Canada: Adverse weather forecast across parts of southern Quebec through at least April 25

Event

Heavy rainfall is forecast across parts of southern Quebec, including Montreal and Quebec City, through at least April 25. Heavy rainfall is expected in Montreal and surrounding areas during the morning of April 24 and for surrounding areas to the east and northeast, including Quebec City, throughout April 24. Showers will linger into April 25 for areas further to the northeast around Baie-Saint-Paul. The Meteorological Service of Canada has issued red (the highest level on a three-tier scale) rainfall warnings for across the affected area. Officials could update and possibly extend the coverage of weather alerts over the coming days. Rainfall totals ranging from 2.5-7 cm (1-2.8 inches) are forecast across the affected area. The heavy downpours could trigger flooding in low-lying areas, as well as flash floods and ponding on road surfaces. The flood threat could be exacerbated due to already high river levels due to spring snowmelt.

Hazardous Conditions
Sustained heavy rainfall could trigger flooding in low-lying communities near rivers, streams, and creeks. Urban flooding is also possible in developed areas with easily overwhelmed stormwater drainage systems. Sites located downstream from large reservoirs or rivers may be subject to flash flooding after relatively short periods of intense rainfall. Landslides are possible in hilly or mountainous areas, especially where heavy rainfall has saturated the soil.

Authorities could issue mandatory evacuation orders for flood-prone communities over the coming days. Disruptions to electricity and telecommunications services are possible where significant flooding or landslides impact utility networks.

Transport
Floodwaters and debris flows may render some bridges, rail networks, or roadways impassable, impacting overland travel in and around affected areas. Ponding on road surfaces could cause hazardous driving conditions on regional highways. Authorities could temporarily close some low-lying routes that become inundated by floodwaters. Flooding could block regional rail lines; freight and passenger train delays and cancellations are likely in areas that see heavy rainfall and potential track inundation.

Localized business disruptions may occur in low-lying areas; some businesses might not operate at full capacity because of flood damage to facilities, possible evacuations, and some employees' inability to reach work sites.

Advice

Monitor local media for weather updates and related advisories. Confirm all transport reservations and business appointments before travel. Make allowances for localized travel delays and potential supply chain disruptions where flooding has been forecast. Do not drive on flooded roads. Charge battery-powered devices in the case of prolonged electricity outages.

Resources

Meteorological Service of Canada