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Spot Forecast
Issued by NWS Riverton, WY
Issued by NWS Riverton, WY
622 FNUS75 KRIW 171006 FWSRIW Spot Forecast for Fourmile...BLM-WY-HDD National Weather Service Riverton WY 406 AM MDT Sat Aug 17 2024 Forecast is based on forecast start time of 0700 MDT on August 17. If conditions become unrepresentative, contact the National Weather Service .DISCUSSION... Dry to start the day. Winds will be out of the southwest, increasing to 10 to 15 mph during the afternoon, with gusts around 20 mph. Models are showing a cluster of storms moving into southwest Wyoming later this afternoon. Chances increase after 1400L, with peak chances (about 60%) occurring between 1500L and 1800L. Strong wind around 40 mph is the main hazard with any storms. Storms will be coming from the southwest, so wind direction is favored from that direction initially, but would likely become more erratic as the storms pass through. Looking ahead, Sunday looks similar, with a southwest wind direction and around 20 mph afternoon gusts. Scattered showers and thunderstorms are possible (30%) during the afternoon. ...Thunderstorms imply strong gusty and erratic winds... ...Haines index is high level haines both day and night... .TODAY... Sky/weather.........Sunny (20-30 percent) then becoming mostly cloudy (80-90 percent) after 1400. Isolated showers and thunderstorms in the afternoon. CWR.................0 percent increasing to 15 percent in the afternoon. Chance of pcpn......60 percent. LAL.................1 until 1500, then 3. Max temperature.....Around 84. Min humidity........Around 20 percent. Wind (20 ft)........Light winds favoring a southwest direction until 1100. Then, winds southwest around 13 mph with gusts to around 20 mph in the afternoon. Likely southwest wind with gusts around 40 mph after 1600 with showers and thunderstorms. Gusty and erratic winds expected near thunderstorms in the afternoon. Ridgetop wind.......Southwest around 10 mph until 1000, then southwest around 20 mph until after 12000, then around 30 mph after 1600 with thunderstorms. Haines Index........6 decreasing to 4 in the afternoon. TIME (MDT) 7 AM 9 AM 11 AM 1 PM 3 PM 5 PM Sky (%).........10 5 5 30 80 90 Weather cov..... ISOLTD SCTTRD Weather type....NONE NONE NONE NONE RNSHWR RNSHWR Tstm cov........ ISOLTD SCTTRD CWR.............0 0 0 20 20 20 Chc of pcpn (%).0 0 0 0 30 50 LAL.............1 1 1 1 3 3 Temp............48 58 72 81 80 70 RH..............68 47 33 22 28 52 20 ft wind......SW 3 S 2 SW 9 SW 11 SW 11 SW 13 20 ft wind gust.4 13 16 16 18 Ridgetop wind...SW 10 S 5 SW 15 SW 20 SW 20 SW 20 Haines index....6 6 6 4 4 4 .TONIGHT... Sky/weather.........Mostly cloudy (70-80 percent) becoming partly cloudy (30-40 percent) after 2300. Isolated showers and thunderstorms early in the evening. CWR.................1 percent. Chance of pcpn......25 percent. LAL.................2 until 2100, then 1. Min temperature.....Around 50. Max humidity........Over 90 percent. Wind (20 ft)........Southwest to southeast winds around 10 mph with gusts to around 18 mph until 2100, then light favoring a west to southwest direction. Gusty and erratic winds expected near thunderstorms early in the evening. Ridgetop wind.......South 15 to 20 mph until 2000. West around 10 mph after 2400. Haines Index........2 to 3. TIME (MDT) 6 PM 8 PM 10 PM MIDNGT 2 AM 4 AM Sky (%).........90 75 60 45 35 30 Weather cov.....ISOLTD ISOLTD Weather type....RNSHWR RNSHWR NONE NONE NONE NONE Tstm cov........ISOLTD ISOLTD CWR.............0 0 0 0 0 0 Chc of pcpn (%).30 20 10 10 10 10 LAL.............2 2 1 1 1 1 Temp............70 65 59 55 53 51 RH..............53 63 77 89 91 97 20 ft wind......SW 11 SE 9 S 4 SW 4 W 3 SW 3 20 ft wind gust.16 13 6 6 4 4 Ridgetop wind...SW 20 SE 15 S 10 SW 10 W 10 SW 10 Haines index....2 2 2 3 3 3 .SUNDAY... Sky/weather.........Mostly sunny (30-40 percent). Scattered showers and thunderstorms in the afternoon. CWR.................10 percent. Chance of pcpn......30 percent. LAL.................1 until 1200, then 3. Max temperature.....Around 80. Min humidity........Around 34 percent. Wind (20 ft)........Light winds until 1300, then southwest 9 to 14 mph with gusts to around 20 mph. Gusty and erratic winds expected near thunderstorms in the afternoon. Ridgetop wind.......Northwest to north around 10 mph until 1100, then west 10 to 15 mph until 1500, then southwest 15 to 20 mph until 2000. Haines Index........3. TIME (MDT) 6 AM 8 AM 10 AM NOON 2 PM 4 PM Sky (%).........35 35 15 5 25 50 Weather cov..... SCTTRD SCTTRD SCTTRD Weather type....NONE NONE NONE RNSHWR RNSHWR RNSHWR Tstm cov........ SCTTRD SCTTRD SCTTRD CWR.............0 0 0 10 10 10 Chc of pcpn (%).0 0 0 30 30 30 LAL.............1 1 1 3 3 3 Temp............49 53 61 71 75 77 RH..............98 94 77 56 46 42 20 ft wind......NW 3 N 3 NW 2 SW 4 W 6 W 9 20 ft wind gust.4 4 6 10 13 Ridgetop wind...NW 10 N 10 NW 5 SW 10 W 15 W 15 Haines index....3 3 3 3 3 3 .FORECAST DAYS 3 THROUGH 5... .MONDAY... Partly cloudy. Chance of showers and thunderstorms. Lows in the lower 50s. Highs in the lower 80s. Southwest winds around 10 mph. .TUESDAY... Mostly clear. Lows in the upper 40s. Highs in the mid 80s. Southwest winds around 10 mph. .WEDNESDAY... Partly cloudy. Lows around 50. Highs in the lower 80s. Southwest winds around 15 mph. $$ Forecaster...Wittmann Requested by...Clarke Whitehead Type of request...WILDFIRE .TAG 2420426.0/RIW .DELDT 08/17/24 .FormatterVersion 2.0.0 .EMAIL cwhitehead@blm.gov