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.

Flood in GRAFTON, NEW HAMPSHIRE
From 23-DEC-22 17:45:00 to 23-DEC-22 19:00:00 (EST-5)
Location: GILMANS CORNER
Flood cause: Heavy Rain / Snow Melt
Property damage: 40.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Nichols Hill Road Roads closed due to flooding and multiple washouts. North Dorchester Road Road closed due to flooding, water 2-3 feet over the road.

Flood in GRAFTON, NEW HAMPSHIRE
From 24-DEC-22 03:15:00 to 24-DEC-22 08:00:00 (EST-5)
Location: RIVERSIDE ARPT
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

The Pemigewasset River at Plymouth came out of banks exceeding the 13 ft flood stage set at the USGS river gage. The river cresting at 15.2 feet during the early morning hours of the 24th. Flood waters reached the road at the Irving station on route 175A in Holderness and flooded the recreational fields and parking lot by PSU.

Coastal Flood in COASTAL ROCKINGHAM, NEW HAMPSHIRE
From 23-DEC-22 09:00:00 to 23-DEC-22 14:00:00 (EST-5)
Property damage: 10.00M
Crop damage: 0.00K
Reported by: Emergency Manager

Along the Seacoast of New Hampshire, the astronomical tide was 10.3 feet MLLW at 1030 am. The storm tide reached 13.2 feet MLLW due to an accompanying 2.9 foot storm surge. Flood stage is 11.0 feet MLLW in Hampton Beach. Significant flooding occurred in Rye and Hampton where ocean waters reached the top of the seawalls as waves crashed over. Water inundated route 1A along North Beach at least 3.5 feet deep. Debris such as rocks and sand was strewn over Ocean Boulevard from strong wave action. Water was estimated to be at least five feet deep on portions of Route 1A in Hampton during the peak of the storm. Sections of Route 100 were closed as well as Route 1 on the Hampton and Hampton Falls city line as the marsh overflowed. Many water rescues were required as driver attempted to cross the flood waters or from residents trapped in their flooded homes. Cusak Avenue flooded 90 minutes prior to high tide with the city police station completely surrounded by water.  In Rye, large waves moved tons of rock onto the roads that required plowing by public works to remove.
Brown���s Seafood Restaurant in Seabrook was completely surrounded by water.  In the community of New Castle, a seawall road was damaged, along with a historic seawall at Portsmouth Harbor Lighthouse.  In Portsmouth, many roads were flooded with water nearly a foot deep at the corner of the Marcy and Water Street intersection. Mechanic Street was closed due to flooding at the intersection of Peirce Island Road. Additional flooding was reported on Walden Street, South Mill Street, Pickering Avenue, Partridge Street, Parrott Avenue, New Castle Avenue, Ceres Street and Lafayette Road.  Leary Field and Haven Park flooded as storm drains backed seawater and freshwater into these low lying areas.  Storm surge flood waters entered Sagamore Creek and flooded the Dinnerhorn Restaurant on Route 1 along with Geno���s Chowder and Sandwich Shop.
The storm caused damage to residential and commercial buildings that only impacted the structure but also electrical systems within the buildings.  Road and seawall damage was also reported across the county due to heavy erosion caused by the strong near shore waves.  Many vehicles that either drove through flooded seawater or were inundated while parked experienced electrical damage.  All these factors combined for significant monetary damages from this storm to both private and public infrastructure.

Flood in STRAFFORD, NEW HAMPSHIRE
From 23-DEC-22 13:00:00 to 23-DEC-22 15:00:00 (EST-5)
Location: STRAFFORD
Flood cause: Heavy Rain / Snow Melt
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Washout on Scruton Road near Blue Job Mountain.

High Wind in NORTHERN COOS, NEW HAMPSHIRE
From 23-DEC-22 06:00:00 to 23-DEC-22 20:00:00 (EST-5)
Magnitude: 50.00 EG
Reported by: ASOS

A significant downslope windstorm occurred in the White Mountains on the 23rd. With a temperature inversion sitting right around ridgeline, strong to damaging wind gusts were able to mix down the lee side of the higher terrain. For most of the day winds gusted between 40 and 60 mph. Numerous trees and wires were reported down in the area, and power outages approached 30 percent of customers across the county.

