Storm summary from Tuesday and Wednesday

An area of low pressure developed off the coast of Cape Hatteras on Monday and rapidly intensified as it tracked south of Nova Scotia on Tuesday. Meteorologically, the system underwent 'explosive cyclogenesis', also known as 'bombogenesis', with its minimum central pressure dropping 60 millibars in 24 hours - 2.5 times higher than the criteria of 24 millibars in 24 hours.

The lowest mean sea level pressure (MSLP) recorded on land from this system was 944.7 mb at Marticot Island as the low crossed Placentia Bay. This preliminarily sets a new record for the lowest MSLP in Newfoundland and Labrador during the month of November, surpassing the previous record of 950.7 mb set in Nain on November 7, 1987 (records since 1984). At St. John's International Airport, the lowest MSLP was measured at 950.5 mb, which shatters the previous November record of 963.1 mb set on November 30, 2019 (records since 1959).

The storm's main impacts were associated with very strong winds and coastal flooding. Large waves broke over roadways and deposited debris, high water levels caused flooding of low-lying areas and infrastructure near the coast, and numerous power and communication outages occurred island-wide.

Precipitation amounts were modest, consisting of primarily rain in the east and a mixture of rain and wet snow through central, western, and northern areas. Snowfall amounts derived using snow-on-ground sensors from automated weather stations generally ranged from 2 to 7 cm. Difficult driving conditions were reported during the late afternoon and early evening hours, particularly in central and western Newfoundland, during the heaviest snowfall.

The following is a summary of weather event information received by Environment and Climate Change Canada as of 1:00 P.M. NST.

1. Maximum wind gusts in kilometres per hour.

• Cape St. Mary's: 172 *

• Trepassey (Powles Head): 171 *

• Cape Race: 162 ^

• Cape Pine: 156 *

• Sagona Island: 155

• Musgrave Harbour: 136 *

• Calvert: 135 *

• Saint-Pierre Airport (France): 126

• Fort Point (Trinity Bay): 119 *

• Twillingate: 119

• Lamaline: 116 *

• Bonavista: 112 ^

• Burgeo: 112

• St. Lawrence: 110

• St. John's Int'l Airport: 109

• Caplin Cove: 108 *

• Pool's Island: 106

• St. John's (Robin Hood Bay): 105 *

• Blackhead (Conception Bay North): 103 *

• St. John's (East White Hills): 103 *

• Marticot Island: 102

• Grates Cove: 100

• Port aux Basques: 99

• Argentia: 97

• St. John's West: 91

• Gander Int'l Airport: 90

* denotes data from unofficial reporting stations.

^ subject to review by quality assurance.

It should also be noted that several stations stopped reporting on Tuesday evening after reporting their peak gusts, likely due to power or communication failures.

2. Rainfall in millimetres.

• Burin Bay Arm: 57.0 *

• Lamaline: 54.5 *

• Winterland (Branch Hill): 51.4

• St. Lawrence: 44.3

* denotes data from unofficial reporting stations.

Data Source: Environment and Climate Change Canada