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Usually accompanied by strong, gusty surface winds, significantly reduced visibility up to 1 ⁄ 4 mile (0.40 km) or less (which may reach levels creating whiteout conditions), and possibly lightning; temperature drops behind an arctic front that are sufficient to produce flash freezes, in conjunction with a significant reduction in visibility ...
The international definition of fog is a visibility of less than 1 km (3,300 ft); mist is a visibility of between 1 km (0.62 mi) and 2 km (1.2 mi) and haze from 2 km (1.2 mi) to 5 km (3.1 mi). Fog and mist are generally assumed to be composed principally of water droplets, haze and smoke can be of smaller particle size.
Whiteout or white-out [1] is a weather condition in which visibility and contrast are severely reduced by snow, fog, or sand. The horizon disappears from view while the sky and landscape appear featureless, leaving no points of visual reference by which to navigate.
Reduced visibility less than 400 m (0.25 mi), caused by snowfall, with or without blowing snow, for 3 hours or more. Frontal – Issued when a brief period (less than one hour) of poor visibility of 400 m (0.25 mi) or less caused by heavy snow and blowing snow, accompanied by strong, gusty winds of 45 km/h (28 mph) or more, is expected or ...
A dust storm warning (SAME code: DSW) is issued by the National Weather Service in the United States when blowing dust is expected to frequently reduce visibility to 1 ⁄ 4 mile (400 m) or less, generally with winds of 25 miles per hour (40 km/h) or more.
New York City police and Office of Emergency Management vehicles parked near Times Square in New York City during a 2015 blizzard warning.. A blizzard warning (SAME code: BZW) is a hazardous weather statement issued by Weather Forecast Offices (WFO) of the National Weather Service (NWS) in the United States, which indicates heavy snowfall accompanied by sustained winds or frequent gusts of 35 ...
Blowing snow [1] is snow lifted from the surface by the wind, at eye level (1.8 m or 6 ft) or more, [2] that will reduce visibility. Blowing snow can come from falling snow or snow that already accumulated on the ground but is picked up and blown about by strong winds.
A snow squall warning (SAME code: SQW) is a bulletin issued by Environment Canada's Meteorological Service of Canada and the National Weather Service in the United States to warn population of two types of snow events reducing visibility in blowing snow: lake effect snow squalls and frontal snow squalls.