It may be a day late, but as of Saturday evening, the National Weather Service is warning that the region will be socked with a very white Christmas, plus one, from Sunday into Monday.

The coastal storm, which the NWS has been tracking for the last few days, is upgraded to blizzard status, with a warning in effect for southwestern Connecticut from 6 a.m. Sunday through 6 p.m. Monday.

The snow is expected to start falling Sunday morning, intensifying after 9 a.m. Thunder is also possible at times. There will be a northeast wind between 11 and 21 mph, with gusts as high as 33 mph. Initial snowfall during the daytime could be 3 to 5 inches possible, the NWS predicts.

Snow will continue Sunday night, and it could be heavy at times. Temperatures will plunge to the mid-20s, and it will be windy with gusts as high as 46 mph. Snowfall through nighttime could amount to 6 to 10 inches.

And Monday should see more snowfall, according to the NWS, mainly before 3 p.m. The daytime high is expected to be only 29 degrees. The windy conditions will also continue Monday, out of the northwest clocked between 28 and 30 mph, with gusts as high as 44 mph.