Axios

The famous Keeling Curve may soon have a rare data gap.

Driving the news: The Mauna Loa eruption on Monday cut power to the observatory where atmospheric carbon dioxide levels are measured, according to the Scripps Institution of Oceanography.

An outbreak of severe thunderstorms and tornados wrought damage on the southeastern U.S. overnight, with officials warning of continued risk on Wednesday.

Driving the news: Tornado warnings were in effect through 6am Wednesday for central and western Alabama and southeastern Mississippi, according to the National Oceanic and Atmospheric Administration's (NOAA) Storm Prediction Center.

A significant outbreak of severe thunderstorms, including a "few strong tornadoes," is unfolding for the Mississippi Valley, mid-South and parts of the Southeast Tuesday into Tuesday night.

Threat level: The storm threat is highest — at "moderate risk" or a level 4 out of 5 on the National Weather Service's (NWS) scale — in Mississippi. About 40 million people across the South are at risk for severe weather from this event, per the National Weather Service.

Lava continued to flow from Hawaii's Mauna Loa volcano on Tuesday, though authorities stress that the erupting volcano isn't threatening local communities.

The big picture: Mauna Loa, the world's largest active volcano, erupted for the first time since 1984 late Sunday night.