Seven people were airlifted by the Coast Guard 100 miles off the coast in Tampa Bay, Florida, after lightning struck their boat. No one was critically injured.

An earthquake is caused when two blocks of Earth's crust slip past each other on a fault plane, according to the U.S. Geological Survey.

Millions of Americans had already been given a taste of sweltering temperatures, and it's forecast to stay that way.

Millions of people in the South and West face triple-digit temperatures on Sunday as they look forward to some relief in a few days.

Around the country, heat contributes to some 1,500 deaths annually.

Another heat wave is stretching across the country as the West Coast is expected to climb in temperatures into the weekend.

Hundreds of people are severely hurt each year from lightning strikes, according to the National Weather Service.

About 20 people are killed by lightning each year in the United States, according to the National Weather Service. Hundreds are severely hurt each year.

Powerful wind gusts and torrential rain are expected in Fredericksburg, Virginia, and the dangerous heat wave continues for millions in more than a dozen states.

Yellowstone has partial reopening after major flood damage

The heat index is forecast to skyrocket Wednesday to 100 degrees in Atlanta.

Extreme heat is closing the gates to the Atlanta Zoo early on Wednesday and Thursday.

Extended drought conditions in several Mediterranean countries, a heat wave last week that reached northern Germany and high fuel costs for aircraft needed to fight wildfires have heightened concerns across Europe this summer

A heat wave is moving east and bringing the hottest weather in a decade to the upper Midwest, northern Plains and Gulf Coast on Monday.

The summer solstice has arrived and is bringing record-breaking temperatures to a large swath of the country.

Record-breaking heat is expected on Tuesday, with multiple regions seeing temperatures in the triple-digits, posing a potential health threat to millions.

A heat wave currently hitting the Midwest with triple-digit temperatures is headed for the South later this week.

Summer is in full swing as sweltering temperatures are expected to continue for millions around the country over the next several days.

The central U.S. is facing extreme heat on Monday, with temperatures forecast to skyrocket to 106 degrees in Minneapolis, 104 in Omaha, 104 in Dallas and 103 in Houston.

More than 10 million Americans are under heat alerts, with the central United States facing temperatures near 100 degrees.

Cooler temperatures are helping firefighters stabilize a wildfire in northwestern Spain that reports say is the biggest on record in the country

Water restrictions in the West are becoming commonplace as the megadrought intensifies and reservoir levels continue to recede -- including on golf courses.

Another heat wave is expected to bring near triple-digit temperatures to the South this week.

Parts of the South will see temperatures hit close to 100 degrees this week, prompting concerns of wildfires.

Hot, dry and windy conditions will increase fire danger in the Southwest.

Europeans are flocking to parks and pools for a bit of respite from a heat wave.

After extreme heat struck the Southwest and western U.S. and the Midwest saw tornadoes, strong winds and hail are due for Northeast.

An estimated 185,000 children in eastern Ethiopia are suffering from severe malnutrition as the region experiences a “once-in-a-lifetime” drought.

Kansas cattle dying amid national heat wave

After days of heavy rain and rapid snow melt, ​parts of Yellowstone National Park may be closed for the season ​as bordering towns brace for more potential flooding of the Yellowstone River.

ABC News’ Sam Champion has the latest on the severe weather that is on the move after striking the Midwest with at least two reported tornadoes touching down overnight.

Residents of the West Texas city of Odessa have been improvising emergency water supplies after a water system outage left them high and dry for days amid scorching heat, even as utility crews scrambled to restore normal service

At the height of tourist season, the park has had to close all of its entrances because of the flood damage.

Schools are closing down because of the record-high temperatures.

Flooding has wiped out roads and bridges and closed off all entrances to Yellowstone National Park at the onset of the busy summer tourist season

Officials say portions of the park are "likely to remain closed for a substantial period of time" after infrastructure was severely impacted by heavy rain and rapidly melting snow.

ABC News' Ginger Zee shares the latest as dangerous temperatures stretch across most of the country and why officials are warning people to stay safe.

Historic floodwaters that raged through Yellowstone National Park may have permanently altered the course of a popular fishing river and left the sweeping landscape forever changed

Heavy rain and near-record high temperatures caused flooding and the closure of Yellowstone National Park. Severe heat has fueled severe storms from Chicago to Texas.

Some of the most important water sources in the Western U.S. are drying up as a decades-long megadrought continues to intensify and temperatures steadily rise.

Dr. Jenn advises viewers how much water they should be drinking every day to stay hydrated.

All entrances to the national park have been temporarily closed in the wake of "unprecedented" rainfall, intense flooding and treacherous rockslides.

A third of the U.S. population will experience heat advisories on Tuesday and Wednesday.

All Yellowstone National Park entrances are in closed in the wake of "substantial flooding, rockslides and mudslides on roadways."

ABC News chief meteorologist Ginger Zee reports as 27 states, from California to Virginia, are under heat advisory, heat warning and heat watch.

Texas set a power demand record during a record-breaking heat wave.

Millions of Americans received excessive heat warnings as states across the Southeast and West saw record-breaking temperatures.

Drone footage showcased some late-season snow dusting Big Cottonwood Canyon in Utah on Memorial Day.

ABC News' Ginger Zee has the latest forecast on the blazes igniting in the West, from Arizona to Southern California, and the 100 million Americans on alert for dangerous heat.

Tens of millions of residents in the Southwestern U.S. are experiencing dangerous heat, with triple-digit temperatures blanketing much of the region.