Area Forecast Discussion
Issued by NWS Missoula, MT
Issued by NWS Missoula, MT
591 FXUS65 KMSO 140843 AFDMSO Area Forecast Discussion National Weather Service Missoula MT 243 AM MDT Sun Jul 14 2024 .DISCUSSION...The Northern Rockies will remain under westerly flow aloft into Monday on the tail end of an upper level jet streak. Hot and dry conditions will continue, along with increased westerly winds this afternoon and again on Monday afternoon. Meanwhile, a closed system of low pressure is spinning off the coast of northern California. This system will send Pacific moisture northeast. The result will be chances for showers and thunderstorms in Lemhi County and southwest Montana this afternoon and again on Monday afternoon. A dry, unstable lower atmosphere will mean strong outflow winds of about 30-40 mph from any thunderstorms that develop. By Tuesday afternoon, the broad, flat ridge bringing westerly flow will amplify, putting the Northern Rockies under a more well- formed ridge once again. Daytime high temperatures will bounce back up for the second half of this week. Temperatures for the lower Salmon, Snake, and Clearwater River valleys will be back up in the neighborhood of 110 degrees, while the Missoula/Bitterroot Valleys, Lower Clark Fork, and Kootenai regions will see the upper 90s and flirt with triple digits. && .AVIATION...Pacific moisture entering the Northern Rockies airspace this afternoon will bring about a 10-20 percent chance for showers and thunderstorms to KSMN, KHRF, and KBTM after about 14/1900Z. Thunderstorms that develop will be capable of erratic gusts of about 30-40 knots. All terminals will experience an increase in westerly winds this afternoon to about 15-25 knots by about 14/20000Z. && .MSO WATCHES/WARNINGS/ADVISORIES... MT...None. ID...Heat Advisory until 10 PM PDT this evening for Lower Hells Canyon/Salmon River Region. && $$