Area Forecast Discussion
Issued by NWS Boise, ID

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000 FXUS65 KBOI 190831 AFDBOI Area Forecast Discussion National Weather Service Boise ID 231 AM MDT Mon Apr 19 2021 .SHORT TERM...Today through Wednesday night...A strong cold front will cross our area from the north this morning, followed this afternoon by northwest winds 15-30 mph bringing much cooler air from western Canada. Strongest winds will be in the Snake River Valley southeast of Boise, where gusts over 40 mph are possible. So a wind advisory is in effect for southwest Idaho, from noon today until 6 pm MDT this evening. The front will be dry except for isolated showers east of McCall. Today will be 10-15 degrees cooler than Sunday, which is actually near normal for mid April. Winds will diminish this evening. With clear skies, temperatures will drop below freezing tonight and Tuesday night in the mountains, the Magic Valley, and most of eastern Oregon. A warming trend will start on Wednesday as an upper-level high pressure ridge approaches the coast. .LONG TERM...Thursday through Monday...Thursday through Monday...An upper trough moving through the northern Rockies on Thursday will bring a chance of precipitation to the West Central Mountains on Thursday, otherwise a dry northwesterly flow aloft will prevail as an upper ridge resides near the coast. The ridge will slowly work inland through Friday. A weak disturbance moving through the ID panhandle may clip the West Central Mountains for a slight chance of showers on Friday, otherwise expect dry conditions. Temperatures both Thursday and Friday will be warm, with highs around 5 to 10 degrees above normal. A pattern change looks more certain over the weekend. The latest models are coming into better agreement as the persistent ridge along the coast weakens and shifts east and is replaced with an upper trough. Precipitation may reach our area by Saturday, with a chance of precip continuing through early next week. It has been a dry month so far, with just a trace reported at the Boise Airport. Above-normal temperatures over the weekend will cool to near normal on Monday. && .AVIATION...VFR. Isolated showers east of KMYL. Surface winds: generally northwest less than 12 kt, increasing to 15 to 25 kt after 15Z. Areas to the south and east of KBOI, winds increasing to 20 to 30 knots with gusts to around 40 kt after 18Z. Winds aloft at 10k feet MSL: north to northwest 25-35 kt. && .BOI WATCHES/WARNINGS/ADVISORIES... ID...Wind Advisory from noon today to 6 PM MDT this evening IDZ014>016-029-030. OR...None. && $$ SHORT TERM...JT LONG TERM....BW AVIATION.....BW is the U.S. government's official web portal to all federal, state and local government web resources and services.