National Weather Service United States Department of Commerce


Above average temperatures will accelerate Sierra snowmelt. River and stream flows will increase with an enhanced risk for river flooding. Read More >

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Last Map Update: Tue, May. 23, 2017 at 11:49:21 am PDT

National Weather Service Medford, ORNational Weather Service Pendleton, ORNational Weather Service Boise, ID
National Weather Service Sacramento, CAZoom

National Weather Service Elko, NV
National Weather Service San Francisco Bay Area, CANational Weather Service San Joaquin Valley, CANational Weather Service Las Vegas, NV

High pressure will bring a drying and warming trend to the region early this week. As temperatures rise, increased snowmelt will add flows to area creeks, streams and rivers. This will increase the potential for flooding especially along areas of the Truckee River, the East and West Forks of the Carson River, the main stem of the Carson River, the East and West Forks of the Walker River and the main stem of the Walker River. Prepare for the chance of minor flooding along flat low lying areas, campgrounds, gravel roads, and hiking/biking trails. Keep tuned to our latest hydrology section in our Area Forecast Discussion. An upper-level disturbance will approach our area Thursday leading to breezy conditions starting Wednesday and lasting through the early part of the weekend. Temperatures will cool around the region in response to this upper-level shortwave. An increased chance in thunderstorms is also forecast, especially north of I-80 Thursday through Saturday.
Good News! The forecast for the Walker River has changed significantly. The current forecast is now for minor to moderate flooding this week due to multiple factors. Do not let your guard down and keep flood mitigation measures in place along the Walker River until the snowpack has diminished significantly. For more information check the Hydrology section of the Area Forecast Discussion.
A substantial warmup will start to melt the high elevation snowpack which will increase flows into the Carson River Basin. The increased flows will result in minor flooding along portions of the West Fork Carson near Woodfords and into the southwest Carson Valley. Minor flooding is also forecast along portions of the East Fork Carson from near Markleeville into the Carson Valley. This flooding will be confined mainly to farm and ranch lands near the river, but a few rural roads could be impacted. Flows are likely to be highest during the overnight hours before falling during the morning. Click here for the latest Flood Advisory Statement.
High flows will return to the upper portions of the Truckee River from Tahoe City downstream to the confluence with the Little Truckee River below Boca Reservoir. These increased flows are a combination of increased releases from Lake Tahoe and expected increased snowmelt due to higher temperatures early this week. These high flows are likely to last into the Memorial Day weekend. Higher flows are likely farther downstream by the middle of this week. Impacts...Minor flooding will cover sections of the bike path along Highway 89. Some backyards and basements along the river near Highway 89 may be inundated by the high flows. Campgrounds along Highway 89 may be impacted by these higher flows as well. Click here for the latest Flood Advisory Statement.
A Small Stream Flood Advisory is in effect for portions of eastern California and western Nevada. Warming temperatures will accelerate snowpack melt across the Sierra through Memorial Day. Best estimates for flows this week coming out of unregulated eastern Sierra creeks and streams are likely to be 2-3 times current flows. Creeks and streams will run fast and very cold, bringing the risk of hypothermia for those without protective gear. Flood water will likely inundate pasture land, some campgrounds, cover hiking and biking trails and roads leading into the high country. Excessive runoff may also generate rock and mud slides in steep terrain. Persons living along small creeks and streams should monitor the latest weather information at and be prepared to take action should flooding occur.


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