The coldest air of the winter will plunge southward across much of the eastern United States and will feature single-digit and sub-zero temperatures in the Northeast during Valentine's Day weekend.
A storm will bring snow and ice that will lead to slippery travel along a 1,500-mile swath from northern Arkansas and Georgia to Maine early next week.
Heavy rain will raise the risk of flooding across more than a dozen states in the Southeast on Presidents Day to the East Coast on Tuesday.
Umbrellas will be needed on Valentine's Day as scattered showers overspread Germany.
As warming ocean waters continue to threaten coral reefs worldwide, researchers at the University of Hawaii have developed a plan that could reverse the rapid decline of these ecosystems.
Snow days are exciting for children, but harsh cold and treacherous wintry weather can make it difficult to get outdoors and play.
Eastern US (1981)
All time high pressure reading were set: Asheville, NC 30.84 inches; Wilmington, DE 30.99 inches; Baltimore, MD 30.97 inches; Scranton, PA 30.96 inches; Louisville, KY 30.99 inches; Washington, D.C. 31.02 inches; Hartford, CT 31.03 inches; Allentown, PA 31.03 inches; Philadelphia, PA 3 inches.
Eastern US (1985)
Great Ohio Valley snowstorm whips snow into mountainous drifts and strands hundreds. In southwest Ohio 10 plows were stuck in the drifting snow and abandoned. Over a foot of snow in central and eastern Kentucky with 10 - 15 ft. drifts. Over 2 inches of snow in most of North Carolina.
Minneapolis, MN (1990)
String of 48 consecutive days with above normal temperatures broken.