Multiple states are bracing for severe weather as powerful thunderstorms target the Northeast. Thousands of flights have been delayed amid record travel expected for the Fourth of July.

A severe thunderstorm turned deadly Monday night in Wilmington, Delaware, when a falling tree killed a 79-year-old woman riding in a car, Delaware State Police said.

A severe thunderstorm turned deadly Monday night in Wilmington, Delaware, when a falling tree killed a 79-year-old woman riding in a car, Delaware State Police said.

Temperatures in Paris are expected to reach 38.3 degrees Celsius, approximately 101 degrees Fahrenheit, on Tuesday.

As a heat wave scorches most of Europe, the Eiffel Tower announced it will be closing early on Tuesday as Paris is expected to hit triple-digit temperatures.

Hurricane Flossie has strengthened off Mexico’s southwestern Pacific coast, with winds reaching 85 mph, according to the U.S. National Hurricane Center

Thunderstorms caused ground stops until late Monday night in the New York area, which led to hundreds of delayed flights in the Northeast.

Millions of Americans are under a severe weather threat for damaging wind and flash flooding risks from central Virginia to New York City.

Barcelona reports the hottest month of June since records started over 100 years ago

A depression that was formerly Tropical Storm Barry is dumping rain on eastern Mexico as Tropical Storm Flossie brews off its southwestern Pacific coast

ABC News Chief Meteorologist Ginger Zee has the latest forecast for the long Independence Day holiday weekend. 

Much of the nation is bracing for more severe weather as the projected record-breaking Fourth of July travel week kicks off.

A tropical depression has formed in the Bay of Campeche off Mexico’s southeast coast and is expected to strengthen into a tropical storm over the weekend

Major heat waves across Southern Europe have pushed temperatures above 40 degrees Celsius or 104 degrees Fahrenheit in countries like Italy, Spain and Greece

Over 400 flights were canceled into and out of Atlanta's Hartsfield-Jackson International Airport on Saturday after severe weather and hail fell overnight.

The Trump Administration has not explained the move that scientists warn could negatively impact forecasts for millions in hurricane-prone areas.

In the Midwest and Northeast, millions are preparing for severe thunderstorms with damaging winds possible. There is a severe thunderstorm watch for parts of Pennsylvania and Central New York.

For a second straight day, severe storms are battering much of the Heartland – delaying more than 750 flights at Chicago airports, cancelling dozens more and causing a traffic nightmare overnight.

A severe thunderstorm watch has been issued for parts of Michigan and Indiana, including Detroit and Fort Wayne. ABC’s senior meteorologist Melissa Griffin tracks the latest weather news.

A Florida woman is speaking out after she survived an EF-1 tornado that lifted her house off its foundation while she was inside.

More severe weather is expected for the upper Midwest while millions of Americans are looking for relief from the record-breaking heat.

A Florida woman was in her mobile home when a tornado lifted it off its foundation, leaving her clinging for her life.

After 24 hours of extreme weather, powerful storms are tearing through much of the Northern Plains. More than a dozen tornadoes have been reported in several states.

A storm chaser got a close-up look at a powerful tornado that destroyed homes in Valley City, North Dakota, last week.

Severe storms with reported tornadoes are targeting the Southeast and the Midwest.

A dozen tornadoes were reported in multiple states, from Florida all the way up to Minnesota.

Philadelphia residents saw a heat index of 106 degrees, marking the third day of triple digit temperatures.

Officials said It was a "bright and sunny day" when the lighting strike hit the water.

The first major heat wave of the summer will bring another day of dangerously high temperatures to the East Coast on Wednesday before relief moves in.

More than 120 million Americans remain under heat alerts Wednesday as record-breaking temperatures and dangerous humidity grip the East Coast.

More than 120 million Americans are on alert for record-breaking temperatures as the first major heat wave of the season sweeps across the U.S.

A life-threatening heat wave has enveloped the East Coast, hitting major cities with the worst of the high temperatures on Tuesday before relief moves in.

The first major and widespread heat wave of the season has put over 150 million Americans from Mississippi to Massachusetts under life-threatening heat conditions.

The northern lights are expected to dazzle the night sky, with Alaska likely to have the best view of the aurora’s green, blue and purple hues.

See meteorologist tips to stay safe from storms with lightning this summer, especially on the beach.

Extreme heat makes it especially hard for your body to cool down, so you need to be extra careful if you exercise or play sports when it’s baking outside

Cities like Philadelphia and New York are bracing to see temperatures top 100 degrees.

The National Hurricane Center says Tropical Storm Andrea has formed in the Atlantic Ocean

Life-threatening heat is enveloping the eastern U.S., with some cities bracing for what could be their highest temperatures in over a decade.

ABC News Chief Meteorologist Ginger Zee has more on the extreme heat and how long it will hang around.

A heat wave is bringing oppressive heat and humidity to nearly half the country. At a high school graduation in Paterson, NJ, over 160 people were treated for heat-related illnesses.

A dangerous heat wave has set in over roughly half of the nation, leaving nearly 150 million people from Texas to Maine under heat alerts on Monday.

A dangerous heat wave has set in over roughly half of the nation, leaving nearly 150 million people from Texas to Maine under heat alerts on Monday.

The extreme heat brings a brutal start to the week for tens of millions Americans. ABC News Chief Meteorologist Ginger Zee has the forecast.

There are 150 million Americans on alert ahead of the extreme heat event, meanwhile heavy rain triggered dangerous flash flooding in central New York.

Tens of millions of Americans are under heat advisories as extreme heat hits several parts of the country this week, especially the northeast.

Dangerous weather alerts, including deadly tornadoes, impacting millions of Americans in nearly half the country with many bracing for dangerous heatwaves from the heartlands to the East Coast.

At least three people are dead in North Dakota after severe weather swept across the region on Friday night, authorities said.

A dangerous heat wave is sweeping from the Midwest to the Northeast, putting over 100 million at risk. Here's how to stay safe in the extreme temperatures.

ABC News' meteorologist Greg Dutra talks extreme heat risk heading towards the East Coast next week.