Washington, D.C., and Baltimore will be at risk for storms bringing flash and urban flooding, as well as damaging wind gusts and hail through Tuesday.
Downpours and storms can be intense enough to delay travel with the worst of the storms during the afternoon and early nighttime hours.
Motorists should be prepared for blinding downpours and flooded roadways.
As the strongest storms sweep through the metro area, a ground stop could occur at area airports.
A small number of the storms can down trees and cause sporadic power outages.
Seek shelter as storms approach as the greatest danger to those outdoors will be from lightning strikes.
The risk of flooding downpours and thunderstorms will shift eastward on Wednesday, but beaches from Florida to Maine will still be at risk for disruptions.
The storms are begin driven by a dramatic change to cooler weather over the Midwest.
While the core of the cool air will hold up in the Appalachians and the Midwest this time, the air will turn much less humid during the second half of the week and will allow rather low nighttime temperatures for the middle of July around the city.
Early indications suggest that the first tropical system of 2015 could spin up off the southern Atlantic Coast of the United States this week.
After a cooler-than-normal summer 2014, the Northeast can anticipate more 90-degree days. Meanwhile, drought conditions will expand in the West.
A 4.2-magnitude earthquake shook Lower Michigan on Saturday with weak shaking reported westward to the Chicago area.
Thunderstorms are set to return to the Plains for the first week of May following a relatively quiet end to April.
Strong thunderstorms threaten to close out the weekend across parts of the Upper Midwest, posing risks to those with outdoor plans and potentially causing damage.
Warm and dry Saharan air will spread across southern Europe through much of this week.
Bismarck, ND (1991)
Snowfall of 6.1".
Prichard, AL (1994)
3 students were injured while using an electric pencil sharpener at the same time lightning struck a tree just outside a window of the school.
Charleston, SC (1761)
Large tornado swept Charleston harbor when British fleet of 40 sails was at anchor. Raised waves 12' high, many vessels on beam-ends, 4 killed.