BUFFALO, N.Y. (AP) — After a three-day onslaught that dumped a historic 7 feet of snow on the Buffalo area and killed at least 12 people, the sun came out, but so did predictions of flooding caused by rain and temperatures of up to 60 degrees.
Roadside Snow view from a car on November 21, 2014 in Buffalo, New York as the death toll attributed to Buffalo snow rises to 13. A brutal blast of Arctic air triggered a lake-effect storm and snow in the states of New York, Ohio, Michigan, Wisconsin and Pennsylvania. (Anadolu Agency/Getty Images)
Weather Service meteorologist Jon Hitchcock said there might be trouble with drainage as snow and the uncollected autumn leaves underneath blocked catch basins.
"The biggest flood threat would be on Monday when temperatures are at their warmest," he said. "There could be general urban flooding."
Beth Mack and her son Daniel clear the roof of their home in Eden, N.Y. Friday, Nov. 21, 2014. A snowfall that brought huge drifts and closed roads in the Buffalo area finally ended Friday, yet residents still couldn't breathe easy, as the looming threat of rain and higher temperatures through the weekend and beyond raised the possibility of floods and more roofs collapsing under the heavy loads. (AP Photo/The Buffalo News, Mark Mulville)
The water tied up in the snowpack — roughly the equivalent of six inches of rain — could be released over the course of two days, said deputy Erie County executive Richard Tobe.
"If it was released as rain it would be a monumental storm," Tobe said.
He said flooding would likely affect mostly basements and creeks.
The National Weather Service issued a flood watch for Sunday to Wednesday.
"We are preparing now for more flooding than we've seen in a long, long time," Gov. Andrew Cuomo said. Cuomo said the state was sending in pumps, boats, helicopters and high-axle vehicles that can operate in 4 to 5 feet of water.
"If we're lucky we won't need any of it," he said. "But prepare for the worst and hope for the best."
The snow remained a huge challenge. Officials were still urging people to put off nonessential travel so snow removal efforts could progress. Cuomo reopened a 132-mile stretch of the state Thruway that had been closed since Tuesday, but several exit ramps remained closed along the westernmost 75 miles.
"Assume if you get on headed west you can't get off until Pennsylvania," the governor said. He said roads remain "very dangerous."
Local travel bans were beginning to be lifted Friday so delivery trucks can bring in food and other essentials to depleted supermarkets, the governor said.
Two more deaths were announced. A 50-year-old man was found Friday morning in his car, which was buried in snow in Cheektowaga, police said. The cause of death wasn't immediately known.
One elderly resident of a nursing home, also in Cheektowaga, died after it was evacuated amid concerns of a roof collapse, a spokeswoman for the home said.
More than 30 major roof collapses, most involving farm and flat-roof buildings, were reported overnight, officials said Friday, and rain forecast to arrive with warmer temperatures could add to the strain.
Friday's improved weather inspired some homeowners to climb onto roofs to shovel off the snow and reduce the danger of collapse.
"Five hours yesterday and that's just the beginning," John Normile of Lake View said as he and his daughter and her boyfriend cleared up to 6 feet of snow from the roof of his ranch-style home.
"We're getting really concerned about the weight of it," Normile said. "We've got to do it before the rain comes."
See video captured by a drone from the snow-sacked region below, via NBC:
Associated Press Writers Chris Carola in Albany and Jim Fitzgerald in White Plains contributed to this report.