The relentless early-season cold isn't letting up, as another shot of frigid temperatures is plunging into the country. Here's when it will arrive, who it will affect and how cold it will get.

A mix of snow, ice and rain will impact the mid-Atlantic today before tapering off from west to east this afternoon/evening. One to 4 inches of snow appears likely for many including Richmond and Roanoke. Washington D.C. could see around 1 inch, which would make it their first measurable snow of the season. Freezing rain may also result in a light glaze of ice, so please use caution and allow for some extra travel time during your morning and evening commutes. Watch this video for the latest update.

This week, the king tides are causing havoc in Northern California. With particularly high waves crashing along the shoreline, dangerous conditions and flooding have become a threat.

The Surface Water Ocean Topography satellite captured high resolution measurements of this summer’s Pacific tsunami. The satellite imagery is the first of its kind, bringing new detail and insight to how these massive waves form.

Population density, differences in temperatures and the tracks of winter storms can bring major uncertainties into the forecast.