Area Forecast Discussion
Issued by NWS Boise, ID
Issued by NWS Boise, ID
948 FXUS65 KBOI 050920 AFDBOI Area Forecast Discussion National Weather Service Boise ID 320 AM MDT Fri Jul 5 2024 .SHORT TERM...Today through Sunday night...An anomalously strong upper high pressure ridge remains near the west coast through the weekend with a dry northwest flow residing over SE Oregon and SW Idaho. A couple of weak upper troughs moving through the northern Rockies will enhance the winds across south-central Idaho, especially Saturday afternoon with gusts to around 30 mph. Moisture associated with both of these troughs will track to far to the east for any showers in our area. Temperatures are expected to be hottest compared to normal across SE Oregon due to the closer proximity to the ridge with highs in the 90s to around 100 degrees. An Excessive Heat Watch remains in effect for SE Oregon and far SW Idaho this weekend. .LONG TERM...Monday through Friday...The heat expands further eastward and northward with the building ridge to our west as it moves closer each day through midweek. Widespread hot temperatures well above 100 degrees are forecast for the lower valleys by Tuesday, and above 105 degrees Wednesday and Thursday. Many locations are likely to receive record or near record highs. An Excessive Heat Watch is in effect for all of SE Oregon and SW Idaho, including the mountain valleys where highs are forecast to be well into the 90s. The heat wave will likely continue through the end of the week, although limited monsoon moisture arriving from the south could bring some clouds to alleviate the hottest temps. Dry conditions prevail through the week, although any increase in monsoon moisture would result in at least a slight chance (<25 percent) of showers/thunderstorms toward the latter half of the week. && .AVIATION...VFR under clear skies. Surface winds: variable less than 10 kt becoming W to NW 5-15 kt with gusts to 20 kt after 18Z. Winds aloft at 10kft MSL: NW 10-20 kt. KBOI...VFR under clear skies. Variable or southeast winds 3-6 kt becoming W to NW 5-15 kt with gusts to 20 kt after 18Z. Weekend Outlook...VFR and mostly clear. High density altitude due to hot temperatures. Variable winds less than 10 kt during the late evenings through mornings, and generally NW 5-15 kt with gusts of 15- 25 kt during the afternoons and early evenings. && .BOI WATCHES/WARNINGS/ADVISORIES... ID...Excessive Heat Watch from Tuesday afternoon through Thursday evening IDZ011-013-028. Excessive Heat Watch from Saturday afternoon through Thursday evening IDZ012-029. Fire Weather Watch this evening IDZ424-426. Excessive Heat Watch from Monday afternoon through Thursday evening IDZ014>016-030-033. OR...Excessive Heat Watch from Saturday afternoon through Thursday evening ORZ061>064. && $$ www.weather.gov/Boise Interact with us via social media: www.facebook.com/NWSBoise www.twitter.com/NWSBoise SHORT TERM...BW LONG TERM....BW AVIATION.....BW