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Video footage showed a fireball with a long tail hurtling across a cloudless sky in the Pittsburgh area.

The universities that oversee the National Center for Atmospheric Research allege in the suit that the center is "collateral damage" in the Trump administration's ongoing feud with Colorado Gov. Jared Polis.

Arizona and Nevada are likely to see temperatures in the triple digits. New records could be set in San Francisco, Los Angeles, Tucson, Phoenix, Las Vegas, Albuquerque and Denver.

The satellite, launched 14 years ago, will make an uncontrolled re-entry Tuesday evening. NASA puts the risk of harm to anyone on Earth at "approximately 1 in 4,200."

A "herculean" goal to replenish the water in Utah's Great Salt Lake by the 2034 Olympics is gaining momentum and attracting strange bedfellows.

The pygmy long-fingered possum and the ring-tailed glider, until now known only through fossils, have been rediscovered.

The bill aims to create a national weather safety board to investigate deadly disasters and recommend changes for the future. It would be styled after the National Transportation Safety Board.

The snowpack is well below average in nearly all Western states, as higher-than-usual temperatures make for a warm, dry winter.