An unusually early and long-lasting heat wave has brought more triple-digit temperatures to a large swath of the U.S. West

The system may become a significant storm in the coming days.

ABC News' Rob Marciano reports on the extreme heat, wildfires and tropical threat in the forecast.

The heat wave pummeling the West won't be leaving this week.

Dangerous, record-busting heat is spreading across the U.S. Southwest and into parts of Utah, Montana and Wyoming

A pilot got a very up-close view of a funnel cloud while flying over Grady County, Oklahoma.

Rising temperatures in the region are shrinking some of the most important reservoirs in the U.S.

The second named storm of this year’s hurricane season, Tropical Storm Bill, has strengthened slightly far off the U.S. Eastern seaboard

As a dangerous heat wave hits the West, here are tips from the Centers for Disease Control and Prevention for how to keep yourself safe in the heat.

The Texas corporation that operates the state's electric grid is asking residents to conserve energy for the rest of the week due to the heat wave.

The Texas corporation that operates the state's electric grid is asking residents to conserve energy for the rest of the week due to the heat wave.

Ginger Zee tracks dangerous record heat in the West and it's link to climate change.

A dangerous heat wave is spreading across the West from California to Utah.

Over the weekend, at least four major U.S. cities experienced mass shootings that left dozens of people wounded and six people dead.

A dangerous heat wave is building in the West while the East begins to cool down.

Heat alerts are in effect for 36 million people across six Southwest states ahead of a major heat wave.

Heat warnings are in effect for 36 million people across six southwestern states.

Sam Champion has the latest forecast after severe thunderstorms led to flooding in Southern states.

Texas Gov. Greg Abbott has signed bills to reform the state's power grid in response to the disastrous energy crisis that resulted from a pair of severe winter storms.

Rob Marciano reports on the millions dealing with flash flooding, storms and lingering heat.

Three straight days of 90-degree temperatures and storms will give way to cooler weather in the Northeast later this week. In Arkansas, there is potential for severe storms.

Rob Marciano tracks the ongoing heat wave and severe weather in parts of the U.S.

The first heat wave of the season has struck the Midwest as scorching temperatures also invade the Northeast.

Rob Marciano has the latest forecast as record-breaking heat hits the Northeast and Midwest.

Record-breaking heat spreads across Northeast; flash floods, fire danger elsewhere in US

The weekend scorcher meant beaches were packed up and down the East Coast.

Temperatures expected to rise into the 90s from Minnesota to New Hampshire today.

The Louisiana community is still recovering and awaiting federal aid after being hit with two hurricanes, an ice storm, and a flood – all within 9 months.

A powerful heat wave is moving across the country, while powerful storms hit the South.

After damaging reports of storms in the Northeast, Americans are getting ready for the first heat wave of the season, from the Midwest to the Northeast.

A magnitude 5.9 earthquake struck off the coast of Oregon early Friday, and the aftershocks included another 5.9 quake

Lighting struck in the sky over Del Rio, Texas, amid severe thunderstorms and heavy rain that moved through Texas.

Ginger Zee reports on the latest forecast after a storm system brought heavy rain to the state of Texas on Sunday.

A heat wave is pounding the West where scorching temperatures will reach Washington state, Oregon, California, Nevada, Utah and Arizona on Tuesday.

Houston residents and officials are seething over a Texas agency's decision to not award the city a single cent of the initial $1 billion in federal flood mitigation funding the state was promised following Hurricane Harvey in 2017

A heat wave is pounding the West where scorching temperatures will reach Washington state, Oregon, California, Nevada, Utah and Arizona on Tuesday.

A dangerous heat wave is invading the West bringing triple digit temperatures on Memorial Day.

Houston residents and officials are seething over a Texas agency's decision to not award the city a single cent of the initial $1 billion in federal flood mitigation funding the state was promised following Hurricane Harvey in 2017

Several hundred people in New Zealand have been evacuated from their homes after heavy rain caused widespread flooding in the Canterbury region

A few more batches of heavy rain are expected in the Northeast today, and some isolated flooding will be possible.

Record-cold temperatures grip Northeast Memorial Day weekend. Why is it so cold?

Torrential rain is slamming millions from the South to the East Coast.

Storm clouds and lightning created a striking scene near Goodland, Kansas.

The Northeast and the Plains are bracing for severe weather Wednesday as two storm systems move in.

The race to fix Texas' power grid after deadly blackouts is almost out of time.

The Northeast and the Plains are bracing for severe weather Wednesday as two storm systems move in.

There have been 15 reported tornadoes in the past 24 hours in Kansas. The storm threat is headed to the Northeast and could bring damaging winds and large hail.

Hundreds of homes are under mandatory evacuation after flood barriers were breached Friday morning in a rural southeastern Louisiana parish outside of Baton Rouge.

Chief meteorologist Ginger Zee has the latest forecast on what looks to be a very active hurricane season, with the first potential named storm of 2021 already making waves.

There are flash flood warnings and watches in Texas and Louisiana for the fourth straight day. The first named storm of hurricane season could be forming in the Atlantic.