Frigid, Canadian high pressure nosed into the Northeast on the 19th and settled there into the first part of the 20th. Low pressure developed in the southern Plains and lifted through the lower Mississippi and then Ohio Valley. Strong warm air advection along the warm front, pinned offshore by the strong high pressure, allowed secondary cyclogensis to occur farther up the Northeast coast as the open wave aloft approached. Heavy snow overspread New Hampshire early in the morning on the 20th. As warm air advection continued ahead of the upper level wave precipitation changed over predominantly sleet, as far north as the White Mountains, before ending as snow showers.

Heavy Snow in NORTHERN COOS, NEW HAMPSHIRE
From 20-JAN-19 04:00:00 to 20-JAN-19 17:00:00 (EST-5)
Reported by: Trained Spotter

Heavy snow moved into the North Country in the early morning hours and continued through the afternoon. Mixed precipitation stayed to the south, and snowfall totals ranged from 12 to 15 inches.

Heavy Snow in SOUTHERN COOS, NEW HAMPSHIRE
From 20-JAN-19 03:00:00 to 20-JAN-19 17:00:00 (EST-5)
Reported by: Trained Spotter

Heavy snow moved into the White Mountains in the early morning hours and continued through the afternoon. Mixed precipitation stayed to the south of the notches, and snowfall totals generally ranged from 10 to 15 inches.

Heavy Snow in STRAFFORD, NEW HAMPSHIRE
From 20-JAN-19 01:00:00 to 20-JAN-19 15:00:00 (EST-5)
Reported by: Trained Spotter

Snow broke out across southeast New Hampshire early in the morning on the 20th, with heavy snow moving into area in the early morning hours. Snow changed to significant amounts of sleet during the morning and continued for much of the day. Snowfall totals generally ranged from 6 to as much 10 inches in the higher terrain north of Farmington.

Heavy Snow in CHESHIRE, NEW HAMPSHIRE
From 20-JAN-19 00:00:00 to 20-JAN-19 14:00:00 (EST-5)
Reported by: Trained Spotter

Snow broke out across southwest New Hampshire just after midnight on the 20th, with heavy snow moving into area in the early morning hours. Snow changed to significant amounts of sleet during the morning and continued for much of the day. Snowfall totals generally ranged from 6 to 10 inches. Locally higher amounts were observed near the Connecticut River, farther removed from the mid level warm air.

Heavy Snow in WESTERN AND CENTRAL HILLSBOROUGH, NEW HAMPSHIRE
From 20-JAN-19 00:00:00 to 20-JAN-19 14:00:00 (EST-5)
Reported by: Trained Spotter

Snow broke out across southwest New Hampshire just after midnight on the 20th, with heavy snow moving into area in the early morning hours. Snow changed to significant amounts of sleet during the morning and continued for much of the day. Snowfall totals generally ranged from 5 to 8 inches.

Heavy Snow in EASTERN HILLSBOROUGH, NEW HAMPSHIRE
From 20-JAN-19 01:00:00 to 20-JAN-19 15:00:00 (EST-5)
Reported by: Trained Spotter

Snow broke out across southwest New Hampshire just after midnight on the 20th, with heavy snow moving into area in the early morning hours. Snow changed to significant amounts of sleet during the morning and continued for much of the day, keeping snow amounts lower than areas farther north and west. Snowfall totals generally ranged from 5 to 7 inches.

Heavy Snow in INTERIOR ROCKINGHAM, NEW HAMPSHIRE
From 20-JAN-19 01:00:00 to 20-JAN-19 15:00:00 (EST-5)
Reported by: Trained Spotter

Snow broke out across southeast New Hampshire just after midnight on the 20th, with heavy snow moving into area in the early morning hours. Snow changed to significant amounts of sleet during the morning and continued for much of the day, keeping snow amounts lower than areas farther north and west. Snowfall totals generally ranged from 5 to 7 inches. The highest totals were observed just inland from the coast, where ocean effect enhancement and coastal front convergence likely contributed to greater low level lift.

