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Asia - Pacific


Aréna de Sainte-Claire, QC

Alerts in Effect

Tropical Cyclone Information Statement

Issued at 02:31 Wednesday 05 August 2020

For Tropical Storm Isaias.

The next information statement will be issued by 8:00 a.m. EDT Wednesday.

1. Summary of basic information at 2:00 a.m. EDT.

Location: 46.5 North 72.1 West.

About 170 kilometres northeast of Montreal.

Maximum sustained winds: 74 kilometres per hour.

Present movement: north-northeast at 50 kilometres per hour.

Minimum central pressure: 1000 millibars.

2. Public weather impacts and warnings summary.

Tropical Storm Isaias moving through the Townships towards Trois-Rivieres and is completing transition to a post-tropical storm. Heavy rainfall has and is occurring over southern Quebec while gusty winds will develop over eastern parts of Quebec and westernmost New Brunswick.

a. Wind.

Southeasterly winds gusting to 50 km/h are likely over western New Brunswick and parts of Quebec including the Eastern Townships, Quebec City and areas along the St. Lawrence River. As the low moves northward through the Saguenay-Lac St-Jean area Wednesday, expect warm and humid southerly winds across the region. The Eastern Townships and Gaspe Peninsula could see gusts up to 70 km/h Wednesday afternoon.

b. Rainfall.

The St. Lawrence River valley from Montreal to Trois-Rivieres has received up to 60 mm of rain, and may possibly peak to 90 mm locally. Most of the rain fell over a short period of time (2-3 hours) therefore some minor flooding may have occurred in prone locations. Around midnight the Burlington Vermont Radar showed storm total rainfall near 90 mm north of Montreal and Canadian radars suggested up to 70 mm. The main band of rain is north of the St. Lawrence and is weakening as the system moves across the river and to points north.

c. Surge/Waves.

Nothing significant is expected. Waves of 2-3 m along the southwestern portion of New Brunswick are expected into Wednesday. The St. Lawrence Estuary will also see 2-3 metres waves heading upstream on Wednesday,

3. Marine weather impacts and warnings summary.

Marginal gale force winds can be expected initially over westernmost Maritime marine regions and parts of the St.Lawrence River between Rimouski and Quebec City. Seas of 2-3 metres are expected north of the Gaspe Peninsula. Small craft operators should take precautions.

Forecaster: Mercer


Please continue to monitor alerts issued by the Canadian Hurricane Centre and forecasts issued by Environment Canada.

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