Earth’s magnetic north is not static. Like an anchorless buoy pushed by ocean waves, the magnetic field is constantly on the move as liquid iron sloshes around in the planet’s outer core.

Much of the U.S. from the Rockies into the Northern Plains will see colder than normal temperatures starting Sunday into the ...

As the polar vortex begins to retreat, the region will see a gradual return to typical winter conditions. Long-range forecasts suggest the coldest air will move out by mid- to late-January, according ...