Winter Storm — Northern Grafton, New Hampshire

2023-03-04 · Northern Grafton, New Hampshire

Event narrative

Snow overspread the White Mountains shortly after midnight, early on the morning of the 4th. Snowfall quickly became moderate to heavy through the early afternoon hours, except where downsloping winds helped evaporate falling snow. As low pressure moved into the Gulf of Maine, flow become more northwesterly and snow tapered to upslope snow showers before ending in the evening. Snowfall totals ranged from 4 inches near the Connecticut River to 10 inches in the mountains.

Wider weather episode

Strong low pressure moved into the Ohio River Valley during the day on the 3rd. As it occluded, secondary low pressure began to develop near the Virginia Tidewater along the coastal warm front. The secondary low pressure became dominant early on the 4th, and slowed down as it paralleled the southern New England coastline. Snow was quick to become moderate to heavy in strong warm air advection. The snow transitioned to a band that paralleled the east to northeast storm track. Late on the 4th the low pressure system pulled east to northeast into the northwest Atlantic.

Source: NOAA Storm Events Database, event_id 1088882. Narrative written by the NWS forecast office that issued the report.