Winter Storm — Southern Grafton, New Hampshire

2025-02-08 to 2025-02-09 · Southern Grafton, New Hampshire

Event narrative

Snow overspread the area in the late evening on the 8th. Strong warm air advection resulted in a broad area of steady snow. Most of Grafton County remained just north of the strongest banding, though the Plymouth area did see some of the heavier snowfall rates. A very deep snow growth zone also led to a prolonged period of extreme snow to liquid ratios, at times exceeding 20 to 1. Snow ended during the morning of the 9th. Snowfall totals ranged from 6 to 8 inches. Key Impacts: Heavy snow.

Wider weather episode

Low pressure formed during the day on the 8th near the confluence of the Ohio and Mississippi Rivers. The low center deepened and tracked into the Mid Atlantic, entering the northwest Atlantic south of Long Island. Snow spread along and north of the track due to strong warm air advection aloft. This arrived in southwest New Hampshire during the late evening hours, spreading north and east through midnight. While there were heavier amounts near the mid level warm front, another area of high snowfall totals occurred farther north where the snow growth zone was quite deep and snow to liquid ratios were higher than normal. Moderate to occasionally heavy snow continued into the morning of the 9th, before tapering off by midday.

Source: NOAA Storm Events Database, event_id 1226670. Narrative written by the NWS forecast office that issued the report.