Follow live updates as a winter storm is expected to bring heavy snowfall, icy roads and cold temperatures from the southern states to the Northeast.

Track all current severe weather warnings, watches and advisories for Cambridge on the interactive weather alerts page.

The National Weather Service released a winter storm warning at 12:38 p.m. on Friday valid from Saturday 7 p.m. until Monday 7 a.m. for Atlantic and Cape May counties.

We have two relatively new types in winter weather warnings, called extreme cold warnings and cold weather advisories. Let's look at what those mean, and where they are in effect this weekend.

This index, from NOAA's National Weather Service, attempts to scale the impacts from winter weather, taking into account factors such as snowfall, accumulated snow on rooftops, ice accumulation, the potential for a flash freeze, and blowing snow. Not all factors are in play in a given winter storm.

The major storm is set to hit starting on Jan. 23 and will stretch into the weekend, spreading snow and ice from the southern Plains to the Northeast.

The National Weather Service issues a litany of notices before and during inclement weather events. They can be important signals on how to respond.

A winter storm warning and an extreme cold warning are in effect for several Houston area counties ahead of plunging temperatures this weekend. Here's a look at the timing of the winter storm.