Dangerous storms threaten to ruin outdoor plans and wreak havoc on the evening commute across the eastern Great Lakes and Northeast.
Very hot and muggy air will help to fuel the thunderstorms with temperatures climbing well into the 80s and 90s.
At least a couple of zones of nasty thunderstorms are expected to develop with the heating of the day encompassing areas from lower Michigan, Ohio, Pennsylvania and upstate New York to Virginia, the Delmarva, coastal New York, New Jersey and part of New England.
Some of the storms will become severe, providing the threat for damaging wind gusts and hail. In a couple of instances a tornado can be produced by the strongest storms.
Detroit, Cleveland, Buffalo, Pittsburgh, Philadelphia and perhaps New York City could all be in the path of the damaging storms.
The strongest storms can produce wind gusts to 65 mph which is more than enough to knock down tree limbs and power poles.
While damaging winds appear to be the biggest threat, there can be large hail and flash flooding.
If threatening weather approaches, be sure to have a secure indoor location to move to.
Heed any watches or warnings and as always, check back with the AccuWeather.com Severe Weather Center.
Strong thunderstorms will shift farther east Monday evening, bringing a damaging wind threat to Rochester, Burlington, and perhaps Montreal. However, as the night progresses, thunderstorms will lose their intensity thanks to loss of daytime heating.
Many areas in the Eastern states will have consistent summerlike heat and a buildup of humidity for the last week of May.
Severe storms are erupting across the southern Plains, threatening to bring additional downpours to areas that sustained life-threatening flooding over the weekend.
Torrential rain and strong thunderstorms pushed across the southern Plains over the weekend, spawning tornadoes and dangerous flash flooding from Kansas to Texas.
Severe thunderstorms will rumble across Texas and the southern Plains into Monday night, impacting similar areas that were hit earlier in the holiday weekend.
Severe storm- and flood-weary residents of Texas and the southern Plains will soon get a break as a change in the weather pattern develops.
While California usually offers ideal growing conditions for one of America's trendiest foods, the drought has avocado farmers concerned about future production.
Dallas, Ft. Worth Texas (1982)
Flooding rains in Dallas, Ft. Worth, area; over 2" in most places. Total rainfall of 13" at this point of the month, making it the wettest May since records began in 1898.
Wesley, LA (1991)
Heavy rain (25th-26th) resulted in widespread flooding. One hundred-sixty homes -- 80% of the total number of houses in town -- received structural or water damage. A total of 6.5" of rain fell in 2-1/2 hours.
Philadelphia, PA (1991)
96 degrees -- a record sixth 90-degree reading for the month. (The month ended with twelve 90-degree days.)