Spot Forecast
Issued by NWS Cheyenne, WY
Issued by NWS Cheyenne, WY
879
FNUS75 KCYS 191736
FWSCYS
Spot Forecast for Gras Fire...Alliance Fire Department
National Weather Service Cheyenne WY
1136 AM MDT Wed Jun 19 2024
If conditions become unrepresentative, contact the National Weather
Service at (307) 772-2227
.DISCUSSION...
Southeast winds will continue through the remainder of the afternoon.
gusts from these southeast winds up to 28-30 mph at times. Look for
chance for showers and storms to increase through the late afternoon.
peak time frame for storms will be 2100 to 0300...but could begin as
early as 1500. Low clouds and fog expected overnight as humidity
continues to increase...so expect excellent overnight humidity
recoveries. Fog and low clouds may persist through Thursday morning
before breaking up and showers and storms redevelop Thursday afternoon.
.REST OF TODAY...
Sky/weather.........Partly sunny (65-75 percent). Slight chance of
showers after 1500.
CWR.................5 percent.
LAL.................1.
Max temperature.....Around 66.
Min humidity........49 percent.
Wind (20 ft)........Southeast winds 16 to 18 mph with gusts to 28 mph.
Mixing height.......4500 ft AGL.
Transport winds.....Southeast 23 to 28 mph.
Smoke dispersal.....Good (88500 knot-ft) early in the morning
increasing to very good (107700 knot-ft) in the
afternoon.
Haines Index........2 or very low potential for large plume
dominated fire growth.
TIME (MDT) 1PM 2PM 3PM 4PM 5PM
Sky (%).........58 59 65 72 77
Weather cov..... SCH SCH SCH
Weather type.... RW RW RW
Tstm cov........
CWR.............10 10 10 10 10
LAL.............1 1 2 2 2
Temp............62 63 63 61 60
RH..............52 52 54 58 58
20 FT wind dir..SE SE SE SE SE
20 FT wind spd..18 18 17 17 16
20 FT wind gust.31 33 32 31 30
Mix hgt (kft)...4.4 4.5 4.5 4.4 4.2
Transp wind dir.SE SE SE SE SE
Transp wind spd.23 25 28 28 28
Haines index....2 2 2 2 2
SDspl kt-ft/100089 99 108 106 101
.TONIGHT...
Sky/weather.........Mostly cloudy (80-90 percent). Slight chance of
thunderstorms through 2000. Then chance of rain
showers and thunderstorms through 0300. Patchy
fog overnight.
CWR.................6 percent.
LAL.................3 until 2400, then 4 until 0300.
Min temperature.....Around 51.
Max humidity........100 percent.
Wind (20 ft)........Southeast winds 10 to 16 mph. Gusty and erratic
winds expected near thunderstorms in the
evening.
Mixing height.......1900 ft AGL.
Transport winds.....Southeast 21 to 26 mph.
Smoke dispersal.....Good (89000 knot-ft) early in the evening
decreasing to poor (33400 knot-ft) late in the
night.
Haines Index........2 to 3 or very low potential for large plume
dominated fire growth.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........78 82 79 84 86 86 87 89 89 90 85 86
Weather cov.....SCH SCH SCH CHC CHC CHC CHC CHC CHC SCH SCH SCH
Weather type....RW RW RW RW RW RW RW RW RW RNF RNF RNF
Tstm cov........SCH SCH SCH SCH SCH SCH CHC CHC CHC SCH SCH SCH
CWR.............10 10 10 10 10 10 10 10 10 10 10 10
LAL.............3 3 3 3 3 3 4 4 4 3 3 3
Temp............58 57 55 54 53 53 53 53 53 53 53 54
RH..............64 67 74 83 89 89 93 93 96 96 100 96
20 FT wind dir..SE SE SE SE SE SE SE SE SE SE SE SE
20 FT wind spd..16 15 14 14 13 12 12 12 10 10 10 12
20 FT wind gust.28 26 25 24 23 22 21 20 20 20 20 20
Mix hgt (kft)...3.9 3.2 2.5 2.0 1.9 2.0 2.2 2.1 2.1 2.0 1.9 1.9
Transp wind dir.SE SE SE SE SE SE SE S S S S S
Transp wind spd.26 26 25 25 25 25 24 23 22 21 21 21
Haines index....2 2 2 2 2 2 3 3 3 3 3 3
SDspl kt-ft/100089 74 55 44 42 44 45 43 40 36 35 33
.THURSDAY...
Sky/weather.........Mostly cloudy (70-80 percent) then becoming
partly sunny (45-55 percent). Patchy fog early
in the morning. Chance of rain showers in the
afternoon. Chance of thunderstorms late in the
afternoon.
CWR.................3 percent increasing to 44 percent in the
afternoon.
LAL.................1 until 1500, then 4.
Max temperature.....Around 79.
Min humidity........54 percent.
Wind (20 ft)........Southeast winds 10 to 16 mph. Gusty and erratic
winds expected near thunderstorms late in the
afternoon.
Mixing height.......5200 ft AGL.
Transport winds.....South 14 to 21 mph.
Smoke dispersal.....Poor (25400 knot-ft) early in the morning
increasing to good (88200 knot-ft) in the
afternoon.
Haines Index........4 to 5 or low to moderate potential for large
plume dominated fire growth.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........87 90 92 91 80 78 67 54 45 42 50 61
Weather cov.....PTY PTY CHC CHC CHC CHC CHC CHC
Weather type....FOG FOG RW RW RW RW RW RW
Tstm cov........ CHC CHC CHC
CWR.............0 0 0 0 0 0 40 40 40 40 40 40
LAL.............1 1 1 1 1 1 2 2 2 4 4 4
Temp............54 56 58 60 63 66 69 73 77 79 76 73
RH..............100 96 93 90 84 78 70 64 58 54 62 68
20 FT wind dir..SE SE SE SE SE SE SE SE SE SE SE E
20 FT wind spd..12 12 10 10 12 12 12 14 15 16 16 16
20 FT wind gust.20 20 18 18 20 21 22 24 26 28 28 28
Mix hgt (kft)...1.8 1.8 1.9 2.0 2.0 2.1 2.3 2.6 3.0 3.5 4.4 5.2
Transp wind dir.S S S S S S S S SE SE SE SE
Transp wind spd.21 20 18 16 15 14 15 17 18 20 20 20
Haines index....4 4 4 4 4 4 5 5 5 5 5 5
SDspl kt-ft/100033 31 30 28 26 25 30 39 48 60 75 88
$$
Forecaster...Claycomb
Requested by...Nick Hinman
Type of request...WILDFIRE
.TAG 2416364.1/CYS
.DELDT 06/19/24
.FormatterVersion 2.0.0
.EMAIL nhinman@cityofalliance.net