Heavy-moderate rain combined with high elevation snowmelt. Terrain induced storms Monday afternoon will cause locally much heavier rainfall. Flows in rivers may quickly increase and reach critical levels. There is potential for mud and rockslides.
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WHAT: Flooding caused by excessive rainfall and snowmelt is possible.
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WHERE: A portion of west central Idaho, including the following areas, Boise Mountains and West Central Mountains.
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WHEN: From midnight MDT tonight through Monday evening.
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IMPACTS: Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Creeks and streams may rise out of their banks. Potential for mud and rockslides to block roads.
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ADDITIONAL DETAILS:
- Forecast storm total rainfall is just under an inch in mountain valleys and up to 2-3 inches on ridges. Snowmelt will augment rainfall amounts, especially in high terrain. Convective showers and storms Monday afternoon may continually develop over the same areas downstream of mountains leading to locally much heavier rainfall and higher flood potential.
- http://www.weather.gov/safety/flood
Heavy-moderate rain combined with high elevation snowmelt. Terrain induced storms Monday afternoon will cause locally much heavier rainfall. Flows in rivers may quickly increase and reach critical levels. There is potential for mud and rockslides. * WHAT...Flooding caused by excessive rainfall and snowmelt is possible. * WHERE...A portion of west central Idaho, including the following areas, Boise Mountains and West Central Mountains. * WHEN...From midnight MDT tonight through Monday evening. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Creeks and streams may rise out of their banks. Potential for mud and rockslides to block roads. * ADDITIONAL DETAILS... - Forecast storm total rainfall is just under an inch in mountain valleys and up to 2-3 inches on ridges. Snowmelt will augment rainfall amounts, especially in high terrain. Convective showers and storms Monday afternoon may continually develop over the same areas downstream of mountains leading to locally much heavier rainfall and higher flood potential. - http://www.weather.gov/safety/flood
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.
ESFBOI Synopsis: An atmospheric river in the Pacific is bringing abundant moisture to the region. Storm total rainfall amounts in the Outlook area range from 1" in valleys to 2" on ridges. Rainfall amounts underestimate flood potential as snowpack melt will add snow-water equivalent contributions of around 2". Where: Elkhorn and Wallowa Mountains in Oregon. Adams, Washington, northern Gem, Valley, Boise, and northern Elmore counties in Idaho. When: Rainfall beginning Sunday evening and ending Monday evening. Rain will expand from NW to SE in the first few hours. What: Moderate rainfall leading to rises in creeks, streams, rivers, and lakes. Rainfall could be locally heavy Monday morning and Monday afternoon/evening as terrain driven storms become more likely leading to potential for minor flooding. Potential for mud or rockslides. The next update will be provided Sunday afternoon. Continue to monitor the latest forecasts and river forecasts from the National Weather Service.
ESFBOI As the rainfall event moves into the next 24 hours the locations of highest flood potential are becoming more clear. The West Central Mountains and Boise Mountains have been included in a Flood Watch. Confidence in flood potential for Baker County and the Weiser Basin is not high enough for inclusion in the Watch, but these zones may still see increased river flows during and after the event. Continue to monitor the latest forecasts and river forecasts from the National Weather Service.
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