Significant Weather Events in Niagara

There are no significant weather events in Niagara at this time.

Weather Definitions

Note that local snow accumulations may be significant.

  • Blizzard

    When winds of 40 km/hr or greater are expected to cause widespread reductions in visibility to 400 metres or less, due to blowing snow, or blowing snow in combination with falling snow, for at least 4 hours

  • Blowing Snow

    When blowing snow, caused by winds of at least 30 km/hr, is expected to reduce visibility to 800 metres or less for at least 3 hours

  • Extreme Cold

    Issued when the temperature or wind chill is expected to reach minus 30 C (degrees Celsius) for at least two hours

  • Snow Fall

    When 15 cm or more of snow falls within 12 hours or less

  • Snow Squall

    When, down wind of large bodies of water, like the Great Lakes, snow squalls are imminent or occurring with one or more of the following conditions being produced:

    • Localized, intense snowfall producing snowfall amounts of 15 cm or more in 12 hours or less
    • Reduced visibility (less than 400 metres) caused by heavy snow with or without blowing snow for 3 hours or more
  • Flash Freeze

    When significant ice is expected to form on roads, sidewalks, or other surfaces over much of a region because of the freezing of residual water from either melted snow, or falling/fallen rain due to a rapid drop in temperature

  • Freezing Rain

    When freezing rain is expected to pose a hazard to transportation or property or when freezing rain is expected for at least 2 hours

  • Freezing Drizzle

    When a period of freezing drizzle is expected for at least 8 hours

  • Winter Storm

    When severe and potentially dangerous winter weather conditions are expected, including:

    • A major snowfall (25 cm or more within a 24 hour period)
    • A significant snowfall (snowfall warning criteria amounts) combined with other cold weather precipitation types such as: freezing rain, strong winds, blowing snow and/or extreme cold
    • Blizzard conditions may be part of an intense winter storm, in which case a blizzard warning is issued instead of a winter storm warning
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