An upper low ejecting out of the Rockies ultimately phased with a northern stream shortwave trough leading to cyclogenesis off the East Coast on the 5th. Low pressure formed over the southern Appalachians and moved northeast towards Nantucket by the evening of the 5th. The storm tracked into the Gulf of Maine and eventually began weakening in the Bay of Fundy early on the 6th. While the radar presentation looked like a classic northern New England snow storm, the antecedent air mass was marginal for snow and precipitation type became elevation and/or precipitation rate dependent. Most notably the snow that did fall was wet and sticky. The wet snow bonded to trees which led to downed tree limbs and widespread power outages.

Winter Storm in NORTHERN COOS, NEW HAMPSHIRE
From 05-DEC-20 13:00:00 to 06-DEC-20 04:00:00 (EST-5)
Reported by: Trained Spotter

Snow moved into the North Country early afternoon on the 5th. Snow became moderate to occasionally heavy on northern edge of the precipitation shield through the late evening. Some downsloping winds and warmer temperatures resulted in significantly less snow in the Connecticut River Valley than the higher elevations. Snow totals ranged from around 2 inches in the valley to as much as 1 foot in the mountains.

Winter Storm in SOUTHERN COOS, NEW HAMPSHIRE
From 05-DEC-20 13:00:00 to 06-DEC-20 05:00:00 (EST-5)
Reported by: Trained Spotter

Snow moved into the North Country early afternoon on the 5th. Snow became moderate to occasionally heavy on northern edge of the precipitation shield through the late evening. Some downsloping winds and warmer temperatures resulted in significantly less snow in the Connecticut River Valley than the higher elevations. Snow totals ranged from around 2 inches in the valley to as much as 18 inches in the Presidentials.

Winter Storm in NORTHERN GRAFTON, NEW HAMPSHIRE
From 05-DEC-20 13:00:00 to 06-DEC-20 04:00:00 (EST-5)
Reported by: Trained Spotter

Snow moved into the White Mountains early afternoon on the 5th. Snow became moderate to occasionally heavy on northern edge of the precipitation shield through the late evening. Some downsloping winds and warmer temperatures resulted in significantly less snow in the Connecticut and Pemigewasset River Valleys than the higher elevations. Snow totals ranged from around 2 inches in the Connecticut Valley to as much as 15 inches in the mountains.

Winter Storm in SOUTHERN CARROLL, NEW HAMPSHIRE
From 05-DEC-20 12:00:00 to 06-DEC-20 03:00:00 (EST-5)
Reported by: Trained Spotter

Snow moved into the area early afternoon on the 5th. Snow became moderate to heavy through the late evening on northern edge of the most intense precipitation. Downsloping northeast winds and warmer temperatures resulted in significantly less snow in the valleys than the higher elevations. Snow totals ranged from 2 inches in the lower elevations to as much as 10 inches in the mountains.

Winter Storm in BELKNAP, NEW HAMPSHIRE
From 05-DEC-20 11:00:00 to 06-DEC-20 03:00:00 (EST-5)
Reported by: Trained Spotter

Snow moved into the Lakes Region early afternoon on the 5th. Snow became moderate to heavy through the late evening on edge of the most intense precipitation. Downsloping northeast winds off the Ossipee Mountains and warmer temperatures downwind of Lake Winnipesaukee resulted in significantly less snow near the northern end of the lake than the higher elevations. Snow totals ranged from around 1 inch in the lower elevations to as much as 10 inches south of Belknap Mountains.

Winter Storm in NORTHERN CARROLL, NEW HAMPSHIRE
From 05-DEC-20 12:00:00 to 06-DEC-20 03:00:00 (EST-5)
Reported by: Trained Spotter

Snow moved into the White Mountains early afternoon on the 5th. Snow became moderate to occasionally heavy on northern edge of the precipitation shield through the late evening. Some downsloping winds and warmer temperatures resulted in significantly less snow in the river valleys than the higher elevations. Snow totals ranged from around 4 inches in the lower elevations to as much as 15 inches in the mountains.

Winter Storm in WESTERN AND CENTRAL HILLSBOROUGH, NEW HAMPSHIRE
From 05-DEC-20 09:00:00 to 06-DEC-20 02:00:00 (EST-5)
Reported by: Trained Spotter

Snow moved into the area late morning on the 5th. Snow became moderate to occasionally heavy through the late evening just west of the strongest banded precipitation. Warmer temperatures in the Merrimack River Valley resulted in significantly less snow in central Hillsborough County than the higher elevations of the west. Snow totals ranged from around 3 inches in the lower elevations to as much as 12 inches in the Monadnocks.

Winter Storm in STRAFFORD, NEW HAMPSHIRE
From 05-DEC-20 11:00:00 to 06-DEC-20 03:00:00 (EST-5)
Reported by: Trained Spotter

Snow moved into the area early afternoon on the 5th. Snow became moderate to to heavy through the late evening under the strongest banded precipitation. Warmer temperatures in the lower elevations near Great Bay resulted in significantly less snow in southern Strafford County than the higher elevations of the north. Snow totals ranged from around 2 inches in the lower elevations to as much as 10 inches in the higher terrain.

Winter Storm in CHESHIRE, NEW HAMPSHIRE
From 05-DEC-20 09:00:00 to 06-DEC-20 01:00:00 (EST-5)
Reported by: Trained Spotter

Snow moved into the area late morning on the 5th. Snow became moderate to occasionally heavy through the late evening just west of the strongest banded precipitation. Winds downsloping off the Monadnocks and warmer temperatures in the Connecticut River Valley resulted in significantly less snow in western Cheshire County than the higher elevations to the east. Snow totals ranged from around 3 inches in the Connecticut River Valley to as much as 12 inches in the higher terrain.