More than 4 million people remain under a flood watch through Saturday evening in Miami and Fort Lauderdale, Florida.

More rain is possible and a flood watch has been extended through Saturday following the torrential rainfall this week.

Thunderstorms are expected to affect millions of people from Washington, D.C., to Philadelphia and New York to Boston. Meanwhile, saturated South Florida is bracing for up to five more inches of rain.

South Florida is dealing with heavy rain and flooding, while damaging winds, hail and rain are expected in New York and Philadelphia.

Parts of South Florida face increased weather risks after reaching deadly flash flooding levels Wednesday.

Extreme flash flooding and life-threatening conditions have caused Gov. Ron DeSantis to declare a state of emergency. ABC News' Victor Oquendo joins the show from Hallandale Beach, near Miami.

Gov. Ron DeSantis declared a state of emergency in Florida after 25 inches of rain fell in the last 48 hours. A flood watch is in effect until Friday evening from Miami to West Palm Beach.

ABC News chief meteorologist Ginger Zee has the latest on the severe storms, while dangerous heat is set to sweep over much of the country.

Millions are under flood watches in South Florida as relentless extreme rain and possible life-threatening flooding soaks the area.

Heavy rains lashed much of Chile, damaging homes, flooding roads, knocking out power and causing mudslides that have swept through residential areas

"This heat wave will go down in history," Greece's state TV meteorologist said.

An unprecedentedly early-in-the-season heatwave in Greece has prompted officials to shutter schools and limit tourist attraction hours.

Over 2 feet of torrential rain is inundating South Florida, flooding neighborhoods, stranding drivers and shutting down roads.

Flooding emergency hits Florida with severe storms, while extreme heat is expected in the Midwest and Southwest.

A state of emergency was declared in Florida after 20 inches of rain accumulated in the last 48 hours.

ABC News’ Victor Oquendo reports on a state of emergency in Florida after life-threatening flash floods wreaked havoc on parts of the state.

ABC News’ chief meteorologist Ginger Zee shares the latest track and timing of the rain and flooding.

Sarasota, Florida, received more than half of a foot of rain in the span of a few hours.

Another round of life-threatening heat is slamming the West before heading to the East Coast.

Dangerously high temperatures are heading to the West.

A recent heat wave brought record-breaking temperatures to the southwestern United States, including major cities. The heat wave will continue this week as it moves toward the East Coast.

An Austrian Airlines flight hit a "thunderstorm cell” and the plane suffered significant damage from hail, which took off part of the airplane's nose, the airline said.

Near triple-digit temperatures are expected from Pheonix to Boston as a massive heat dome moves across the country.

ABC News Chief Meteorologist Ginger Zee is tracking the latest heat alerts after a weekend that saw numerous record temperature highs tied and broken.

Life-threatening heat is returning to the West before spreading to the East Coast later this week.

More sweltering heat appears to be headed to parts of Arizona and Nevada this week

Amid Mexico's heat wave and drought, suffering birds are getting air-conditioning and monkeys with heatstroke are being rescued by non-governmental groups

Records are expected to be broken in Florida this weekend as heat indices could exceed 110 degrees in some interior locations.

Severe weather shifts into eastern Colorado and Kansas on Saturday, with threats of large hail and damaging winds while record heat continues in Florida.

Temperatures will reach 110 degrees in Phoenix, 109 degrees in Las Vegas, 107 degrees in Tucson, 100 degrees in Albuquerque and 95 degrees in Dallas.

An early season heat dome is bringing life-threatening temperatures to Americans from California to Oregon to Florida.

An early season heat dome is bringing life-threatening temperatures to Americans from California to Oregon to Florida.

In the latest weather forecast, a new storm system hits the Midwest as heat advisories go into effect for much of the United States.

ABC News’ Sam Champion is tracking the latest storm systems, including one that hit the metro Orlando area that caused two reported tornadoes.

The National Weather Service issued five different tornado warnings across Maryland due to the severity of the storms.

Officials in Maryland said they were working to rescue people trapped inside at least three collapsed structures after a tornado touched down on Wednesday in Montgomery County.

A Flood Watch has been issued for Washington and Baltimore, and millions from the mid-Atlantic to the Northeast brace for wet weather.

As a heat wave envelops the West, 32 million people from Texas to California are on alert for life-threatening temperatures.

Temperatures in some parts of the South and West are expected to reach as high as 111 degrees.

A life-threatening heat wave is approaching the West, with temperatures expected to exceed 110 degrees from California to Nevada to Arizona.

ABC News’ Ginger Zee has the latest forecast as 25 million Americans are on alert for dangerous temperatures.

The temperatures in California and the Western United States are set to soar this week as a scorching heat dome settles over the region. This is expected to bring heightened fire danger.

ABC News’ Ginger Zee has the latest on the fire threat and the triple-digit temperatures expected for some parts.

A dangerous and possibly record-breaking heat wave is heading toward the West this week, impacting California to Las Vegas to Arizona.

Severe weather is impacting millions from the Plains to the South on Saturday.

ABC News weather correspondent Somara Theodore breaks down the latest aftermath of severe storms hitting the U.S. and what's to come.

The severe storm threat extends from Texas to Minnesota this weekend, bringing the potential for more tornadoes, damaging winds, and large hail.

A southwest Texas town experienced a sudden temperature drop and deep hail on Wednesday, requiring snowplows to clear the streets.

Marking the largest investigation into extreme heat and pregnancy to date, researchers analyzed 53 million births over 25 years.

A severe thunderstorm watch is currently in effect from Montana and the Dakotas to Colorado and strong storms are expected to move east through Wednesday night.