Editor's note: This article was updated at 5:33 p.m.

At 3:42 p.m., the National Weather Service updated the Winter Storm Watch to a Winter Storm Warning.

In addition, the NWS increased expected accumulation amounts to 6 to 10 inches. The storm is now expected to begin at 6am Sunday and last until 6am Monday.

The snow should begin around daybreak tomorrow, then become steadier and heavier towards mid-morning. Snow will continue, heavy at times, through the early evening hours Sunday.

Snow showers will taper late Sunday into early Monday morning.

Residents in a wide area, including Anne Arundel County, are urged to prepare for significant amounts of snow and strong winds. The new advisory stated that these conditions will make travel "very hazardous or impossible" tomorrow. 

2:50 p.m. Dec. 25

At 9:08 a.m. Dec. 25, the National Weather Service issued a Winter Storm Watch in effect from Christmas Day through late Sunday night.

The alert said that the Christmas Day storm is expected to move in from the south bringing snow accumulations of five inches or more. The storm is expected to arrive late tonight and continue through Sunday night or early Monday morning.

Temperatures should remain in the upper 20s and low 30s. Winds are expected to be from the north tonight, 10 to 15 mph, gusting to 30 mph on Sunday afternoon. 

In the storm alert, the NWS noted that there is a "potential for significant snow accumulations that my impact travel."