A frontal wave developed in the lower Ohio River Valley on the 18th and lifted northeastward towards Lake Erie. Cold air damming remained entrenched and secondary low pressure began developing farther east along the warm front, south of New England. This low slowly strengthened as it moved east northeastward just over the tip of Cape Cod. While snow overspread the entire area, the mid level warm front was able to advance into southern New Hampshire and changed precipitation over to sleet and freezing rain. The heaviest snowfall ran roughly west to east through the Lakes Region.

Winter Storm in NORTHERN GRAFTON, NEW HAMPSHIRE
From 18-DEC-21 12:00:00 to 19-DEC-21 04:00:00 (EST-5)
Reported by: Trained Spotter

Snow overspread the White Mountains by midday on the 18th. Snow became moderate in the evening but otherwise remained light for the duration of the storm. Snow tapered off early in the morning on the 19th, finally ending as a couple of waves of light snow enhanced by upsloping winds over the mountains. Storm total snowfall ranged from 5 to 7 inches.

Winter Storm in NORTHERN COOS, NEW HAMPSHIRE
From 18-DEC-21 16:00:00 to 19-DEC-21 07:00:00 (EST-5)
Reported by: Trained Spotter

Snow overspread the North Country by mid afternoon on the 18th. Snow became moderate in the evening but otherwise remained light for the duration of the storm. Snow tapered off in the morning on the 19th, finally ending as a couple of waves of light snow enhanced by upsloping winds over the mountains. Storm total snowfall ranged from 4 to 7 inches.

Winter Storm in SOUTHERN COOS, NEW HAMPSHIRE
From 18-DEC-21 14:00:00 to 19-DEC-21 07:00:00 (EST-5)
Reported by: Trained Spotter

Snow overspread the North Country by mid afternoon on the 18th. Snow became moderate in the evening but otherwise remained light for the duration of the storm. Snow tapered off in the morning on the 19th, finally ending as a couple of waves of light snow enhanced by upsloping winds over the mountains. Storm total snowfall ranged from 4 to 7 inches.

Winter Storm in NORTHERN CARROLL, NEW HAMPSHIRE
From 18-DEC-21 13:00:00 to 19-DEC-21 07:00:00 (EST-5)
Reported by: Trained Spotter

Snow overspread the White Mountains by early afternoon on the 18th. Snow became moderate in the evening but otherwise remained light for the duration of the storm. Snow tapered off in the morning on the 19th, finally ending as a couple of waves of light snow enhanced by upsloping winds over the mountains. Storm total snowfall ranged from 5 to 7 inches.

Winter Storm in SOUTHERN CARROLL, NEW HAMPSHIRE
From 18-DEC-21 13:00:00 to 19-DEC-21 04:00:00 (EST-5)
Reported by: Trained Spotter

Snow overspread the Lakes Region early in the afternoon on the 18th. Snow became moderate in the evening but otherwise remained light for the duration of the storm. Snow tapered off on the morning of the 19th. Storm total snowfall ranged from 6 to 8 inches.

Winter Storm in BELKNAP, NEW HAMPSHIRE
From 18-DEC-21 13:00:00 to 19-DEC-21 04:00:00 (EST-5)
Reported by: Trained Spotter

Snow overspread the Lakes Region early in the afternoon on the 18th. Snow became moderate in the evening but otherwise remained light for the duration of the storm. After midnight on the 19th snow began to mix with sleet and freezing rain south of Lake Winnipesaukee. Precipitation tapered off early on the morning of the 19th. Storm total snowfall ranged from 7 inches near and north of Lake Winnipesaukee to 4 inches south of Route 140.

Winter Storm in SOUTHERN GRAFTON, NEW HAMPSHIRE
From 18-DEC-21 12:00:00 to 19-DEC-21 04:00:00 (EST-5)
Reported by: Trained Spotter

Snow overspread the southern White Mountains by midday on the 18th. Snow became moderate in the evening but otherwise remained light for the duration of the storm. Snow tapered off early in the morning on the 19th, finally ending as a couple of waves of light snow enhanced by upsloping winds over the mountains. Storm total snowfall ranged from 6 to 8 inches.

Winter Storm in SULLIVAN, NEW HAMPSHIRE
From 18-DEC-21 13:00:00 to 19-DEC-21 04:00:00 (EST-5)
Reported by: Trained Spotter

Snow overspread western New Hampshire early in the afternoon on the 18th. Snow became moderate in the evening but otherwise remained light for the duration of the storm. After midnight on the 19th snow began to mix with sleet and freezing rain south of Interstate 89. Precipitation tapered off early on the morning of the 19th. Storm total snowfall ranged from 7 inches near the Grafton County line to 4 inches near Pillsbury State Park.