Gov. Phil Murphy​ declared a State of Emergency across 21 counties in New Jersey that will be in effect at 8 a.m. Sunday.

Most of the tri-state was scheduled to be under a winter storm warning by the afternoon, when conditions pick up and heavy snow bands could drop as much as an inch of snow per hour. For some, it’ll be the most snow in nearly three years.

The Lehigh Valley is under a winter storm warning Sunday for 4-8 inches of snow. Here’s when it will start and what to expect.

The snow started falling in the early afternoon and will become heavier in the early evening, according to the National Weather Service.

The NYC area is forecast to see significant snow on Sunday as New Jersey declares a state of emergency. Here's how much to expect, when the storm will stop and end, plus how to track live coverage:

A winter storm will affect New York and the surrounding area starting Sunday. From 1 p.m. Sunday to 4 a.m. Monday, the tri-state area is expected to be hit with snow, according to the National Weather Service.

Buckle up for a topsy-turvy weekend of weather – starting with a warm surge and ending with accumulating snow. See that latest projected snow totals and timing of the storm, which will impact Monday morning’s commutes.

NEW YORK — New York, New Jersey and Connecticut are under winter storm warnings Sunday as the entire region braces for snow. Tri-State Area officials had been issuing warnings and discussing the states' preparations in the days leading up to the storm.

A powerful winter storm barreling toward the Northeast from the south that is likely to be the biggest snowstorm in years for many location will be followed by a dramatic drop in temperatures.Here's the latest as of Sunday morning,

With a winter storm moving in, New Jersey is under a State of Emergency Sunday morning.  The State of Emergency, declared by Gov. Phil Murphy, went into effect at 8 a.m.

A polar vortex is slated to sweep most of the continental US bringing winter storm warnings and a hazardous freeze to millions.