WHITE OUT SNOW STORM SERIESFrontal squalls may form a short distance ahead of the surface cold front or behind the cold front in situations where there are other contributing factors such as dynamic lifting from a deepening low pressure system or a series of trough lines which act similar to a traditional cold frontal passage. This type of snowsquall generally lasts less than 30 minutes at any point along its path but the motion of the line can cover large distances. The strong convection that develops has enough moisture to produce whiteout conditions at places which line passes over as the wind causes intense blowing snow. Extremely cold air over still warm water in early winter can even produce thundersnow, snow showers accompanied by lightning and thunder.įrontal snowsquall moving toward Boston, Massachusetts, United StatesĪ frontal snowsquall is an intense frontal convective line (similar to a squall line), when temperature is near freezing at the surface. In order for lake-effect snow to form, the temperature difference between the water and 850 millibars (850 hPa) should be at least 23 ☏ (13 ☌), surface temperature be around the freezing mark, the lake unfrozen, the path over the lake at least 100 kilometres (62 mi) and the directional wind shear with height should be less than 30° from the surface to 850 millibars (850 hPa). The areas affected by lake-effect snow are called snowbelts and deposition rate of many inches ( centimetres) of snow per hour are common in these situations. Regions in lee of oceans, such as the Canadian Maritimes could experience such snowsqualls. The name originates from the Great Lakes area of North America, however any body of water can produce them. This will be enhanced when the moving air mass is uplifted by higher elevations. Whiteout conditions will affect narrow corridors from shores to inland areas aligned along the prevailing wind direction. This occurs southwest of extratropical cyclones, with the curved cyclonic wind flow bringing cold air across the relatively warm Great Lakes which then leads to narrow lake-effect snow bands that can produce significant localized snowfall. Long, 74, of Springfield Township, died Thurs.When arctic air moves over large expanses of warmer open waters in winter, convective clouds develop which cause heavy snow showers due to the large amount of moisture available. Long, 74, of Springfield Township (Obituary Brought to You by Heintzelman Funeral Home) Cheryl J.
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