On Wednesday, the U.S. mainland saw record-high temperatures, while Hawaii's mountaintops received several inches of snow. Meanwhile, residents in the Great Plains prepared for possible tornadoes. 

Several inches of snow fell across high elevations of Hawail's Big Island just a day before Halloween

ABC News’ Marcus Moore has the latest on the emergency response and search and rescue efforts.

Three regions, including Andalucia and Valencia, were under Red Alerts on Wednesday.

Trick-or-treaters could possibly hit the streets in record heat across the Northeast. WLS-TV Chicago meteorologist Cheryl Scott reports.

Unseasonably warm air heading East next week could make for a hotter-than-average Halloween in New York, Philadelphia, the Raleigh-Durham metro area and Atlanta.

The number of dead and missing in massive flooding and landslides in the Philippines has reached nearly 130 and the president says many areas remain isolated

Hurricane forecasting has made tremendous strides in recent decades.

ABC News’ Ginger Zee is tracking the summer-like temperatures across the country.

In the continental U.S., some of the best places to see the northern lights are Michigan's Upper Peninsula and North Dakota.

First responders and the National Guard rescued hundreds of people overnight in New Mexico. WABC meteorologist Dani Beckstrom reports.

Roswell, New Mexico, experienced an overnight Flash Flood Emergency into Sunday morning, the National Weather Service reported.

Residents of parts of upstate New York and Vermont awoke to winter-like weather Thursday.

Temperatures may be starting to drop, but hurricane season is far from over.

Dangerous, record-breaking heat is ongoing in the West, with Phoenix's temperature reaching the triple digits every day for the last three weeks.

Storm surge is a major threat from Hurricane Milton, which is set to make landfall on Florida's west coast as a Category 4 hurricane Wednesday night.

The Southeast is still recovering from Hurricane Helene, and now a developing storm in the Gulf is expected to bring heavy rain and flooding to Florida.

When visitors venture to the parks on days when temperatures exceed triple digits, they are not only are they putting themselves at risk, but the park rangers as well.

Football season may be in full swing, but federal emergency planners have designated another purpose for NFL stadiums other than games: emergency shelters.

Human-amplified climate change is making it more likely that extreme heat lasts longer into fall, as record-breaking temperatures blanket much of the western U.S.

With some areas experiencing triple-digit heat this week, an excessive heat warning is in effect through Thursday evening.

ABC News’ Ginger Zee has the latest track of the new tropical threat.

Idalia is the strongest hurricane to make landfall in Florida's Apalachee Bay region ever on record. Here is a look at the most powerful storms to hit the U.S. mainland.

A third house has collapsed in four days on the North Carolina coast as officials closed off the beach due to dangerous debris on the shore and in the water.

Millions brace for what's expected to strengthen to a major Category 3 hurricane by Thursday morning. Mandatory evacuations are in place for low-lying areas and barrier islands in the Gulf of Mexico.

ABC News’ Ginger Zee has the latest on the tropical threat taking shape as it prepares to make landfall later this week.

A potential hurricane -- which would be named Helene -- is churning in the Caribbean and is forecast to make landfall along the Florida Panhandle on Thursday.

Deaths related to extreme temperatures are on the rise, and minority populations are being disproportionately affected, according to a new JAMA study. Dr. Darien Sutton explains.

ABC News’ Ginger Zee is tracking the storm and tornado threat taking shape around the Gulf.

Thunderstorms are in the forecast across parts of the central United States as a summer-like pattern continues to deliver hot temperatures and scattered severe weather.

The severe storms may bring flooding from the Plains to the Midwest on Saturday.

By 2065, researchers predict that deaths from extreme temperatures could reach 19,300 in the lower greenhouse gas emissions scenario, and 26,500 with higher emissions.

Two tornadoes were reported near Duluth, Minnesota, with at least one fatality. Heavy rain moving from Kansas City to Chicago to Pittsburgh.

A busy series of northern lights activity will soon come to a peak as the sun reaches the solar maximum stage in the coming months.

Expect a coastal low to move north across the Carolinas toward the mid-Atlantic over the next day, potentially causing flooding.

ABC News Chief Meteorologist Ginger Zee tracks where this storm is heading next after bringing more than 18 inches of rain to parts of North and South Carolina.

Life-threatening flash flooding from a powerful, slow-moving storm system dumped more than a foot and a half of rain on parts of the Carolinas.

A system off the coast of the Carolinas is pummeling North Carolina with historic rainfall and life-threatening flooding.

The North Carolina coast is experiencing historic rainfall, and a state of emergency has been declared for Carolina Beach, North Carolina, where 18 inches of rain has already been reported.

More than 18 inches of rain has been recorded in Carolina Beach, North Carolina.

ABC News chief meteorologist Ginger Zee has the latest on the tropical storm threat, which is slamming the coast with heavy rain and potential flooding.

ABC News' meteorologist Somara Theodore tracks a new tropical threat brewing off the southeastern coast just days after Hurricane Francine made landfall in Louisiana.

Up to 8 inches of rain are possible in some areas.

ABC News chief meteorologist Ginger Zee is tracking the latest as Francine, now a tropical depression, brings heavy rains and a flash flood threat across the region.

Tropical Storm Francine is now a Category 1 hurricane.

The storm blew inland after making landfall southwest of New Orleans late Wednesday as a Category 2 hurricane before quickly slowing down to become a tropical storm. No fatalities have been reported.

It's expected to make landfall in Louisiana on Wednesday afternoon as a Category 1 hurricane. Flash flooding is expected in Louisiana and Mississippi through Wednesday night.

ABC News’ chief meteorologist Ginger Zee has the latest on the storm system, which is expected to strengthen before making landfall tomorrow.

Tropical Storm Francine is churning in the Gulf and is expected to become a hurricane Monday night.

Francine is likely to become a hurricane on Tuesday and is expected to make landfall Wednesday in Louisiana as a Category 2 storm with 100 mph winds.