Area Forecast Discussion
Issued by NWS Missoula, MT
Issued by NWS Missoula, MT
815 FXUS65 KMSO 081906 AFDMSO Area Forecast Discussion National Weather Service Missoula MT 106 PM MDT Mon Jul 8 2024 .DISCUSSION...A strong ridge of high pressure will continue to build over the Northern Rockies through mid week. This ridge will cause extremely warm temperatures with Wednesday being the hottest day of the week. Temperatures for Wednesday will be approaching daily record values, especially across north central Idaho. A subtle disturbance will pass through the region on Thursday causing the ridge to flatten. This feature will cause temperatures to cool slightly, around 5 degrees, but afternoon readings will still be extremely warm for this time of year. The disturbance will also cause increased westerly winds Thursday afternoon and evening. The combination of winds and low humidity readings will be approaching critical fire weather conditions. The ridge axis nudges to the east Friday into the weekend. This shift in the ridge will place the Northern Rockies in subtle southwesterly flow aloft. This flow appears to allow some monsoonal moisture to make its way up into the region by Saturday afternoon causing isolated high-based storms over southwest Montana and Lemhi County. && .AVIATION...VFR conditions the next 24 hours through 09/1200z. && .MSO WATCHES/WARNINGS/ADVISORIES... MT...Heat Advisory from 1 PM Tuesday to midnight MDT Friday night for Flathead/Mission Valleys...Kootenai/Cabinet Region...Lower Clark Fork Region...Missoula/Bitterroot Valleys. ID...Heat Advisory from noon Tuesday to 11 PM PDT Friday for Northern Clearwater Mountains. Excessive Heat Warning from noon Tuesday to 11 PM PDT Friday for Orofino/Grangeville Region...Southern Clearwater Mountains. Excessive Heat Warning until 11 PM PDT Friday for Lower Hells Canyon/Salmon River Region. && $$