703 FNUS55 KBOI 011419 FWFBOI Fire Weather Planning Forecast for SW Idaho and SE Oregon National Weather Service Boise ID 819 AM MDT Sun Oct 1 2023 ...RAIN AND HIGH MOUNTAIN SNOW THROUGH MONDAY NIGHT... ...DRY AND MILD CONDITIONS MIDWEEK THROUGH NEXT WEEKEND... .DISCUSSION... A low pressure system moving through the northern Great Basin will keep the chance of rain and high mountain snow over the area through Monday. The heaviest precipitation will lineup over far southeast Oregon and much of southwest Idaho. Snow levels will hold between 7000 and 8500 feet. Showers linger in the mountains on Tuesday as a weak system tracks through the region on northwest flow. Dry and mild conditions set up for all areas by Wednesday and will continue through the next weekend as high pressure builds in from the coast. The stable conditions and light winds under the high pressure will impact ventilation. IDZ401-402-012230- Western Payette National Forest-Eastern Payette National Forest- 819 AM MDT Sun Oct 1 2023 .TODAY... Sky/weather.........Mostly cloudy with numerous rain showers. Chance of showers 60 percent. Max temperature.....39 to 50. 24 hr trend......On average, unchanged. Min humidity........71 to 90 percent. 24 hr trend......On average, 8 percent wetter. 20-foot winds....... Valleys/lwr slopes...North 9 to 15 mph with gusts to 24 mph. Ridges/upr slopes....North 9 to 15 mph with gusts to 24 mph. Haines Index........2 very low. LAL.................1. CWR /0.10 inch/.....40 percent. Smoke Dispersal: Mixing Height......1500-2000 ft AGL. Transport Winds....North 10 to 20 mph. .TONIGHT... Sky/weather.........Mostly cloudy. Rain showers likely, decreasing after midnight. Chance of showers 60 percent. Min temperature.....35 to 44. 24 hr trend......On average, unchanged. Max humidity........85 to 99 percent. 24 hr trend......On average, 9 percent wetter. 20-foot winds....... Valleys/lwr slopes...North 8 to 9 mph with gusts to 16 mph in the evening, becoming light downslope less than 8 mph after midnight. Ridges/upr slopes....North 8 to 9 mph with gusts to 16 mph in the evening, becoming light after midnight. Haines Index........2 very low. LAL.................1. CWR /0.10 inch/.....30 percent. Smoke Dispersal: Mixing Height......400-500 ft AGL. Transport Winds....North 5 to 10 mph. .MONDAY... Sky/weather.........Mostly cloudy with a 40 percent chance of rain and snow showers. Max temperature.....40 to 55. 24 hr trend......On average, 2 degrees warmer. Min humidity........63 to 88 percent. 24 hr trend......On average, 5 percent drier. 20-foot winds....... Valleys/lwr slopes...Light upslope winds less than 8 mph. Ridges/upr slopes....Light winds less than 8 mph in the morning, becoming west around 8 mph in the afternoon. Haines Index........2 very low. LAL.................1. CWR /0.10 inch/.....20 percent. Smoke Dispersal: Mixing Height......2000-3000 ft AGL. Transport Winds....West 5 to 10 mph. $$ = IDZ403-012230- Northern Boise National Forest- 819 AM MDT Sun Oct 1 2023 .TODAY... Sky/weather.........Numerous rain showers in the morning, then widespread rain showers and isolated thunderstorms in the afternoon. Chance of precipitation 90 percent. Max temperature.....41 to 51. 24 hr trend......On average, 3 degrees cooler. Min humidity........74 to 87 percent. 24 hr trend......On average, 17 percent wetter. 