Updated: 3:48 am MDT on April 30, 2016
Partly cloudy. A 20 percent chance of rain showers in the morning. Highs 63 to 68. Breezy. Northwest winds 10 to 20 mph with gusts to 30 mph.
Partly cloudy. Lows 39 to 45. Breezy. Northwest winds 10 to 20 mph with gusts to 30 mph in the evening...becoming north up to 10 mph after midnight.
Mostly sunny. Highs 66 to 71. Breezy. Southeast winds 10 to 20 mph. Gusts to 30 mph in the afternoon.
Mostly clear. Lows 40 to 47. Southeast winds up to 10 mph.
Sunny. Highs 71 to 76. Southeast winds 10 to 15 mph. Gusts to 25 mph in the afternoon.
Mostly clear. Lows 41 to 51. Highs 71 to 79.
Mostly sunny. Highs 76 to 81.
Mostly cloudy. Lows 46 to 52.
Partly cloudy with a 20 percent chance of showers and thunderstorms. Highs 73 to 78.
Mostly cloudy with a 20 percent chance of rain showers. Lows 44 to 50.
Partly cloudy with a 20 percent chance of rain showers and thunderstorms. Highs 71 to 76.
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Area forecast discussion National Weather Service Boise Idaho 344 am MDT Sat Apr 30 2016 Short term...today through Sunday...a broad upper trough is situated over the western states early this morning with an upper ridge just off the coast. The main energy within the trough will shift south and east away from the forecast area today while a weak circulation located along the Montana and Idaho border moves south across the forecast area. This will bring a chance of showers to the area through this evening but mainly over the high terrain on the Idaho side. There may be just enough instability for an afternoon or early evening thunderstorm so kept a slight chance mention in the forecast. Surface pressure gradient remains fairly tight today and will again produce breezy conditions this afternoon and evening...especially across eastern Oregon the upper Treasure valley and Owyhee County. The upper ridge ridge just off the coast will build inland across the Pacific northwest and northern rockies through the weekend while a trough remains over the southwest states. This will bring a warming and drying trend to the forecast area under easterly flow aloft. Surface gradient relaxes on Sunday with downslope easterly flow at the surface aiding the warming trend for the Treasure valley. Long term...Sunday night through Friday...an upper ridge over the northern rockies will dominate on Monday. Southerly flow aloft will draw some limited moisture northward from Nevada for a slight chance of afternoon showers along the Nevada border and in the west central mountains. Otherwise...skies will be mostly clear with temperatures above normal. The ridge will slowly shift east as the next Pacific trough enters the west Tuesday and Wednesday. The shower chances will increase for the remainder of the week as the trough splits...forming a large upper closed low which is prognosticated to move into the southwestern U.S. And Great Basin by Friday. The warming trend will continue through midweek /near 80f in the lower valleys on Wednesday/...then cool slightly by the end of the week. && Aviation...mainly VFR. Isolated to scattered showers /mainly over the higher terrain/ of southwest Idaho and Baker County in southeast Oregon. Slight chance of thunderstorms after 18z. Showers will decrease in coverage and become isolated after 03z. Surface winds...northwest 10 knots or less increasing to 10-20 knots with gusts to 30 knots after 18z...diminishing after 03z. Winds aloft near 10k feet mean sea level...north 10-20 knots becoming east after 03z. Outlook for Sunday...isolated showers over the higher terrain of central Idaho and along the Nevada border after 18z...otherwise VFR with partly cloudy skies. && Hydrology...the Bruneau and Jarbidge rivers continue to run high in Owyhee County with some smaller tributaries likely running bankfull. Diurnal peaks for the East Fork of the Jarbidge River and the East Fork of the Bruneau River trended up again compared to the previous day. This will keep the Bruneau River at Hot Springs running high with the latest observation a little more than a foot below flood stage. No flooding is expected on the mainstem of the Bruneau...but a good high elevation snowpack remains in the Upper Basin and warming temperatures through the weekend and early next week will keep streamflows high. && Boi watches/warnings/advisories... Idaho...none. Or...none. && $$ Www.Weather.Gov/Boise www.Facebook.Com/nwsboise www.Twitter.Com/nwsboise Short term...tl long term....bw aviation.....Bw hydrology...tl