FNUS75 KRIW 241622 FWSRIW Spot Forecast for TEST SPOT for RIW Backup...Test National Weather Service Riverton WY Issued by National Weather Service Cheyenne WY 1022 AM MDT Wed Apr 24 2024 Forecast is based on forecast start time of 1100 MDT on April 24. If conditions become unrepresentative, contact the National Weather Service .DISCUSSION... This is a test spot forecast in support of service backup for RIW/CYS. This is only a test. ...Thunderstorms imply strong gusty and erratic winds... ...Haines index is high level haines both day and night... .REST OF TODAY... Sky/weather.........Mostly sunny (40-50 percent). Slight chance of thunderstorms early in the afternoon. Slight chance of rain showers in the afternoon. CWR.................0 percent. Chance of pcpn......20 percent. LAL.................1. Max temperature.....Around 67. Min humidity........23 percent. Wind (20 ft)........Southwest winds 10 to 14 mph. Gusty and erratic winds expected near thunderstorms early in the afternoon. Ridgetop wind.......Southwest 15 to 20 mph. Mixing height.......900 ft AGL increasing to 10200 ft AGL in the afternoon. Transport winds.....Southwest 15 to 21 mph. Smoke dispersal.....Poor (12300 knot-ft) increasing to excellent (166700 knot-ft) in the afternoon. Haines Index........4 or low potential for large plume dominated fire growth. TIME (MDT) 11A 12P 1PM 2PM 3PM 4PM 5PM Sky (%).........22 30 43 54 67 65 54 Weather cov..... SCH SCH SCH SCH SCH Weather type.... RW RW RW RW RW Tstm cov........ SCH SCH CWR.............0 0 0 0 0 0 0 Chc of pcpn (%).0 10 20 20 20 20 20 LAL.............1 1 1 1 1 1 1 Temp............55 58 62 66 63 66 66 RH..............41 34 28 24 29 26 25 20 FT wind dir..SW SW W W SW SW SW 20 FT wind spd..10 10 11 14 13 14 13 20 FT wind gust.13 14 16 18 18 18 17 Ridge wind dir..SW SW SW SW SW SW SW Ridge wind spd..15 20 20 20 20 20 20 Mix hgt (kft)...0.9 9.8 9.8 9.8 10 10 10 Transp wind dir.S SW SW SW W W W Transp wind spd.15 20 20 20 21 21 21 Haines index....4 4 4 4 4 4 4 SDspl kt-ft/100012 167 167 167 184 184 184 .TONIGHT... Sky/weather.........Mostly cloudy (55-65 percent) then becoming partly cloudy (40-50 percent). CWR.................0 percent. Chance of pcpn......10 percent. LAL.................1. Min temperature.....Around 40. Max humidity........76 percent. Wind (20 ft)........West winds 9 to 13 mph shifting to the northwest 7 to 8 mph late in the evening, then shifting to the northeast 6 to 7 mph late in the evening shifting to the southwest around 6 mph after 3 am. Ridgetop wind.......West around 15 mph shifting to the north in the late evening and overnight, then shifting to the southwest after 3 am. Mixing height.......8400 ft AGL decreasing to 500 ft AGL in the late evening and overnight. Transport winds.....West 13 to 21 mph shifting to the north around 12 mph overnight, then shifting to the northwest after 3 am. Smoke dispersal.....Excellent (151900 knot-ft) decreasing to poor (4500 knot-ft) in the late evening and overnight. Haines Index........4 or low potential for large plume dominated fire growth. TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM Sky (%).........54 52 53 54 57 65 59 57 54 50 46 42 Weather cov..... Weather type.... Tstm cov........ CWR.............0 0 0 0 0 0 0 0 0 0 0 0 Chc of pcpn (%).10 10 10 10 10 10 10 10 10 10 10 10 LAL.............1 1 1 1 1 1 1 1 1 1 1 1 Temp............65 63 57 54 52 51 49 47 45 43 42 42 RH..............26 26 37 41 48 52 56 60 65 73 73 73 20 FT wind dir..W W W NW N NE N E N SW W SW 20 FT wind spd..13 10 9 8 7 7 6 6 6 6 6 6 20 FT wind gust.17 14 12 11 10 10 10 10 8 10 10 10 Ridge wind dir..W W W N N N NE NE NE SW SW SW Ridge wind spd..15 15 15 15 15 15 10 10 10 10 10 10 Mix hgt (kft)...8.4 8.4 8.4 0.7 0.7 0.7 0.5 0.5 0.5 0.5 0.5 0.5 Transp wind dir.W W W W W W N N N NW NW NW Transp wind spd.21 21 21 13 13 13 12 12 12 12 12 12 Haines index....4 4 4 4 4 4 4 4 4 4 4 4 SDspl kt-ft/1000152 152 152 7 7 7 5 5 5 5 5 5 .THURSDAY... Sky/weather.........Mostly sunny (45-55 percent) then becoming mostly cloudy (70-80 percent). Isolated rain showers in the morning, then scattered rain showers and isolated thunderstorms in the afternoon. CWR.................4 percent. Chance of pcpn......40 percent. LAL.................1 until 1200, then 2. Max temperature.....Around 63. Min humidity........28 percent. Wind (20 ft)........Southwest winds 6 to 13 mph shifting to the west around 15 mph late in the afternoon. Gusty and erratic winds expected near thunderstorms in the afternoon. Ridgetop wind.......Southwest 10 to 15 mph increasing to around 20 mph in the afternoon. Mixing height.......500 ft AGL increasing to 1500 ft AGL late in the morning, then increasing to 6700 ft AGL early in the afternoon decreasing to 5300 ft AGL late in the afternoon. Transport winds.....South 12 to 16 mph shifting to the southwest around 21 mph in the afternoon. Smoke dispersal.....Poor (4500 knot-ft) increasing to good (95300 knot-ft) early in the morning increasing to very good (120700 knot-ft) in the afternoon in the afternoon. Haines Index........3 or very low potential for large plume dominated fire growth. TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM Sky (%).........38 35 33 34 37 43 50 59 67 73 75 76 Weather cov..... ISO ISO SCT SCT SCT SCT ISO Weather type.... RW RW RW RW RW RW RW Tstm cov........ ISO ISO ISO ISO ISO ISO CWR.............0 0 0 0 0 0 0 0 0 0 0 0 Chc of pcpn (%).10 10 10 10 10 20 20 30 30 40 30 20 LAL.............1 1 1 1 1 1 2 2 2 2 2 2 Temp............41 44 47 51 54 58 62 61 60 59 58 57 RH..............76 68 60 54 45 36 28 29 31 33 36 38 20 FT wind dir..S S S S SW SW SW SW SW SW SW W 20 FT wind spd..6 6 6 7 9 11 13 13 13 13 13 15 20 FT wind gust.8 10 10 10 11 14 17 18 18 17 18 19 Ridge wind dir..S S S SW SW SW SW SW SW SW SW SW Ridge wind spd..10 10 10 15 15 15 20 20 20 20 20 20 Mix hgt (kft)...0.5 0.5 0.5 1.5 1.5 1.5 6.7 6.7 6.7 5.3 5.3 5.3 Transp wind dir.SE SE SE S S S SW SW SW SW SW SW Transp wind spd.12 12 12 16 16 16 21 21 21 21 21 21 Haines index....3 3 3 3 3 3 3 3 3 3 3 3 SDspl kt-ft/10005 5 5 21 21 21 121 121 121 95 95 95 $$ Forecaster...CYS Requested by...Test Type of request...WILDFIRE .TAG 2412299.0/RIW .DELDT 04/24/24 .FormatterVersion 2.0.0 .EMAIL lauren.gross@noaa.gov