Snowsquall warning

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Snowsquall warning is a bulletin issued by Environment Canada's Meteorological Service of Canada to warn population of two types of snow events reducing visibilities in blowing snow:

Lake effect snowsqualls which are generated by cold arctic air moving over unfrozen water of lake or sea. These will reduce visibilities to less than 1 km and produce large accumulations of snow on the ground along narrow corridors in lee of the waters. Duration of these events can extend for days.
Frontal snowsqualls which are associated with a fast moving intense cold front in winter. Visibilities must be reduce to less than 1/2 km, wind over 40 km/h with a wind shift. Quantities of snow is not important with this type but intensity is heavy for a short period, typically 10 to 20 minutes.