1   1   3   3   3   3   3   3
Temp............49  51  54  58  62  65  68  70  70  70  69  67
RH..............86  79  70  62  54  47  42  39  38  39  41  45
20 FT wind dir..S   S   S   S   S   S   S   S   S   S   S   S
20 FT wind spd..17  17  17  17  16  16  15  15  15  15  15  15
20 FT wind gust.26  26  26  26  26  26  26  26  28  28  28  26
Mix hgt (kft)...1.1 0.6 0.4 1.1 4.0 7.5 10  12  12  11  9.6 7.7
Transp wind dir.SW  SW  SW  SW  SW  SW  SW  SW  S   S   S   S
Transp wind spd.21  21  22  22  21  18  16  15  14  14  14  15
Haines index....4   4   4   4   4   4   4   4   4   4   4   4
SDspl kt-ft/100020  12  7   21  71  118 143 149 145 135 120 99

$$
Forecaster...Wills
Requested by...Coyde Fickel
Type of request...PRESCRIBED
.TAG 2416294.0/CYS
.DELDT 06/17/24
.FormatterVersion 2.0.0
.EMAIL Coyde.fickel@usda.gov