Flood — Carroll, New Hampshire

2022-12-24 · near Quinn, Carroll, New Hampshire

Event narrative

The Saco River climbed 1.5 feet above flood stage, cresting at 10.5 feet at the USGS gage. Minor flooding occurred as floodwaters surrounded properties across Transvale Acres in Conway. Flood waters 1 to 2 feet deep in sections of east bank camping areas.

Wider weather episode

Beginning on December 22nd a powerful storm was developing over the Ohio River Valley. On December 23rd the center of the storm was deepening rapidly (974mb) as it lifted through the eastern Great Lakes. While the center tracked into southern Ontario, high pressure retreated into the Canadian Maritimes creating a strong pressure gradient across the region. Strong southerly winds developed as a result, with speeds in excess of 80 knots at around 2,000 feet. Several rounds of strong to damaging wind gusts occurred, which brought widespread power outages with over 120,000 customers without power.

Precipitation moved into western New Hampshire during the late evening hours of December 22, and moved across the remainder of the state by the early morning of December 23. Snow quickly changed over to rain on the night of December 22nd, with a changeover later in the mountains towards daybreak on December 23rd. The precipitation continued through the evening hours of December 23, then gradually ended from south to north that night. Overland flooding was prevalent for areas where rainfall exceeded 2 inches. The impacts varied from standing water in fields to complete road washouts. The runoff exceeded capacity for most feeder creeks and rivers.

The rapidly deepening area of low pressure over the Great Lakes region combined with very high astronomical tides to produce the fourth highest storm tide ever in Portland. In addition, storm to hurricane force east to southeasterly winds occurred along the coast with nearshore waves of 15 to 20 feet coinciding during peak storm surge. Significant to major coastal damage occurred during the morning high tide cycle across the Seacoast of New Hampshire.

View location on OpenStreetMap → (44.0036, -71.1125)

Source: NOAA Storm Events Database, event_id 1068884. Narrative written by the NWS forecast office that issued the report.