Northern Ontario: Fall Weather Hazards Outlook for Wednesday, October 20, 2021

/

Forecast Discussion

Colder air is expected to flow into the extreme northern part of Northern Ontario around Hudson Bay during the early part of Wednesday with temperatures remaining near the freezing mark throughout the day. Combined with a weak low-pressure over Hudson Bay will provide the potential for some flurries and wet snow beginning Wednesday morning and continuing through the day. Limited accumulation if anything at all is expected with at most around 5cm of accumulation for locations such as Fort Severn and Winisk. This may linger into early Thursday and reach even further south into Northeastern Ontario, but this will be covered in Thursday’s outlook.

Northern Ontario: Fall Weather Hazards Outlook for Monday, October 18, 2021

/

Forecast Discussion

UPDATE (Sun Night): Temperatures in the latest data are milder making the potential for flurries lower although it still can’t be ruled out. It will likely be very wet and melt on contact. We are holding with our initial map, but keep in mind that it likely won’t be as widespread.

Scattered showers will affect parts of Northeastern Ontario and up into Far Northern Ontario along Hudson Bay late Sunday with temperatures expected to drop to near the freezing mark early Monday morning. These colder temperatures could allow for the precipitation to transition over to some wet flurries particularly along the Quebec border. The risk for flurries will continue throughout the morning but should come to an end by the noon hour as the moisture moves out of the region. Very little accumulation is expected due to the warm group and earlier rainfall. At most, we can expect one or two wet slushy centimetres that will quickly melt later in the day.

Northern Ontario: Fall Weather Hazards Outlook for Monday, October 18, 2021

/

Forecast Discussion

Scattered showers will affect parts of Northeastern Ontario and up into Far Northern Ontario along Hudson Bay late Sunday with temperatures expected to drop to near the freezing mark early Monday morning. These colder temperatures could allow for the precipitation to transition over to some wet flurries particularly along the Quebec border. The risk for flurries will continue throughout the morning but should come to an end by the noon hour as the moisture moves out of the region. Very little accumulation is expected due to the warm group and earlier rainfall. At most, we can expect one or two wet slushy centimetres that will quickly melt later in the day.

Southern Ontario: Heavy Rainfall To Start Off the Weekend With Up to 20-40mm of Rain Possible by Saturday

/

Forecast Discussion

A low-pressure system is expected to move into Southern Ontario bringing with it some scattered non-severe thunderstorms and heavy rainfall to Southern Ontario late Friday. This will continue into the overnight hours before another round with more organized bands of rainfall moves across the more eastern section of the region during the day on Saturday. We expect the highest rainfall totals along the Lake Erie shoreline and into Eastern Ontario where between 20-40mm (locally up to 50mm) is possible. Further west, we will see lower totals through Southwestern and Central Ontario with rainfall totals ranging from 10-20mm (locally up to 25mm). The rainfall will come to an end late Saturday although we may see some more rain on Sunday.

Keep in mind that this forecast is just a rough idea of the expected rainfall totals. Due to the rainfall being connected to thunderstorm activity, some areas may overperform this forecast should the thunderstorm activity shift around. There may also be some underperformance with the forecast due to the localized nature of the storms.

Northern Ontario: Fall Weather Hazards Outlook for Thursday, October 14, 2021

/
NON-OUTLOOK-DAY1.png

Forecast Discussion

hick fog is expected to develop through parts of Northeastern Ontario overnight and into Thursday morning. It will likely reduce visibility to near-zero during the early morning hours which will create hazardous driving conditions within the affected area. Please travel with caution! The fog will burn off later in the morning after sunrise.

Southern Ontario: Fall Weather Hazards Outlook for Thursday, October 14, 2021

/

Forecast Discussion

Thick fog is expected to develop through Central, Eastern and Northeastern Ontario overnight and into Thursday morning. It will likely reduce visibility to near-zero during the early morning hours which will create hazardous driving conditions within the affected area. Please travel with caution! The fog will burn off later in the morning after sunrise.

Northern Ontario: Fall Weather Hazards Outlook for Wednesday, October 13, 2021

/

Forecast Discussion

Patches of heavy fog are expected to develop overnight and into Wednesday morning throughout Northeastern Ontario. The fog could create near-zero visibility on the roads making travel hazardous - be sure to drive carefully in the region during the early morning hours. It will dissipate after sunrise.