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What Is A Snow Squall InnisfilWeather.Com Snow Squall In the lees of larger lakes in the fall or early winter, cold air picks up moisture off the open water and becomes unstable. Snow squalls or lake effect snow squalls may make it look like it is snowing out of a blue sky. As the air moves inland, snow squalls can dump heavy snow over a small area in a few hours. As the winds shifts, snowfall moves over other areas. Lake effect snow bands can be very persistent and last as long as 48 hours. The combination of heavy snow and gusty winds can cause localized blizzard-like conditions. A frontal snow squall can occur with the passage of a cold front. It is marked by a sudden onset of strong winds with heavy snow that reduce visibilities to near zero in blowing snow. A Snow Squall Warning will be issued to the lee of the Great Lakes when 15 cm or more of snow is expected to fall within 12 hours, or the visibility is likely to be near zero for at least four hours because of falling and blowing snow. A Frontal Squall Warning may be issued when blizzard-like conditions are expected to develop in the vicinity of a cold front. |
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