The Pennsylvania Department of Environmental Protection also has continued to issue a code orange air quality alert for the Lehigh Valley and Berks County.
Several counties in the Triangle were under a heat advisory for much of Saturday because the high temperature in the mid-90s will feel much hotter when you factor in the humidity.
This is the first excessive heat warning to be issued in Western New York since 2011.
The heat warning starts at noon on Friday and runs until 8 p.m. on Sunday. Lows tonight will only fall into the upper 60s to lower 70s in the outlying areas, with lower to middle 70s along much of the coast.
On July 4, heat will overtake a majority of the eastern US with triple-digit heat index values across the entire central USA and heat index values in the upper 90s across the East Coast.
Temperatures, dewpoints, and heat index values will be very similar on Monday. Get ready for widespread 90s on Saturday as well.
The most intense heat and humidity will likely last into early next week, with Monday and Tuesday both seeing high temperatures return into the upper 90s and triple-digit heat indices.
There is a marginal risk of severe thunderstorms Monday, with isolated strong to severe winds and localized flash flood potential.
Sunday will be the worst: NY was forecast to reach 98 degrees but it could feel like 107; and Philadelphia was predicted to reach 100 degrees, forecasters said. Reschedule strenuous outdoor activities. Persons on salt restrictive diets should consult a physician before increasing their salt intake.
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The nearest cooling center may be found by calling 311, or visiting the city's "Beat the Heat" website.
Far northern and northeastern Missouri will be under a heat advisory through Saturday as well. Temperatures will be slightly cooler on Sunday, but that is a relative term. Expect high temperatures in the low 90°s.
There is also an 80 percent chance of thunderstorms in Grand Rapids on Sunday evening.
We will have quite the heat wave! Limit time outdoors if possible, and make sure to stay hydrated by drinking plenty of water!
The hot weather is especially risky for young children, elderly people and people with health problems, it said.
Perhaps the most oppressive heat, however, is found in the urban Midwest, where this high pressure bubble will peak Sunday, forecasters say.
Stay in the shade to help keep cool.
HEAT CRAMPS: Painful spasms usually in the muscles of legs and abdomen with heavy sweating. Apply cool, wet cloths. If a victim is continuously vomiting or loses consciousness, call 911 or your local emergency number immediately. Victims of this illness should be treated in the same ways as those with heat exhaustion but do not give fluids.
Anyone who'll be working or otherwise spending time outside between now and Monday should take extra precautions.
- Wear clothing that is lightweight, light-colored and loose-fitting.