While flooding is likely to be minor and sporadic through Friday, the warmup and rainfall will continue to bring the risk of leaky roofs and roof collapses into the weekend.
This risk is greatest on flat roofs.
"A deep snow varied by drifting, combined with rainfall, natural melting and blocked drainage systems on the roofs can lead to uneven weight distribution," According to Forensic Weather Expert Steve Wistar, "When this weight exceeds the design of the roof, a partial or total collapse could occur."
Property owners may want to consider removing some of the snow from the roof, only if they can do so safely. If any doubt, consult a properly-insured private contractor.
In some cases, strained roofs that survive the added weight from this week's rain could succumb to additional storms later this season.
A collapsed resort building is seen in Gyeongju, South Korea, Tuesday, Feb. 18, 2014. The roof of the resort auditorium collapsed during a welcoming ceremony for South Korean university freshmen, killing nine and likely trapping about 10, officials said Tuesday. (AP Photo/Yonhap, Lee Jae-hyuck)
Cold air is expected to return in stages this weekend, and additional storms with heavy snow are possible beginning next week. The return of cold air will cause slush and runoff to freeze.
The lingering snow cover and added moisture from the rainfall and additional snowstorms will carry the flooding forward through the remainder of the winter and perhaps into the spring.
As of Tuesday, Feb., 18, 2014, there was as much as 6 inches of water locked up in the snow over parts of the Upper Midwest and northern New England. Farther south in the Midwest and Northeast, there was between 1 and 3 inches of water contained within the snow on the ground.
Over a surface area of one square foot, an inch of water (approximately 10 inches of snow on average) weighs about 5.2 pounds. However, the weight of the snow can vary, depending on its water content when it first fell and how much rain it absorbed later.
Steve Wistar is one of the nation's leading experts on roof snow loads.
A low pressure system set to slam into the Northwest will not only deliver rain over region, but also the threat of flooding and avalanches.
This season, ice coverage on the Great Lakes has exceeded all other measurements since 1979.
Despite early March rain and snow, worries escalate as water supplies remain low.
See the weather conditions anticipated for some of the top vacation destinations for spring breakers.
A dry weather pattern has returned to much of California after the recent spell of rainy weather, leaving residents wondering when they will see rain again.
A drier and warmer stretch of weather is in store for the U.K. after a stormy February that resulted in flooding.
Buffalo, NY (1983)
High was 76 degrees -- shattered old record of 60 degrees set in 1973.
Northern Plains (1983)
Minot, ND had 6" of snow, Bismarck, ND had 7" of new snow and Mobridge, SD had 6" of new snow.
East Coast (1932)
Coastal storm produces record low pressures: Norfolk, VA, 28.35"; Washington, DC, 28.67"; Atlantic City, NJ, 28.20"; Boston, MA, 28.45". All were station records; accompanying winds were not high and caused little damage.