ESFMSO What: Widespread moderate rainfall over a prolonged period of time. Storm total amounts between 1 to 3 inches for valleys and 2 to 3 inches for the mountains. There is a 10 percent chance of isolated rainfall amounts up to 4 inches along the Continental Divide. Where: Flathead and Lake Counties in northwest Montana, including Glacier National Park. Missoula county in west-central Montana. Timing: Beginning Sunday morning, continuing through Monday night. Heaviest rainfall rates anticipated Monday into 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.
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WHAT: 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, Flathead/Mission Valleys and West Glacier Region. In west central Montana, Potomac/Seeley Lake Region.
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WHEN: From 3 PM MDT this afternoon through Tuesday morning.
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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. Flooding may occur in poor drainage and urban areas.
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ADDITIONAL DETAILS:
- Thunderstorms capable of rainfall rates of 0.75" to 1.00" per hour are possible this afternoon and evening (Sept 6), which could lead to localized debris flows.
This period will then be followed by prolonged moderate to heavy rainfall Monday into Tuesday morning of an additional 1 to 3 inches in the valleys, with 2 to 4 inches in the higher terrain, especially along the Continental Divide and in Glacier National Park.
* WHAT...Flooding caused by excessive rainfall is possible. * WHERE...Portions of northwest and west central Montana, including the following areas, in northwest Montana, Flathead/Mission Valleys and West Glacier Region. In west central Montana, Potomac/Seeley Lake Region. * WHEN...From 3 PM MDT this afternoon through Tuesday morning. * 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. Flooding may occur in poor drainage and urban areas. * ADDITIONAL DETAILS... - Thunderstorms capable of rainfall rates of 0.75" to 1.00" per hour are possible this afternoon and evening (Sept 6), which could lead to localized debris flows. This period will then be followed by prolonged moderate to heavy rainfall Monday into Tuesday morning of an additional 1 to 3 inches in the valleys, with 2 to 4 inches in the higher terrain, especially along the Continental Divide and in Glacier National Park. - https://www.weather.gov/mso/hydrology
You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop.
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