Areas in the Northeast face the risk of drenching, gusty and locally severe storms on Wednesday.
The second half of the week looks to be noticeably cooler and less humid in the Chicago area.
Tropical Depression Two has formed in the Atlantic and could become the next tropical storm of the season by midweek.
Severe storms will rumble through parts of the Midwest, including Chicago, early Tuesday night.
Warm and humid air in place over much of the Northeast at midweek will contribute to the risk of drenching, gusty and locally severe thunderstorms on Wednesday.
After temperatures briefly climb to typical midsummer levels, another cooldown will roll into the Midwest and expand to the East for the last part of July.
With the recent heat fading away, more relief will greet the Northwest by midweek in the form of rain.
After pounding Taiwan, Typhoon Matmo will bring strong winds and flooding to China next
A potent storm system moving out of the Northwest United States will bring an elevated risk of tornadoes to parts of Alberta and Saskatchewan on Thursday.
Unseasonable warmth is expected to continue from the United Kingdom through northern Europe and Scandinavia into the weekend.
Montpelier, ID (1990)
75 mph winds gust; tree damage.
Seattle, WA (1991)
99 degrees, all-time record high for July.
Heat Wave: Location New Record(F): Old Record(F)/Year: Washington, D.C. 101 100/1987 Philadelphia, PA 99T 99/1978 Atlantic City, NJ 100 96/1987 Harrisburg, PA 103 98/1987 Baltimore, MD 103 98/1987 (Custom House)