Text Products for FWS Issued by CYS

Spot Forecast
Issued by NWS Cheyenne, WY
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000
FNUS75 KCYS 141152
FWSCYS

Spot Forecast for Collins Rx...USDA Forest Service
National Weather Service Cheyenne WY
552 AM MDT Sun Apr 14 2024

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

.DISCUSSION...

Warm and dry conditions continue today. Expect minimum RH around 20%
this afternoon with winds becoming southerly at 5 to 10 MPH. Winds
will increase late this afternoon through the evening. Gusts to around
45 MPH are expected between approximately midnight and noon Monday.
Warm, dry, and windy Monday with minimum RH between 20 and 25%. A strong
storm system will approach Monday afternoon, bringing the chance for PM
showers and thunderstorms. Gusty and erratic winds are possible near storms.
Additionally, expect rapidly changing wind directions behind the cold front
as winds go from southeast ahead of the front, to westerly behind. Brief
gusts to 60 MPH are possible with thunderstorms and along the cold front.
There is still some uncertainty in how much moisture will fall with these
storms, but the chance of a wetting rain Monday PM is about 25 to 30%.


.TODAY...

Sky/weather.........Sunny (5-15 percent).
CWR.................1 percent.
LAL.................1.
Max temperature.....Around 81.
Min humidity........19 to 21 percent.
Wind (20 ft)........Light winds becoming east then shifting to the
                    south 5 to 10 mph late in the morning.
Mixing height.......7800 ft AGL increasing to 14500 ft AGL late in
                    the afternoon.
Transport winds.....East 10 to 16 mph shifting to the south 17 to
                    20 mph in the afternoon.
Smoke dispersal.....Poor (5200 knot-ft) early in the morning
                    increasing to good (72900 knot-ft) in the
                    afternoon increasing to excellent (227600
                    knot-ft).
Haines Index........5 or moderate potential for large plume
                    dominated fire growth.

TIME (MDT)      6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........3   5   5   6   6   6   5   7   9   9   12  12
Weather cov.....
Weather type....
Tstm cov........
CWR.............0   0   0   0   0   0   0   0   0   0   0   0
LAL.............1   1   1   1   1   1   1   1   1   1   1   1
Temp............45  50  55  60  64  68  72  75  78  80  80  80
RH..............70  61  55  49  43  37  31  27  23  20  20  20
20 FT wind dir..NW  N   E   E   SE  SE  S   S   S   S   S   S
20 FT wind spd..2   3   5   7   7   9   10  10  10  10  9   8
20 FT wind gust.5   7   9   12  14  16  17  18  18  18  17  16
Mix hgt (kft)...0.6 0.7 1.0 1.6 2.4 3.6 5.2 7.8 11  13  14  15
Transp wind dir.E   E   E   SE  SE  S   S   S   S   S   S   S
Transp wind spd.10  13  16  20  20  18  16  17  17  18  18  20
Haines index....5   5   5   5   5   5   5   5   5   5   5   5
SDspl kt-ft/10005   8   14  28  41  57  73  117 160 205 228 246

.TONIGHT...

Sky/weather.........Mostly clear (10-20 percent).
CWR.................2 percent.
LAL.................1.
Min temperature.....Around 54.
Max humidity........55 to 57 percent.
Wind (20 ft)........South winds 10 to 20 mph increasing to 20 to 30
                    mph with gusts to around 45 mph overnight.
Mixing height.......4600 ft AGL decreasing to 0 ft AGL in the late
                    evening and overnight.
Transport winds.....South 20 to 29 mph increasing to 33 to 39 mph
                    overnight.
Smoke dispersal.....Excellent (159300 knot-ft) decreasing to good
                    (77900 knot-ft) early in the evening decreasing
                    to poor (0 knot-ft) late in the night early in
                    the evening.
Haines Index........4 to 5 or low to moderate potential for large
                    plume dominated fire growth.

