(CNN)After the West Coast got walloped by record-setting rainfall and dangerous mudslides — with more heavy rain in store Monday — 70 million Americans in the eastern US are now also at risk for severe weather.
The National Weather Service warns of rapidly developing East Coast stormThe threat zone Monday stretched from the southern Appalachians to New York City, according to the National Weather Service’s Storm Prediction Center. A severe thunderstorm watch was in effect Monday evening for portions of eastern Maryland, central and eastern Virginia and central North Carolina. Damaging wind gusts up to 70 mph are the main threat, but hail up to 1.5 inches in diameter and an isolated tornado or two are also possible. The watch is in place until 1 a.m. ET Tuesday.Flash flooding is another concern. From Massachusetts to New Jersey, flash flood watches were in effect from Monday evening through Tuesday afternoon. Photos: West Coast faces a barrage of weather hazards Photos: West Coast faces a barrage of weather hazardsA car crosses a flooded parking lot in Oroville, California, on Monday, October 25.Hide Caption 1 of 11 Photos: West Coast faces a barrage of weather hazardsWorkers clear floodwaters in Hollister, California, on Monday.Hide Caption 2 of 11 Photos: West Coast faces a barrage of weather hazardsRocks and vegetation cover Highway 70 following a landslide in Plumas County, California, on Sunday, October 24. Heavy rains blanketing Northern California created slide and flood hazards in land that has been scorched by wildfires. Hide Caption 3 of 11 Photos: West Coast faces a barrage of weather hazardsA tree lies across a fence in Ross, California, after falling during a storm on Sunday.Hide Caption 4 of 11 Photos: West Coast faces a barrage of weather hazardsA motorist surveys floodwaters from Lake Madrone crossing Oro Quincy Highway in Butte County, California.Hide Caption 5 of 11 Photos: West Coast faces a barrage of weather hazardsWorkers try to divert water into drains as it was pouring rain in Marin City, California, on Sunday.Hide Caption 6 of 11 Photos: West Coast faces a barrage of weather hazardsA couple pushes a vehicle away from a flooded area in Fairfield, California, on Sunday.Hide Caption 7 of 11 Photos: West Coast faces a barrage of weather hazardsCrews work to upright an overturned tractor-trailer on the Richmond-San Rafael Bridge in Richmond, California.Hide Caption 8 of 11 Photos: West Coast faces a barrage of weather hazardsHeavy waves break against the coast Sunday in Depoe Bay, Oregon. Hide Caption 9 of 11 Photos: West Coast faces a barrage of weather hazardsA firefighter persuades a resident to evacuate a flooded area in Santa Rosa, California, on Sunday.Hide Caption 10 of 11 Photos: West Coast faces a barrage of weather hazardsWorkers clear branches from a road in Forestville, California, on Sunday.Hide Caption 11 of 11The rate of rainfall could top 1 inch per hour at times, with several total inches of rainfall expected in some areas, the weather service said.Read MoreAlready, the storm has triggered at least 13 reports of tornadoes Sunday in Missouri, Illinois and Kansas, according to the weather service. The NWS in St. Louis confirmed an EF-3 tornado in Fredericktown, Missouri, and an EF-1 in Chester, Illinois. Damage surveys are ongoing and the results are still preliminary.Farther west, Californians are still grappling with torrential rainfall that shattered records.On Sunday, downtown San Francisco had “By far the wettest Oct day ever,” the weather service’s Bay Area office tweeted Monday. With 4.02 inches of rain, Sunday also marked the “4th Wettest day EVER in SF with records back to Gold Rush,” the weather service office said.A worker tries to clear a drain in a flooded street Sunday in San Rafael, California, near the San Francisco Bay.Sacramento broke its 24-hour rainfall record, with 5.44 inches of rain reported downtown between 1 a.m. Sunday and 1 a.m. Monday, the National Weather Service Sacramento office tweeted.And the severe weather isn’t over for California, “as the heaviest rains shift southward into portions of Central to Southern California” on Monday, the weather service’s Storm Prediction Center said. “This will pose a threat of flash flooding and debris flow problems across recent burn scar areas.”California just suffered its worst summer drought on record, along with a spate of wildfires. But there’s a bit of good news with the recent rain. The Dixie fire — the second largest fire in California history — is now 100% contained after burning 963,309 acres, local officials said.