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

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.

A heat wave is moving in, with over 100 million people from the Midwest to the Northeast on alert for life-threatening heat this weekend and into next week.

In New York City, a teenager was struck by lightning in Central Park Thursday afternoon, police said. The boy is alert and conscious, police said.

A 15-year-old was struck by lightning in New York City's Central Park as severe thunderstorms hammered the Northeast on Thursday.

ABC News’ Chief Meteorologist Ginger Zee reports after severe storms hit the East Coast and over 100 million people are on alert as dangerous heat moves across the country this weekend.

Life-threatening temperatures are heading to the East Coast.

Police say a 15-year-old boy was struck by lightning in NYC and is alert and conscious.

Heavy rain, flooding and a rock slide have again closed a section of the major cross country highway Interstate 40 along its narrow corridor through the Great Smoky Mountains

ABC News Chief Meteorologist Ginger Zee has the latest track and timing as severe weather targets major cities along the East Coast.

A multi-day severe weather outbreak is hammering the Heartland and headed towards the East Coast with tornado watches in effect.

Heat is the number one killer -- and it’s heading to the most densely populated part of America for a prolonged period.

Temperatures are expected to be in the low-100s.

ABC News’ Chief Meteorologist Ginger Zee shares the latest on the dangerous storms on the move after parts of the Heartland were hit hard overnight.

Eight people are dead from the heavy rains and devastating flash flooding in West Virginia.

Powerful storms are threatening millions after a tornado outbreak across the Plains, where over a dozen tornadoes were reported in three states.

At least 16 tornadoes were reported from Colorado to Minnesota but, luckily, no widespread damage was reported.

ABC News’ Alex Perez reports on the fallout in the wake of heavy rain and devastating flash flooding in West Virginia.

Families from West Virginia to the Carolinas are on alert for more floods.

Parts of West Virginia are under a state of emergency after deadly flash flooding killed at least five people, including a 3-year-old.

There is a state of emergency in West Virgina where at least three people are dead and several missing from flash flooding Saturday night.

The death toll from heavy rains that inundated parts of San Antonio has risen to 13, and all those missing have been found

The first ever heat advisory has been issued in the state of Alaska

At least 11 people were killed in flooding that swept vehicles off the road and led to dozens of high-water rescues, authorities in San Antonio said Friday.

The fatalities were reported in northeast San Antonio in the Loop 410 area on Thursday morning, police said.

At least four people are dead after torrential rain and devastating floods inundated parts of Texas overnight. Firefighters in San Antonio made at least 60 high water rescues.

Smoke from Canadian wildfires is drifting east, triggering air quality alerts in parts of the Midwest and Northeast.

At least four people are dead in San Antonio and dozens of water rescues were made around the city after heavy rains flooded highways and stranded motorists, officials said Thursday

About 24 million people in Texas, Louisiana, Arkansas and Oklahoma are under a flash flood risk or flood watch as abundant moisture flows from the Gulf.

Tropical Storm Barbara continues to weaken as it heads northwest away from land and is likely to dissipate by Wednesday

More than 50 million people are on alert for severe storms from Texas to New York.

More than 50 million people from Mississippi to western New York are under a slight risk Monday of receiving damaging wind, large-sized hail, flash flooding.

ABC News Chief Meteorologist Ginger Zee has the latest on the severe weather threat continuing for millions in the Southeast. 

The alert stretches from Texas to the East Coast. Storms turned deadly, killing at least two people in Georgia and Mississippi and tens of thousands were left without power across the South.

Two people were killed by falling trees as a line of severe storms pushed through the South over the weekend

More than 40 million Americans are in the threat zone through Saturday night, stretching from Texas to the Carolinas.

WABC's Dani Beckstrom reports on the severe weather expected for Texas and Oklahoma, with destructive winds, giant hail and possible tornadoes.

Parts of the South are reeling from severe thunderstorms, flooding and damaging winds. 

The storm system has ravaged the Heartland as the massive system heads east this weekend.

SEE IT: Heavy flooding hit the streets of Lubbock, Texas, after storms moved through the region.

ABC News’ Chief Meteorologist Ginger Zee tracks the latest forecast as tornadoes touch down in Texas and new storms take aim at the East Coast this weekend.

The girls's family was recording a storm unfolding in their hometown of Huntington Beach when they captured the moment lightning struck a tree approximately 50 feet from their daughter.

Smoke from the Canadian wildfires continues to bring potentially dangerous air quality to parts of the northern U.S., with hazy skies possible.

ABC News Chief Meteorologist Ginger Zee has the latest on the air quality alerts across the Midwest caused by smoke from the Canadian wildfires and the severe storms possible across the South.

The dust mass, which forms in the Sahara Desert in northern Africa and blows thousands of miles across the Atlantic Ocean, is forecast to arrive in Florida this week.

The dust mass, which forms in the Sahara Desert in northern Africa and blows thousands of miles across the Atlantic Ocean, is forecast to arrive in Florida this week.

ABC News’ Chief Meteorologist Ginger Zee reports on the destructive storms over the Heartland, with more storms on the way in the coming days.

Powerful storms and torrential rain are inundating the Heartland – including Kansas, where first responders in Wichita used a boat to save a driver that was surrounded by flood waters inside her car.