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.
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Temperatures will steadily rise as the week progresses in Los Angeles.
Many areas in the Eastern states will have consistent summerlike heat and a buildup of humidity for the last week of May.
Severe thunderstorms will rumble across the southern Plains on Monday, impacting similar areas of Texas and the southern Plains that were hit earlier in the holiday weekend.
Several disturbances pose the threat to become the first named tropical system in the Eastern Pacific Ocean over the next week.
While California usually offers ideal growing conditions for one of America's trendiest foods, the drought has avocado farmers concerned about future production.
New York City (1861)
Snow was reported.
Tornado swarm in Iowa, Illinois and Michigan; 74 killed.
Morden, Manitoba (1933)
Flash flood washes away bridges, ruined crops, and killed livestock.