Heavy Snow in COASTAL ROCKINGHAM, NEW HAMPSHIRE
From 20-JAN-19 01:00:00 to 20-JAN-19 15:00:00 (EST-5)
Reported by: Trained Spotter

Snow broke out across Seacoast New Hampshire just after midnight on the 20th, with heavy snow moving into area in the early morning hours. Snow changed to significant amounts of sleet during the morning and continued for much of the day, keeping snow amounts lower than areas farther north and west. Snowfall totals generally ranged from 6 to 8 inches. The highest totals were observed just inland from the coast, where ocean effect enhancement and coastal front convergence likely contributed to greater low level lift.

Heavy Snow in BELKNAP, NEW HAMPSHIRE
From 19-JAN-19 20:00:00 to 20-JAN-19 15:00:00 (EST-5)
Reported by: Trained Spotter

A band of light to moderate snow developed over the Lakes Region of New Hampshire late in the evening of the 19th in response to warm air advection developing aloft. Then heavy snow moved into area in the early morning hours. Snow changed to significant amounts of sleet during the morning and continued for much of the day. Snowfall totals generally ranged from 6 to 10 inches.

Heavy Snow in NORTHERN GRAFTON, NEW HAMPSHIRE
From 19-JAN-19 20:00:00 to 20-JAN-19 16:00:00 (EST-5)
Reported by: Trained Spotter

A band of light to moderate snow developed over parts of the White Mountains late in the evening of the 19th in response to warm air advection developing aloft. Then heavy snow moved into area in the early morning hours and continued through the afternoon. Snow changed to sleet as far north as the notches and continued for much of the midday. Snowfall totals generally ranged from 8 to 12 inches.

Heavy Snow in NORTHERN CARROLL, NEW HAMPSHIRE
From 19-JAN-19 20:00:00 to 20-JAN-19 17:00:00 (EST-5)
Reported by: Trained Spotter

A band of light to moderate snow developed over parts of the White Mountains late in the evening of the 19th in response to warm air advection developing aloft. Then heavy snow moved into area in the early morning hours and continued through the afternoon. Snow changed to sleet as far north as the notches and continued for much of the midday. Snowfall totals generally ranged from 8 to 12 inches.

Heavy Snow in SULLIVAN, NEW HAMPSHIRE
From 19-JAN-19 20:00:00 to 20-JAN-19 14:00:00 (EST-5)
Reported by: Trained Spotter

A band of light to moderate snow developed over parts of the New Hampshire late in the evening of the 19th in response to warm air advection developing aloft. Then heavy snow moved into area in the early morning hours and continued into the afternoon. Snow changed to sleet as far west as the Connecticut River and continued for much of the midday. Snowfall totals generally ranged from 8 to 12 inches.

Heavy Snow in SOUTHERN CARROLL, NEW HAMPSHIRE
From 19-JAN-19 20:00:00 to 20-JAN-19 16:00:00 (EST-5)
Reported by: Trained Spotter

A band of light to moderate snow developed over parts of the southern White Mountains late in the evening of the 19th in response to warm air advection developing aloft. Then heavy snow moved into area in the early morning hours and continued into the afternoon. Snow changed to sleet as far north as the notches and continued for much of the midday. Snowfall totals generally ranged from 8 to 12 inches.

Heavy Snow in SOUTHERN GRAFTON, NEW HAMPSHIRE
From 19-JAN-19 20:00:00 to 20-JAN-19 14:00:00 (EST-5)
Reported by: Trained Spotter

A band of light to moderate snow developed over parts of the southern White Mountains late in the evening of the 19th in response to warm air advection developing aloft. Then heavy snow moved into area in the early morning hours and continued into the afternoon. Snow changed to sleet as far north as the notches and continued for much of the midday. Snowfall totals generally ranged from 8 to 12 inches.

Heavy Snow in MERRIMACK, NEW HAMPSHIRE
From 19-JAN-19 20:00:00 to 20-JAN-19 15:00:00 (EST-5)
Reported by: Trained Spotter

A band of light to moderate snow developed over parts of the New Hampshire late in the evening of the 19th in response to warm air advection developing aloft. Then heavy snow moved into area in the early morning hours. Snow changed to significant amounts of sleet during the morning and continued for much of the day. Snowfall totals generally ranged from 6 to 10 inches.