A push of cooler, less humid air is triggering showers and locally heavy, gusty thunderstorms from the eastern Great Lakes to the central and northern Appalachians, mid-Atlantic and New England coast Thursday.
While the storms will be hit and miss, a few locations can be hit hard with brief powerful wind gusts, blinding downpours and travel delays.
A small number of locations can experience power outages from the gusty storms and/or can be hit with flash flooding.
Cities included in the area for potentially severe thunderstorms and flash flooding are Cleveland, Pittsburgh, Buffalo, Philadelphia, New York City, Albany, N.Y., and Burlington, Vt.
Storms may also bear down on Syracuse, N.Y., where the New York State Fair begins on Thursday.
High humidity will be swept away Friday into the weekend as a Canadian air mass settles over the region.
Warmth and humidity will rebuild over much of the area next week.
Tropical Depression 8 should strengthen into a tropical storm before impacting the coastal Carolinas with rough surf and heavy downpours early this week.
Tropical Depression 9 developed just south of Florida on Sunday and will turn toward the northeastern Gulf Coast of the United States this week.
Brief relief from heat and humidity will arrive in the northeastern United States at the start of September.
Typhoon Lionrock is poised to make landfall in Japan near Sendai early in the new week with heavy rainfall, damaging winds and an inundating storm surge.
Hawaii is facing two tropical threats this week as Madeline and Lester churn westward.
Hot and dry weather will greet fans and competitors at the 2016 U.S. Open Tennis Championships in Flushing, New York, as play begins Monday, Aug. 29.
New England (1816)
"Year in which there was no summer", otherwise known to weather historians as "1800 and frozen to death" killing frost once again damages sparse corn corp in northern New England...loss of this and other crops led to severe famine in much of New England that winter...and helped spur western migration in spring of 1817.
New England (1965)
A total of 2.5 inches of snow on top of Mt. Washington set an August record. Vermont had a reading of only 25 degrees, while Nantucket had a chilly 39 degrees. Earliest freeze on record at many stations.
Houston, TX (1980)
2.23 inches of rain fell in less than 1 hour. Streets were flooded in the downtown district and a tornado touched down briefly west of Houston at Sealy, TX.