ESFMSO What: Widespread moderate rainfall over a prolonged period of time. Storm total amounts between 1 to 3 inches for valleys and 2 to 4 inches for the mountains. Where: Flathead and Lake Counties in northwest Montana, including Glacier National Park. Timing: Beginning Sunday afternoon, continuing through Monday night. Significant rainfall totals will bring potential for rapid rises on streams and creeks, rock and debris slides and runoff issues in poor drainage areas. Those recreating in the backcountry should take caution on backcountry roadways for falling debris. If camping, be mindful of where you park your RV or pitch your tent. Avoid setting up near water's edge, as streams and reservoirs could rise rapidly and flood your site.
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WHAT: Flash flooding caused by excessive rainfall is possible.
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WHERE: Portions of northwest and west central Montana, including the following areas, in northwest Montana, foothills and higher terrain from the West Glacier Region to Mission Mountains.
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WHEN: From 3 PM MDT this afternoon through late tonight.
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IMPACTS: Excessive runoff may result in flooding of creeks, streams, and other low-lying and flood-prone locations. Creeks and streams may rise out of their banks. High country mudslides are possible, especially near steep terrain which could endanger hikers. The upper portions of the Going-To-The-Sun Road is vulnerable to rockfall or debris flow.
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ADDITIONAL DETAILS:
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Anomalous subtropical moisture combined with a slow-moving weather front will trigger moderate to heavy rainfall rates over the region by late Sunday afternoon into the evening hours. High resolution weather models depict rain-rates exceeding 0.30 to 0.50 inches per hour in the mountains. With a lot of people recreating and camping in the region, this could become very dangerous very quickly.
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* WHAT...Flash flooding caused by excessive rainfall is possible. * WHERE...Portions of northwest and west central Montana, including the following areas, in northwest Montana, foothills and higher terrain from the West Glacier Region to Mission Mountains. * WHEN...From 3 PM MDT this afternoon through late tonight. * IMPACTS...Excessive runoff may result in flooding of creeks, streams, and other low-lying and flood-prone locations. Creeks and streams may rise out of their banks. High country mudslides are possible, especially near steep terrain which could endanger hikers. The upper portions of the Going-To-The-Sun Road is vulnerable to rockfall or debris flow. * ADDITIONAL DETAILS... - Anomalous subtropical moisture combined with a slow-moving weather front will trigger moderate to heavy rainfall rates over the region by late Sunday afternoon into the evening hours. High resolution weather models depict rain-rates exceeding 0.30 to 0.50 inches per hour in the mountains. With a lot of people recreating and camping in the region, this could become very dangerous very quickly. - Https://www.weather.gov/mso/hydrology
You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued.
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