20-foot winds....... Valleys/lwr slopes...North 8 to 9 mph with gusts to 16 mph in the morning, becoming light upslope less than 8 mph in the afternoon. Ridges/upr slopes....Northeast 8 to 10 mph in the morning, becoming light in the afternoon. Gusts to 18 mph. Haines Index........2 very low. LAL.................1 in the morning, increasing to 2 in the afternoon. CWR /0.10 inch/.....70 percent. Smoke Dispersal: Mixing Height......1500-2500 ft AGL. Transport Winds....Northeast 5 to 10 mph. .TONIGHT... Sky/weather.........Rain showers and a slight chance of thunderstorms in the evening, then a chance of rain and snow showers after midnight. Chance of precipitation 80 percent. No snow accumulation. Min temperature.....35 to 43. 24 hr trend......On average, unchanged. Max humidity........89 to 100 percent. 24 hr trend......On average, 12 percent wetter. 20-foot winds....... Valleys/lwr slopes...Light downslope winds less than 8 mph. Ridges/upr slopes....Light winds less than 8 mph. Haines Index........2 very low. LAL.................2 in the evening, decreasing to 1 after midnight. CWR /0.10 inch/.....40 percent. Smoke Dispersal: Mixing Height......500-700 ft AGL. Transport Winds....North up to 5 mph. .MONDAY... Sky/weather.........Mostly cloudy with a chance of rain and snow showers, mainly in the afternoon. Chance of precipitation 40 percent. Max temperature.....40 to 53. 24 hr trend......On average, unchanged. Min humidity........71 to 88 percent. 24 hr trend......On average, unchanged. 20-foot winds....... Valleys/lwr slopes...Light upslope winds less than 8 mph. Ridges/upr slopes....Light winds less than 8 mph. Haines Index........2 very low. LAL.................1. CWR /0.10 inch/.....20 percent. Smoke Dispersal: Mixing Height......2000-3000 ft AGL. Transport Winds....West around 10 mph. $$ = IDZ421-012230- Southern Boise National Forest/Western Sawtooth National Forest- 819 AM MDT Sun Oct 1 2023 .TODAY... Sky/weather.........Widespread rain showers. Isolated thunderstorms in the afternoon. Chance of precipitation near 100 percent. Max temperature.....45 to 52, except 40 to 45 above 6500 feet. 24 hr trend......On average, 9 degrees cooler. Min humidity........75 to 85 percent, except 81 to 90 percent above 6500 feet. 24 hr trend......On average, 21 percent wetter. 20-foot winds....... Valleys/lwr slopes...East around 8 mph in the morning, becoming light upslope less than 8 mph in the afternoon. Ridges/upr slopes....Light winds less than 8 mph. Haines Index........2 very low. LAL.................1 in the morning, increasing to 2 in the afternoon. CWR /0.10 inch/.....80 percent. Smoke Dispersal: Mixing Height......1500-2000 ft AGL. Transport Winds....South 5 to 10 mph. .TONIGHT... Sky/weather.........Rain showers and a slight chance of thunderstorms in the evening, then a chance of rain and snow showers after midnight. Chance of precipitation 80 percent. No snow accumulation. Min temperature.....37 to 44, except 34 to 39 above 6500 feet. 24 hr trend......On average, 3 degrees cooler. Max humidity........92 to 100 percent. 24 hr trend......On average, 13 percent wetter. 20-foot winds....... Valleys/lwr slopes...South around 8 mph in the evening, becoming light downslope less than 8 mph after midnight. Ridges/upr slopes....Light winds less than 8 mph. Haines Index........2 very low. LAL.................2 in the evening, decreasing to 1 after midnight. CWR /0.10 inch/.....40 percent. Smoke Dispersal: Mixing Height......500-800 ft AGL. Transport Winds....West up to 5 mph. .MONDAY... Sky/weather.........Mostly cloudy. A chance of rain and snow showers, mainly in the afternoon. Chance of precipitation 30 percent. Max temperature.....47 to 57, except 40 to 48 above 6500 feet. 24 hr trend......On average, 4 degrees warmer. Min humidity........62 to 79 percent, except 71 to 88 percent above 6500 feet. 24 hr trend......On average, 9 percent drier. 