Flood in MERRIMACK, NEW HAMPSHIRE
From 23-DEC-22 23:00:00 to 24-DEC-22 05:00:00 (EST-5)
Location: PEMBROKE
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Flood waters from the Soucook River entered a campground upstream of Pembroke. Models estimate the river crested a foot to a foot and a half above flood stage during the overnight hours of December 24.

Flood in GRAFTON, NEW HAMPSHIRE
From 23-DEC-22 23:20:00 to 24-DEC-22 03:00:00 (EST-5)
Location: QUINCY
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

According to the USGS River Gage on the Baker River at Rumney, the river exceeded the 10 ft flood stage on the evening of the 23rd and crested at 10.6 feet. The resulting flooding impacted area campgrounds.

Flood in STRAFFORD, NEW HAMPSHIRE
From 23-DEC-22 10:00:00 to 23-DEC-22 11:00:00 (EST-5)
Location: MILTON
Flood cause: Heavy Rain / Snow Melt
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Road washout at 285 Nutes Road between McKegney Road and Cross Road caused by snowmelt and rainfall.

High Wind in STRAFFORD, NEW HAMPSHIRE
From 23-DEC-22 05:00:00 to 23-DEC-22 19:00:00 (EST-5)
Magnitude: 50.00 EG
Reported by: Utility Company

Southeast New Hampshire experienced three periods of strong to damaging winds. One in the early morning hours of the 23rd generally had wind gusts in the 40 to 50 mph range. A second during the morning to midday period featured wind gusts around 60 mph. The final round of strong wind gusts occurred with a band of thunderstorms as they moved across southern New Hampshire in the early evening. Numerous trees and wires were reported down in the area, and power outages approached 30 percent of customers across the county.

Flood in MERRIMACK, NEW HAMPSHIRE
From 23-DEC-22 15:00:00 to 25-DEC-22 00:00:00 (EST-5)
Location: NORTH CHICHESTER
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

The Suncook River climbed to 11.5 feet at the USGS river gage, 4.5 feet above flood stage, during the morning of the 24th. Closure of Route 17 significantly impacted travel in and out of the area.

Flood in GRAFTON, NEW HAMPSHIRE
From 23-DEC-22 21:00:00 to 24-DEC-22 02:00:00 (EST-5)
Location: BETHLEHEM JCT
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Excessive rainfall and snowmelt caused the Ammonoosuc River to back up water on the Black Brook on the evening of December 23. The flood waters inundated River Road. The USGS gage at Bethlehem exceeded flood stage by a little more than a foot.

Flood in MERRIMACK, NEW HAMPSHIRE
From 24-DEC-22 00:15:00 to 24-DEC-22 06:00:00 (EST-5)
Location: DAVISVILLE
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

According to the USGS River Gage at Davisville, the Warner River came out of banks and crested at 8.6 feet during the early morning hours of the 24th. The flood waters impacted Riverside Road and the recreational fields in Warner.

Flood in HILLSBOROUGH, NEW HAMPSHIRE
From 23-DEC-22 14:00:00 to 23-DEC-22 16:00:00 (EST-5)
Location: GOFFSTOWN HAWKES ARP
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Road flooding at NH RT-114 at Henniker Road.

Flood in GRAFTON, NEW HAMPSHIRE
From 23-DEC-22 16:10:00 to 23-DEC-22 17:30:00 (EST-5)
Location: LANDAFF
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Road flooding on Landaff Titus Road and Landaff Mill Brook Road.

Flood in CARROLL, NEW HAMPSHIRE
From 23-DEC-22 16:30:00 to 23-DEC-22 17:30:00 (EST-5)
Location: EATON CENTER
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Flooding reported on NH RT-153 between Brownfield Road and Potter Road.

