A rare "high risk" warning for flash flooding has been issued in Texas and Louisiana.

The high-risk area received over 600% of its normal rainfall in the past two weeks, and the National Oceanic and Atmospheric Administration has warned the flooding could be life-threatening.

Severe weather in three parts of the U.S. on Wednesday brought powerful thunderstorms with damaging wind gusts, large hail and possible tornadoes from the Plains to the East Coast.

Three people were killed in Louisiana -- including a pregnant woman and her unborn child -- due to severe weather on Monday, officials said.

As of Tuesday, 149 people were confirmed dead in the flood-stricken southern state, with 124 individuals remaining unaccounted for.

Three people, including a pregnant woman and her nine-month fetus, were killed in Louisiana due to severe weather on Monday, officials said.

New video shows tornadoes and severe storms ripping across the Ozarks to Louisiana.

A closer look at tree rings is adding to the growing list of evidence that shows unprecedented temperatures measured on Earth over the past year.

The National Oceanic and Atmospheric Administration (NOAA) predicts that a solar storm may cause auroras visible in Wisconsin, Minnesota, Michigan, Maine, and upstate New York.

Heavy rains and torrents of cold lava and mud flowing down a volcano's slopes on Indonesia’s Sumatra island have triggered flash floods

ABC News’ Somara Theodore reports on the storms brewing in the South with flooding rain and severe weather that will continue into the work week.

At least one person was killed and thousands were left without power after a storm with hurricane-force winds struck northwest Florida.

A severe solar storm has impacted the Earth, which could disturb communication systems and cause the Northern Lights to be visible over a large part of the United States.

The worst isn't over as flooding is set to continue through the weekend in Brazil, the governor said.

Hundreds of volunteers have set up a makeshift dog shelter in an abandoned, roofless warehouse in the Brazilian city of Canoas, one of the hardest hit by floods in southern Brazil’s Rio Grande do Sul state

ABC News’ Ginger Zee has the latest after nearly 100 tornadoes were reported across the United States this week.

The skiers are believed to have been buried by an avalanche in the backcountry, according to police.

A Brazilian horse that garnered widespread attention after a TV news helicopter spotted it stranded on a rooftop has been rescued, officials say.

Two skiers have been found dead, and one rescued, after an avalanche Thursday in the area of Lone Peak Summit in Utah.

The skiers went missing on Lone Peak, near Salt Lake City, officials said.

A strong solar storm expected to make the lights visible over a large part of the U.S. beginning Friday.

Deadly tornadoes left a path of destruction in the South as more than 60 million Americans brace for severe weather.

Puerto Rico has declared a state of emergency following heavy rains, widespread flooding and landslides in the U.S. territory

Severe storms are tearing through the central and southeast U.S., spawning damaging tornadoes, producing massive hail, and killing two people in Tennessee and another in North Carolina

Within the last 48 hours, at least 60 tornadoes were reported across 11 states.

Earth has just experienced its 11th-hottest month on record -- a preview of the brutal temperatures forecast for the summer, according to scientists.

Tuesday saw another 20 reported tornadoes across five states.

One million residents from Texas to Ohio are on alert.

The National Weather Service warned there was a "confirmed large and destructive tornado" over Union City at 6:11 p.m. ET Tuesday.

Michigan Gov. Gretchen Whitmer declared a state of emergency after at least nine tornadoes hit the area on Tuesday.

Michigan Gov. Gretchen Whitmer has declared a state of emergency in areas of Michigan due to the tornadoes that hit the area Tuesday.

At least one person is dead in Oklahoma after 16 tornadoes were reported in six states.

Life-threatening storms have turned deadly, leaving wide swaths of destruction as they sweep through states in the Heartland.

More than 20 million people were under a flood watch in Texas, Oklahoma and Arkansas over the weekend.

Potentially intense and historic tornadoes are in the forecast for Oklahoma and other nearby states on Monday, according to NOAA.

Houston residents are returning home as floodwaters recede after heavy rainfall caused significant damage and led to hundreds of rescues, including those stranded on rooftops.

Floodwaters in the Houston area and parts of Southeast Texas are starting to recede, allowing residents to begin returning to their homes and assess damages after days of heavy rainfall

Spring is bringing multiple tornado outbreaks across the country. ABC News' chief climate correspondent Ginger Zee explains if climate change plays a part.

ABC News' Somara Theodore reports on the relentless rain impacting Texas and tornados hitting Oklahoma. Plus, a look ahead for the next storm on the move.

The states are still recovering from deadly storms in April.

More than 20 million people are recovering after torrential rain hit parts of the South with at least one person reported dead.

ABC News’ chief meteorologist Ginger Zee is tracking the latest storm system moving into the Plains and the potential for severe weather.

More than 200 people rescued with some areas of Texas getting more than 20 inches of rain in a week.

ABC News’ Somara Theodore reports on the catastrophic weather conditions in Texas and Oklahoma, where close to 2 feet of rain has fallen in some areas over the last five days.

High waters flooded neighborhoods around Houston on Saturday following heavy rains that have already resulted in crews rescuing more than 400 people from homes, rooftops and roads engulfed in murky water

More than a foot of rain has fallen in some areas, leading to more than 300 water rescues by first responders and 21 million people remain under a flood threat.

A Texas police officer has died of injuries he suffered when a tornado struck his home

Several rivers in the Houston area are at major flood stage.

Residents were rescued after rising rivers, tornadoes and hail hit parts of the state.

A late-season storm is expected to hit the Sierra Nevada this weekend, bringing rain and mountain snow to Northern and Central California