20-foot winds....... Valleys/lwr slopes...Light upslope winds less than 8 mph in the morning, becoming west 8 to 14 mph in the afternoon. Ridges/upr slopes....Light winds less than 8 mph in the morning, becoming west 8 to 13 mph in the afternoon. Haines Index........2 very low. LAL.................1. CWR /0.10 inch/.....20 percent. Smoke Dispersal: Mixing Height......2500-3500 ft AGL. Transport Winds....West 10 to 15 mph. $$ = IDZ400-012230- Northern Boise BLM- 819 AM MDT Sun Oct 1 2023 .TODAY... Sky/weather.........Mostly cloudy with numerous rain showers. Isolated thunderstorms in the afternoon. Chance of precipitation 70 percent. Max temperature.....51 to 59. 24 hr trend......On average, 3 degrees cooler. Min humidity........56 to 71 percent. 24 hr trend......On average, 5 percent wetter. 20-foot winds....... Valleys/lwr slopes...North 12 to 18 mph with gusts to 28 mph. Ridges/upr slopes....Northwest 12 to 18 mph with gusts to 32 mph. Haines Index........2 very low. LAL.................1 in the morning, increasing to 2 in the afternoon. CWR /0.10 inch/.....40 percent. Smoke Dispersal: Mixing Height......1500-2000 ft AGL. Transport Winds....North 10 to 25 mph. .TONIGHT... Sky/weather.........Mostly cloudy. A chance of rain showers, mainly in the evening. Chance of showers 30 percent. Min temperature.....43 to 48. 24 hr trend......On average, unchanged. Max humidity........82 to 96 percent. 24 hr trend......On average, 16 percent wetter. 20-foot winds....... Valleys/lwr slopes...North 8 to 10 mph with gusts to 18 mph in the evening, becoming light downslope less than 8 mph after midnight. Ridges/upr slopes....Northwest 8 to 11 mph. Gusts to 20 mph in the evening. Haines Index........2 very low. LAL.................1. CWR /0.10 inch/.....30 percent. Smoke Dispersal: Mixing Height......300-400 ft AGL. Transport Winds....Northwest 5 to 15 mph. .MONDAY... Sky/weather.........Mostly cloudy. Max temperature.....54 to 64. 24 hr trend......On average, 5 degrees warmer. Min humidity........50 to 67 percent. 24 hr trend......On average, 6 percent drier. 20-foot winds....... Valleys/lwr slopes...Light upslope winds less than 8 mph. Ridges/upr slopes....Light winds less than 8 mph. Haines Index........2 very low. LAL.................1. CWR /0.10 inch/.....0 percent. Smoke Dispersal: Mixing Height......3000-4000 ft AGL. Transport Winds....West 5 to 10 mph. $$ = IDZ420-424-012230- Treasure Valley BLM-Western Twin Falls BLM- 819 AM MDT Sun Oct 1 2023 .TODAY... Sky/weather.........Widespread rain showers in the morning, then numerous rain showers and isolated thunderstorms in the afternoon. Chance of precipitation 90 percent. Max temperature.....50 to 55. 24 hr trend......On average, 9 degrees cooler. Min humidity........64 to 78 percent. 24 hr trend......On average, 15 percent wetter. 20-foot winds....... Valleys/lwr slopes...West 8 to 14 mph. Gusts to 22 mph in the morning. Ridges/upr slopes....Light winds less than 8 mph in the morning, becoming south around 8 mph in the afternoon. Haines Index........2 very low. LAL.................1 in the morning, increasing to 2 in the afternoon. CWR /0.10 inch/.....70 percent. Smoke Dispersal: Mixing Height......1500-2000 ft AGL. Transport Winds....West 5 to 15 mph. .TONIGHT... Sky/weather.........Mostly cloudy. Rain showers likely and a slight chance of thunderstorms in the evening, then a chance of rain showers after midnight. Chance of precipitation 70 percent. Min temperature.....43 to 48. 