High Wind in COASTAL ROCKINGHAM, NEW HAMPSHIRE
From 23-DEC-22 03:00:00 to 23-DEC-22 19:00:00 (EST-5)
Magnitude: 54.00 MG
Reported by: ASOS

The Seacoast experienced three periods of strong to damaging winds. One in the early morning hours of the 23rd generally had wind gusts in the 40 to 50 mph range. A second during the morning to midday period featured wind gusts of 60 to 65 mph. The final round of strong wind gusts occurred with a band of thunderstorms as they moved across southern New Hampshire in the early evening.

High Wind in NORTHERN GRAFTON, NEW HAMPSHIRE
From 23-DEC-22 07:00:00 to 23-DEC-22 20:00:00 (EST-5)
Magnitude: 50.00 EG
Reported by: Mesonet

A significant downslope windstorm occurred in the White Mountains on the 23rd. With a temperature inversion sitting right around ridgeline, strong to damaging wind gusts were able to mix down the lee side of the higher terrain. For most of the day winds gusted between 40 and 60 mph. Numerous trees and wires were reported down in the area, and power outages approached 30 percent of customers across the county.

Flood in HILLSBOROUGH, NEW HAMPSHIRE
From 23-DEC-22 15:00:00 to 23-DEC-22 23:00:00 (EST-5)
Location: MILFORD
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

The Souhegan River rose above flood stage reaching 9.8 feet at the USGS river gage on the afternoon and evening of the 23rd. Floodwaters inundated a portion of Route 101A in Milford and spread into property of the Milford water utilities department and Granite Town Plaza. Floodwaters encroached on low lying properties in Wilton including some on Intervale Road and Monadnock Water.

Flood in GRAFTON, NEW HAMPSHIRE
From 23-DEC-22 21:30:00 to 24-DEC-22 00:00:00 (EST-5)
Location: NORTH WOODSTOCK
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

The Pemigewasset River climbed a foot above flood stage at the USGS river gage in Woodstock. Route 175 flooded at Cox Farm Road in Woodstock. Campgrounds along the river also flooded, but were not damaged due to it being the off-season.

Flood in HILLSBOROUGH, NEW HAMPSHIRE
From 23-DEC-22 09:30:00 to 23-DEC-22 11:00:00 (EST-5)
Location: BROWNS CORNER
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Road flooding at Bedford New Boston and Ester Dr.

Flood in STRAFFORD, NEW HAMPSHIRE
From 23-DEC-22 09:45:00 to 23-DEC-22 11:46:00 (EST-5)
Location: FARMINGTON
Flood cause: Heavy Rain / Snow Melt
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Multiple road washouts from heavy rain and snowmelt in Farmington on the morning of December 23. The reported washouts were at Reservoir Road after Mederboro Road,  Russell Lane after Ten Rod Road, at 79 Hawthorn Hill Road, Poor Farm Road between Meaderboro Road and Ten Rod Road.  There was additional flooding at Hornetown Road and Willow Lane and NH 153 between Webster Street and Mt. Vernon Road.

Flood in CARROLL, NEW HAMPSHIRE
From 23-DEC-22 10:00:00 to 23-DEC-22 11:30:00 (EST-5)
Location: SANBORNVILLE
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Road flooding on NH 109 Between Governors Road and Brice Drive.

Flood in HILLSBOROUGH, NEW HAMPSHIRE
From 23-DEC-22 18:00:00 to 23-DEC-22 19:00:00 (EST-5)
Location: PONEMAH
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Road flooding RT-22 between Sterns Road and Merrimack Road.

Flood in GRAFTON, NEW HAMPSHIRE
From 23-DEC-22 16:10:00 to 23-DEC-22 17:30:00 (EST-5)
Location: PLYMOUTH MUNI ARPT
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Flooding at Fairgrounds Road at mile marker 400.

Flood in CARROLL, NEW HAMPSHIRE
From 23-DEC-22 16:45:00 to 23-DEC-22 18:30:00 (EST-5)
Location: EAST MADISON
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Flooding at RT-153 at Madison and Freedom Town Line.

