The Weather Network – Stationary low gives prolonged precipitation, risk of flooding on the east coast

Monday, November 22, 2021 at 20.30 – Atlantic Canada is in the midst of a stormy pattern this week, with numerous systems bringing periods of extreme rainfall and howling winds that have the potential to cause flooding and damage.

Blocking in the North Atlantic allows slow-moving or even stationary systems to dump copious amounts of precipitation to the Atlantic Canada this week along with strong winds. More than 100 mm of rain is possible over the hardest hit areas up to and including Wednesday. As a result, there are widespread warnings of precipitation and wind, along with special weather reports highlighting the risk of flooding as a result and warning motorists of road conditions. More about the timing and the impacts below.


A large portion of shipping sees a huge amount of bay and subtropical moisture, while several systems are moving across the region this week. Local flooding will continue to be a problem, along with intense winds, until Tuesday.

Rain and wind warnings along with special weather forecasts cover much of the Maritimes and parts of Newfoundland.

Halifax will see its heaviest rainfall continue through the night on Monday, and then subside on Tuesday afternoon, as the core of it will be focused over Cape Breton, while also pushing into western Newfoundland during this time.


RELATED: How to prepare for this week’s rain

As a result of the multi-day event, rainfall will be extreme for the whole of Nova Scotia, with areas east of Halifax and the heart of the province expected to see 75-100 mm. Cape Breton could see 100+ mm. Halifax and areas west and north could see 50-75 mm, as well as southern New Brunswick. The coastal areas of western Newfoundland can see more than 100 mm of rain, with smaller amounts as you go further inland and north along the island.

“There is potential for localized flooding, lightning flooding and water collection on roads. Travelers should expect to encounter adverse driving conditions,” warns Environment and Climate Change Canada (ECCC).


Strong southeasterly winds will continue to strengthen on Monday night with gusts of 60-80 km / h, but areas along the Atlantic coast and over exposed areas can see gusts as high as 100 km / h. The wind starts to subside during Tuesday.

Throbbing surf and higher than normal water levels are possible Tuesday and Wednesday.


On Wednesday, a strong blocking altitude across the east will force this system to go back, essentially moving backwards from east to west, and continue to affect much of the Maritimes with sustained rainfall.

Temperatures in the Maritimes will drop drastically behind the frontier border Tuesday night to early Wednesday morning.

As a result, there is a risk that the rain will turn into a winter mix – short-lived frost rain, ice cubes or wet snow – as temperatures will remain below freezing. Smooth conditions are very possible for areas including Halifax, NS and into southern New Brunswick early Wednesday morning and last overnight.


In addition, the windy and turbulent weather will continue through the end of the week and over the weekend as the low pressure across the Atlantic, south of the region, will continue to meander and then merge with another system approaching from the west.

A strong blocking pattern across the North Atlantic is responsible for this long period of erratic weather as it prevents the system from escaping into the ocean.


Due to torrential rain and intense winds this week, planning is the best way to reduce the risk of flooding. While some injuries are inevitable, making an assessment in advance can make a huge difference.

Checking your insurance is definitely the key, and There are a few things you can do around the home to prepare yourself.

  • Seal your basement to prevent water from seeping into streams
  • To raise electrical system components as high as possible
  • Make sure your sump pumps are working properly
  • If a major storm is on the way, consider replenishing supplies such as: sandbags, plywood, plastic sheets and shovels

Getty floods rain roofs
(Getty Images)

If you can, also make sure to leave your car in a high-lying area and avoid driving in flooded areas at all costs.

For other safety tips, click here.

Be sure to check back for the latest updates on the unresolved pattern that is emerging for Atlantic Canada.


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