24 hr trend......On average, 2 degrees cooler. Max humidity........88 to 96 percent. 24 hr trend......On average, 12 percent wetter. 20-foot winds....... Valleys/lwr slopes...West around 8 mph in the evening, becoming light downslope less than 8 mph after midnight. Ridges/upr slopes....Light winds less than 8 mph. Haines Index........2 very low. LAL.................2 in the evening, decreasing to 1 after midnight. CWR /0.10 inch/.....30 percent. Smoke Dispersal: Mixing Height......300-700 ft AGL. Transport Winds....West 5 to 10 mph. .MONDAY... Sky/weather.........Mostly cloudy. A 20 percent chance of rain showers in the morning. Max temperature.....57 to 64. 24 hr trend......On average, 8 degrees warmer. Min humidity........51 to 63 percent. 24 hr trend......On average, 15 percent drier. 20-foot winds....... Valleys/lwr slopes...Light upslope winds less than 8 mph in the morning, becoming west 8 to 14 mph in the afternoon. Ridges/upr slopes....Light winds less than 8 mph in the morning, becoming west 10 to 16 mph in the afternoon. Haines Index........2 very low. LAL.................1. CWR /0.10 inch/.....10 percent. Smoke Dispersal: Mixing Height......3000-4000 ft AGL. Transport Winds....West 5 to 20 mph. $$ = IDZ423-426-012230- Owyhee Mountains-Southern Highlands- 819 AM MDT Sun Oct 1 2023 .TODAY... Sky/weather.........Widespread rain showers in the morning, then numerous rain showers and isolated thunderstorms in the afternoon. Chance of precipitation 90 percent. Max temperature.....44 to 53. 24 hr trend......On average, 8 degrees cooler. Min humidity........68 to 79 percent. 24 hr trend......On average, 13 percent wetter. 20-foot winds....... Valleys/lwr slopes...Northwest 9 to 15 mph. Gusts to 24 mph in the morning. Ridges/upr slopes....Northwest 9 to 15 mph. Gusts to 22 mph in the morning. Haines Index........2 very low. LAL.................1 in the morning, increasing to 2 in the afternoon. CWR /0.10 inch/.....70 percent. Smoke Dispersal: Mixing Height......1500-2500 ft AGL. Transport Winds....West 10 to 15 mph. .TONIGHT... Sky/weather.........Mostly cloudy. Rain showers likely and a slight chance of thunderstorms in the evening, then a chance of rain showers after midnight. Chance of precipitation 60 percent. Min temperature.....38 to 45. 24 hr trend......On average, unchanged. Max humidity........89 to 97 percent. 24 hr trend......On average, 6 percent wetter. 20-foot winds....... Valleys/lwr slopes...West around 9 mph. Ridges/upr slopes....Northwest around 9 mph. Haines Index........2 very low. LAL.................2 in the evening, decreasing to 1 after midnight. CWR /0.10 inch/.....30 percent. Smoke Dispersal: Mixing Height......400-900 ft AGL. Transport Winds....Northwest 5 to 10 mph. .MONDAY... Sky/weather.........Mostly cloudy with a 30 percent chance of rain showers. Max temperature.....49 to 61. 24 hr trend......On average, 6 degrees warmer. Min humidity........53 to 68 percent. 24 hr trend......On average, 13 percent drier. 20-foot winds....... Valleys/lwr slopes...Light upslope winds less than 8 mph in the morning, becoming northwest 8 to 13 mph in the afternoon. Ridges/upr slopes....Light winds less than 8 mph in the morning, becoming west 8 to 12 mph in the afternoon. Haines Index........2 very low. LAL.................1. CWR /0.10 inch/.....20 percent. Smoke Dispersal: Mixing Height......3000-4000 ft AGL. Transport Winds....West around 15 mph. $$ = ORZ646-012230- Baker Valley- 719 AM PDT Sun Oct 1 2023 .TODAY... Sky/weather.........Partly cloudy. Scattered rain showers, mainly in the afternoon. Chance of showers 30 percent. Max temperature.....49 to 57. 