RSS feed source: US National Weather Service

ESFMSO Where: Lemhi, Idaho, and Clearwater Counties in Idaho Ravalli, Mineral, Missoula, Granite, Deer Lodge, Powell, and Silverbow Counties in Montana What: Confidence continues to trend higher that Monsoon moisture will be spreading north into the Northern Rockies by Wednesday, bringing a chance for scattered thunderstorms. These thunderstorms will be capable of producing rain rates in excess of one half inch per hour. The result will be the potential for rock and debris slides in steep terrain along Forest Service roads and recent burn scar areas, as well as Highway 93 from Riggins to Whitebird in Idaho and Skalkaho Road in Montana. Consider delaying any backcountry travel for Wednesday and Thursday

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RSS feed source: US National Weather Service

A surge of deep monsoonal moisture combined with a slow-moving upper trough will bring periods of heavy showers and thunderstorms across the region. This airmass contains anomalously high moisture content, supporting the potential for excessive rainfall. Flash flooding will be possible, especially in steep terrain, narrow canyons, and near recent burn scars where soils are less able to absorb rainfall. The greatest risk will be Tuesday afternoon through Wednesday evening as repeated rounds of storms move through. * WHAT…Flash flooding caused by excessive rainfall is possible. * WHERE…Portions of Idaho, including the following areas, Boise Mountains, Camas Prairie, Lower Treasure Valley, Owyhee Mountains, Southern Twin Falls County, Southwest Highlands, Upper Treasure

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* WHAT…Temperatures as low as 34 will result in frost formation. * WHERE…Central and North St. Louis, and Northern Cook and Lake Counties. This includes the Tribal Lands of the Bois Forte Band, Lake Vermilion and, Nett Lake areas. Other locations including Voyageurs National Park. The entire Boundary Waters is also included. * WHEN…From 3 AM to 9 AM CDT Tuesday. * IMPACTS…Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered.

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* WHAT…Dangerous rip currents. * WHERE…Coastal Palm Beach County. * WHEN…Through Tuesday morning. * IMPACTS…Rip currents can sweep even the best swimmers away from shore into deeper water.

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