- SPECIAL WEATHER STATEMENTS are the least urgent type of alert and are issued to let people know that conditions are unusual and could cause concern.
- ADVISORIES are issued for specific weather events (like blowing snow, fog, freezing drizzle and frost) that are less severe, but could still have a significant impact.
- WATCHES alert you about weather conditions that are favourable for a storm or severe weather, which could cause safety concerns.
- As certainty increases about the path and strength of a storm system, a watch may be upgraded to a WARNING, which is an urgent message that severe weather is either occurring or will occur. Warnings are usually issued six to 24 hours in advance, although some severe weather (such as thunderstorms and tornadoes) can occur rapidly, with less than a half hours’ notice.
These public alert bulletins are issued through the media, as well as through the Government of Canada's Weatheradio service and website. To learn about any current warnings, watches, and statements, weather summaries, or lightning risk, click here.
Source: https://weather.gc.ca/mainmenu/alert_menu_e.html
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