Flooding possible with late season storm

Sprague & Williamson Rivers likely targets of spring flooding due to late storm

A late season atmospheric river will take aim at southern Oregon and Northern California this weekend.

The heaviest rainfall rates are expected Sunday morning through early Monday afternoon, with precipitation totals well above what would typically be seen this time of year.

Expect areas of standing water, rapid rises in rivers and streams, and very swift streamflows. Flooding is possible in more vulnerable areas. Rivers and streams east of the Cascades, particularly the Sprague, Williamson, and Pit Rivers, may also see the threat of flooding due to rain and rapid melting of snowpack.

A flood potential outlook is issued when there is the potential for significant rises or flooding along rivers and streams. The exact scenario for flooding remains uncertain. This product will be updated as necessary. Watches and warnings may be issued by the National Weather Service if this situation worsens.

Timeline for tonight through Monday

Areas of light to moderate rain tonight with snow levels lowering to 5500-6500 feet.

Friday will see moderate to heavy rain at the coast, Coast Range, and Cascades. It will also be windy east of the Cascades and in the Shasta Valley. Snow levels will lower from 5500-6000 feet to 4000-5000 feet.

Rain will continue through Saturday, but will be lighter with snow levels 4000-5000 feet rising to 6000-7000 feet.

Another round of moderate to heavy rain will develop Sunday along the coast, in the Coast Range, and in the Umpqua Basin with snow levels 7000-8000 feet. The heavier precipitation will continue into Monday and spread to the Mt. Shasta area with snow levels lowering to 6000-8000 feet.

Detailed forecast for Klamath Falls, Ore.

Tonight:
A 30 percent chance of showers. Cloudy, with a high near 51. South wind around 9 mph.

Friday:
Rain likely, with thunderstorms also possible after 11am. Cloudy, then gradually becoming mostly sunny, with a high near 46. Breezy, with a southwest wind 8 to 13 mph increasing to 17 to 22 mph in the afternoon. Winds could gust as high as 33 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Friday Night:
A slight chance of rain and snow showers. Mostly cloudy, with a low around 33. West southwest wind 9 to 14 mph becoming light southwest after midnight. Winds could gust as high as 21 mph. Chance of precipitation is 20%

Saturday:
A chance of rain and snow before 11am, then a chance of rain. Mostly cloudy, with a high near 49. South wind 6 to 10 mph. Chance of precipitation is 40%. Little or no snow accumulation expected.

Saturday Night:
A 30 percent chance of rain, mainly before 11pm. Mostly cloudy, with a low around 41.

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