Powerful Pacific Storm to Continue Impacting Northern California; Heavy Snow in the Appalachians and Portions of the Northeast

A strong atmospheric river will continue to impact northern California with heavy rain and life-threatening flooding through Friday. Unsettled weather is expected across much of the Northeast and Great Lakes over the next few days, including the likelihood of heavy snow in the central Appalachians and higher elevations of northeastern Pennsylvania and southern New York. Read More >

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Last Map Update: Thu, Nov 21, 2024 at 11:54:11 pm PST

Watches, Warnings & Advisories

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Winter Storm Warning

High Wind Warning

Storm Warning

Flood Warning

Gale Warning

Flood Advisory

Hazardous Seas Warning

Lake Wind Advisory

Wind Advisory

Flood Watch

Hydrologic Outlook

Round 2 of Strong Winds

Heavy Rain Continues

Flood Watches/Warnings

Snow Load

Another strong low pressure (though weaker than the last event) will affect the region late today into Friday. This will bring another round of strong, damaging winds today, especially along the coast, in the Shasta Valley and across portions of the East Side. Downed trees and power lines could result in power outages. Travel will be extremely difficult (especially for areas expecting heavy snow), most challenging for high profile vehicles like semi trucks. Be sure to secure loose objects on your property.

A prolonged period of moderate to heavy rain is expected this week as an atmospheric river stalls across the area. The highest rainfall amounts are expected in Curry County and western/southern Siskiyou County. Rises on mainstem rivers expected with some threat of minor flooding. There will be an increased risk for debris flows and land/rock slides, especially over burn scars, and frequent ponding of water on roadways. If you come across a flooded roadway, remember “Turn around, don’t drown!”

Flood watches and warnings are in effect for portions of the area due to heavy and excessive rainfall, and in some places, combined with snow melt. Expect flooding of urban areas, small creeks and streams as well as frequent ponding of water on roadways. Do NOT attempt to cross a flooded roadway, remember “Turn around, don’t drown!”

Given recent heavy snowfall, and subsequent heavy rainfall on top of the snow, we have been getting questions about snow load on rooftops. This graphic shows how the weight of snow varies significantly and is highly dependent on water content. Consider removing snow from your roof if your estimated weight of the snow exceeds 20-25 lbs/sq ft. Do it yourself? Not so fast. This is dangerous, so be safe and consult a snow removal professional.