TIME (MDT)      6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........14  17  16  11  14  15  17  15  13  14  14  9
Weather cov.....
Weather type....
Tstm cov........
CWR.............0   0   0   0   0   0   0   0   0   0   0   0
LAL.............1   1   1   1   1   1   1   1   1   1   1   1
Temp............79  74  69  64  63  62  61  60  59  57  56  55
RH..............21  24  30  35  38  39  42  44  45  49  51  53
20 FT wind dir..S   S   S   SE  S   S   S   S   S   S   S   S
20 FT wind spd..8   9   10  12  15  17  20  21  22  23  23  22
20 FT wind gust.15  16  18  22  26  31  36  39  40  41  41  40
Mix hgt (kft)...13  9.4 4.6 0.7 0.1 0.1 0.8 0.8 0.7 0.7 0.7 0.6
Transp wind dir.S   S   S   S   S   S   S   S   S   S   S   S
Transp wind spd.20  20  20  20  24  29  33  36  37  38  39  39
Haines index....4   4   4   4   4   4   5   5   5   5   5   5
SDspl kt-ft/1000224 159 78  12  0   2   23  24  24  23  22  21

.MONDAY...

Sky/weather.........Mostly sunny (25-35 percent). Chance of rain
                    showers and thunderstorms in the afternoon.
CWR.................2 percent increasing to 26 percent in the
                    afternoon.
LAL.................1 until 1500, then 3.
Max temperature.....Around 81.
Min humidity........22 to 24 percent.
Wind (20 ft)........South winds 15 to 25 mph with gusts to around
                    40 mph. Gusty and erratic winds expected near
                    thunderstorms late in the afternoon.
Mixing height.......8300 ft AGL increasing to 12100 ft AGL in the
                    afternoon.
Transport winds.....Southeast 35 to 40 mph.
Smoke dispersal.....Poor (13400 knot-ft) early in the morning
                    increasing to very good (101800 knot-ft) in the
                    afternoon increasing to excellent (197400
                    knot-ft) late in the morning, then increasing
                    to excellent (368900 knot-ft) early in the
                    afternoon decreasing to excellent (305200
                    knot-ft) late in the afternoon decreasing to
                    excellent (187500 knot-ft).
Haines Index........5 to 6 or moderate to high potential for large
                    plume dominated fire growth.

TIME (MDT)      6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........20  35  36  42  40  38  36  30  26  27  34  43
Weather cov.....                        CHC CHC CHC CHC CHC CHC
Weather type....                        RW  RW  RW  RW  RW  RW
Tstm cov........                                    SCH SCH SCH
CWR.............0   0   0   0   0   0   30  30  30  30  30  30
LAL.............1   1   1   1   1   1   1   1   1   3   3   3
Temp............54  57  60  63  67  71  74  76  78  80  78  77
RH..............57  53  51  48  42  36  33  28  26  23  24  24
20 FT wind dir..S   S   S   S   S   S   S   SE  SE  SE  SE  SE
20 FT wind spd..21  21  21  21  21  20  18  18  20  21  20  20
20 FT wind gust.39  38  38  38  36  35  33  35  36  37  36  35
Mix hgt (kft)...0.7 0.4 0.4 1.2 3.2 5.8 8.3 11  12  12  9.5 5.9
Transp wind dir.S   S   S   S   S   SE  SE  SE  SE  SE  SE  SE
Transp wind spd.39  38  36  35  37  39  40  40  39  37  37  37
Haines index....6   6   6   6   6   6   5   5   5   5   5   5
SDspl kt-ft/100022  14  13  35  102 197 290 369 410 388 305 188

$$
Forecaster...Natoli
Requested by...Ben Jech
Type of request...PRESCRIBED
.TAG 2410691.0/CYS
.DELDT 04/14/24
.FormatterVersion 2.0.0
.EMAIL benjamin.j.jech@usda.gov
National Weather Service Weather Forecast Office