Thunderstorm Wind in HILLSBOROUGH, NEW HAMPSHIRE
From 23-DEC-22 17:12:00 to 23-DEC-22 17:15:00 (EST-5)
Location: (MHT)MANCHESTER MUNI
Magnitude: 62.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

A squall line embedded in the stronger synoptic wind storm mixed down damaging winds to the surface.  A 71 mph wind gust was reported at Manchester Airport when the line pushed through.

High Wind in SOUTHERN COOS, NEW HAMPSHIRE
From 23-DEC-22 06:00:00 to 23-DEC-22 20:00:00 (EST-5)
Magnitude: 55.00 MG
Reported by: ASOS

A significant downslope windstorm occurred in the White Mountains on the 23rd. With a temperature inversion sitting right around ridgeline, strong to damaging wind gusts were able to mix down the lee side of the higher terrain. For most of the day winds gusted between 40 and 60 mph, including a 63 mph wind gust at Mount Washington Regional Airport. Numerous trees and wires were reported down in the area, and power outages approached 30 percent of customers across the county.

Flood in CARROLL, NEW HAMPSHIRE
From 24-DEC-22 00:00:00 to 24-DEC-22 06:00:00 (EST-5)
Location: QUINN
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

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.

Flood in HILLSBOROUGH, NEW HAMPSHIRE
From 23-DEC-22 21:45:00 to 25-DEC-22 00:00:00 (EST-5)
Location: RIVERDALE
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

The USGS river gage on the Piscataquog River at Goffstown exceeded flood stage of 9 feet on the 23rd of December. The river crested at 9.9 feet resulting in flooding in Riverdale and areas below Glen Lake, including River Road.

Flood in BELKNAP, NEW HAMPSHIRE
From 23-DEC-22 09:45:00 to 23-DEC-22 10:45:00 (EST-5)
Location: WEST ALTON
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Road flooded NH 28 At Holmwood Dr.

Flood in HILLSBOROUGH, NEW HAMPSHIRE
From 23-DEC-22 10:30:00 to 23-DEC-22 11:30:00 (EST-5)
Location: SOUTH WEARE
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Minor road flooding on NH 149 near the Weare and Deering town line.

Flood in MERRIMACK, NEW HAMPSHIRE
From 23-DEC-22 10:00:00 to 23-DEC-22 11:30:00 (EST-5)
Location: PITTSFIELD
Flood cause: Heavy Rain / Snow Melt
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Washout on NH Route 107 between mile markers 821 and 881.

Flood in GRAFTON, NEW HAMPSHIRE
From 23-DEC-22 14:45:00 to 23-DEC-22 15:30:00 (EST-5)
Location: HEBRON
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Water over the road at 37 Braley Road. The road is dead end with a number of houses cut off from emergency access.

Flood in ROCKINGHAM, NEW HAMPSHIRE
From 23-DEC-22 23:30:00 to 24-DEC-22 00:00:00 (EST-5)
Location: DEERFIELD
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Bridge damaged by flooding  on Hammond Bridge between Route 107 and Route 43.

Thunderstorm Wind in STRAFFORD, NEW HAMPSHIRE
From 23-DEC-22 17:33:00 to 23-DEC-22 17:37:00 (EST-5)
Location: MADBURY
Magnitude: 56.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Convective wind gusts associated with a thunderstorm squall line downed a tree on a moving car in Durham New Hampshire.

Thunderstorm Wind in ROCKINGHAM, NEW HAMPSHIRE
From 23-DEC-22 17:23:00 to 23-DEC-22 17:28:00 (EST-5)
Location: BRENTWOOD
Magnitude: 52.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Department of Highways

Convective winds gusts associated with a squall line downed multiple trees that closed a road in Brentwood.

Flood in MERRIMACK, NEW HAMPSHIRE
From 24-DEC-22 02:00:00 to 24-DEC-22 03:30:00 (EST-5)
Location: WEST SALISBURY
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Flooding at RT-4 at Plains Road.

Thunderstorm Wind in STRAFFORD, NEW HAMPSHIRE
From 23-DEC-22 17:35:00 to 23-DEC-22 17:38:00 (EST-5)
Location: ROLLINSFORD
Magnitude: 56.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Convective wind gusts associated with a squall line downed a tree onto a vehicle in Dover.