Heavy Snow — Southern Grafton, New Hampshire

2018-11-20 · Southern Grafton, New Hampshire

Event narrative

Early on the morning of the 20th a parallel mesoscale band of snow developed over central New Hampshire, just to the north of the mid level warm front. Snow persisted under this feature into the mid afternoon, where a narrow swath received 6 to 8 inches of snow. As temperatures aloft cooled in the mid-afternoon, the snow to liquid ratios became very high for the last 1 to 2 inches of snow.

Wider weather episode

Low pressure tracked along a stalled frontal boundary draped across southern New England and brought widespread snowfall to the area. Late on the 19th and early on the 20th very light rain and snow persisted along the stalled front. As low pressure approached on the morning of the 20th precipitation gradually changed to all snow and became steadier. Snow continued through the day on the 20th as temperatures hovered near freezing. Low pressure continued to strengthen in the Gulf of Maine and helped to prolong the snow into the evening.

Source: NOAA Storm Events Database, event_id 786160. Narrative written by the NWS forecast office that issued the report.