Arizona, New Mexico, Utah and Colorado prepared for heavy rain that could lead to life-threatening flooding.

A nor’easter in September is unusual. As its forecast took shape on Tuesday, there was still uncertainty over what it would do.

The storm is expected to stay mainly offshore as it moves north along the western coast of Mexico this week. It’s one of the strongest ever in that region.

Parts of Arizona and New Mexico were under flood watches through Wednesday night.

Many towns and cities recorded their highest readings of one pollutant, known as PM 2.5, in 20 years.

Forecasters warned that Illinois and Indiana faced the highest risk of severe storms throughout the day.

Snow in May is not rare in the Rocky Mountains. But this year, any snow at all is unusual.

Memphis is among the cities most at risk of tornadoes on Sunday. On Monday, the storm system will shift east.

Satellite images show the wide footprint of this storm, and explain why the snow fell where it did.

A combustible mix of weather ingredients has sparked worries about new fires in Oklahoma and Texas.

A fast-moving storm this weekend could drop new snow on the grimy piles that have accumulated across the city. Bitter cold will follow.

Snow that fell over parts of the Northeast on Saturday offered a preview of another storm that could bring even more snow on Sunday, extending as far south as Georgia.

Two storms moving through the Midwest and Northeast are being supercharged by a system on the West Coast. Blizzard warnings are in effect in West Virginia.

Hazardous construction materials, the buildings’ design and a series of safety failures likely enabled the blaze to spread with devastating speed.

The United States Geological Survey quickly deleted the alert, saying it had been sent in error.

A mix of snow and ice was beginning to fall across the Midwest and Northeast as tens of millions of people braced for a major winter storm.

Type in your community to see the full range of possibilities in the next few days.

Forecasters say a winter storm could disrupt travel, dumping up to a foot of snow across parts of the Midwest through the holiday weekend.

View the location of the quake’s epicenter and shake area.

Heavy rain would make a hurricane catastrophic. See the neighborhoods that could face the worst flooding.

The rain has been a stark contrast to very dry weather at the same time last year.

Parts of Los Angeles County will be under evacuation warnings starting Thursday evening as a complex storm system moves in.

Back-to-back storms this week could lead to flooding and power outages, forecasters warned.

As Hurricane Melissa barrels toward the island nation, only a fraction of residents have headed to evacuation centers.

The Great Storm of 1987 was a forecasting blunder that left at least 18 people dead, felled 15 million trees and caused a billion pounds worth of damage.

The Coast Guard and the Alaska National Guard were conducting search-and-rescue operations in two villages along the Bering Sea on Sunday.

Experts reassessed the damage from a tornado that left three people dead in June, and gave it the strongest possible rating on the tornado scale.

It’s too soon to know how Humberto could affect land. Another potential storm nearby is making for a complicated forecast.

Tropical Storm Humberto formed Wednesday, and another storm may form soon, but their potential effects remain fairly uncertain.