24 hr trend......On average, 2 degrees warmer. Min humidity........56 to 67 percent. 24 hr trend......On average, 4 percent drier. 20-foot winds....... Valleys/lwr slopes...Northwest 14 to 20 mph with gusts to 30 mph. Ridges/upr slopes....Northwest 14 to 20 mph with gusts to 30 mph. Haines Index........2 very low. LAL.................1. CWR /0.10 inch/.....10 percent. .TONIGHT... Sky/weather.........Mostly cloudy. A 20 percent chance of rain showers in the evening. Min temperature.....39 to 46. 24 hr trend......On average, unchanged. Max humidity........75 to 88 percent. 24 hr trend......On average, unchanged. 20-foot winds....... Valleys/lwr slopes...Northwest 9 to 15 mph. Gusts to 24 mph in the evening. Ridges/upr slopes....Northwest 9 to 15 mph. Gusts to 24 mph in the evening, decreasing to 16 mph after midnight. Haines Index........2 very low. LAL.................1. CWR /0.10 inch/.....10 percent. .MONDAY... Sky/weather.........Partly sunny. Max temperature.....55 to 64. 24 hr trend......On average, 6 degrees warmer. Min humidity........41 to 50 percent. 24 hr trend......On average, 16 percent drier. 20-foot winds....... Valleys/lwr slopes...Light upslope winds less than 8 mph in the morning, becoming west 8 to 9 mph in the afternoon. Ridges/upr slopes....Light winds less than 8 mph in the morning, becoming west around 8 mph in the afternoon. Haines Index........2 very low. LAL.................1. CWR /0.10 inch/.....0 percent. $$ = ORZ636-637-012230- Burns BLM-Vale BLM- 819 AM MDT Sun Oct 1 2023 /719 AM PDT Sun Oct 1 2023/ .TODAY... Sky/weather.........Widespread rain and snow showers in the morning, then numerous rain showers in the afternoon. Chance of precipitation 80 percent. No snow accumulation. Max temperature.....45 to 56. 24 hr trend......On average, 2 degrees cooler. Min humidity........49 to 69 percent. 24 hr trend......On average, 3 percent drier. 20-foot winds....... Valleys/lwr slopes...Northwest 11 to 17 mph with gusts to 26 mph. Ridges/upr slopes....Northwest 12 to 18 mph with gusts to 26 mph. Haines Index........2 very low. LAL.................1. CWR /0.10 inch/.....40 percent. .TONIGHT... Sky/weather.........Mostly cloudy with a 50 percent chance of rain showers. Min temperature.....34 to 46. 24 hr trend......On average, unchanged. Max humidity........77 to 93 percent. 24 hr trend......On average, 4 percent wetter. 20-foot winds....... Valleys/lwr slopes...Northwest 8 to 13 mph. Gusts to 20 mph in the evening. Ridges/upr slopes....Northwest 8 to 13 mph. Haines Index........2 very low. LAL.................1. CWR /0.10 inch/.....20 percent. .MONDAY... Sky/weather.........Mostly cloudy. Max temperature.....53 to 64. 24 hr trend......On average, 8 degrees warmer. Min humidity........36 to 50 percent. 24 hr trend......On average, 16 percent drier. 20-foot winds....... Valleys/lwr slopes...West 8 to 12 mph. Ridges/upr slopes....West 8 to 13 mph. Haines Index........2 very low. LAL.................1. CWR /0.10 inch/.....0 percent. $$ = .FORECAST DAYS 3 THROUGH 7... .TUESDAY...Mostly cloudy. A 40 percent chance of showers. Lows 37 to 47. Highs 50 to 65. West winds 10 to 15 mph with gusts to 25 mph. .WEDNESDAY...Partly cloudy. Lows 31 to 42. Highs 54 to 68. Northwest winds 10 to 15 mph with gusts to 25 mph. .THURSDAY...Mostly clear. Lows 35 to 44. Highs 59 to 71. North winds around 10 mph. .FRIDAY...Mostly clear. Lows 36 to 45. Highs 60 to 73. .SATURDAY...Mostly clear. Lows 37 to 47. Highs 61 to 75. $$ =