Oppressive heat and humidity blanketing the Northeast early this week will end after midweek. A cold front will cut into the heart of the heat on Wednesday, but relief will come at a stormy price.
As searing heat and humidity mix into a perfect thunderstorm cocktail, thunderstorms will erupt along the megalopolis from Boston to New York City, Philadelphia and Washington D.C., on Wednesday.
The storms will fire first near Erie, Pa., Albany, N.Y., and Portland, Maine, then explode southward reaching the major cities by the late afternoon or evening hours.
Damaging blasts of wind, blinding downpours and hail bigger than the size of quarters are possible with the most potent storms.
Anyone with outdoor activities planned for Wednesday should have a watchful eye to the sky if thunderstorms approach. Heed all severe weather watches and warnings and be prepared to take swift action.
This frightful Wednesday weather will mark the return to a more comfortable air mass for the end of the week, as high temperatures fall into the 80s and humidity values tumble Thursday and Friday.
Be sure to keep checking back with AccuWeather.com for the latest severe weather information and updates.
Following a dry end to the holiday weekend, showers and thunderstorms will quickly return to the Northeast and increase in number through Wednesday.
Cooler air is on the way for parts of northern Europe that experienced extreme heat over the past week.
The unrelenting heat across the interior West will continue through the first part of this week, but there is a light at the end of the tunnel.
A cold front advancing across the central United States will bring the threat of severe weather from Wisconsin to Texas on Monday.
A budding tropical system may pass close enough to Hawaii to bring an uptick in gusty showers and thunderstorms as well as building seas late the week.
After moving through Guam over the weekend, Chan-hom will intensify as it tracks toward Japan's Ryukyu Islands, Taiwan and eventually east-central China this week.
Extreme heat, Belgrade reached a high of 106, surpassing the all-time record of 103 from August 5, 1961. Missoula hit 107, breaking the old all-time record high of 105 from July 10, 1973. Cut Bank topped out at 106, the first time the temperature had been over 100 since August 1983.
Buffalo, NY (1819)
"Buffalo Fish Fall": a 13-inch long herring weighing 9 oz. fell from the sky onto Main St.
Philadelphia, PA (1901)
Last of 12 straight days with temperatures 90 degrees or above.