A key site that monitors global carbon-dioxide emissions went offline for maintenance and will return later Wednesday, according to the National Oceanic and Atmospheric Administration.

Mauna Loa, the world's largest active volcano, is the mighty giant of Hawaii that's still bubbling away, waiting to be explored.

A winter storm will bring severe weather across Hawaii beginning on Thursday, with impacts expected until Saturday morning.

The Pliocene epoch, which lasted from 5.3 million to 2.6 million years ago, was a consequential time in Earth's history. The ...

The current episode will probably last 10 to 20 hours, the observatory said. Hawaii Volcanoes National Park encompasses the ...

The USGS Hawaiian Volcano Observatory spearheads Volcano Awareness Month each January on the Island of Hawaii. This year, in ...

When you think about Hawaii, what comes to mind? Warm beaches, swaying palm trees and pineapples? Probably not a blizzard. But this week, meteorologists say hurricane-force winds and 2 feet of snow ...

the observatory said.Hawaii Volcanoes National Park encompasses the summits of two of the world’s most active volcanoes: Kilauea and Mauna Loa.The eruption is visible from many public overlooks ...