FNUS75 KRIW 042320 FWSRIW Spot Forecast for Life flight...NPS National Weather Service Riverton WY 520 PM MDT Mon May 4 2026 Forecast is based on forecast start time of 1800 MDT on May 04. If conditions become unrepresentative, contact the National Weather Service .DISCUSSION... A cold front has moved through the area earlier today. The frontal passage will keep winds from the north at around 5-10 mph this evening with a few periodic gusts near 15 mph. Clouds are expected to gradually build in over the next 1-3 hours. Precipitation chances should hold off until about 8-9 PM, after that a few isolated snow showers may be possible through the late evening hours Monday into early Tuesday morning. ...Thunderstorms imply strong gusty and erratic winds... .TONIGHT... Sky/weather.........Partly cloudy (40-50 percent) then becoming mostly cloudy (65-75 percent). Chance of pcpn......10 percent. Chance of thunder...4 percent. Min temperature.....Around 27. Max humidity........85 percent. Min apparent temp...24. Surface winds (mph).North at around 5-10 mph. Wind (20 ft)........Light winds. CEILING (KFT).......17 decreasing to 13 early in the evening, then decreasing to 11 late in the evening decreasing to 8.3 late in the evening decreasing to 7.0 decreasing to 5.8 overnight decreasing to 4.8 decreasing to 3.7 after 3 am increasing to 5.7 increasing to 7.8 early in the morning. TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM Sky (%).........35 35 50 60 60 70 75 70 65 60 40 30 Weather cov..... Weather type.... Tstm cov........ Chc of pcpn (%).10 10 10 10 0 0 10 0 0 10 0 0 Chc of thdr (%).0 0 0 0 0 0 0 0 0 0 0 0 Temp............55 51 47 43 40 37 36 34 33 32 30 29 RH..............36 44 53 66 72 76 77 80 81 85 84 84 Wind chill (F)..55 51 43 38 35 32 31 30 29 27 25 24 20 FT wind dir..N N N N N N N N N N N N 20 FT wind spd..6 6 6 5 4 4 4 4 4 4 4 4 20 FT wind gust.10 10 8 6 6 6 6 6 6 6 6 6 Surface wnd dir.N N N N N N N N N N N N Surface wnd spd.8 8 8 6 5 5 5 5 5 5 5 5 Surface wnd gst.13 13 10 8 8 8 7 7 7 7 7 8 Ceiling (kft)...17 13 14 11 11 8.3 7.0 5.8 4.8 3.7 5.7 7.8 .TUESDAY... Sky/weather.........Mostly sunny (35-45 percent). Chance of pcpn......10 percent. Chance of thunder...11 percent. Max temperature.....Around 40. Min humidity........30 percent. Min apparent temp...20. Surface winds (mph).Light winds until 0800, then north 9 to 14 mph with gusts to around 21 mph. Wind (20 ft)........North winds 7 to 11 mph with gusts to around 17 mph. CEILING (KFT).......6.9 increasing to 9.4 early in the morning, then decreasing to 8.4 late in the morning increasing to 9.4 late in the morning increasing to 10. TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM Sky (%).........30 25 20 20 20 25 35 35 30 50 55 50 Weather cov..... ISO ISO ISO Weather type.... SW SW SW Tstm cov........ ISO ISO ISO Chc of pcpn (%).0 0 0 0 0 0 0 0 10 10 10 10 Chc of thdr (%).0 0 0 0 0 0 0 0 10 10 10 10 Temp............28 27 29 32 36 38 39 39 39 39 38 37 RH..............85 80 74 62 50 41 36 33 32 31 31 31 Wind chill (F)..23 20 20 24 29 31 31 31 31 31 30 28 20 FT wind dir..N N N N N N N N N N N N 20 FT wind spd..4 5 7 8 8 9 10 10 11 11 11 11 20 FT wind gust.6 7 11 13 13 14 16 16 17 17 17 17 Surface wnd dir.N N N N N N N N N N N N Surface wnd spd.5 6 9 10 10 11 13 13 14 14 14 14 Surface wnd gst.8 9 14 16 16 17 20 20 21 21 21 21 Ceiling (kft)...7.6 6.9 9.4 8.4 9.4 12 11 10 10 10 11 11 $$ Forecaster...Dziewaltowski Requested by...Laura Dooley Type of request...SAR .TAG 2612698.0/RIW .DELDT 05/04/26 .FormatterVersion 2.0.0 .EMAIL laura.dooley@nps.gov