As cooler air drives into the sea of heat and humidity in the East, locally powerful thunderstorms will continue to develop into this evening.
Relief is coming for those with heat-sensitive health problems, but big thunderstorms are marking the transition.
There is a risk of strong to perhaps damaging thunderstorms this afternoon and evening along the I-95 corridor from Richmond to Washington, D.C., Baltimore, Wilmington, Philadelphia, Trenton, New York City, Hartford, Providence and Boston.
While the storms will not be severe in every neighborhood, they can bring a brief period of damaging wind gusts and blinding downpours to many locations.
A few communities can be hit with downed trees and power outages, frequent lightning strikes, urban flooding and hail.
Much cooler and drier air will work in aloft, while the air remains hot and humid at the surface into this evening.
This setup produces an unstable atmosphere that can be made acute by the approach of the cooler air at the surface.
Folks spending time outdoors into this evening should keep an eye out for rapidly changing weather conditions and seek shelter in a building away from windows as storms approach.
In addition to the heat, the approach of the storms could lead to delays at area airports and poor visibility on the highways, due to blinding downpours.
As a large storm rolls out of the Plains and Midwest, a swath of snow, ice and travel disruptions will extend into the Northeast beginning during the latter part of the weekend.
February's record cold is expected to weaken across the East and Midwest heading into the month of March.
The weekend is setting up to be a slippery and messy one across a large part of the Plains and Midwest as a new winter storm rolls northeastward.
Residents in Spokane, Washington, recently caught sight of the unique phenomenon known as "hole punch" clouds that cause a gaping hole in the otherwise cloudy sky.
The week kicked off with a heavy snow expanding across areas of the Four Corners states before striking the South with snow and ice, causing treacherous travel from Shreveport, Louisiana, to Memphis, Tennessee.
Snowshoers across the country will descend upon Eau Claire, Wisconsin, from Feb. 27 to March 1 to compete in the 2015 U.S. National Snowshoe Championships.
Severe cold Arctic outbreak in Northern Plains with temps. 40 to 50 degrees below zero. But, at the same time, warm in the East; 80's in Carolinas: Charleston, SC - 86 degrees Wilmington, NC - 85 degrees Minneapolis, MN - -9 degrees/-26 degrees Medora, ND - -47 degrees Big Fork, MN - -44 degrees Thoeny, MT - -52 degrees Huron, SD - -39 degrees, February record
Belouve, Reunion (1964)
52.76" of rain in 12 hours (world record) (Feb. 28-29).
Nome, Alaska (1995)
Seasonal snow record of 108 inches set. The old record was 107.5 inches set during the 1931-1932 cold season.