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Snow Squall Warning (WSW) – There are two types of snow squalls of which alerts are issued for: Open-Water – Issued when, down wind of a large body of water, snow squalls are imminent or occurring with one or more of the following conditions: Local, intense snowfall resulting in accumulations of 15 cm (5.9 in) or more in 12 hours or less.
Environment Canada meteorologists issued the first snowfall warnings of the season along the British Columbia – Yukon border where 20 cm (7.9 in) of snow was forecast. [31] Highway 1 was closed over Rogers Pass east of Revelstoke because of a vehicle crash in the wintry conditions.
The heavy snowfall tends to muffle the sound of the thunder so that it sounds more like a low rumble than the loud, sharp bang that is heard during regular thunderstorms. [ 2 ] Thundersnow can occur during a normal snowstorm that sustains strong vertical mixing which allows for favorable conditions for lightning and thunder to occur.
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. [1]
The Storm Prediction Center (SPC) issued a rare high risk of excessive rainfall in parts of Northern California, warning of "life-threatening flooding". [13] In British Columbia, Canada, over 200,000 customers of BC Hydro were left without power. [14] Highways 4, 14, 18, and 28—all on Vancouver Island—were closed due to debris and downed ...
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A winter weather advisory (originally identified as a Traveler's Advisory until the 2002-03 climatological winter when officially renamed, and informally as such by some local television stations thereafter) is a hazardous weather statement issued by local Weather Forecast Offices (WFO) of the National Weather Service in the United States when one or more types of winter precipitation—snow ...
Generally, a Winter Storm Warning is issued if the following criteria, at minimum, are forecast: snow accumulations usually between or greater than 4 to 7 inches (10 to 18 cm), or snow accumulations of usually three inches (7.6 cm) or more with significant accumulation of ice (sleet or freezing rain).