1:05
In the Northeast, heat advisories stretch from Maryland to northern Vermont.
The heat index is forecast to jump Wednesday to 101 degrees in Philadelphia and 98 degrees in New York City and Washington, D.C.
![\"PHOTO:](\"http://a.abcnews.com/images/US/map1-02-ht-iwb-220720_1658322923055_hpEmbed_16x9_384.jpg\")
Outdoor pool hours will be extended to 8:00 p.m. on Wednesday (July 20) and Thursday (July 21) at our Olympic- and intermediate-sized pools, due to the heat advisory. Visit https://t.co/NXTE1bn5JM to find a pool near you. pic.twitter.com/JrP6gWZcED
— NYC Parks (@NYCParks) July 19, 2022
On Thursday, the heat index is forecast to reach a blistering 102 degrees in Washington D.C., 104 in Philadelphia and 98 in Boston.
Boston has declared a heat emergency.
We are putting up misting tents to support our Cooling Centers and pools in keeping #Boston cool. Here, teens enjoy one at BCYF Tobin Community Center in #MissionHill and another one goes up at BCYF Menino Community Center in #Roslindale. More to come.... pic.twitter.com/e9cGPPyRIP
— Boston Centers/BCYF (@BCYFcenters) July 19, 2022
The heat wave in the Northeast is expected to last through the weekend and may linger into next week.
Meanwhile, in the West, temperatures are expected to climb to 112 in Palm Springs, California, and 113 in Las Vegas on Wednesday.
And in Europe, the United Kingdom on Tuesday reached its highest temperature ever, breaking 40 degrees Celsius for the first time as U.K. officials declared a national emergency and issued unprecedented health warnings.
Tuesday was the busiest day for London’s fire department since World War II, Mayor Sadiq Khan said.
Spain and Portugal have reported more than 1,100 heat-related deaths amid Western Europe's record-breaking heat wave.
People in Paris and London will feel some relief Wednesday with temperatures falling to 75 degrees Fahrenheit and 80 degrees Fahrenheit respectively.
![\"PHOTO:](\"http://a.abcnews.com/images/US/lille-france-heat-wave-02-ap-iwb-220720_1658322585103_hpEmbed_3x2_384.jpg\")
But the heat Wednesday turns to Spain, Italy and Germany.
Madrid is forecast to reach 99 degrees Fahrenheit, Milan 98 degrees and Berlin a scorching 100 degrees.
![\"PHOTO:](\"http://a.abcnews.com/images/US/spain-heat-wave-02-ap-iwb-220720_1658322503998_hpEmbed_3x2_384.jpg\")
Click here for tips to stay safe in the heat.
ABC News' Kenton Gewecke and Daniel Amarante contributed to this report.
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