Weather Hazards (Fall) Outlooks - Ontario
Last Update: Nov. 29, 2021 - 10:30 PM
Hello! :) This is the home for Instant Weather’s seasonal weather hazards outlooks. These outlooks will provide information on any inclement weather within the next 2 days during the fall season across Southern and Northern Ontario
We aim to update the outlooks nightly by 12 AM ET although they occasionally may be posted late if we want to go over more data. The Day 1 outlook may be updated in the morning or early afternoon if necessary.
Special outlooks may be issued occasionally for high-impact weather events outside the 2-day timeframe to give more advance notice when confidence is high enough.
Bookmark this page and be sure to check back daily for all the weather information you need to know for the next 48 hours and beyond.
Detailed criteria for the different types of hazards that our outlooks cover can be found at the bottom of this page.
Tip: Click on the map to view the full forecast including a written discussion and the ability to enlarge the map(s).
Southern Ontario
Tuesday, Nov. 30th, 2021
Featured
Wednesday, Dec. 1st, 2021
Featured
Special Outlook
Featured
Snow/Ice Day Forecast
Northern Ontario
Tuesday, Nov. 30th, 2021
Featured
Wednesday, Dec. 1st, 2021
Featured
Special Outlook
Featured
Outlook Criteria
| Hazard Type | Southern Ontario | Northern Ontario |
|---|---|---|
 Heavy Fog |
Fog is expected which will severely reduce visibility for 4 hours or longer. | Fog is expected which will severely reduce visibility for 4 hours or longer. |
 Frost Risk |
Frost is possible which may pose a threat to sensitive plants and agriculture. Issued until October 31st in Southern Ontario. |
Frost is possible which may pose a threat to sensitive plants and agriculture. Issued until October 15th in Northern Ontario. |
 Flash Freeze |
A rapid drop in temperature is expected which may cause a flash freeze and result in icy road conditions. Issued beginning November 1st in Southern Ontario |
A rapid drop in temperature is expected which may cause a flash freeze and result in icy road conditions. Issued beginning October 16th in Northern Ontario |
 Wind Gusts |
Wind gusts in excess of 80km/h are expected which may cause property damage or power outages. | Wind gusts in excess of 80km/h are expected which may cause property damage or power outages. |
 Heavy Rainfall |
Heavy rainfall is expected with in excess of 25mm of rainfall within a 24 hour period. | Heavy rainfall is expected with in excess of 25mm of rainfall within a 24 hour period. |
 Freezing Drizzle or Rain |
Freezing drizzle or rain is expected which could cause icy road conditions and power outages. | Freezing drizzle or rain is expected which could cause icy road conditions and power outages. |
 Mixed Precip. |
Mixed precipitation in the form of rain, snow, freezing rain or ice pellets is expected which may cause hazardous driving conditions. | Mixed precipitation in the form of rain, snow, freezing rain or ice pellets is expected which may cause hazardous driving conditions. |
 Ice Pellets |
Ice pellets are expected which may cause hazardous driving conditions. | Ice pellets are expected which may cause hazardous driving conditions. |
 Snow |
Snow is expected which may cause hazardous driving conditions. Issued when any snow is expected until November 15th. After November 15th, only snowfall accumulation in excess of 5cm will be covered. |
Snow is expected which may cause hazardous driving conditions. Issued when any snow is expected until November 1st. After November 1st, only snowfall accumulation in excess of 5cm will be covered. |
