Bomb Cyclone: As the weather turns colder and winter approaches, many are preparing for the holidays. But with winter’s arrival comes a rise in adverse weather, and not everyone fully understands the terminology used to describe winter storms, especially as many people travel for Thanksgiving and Christmas.
Terms like “snowstorm” and “blizzard” are often used interchangeably, but they actually have different meanings. A snowstorm is simply heavy snowfall, sometimes accompanied by strong winds, which can reduce visibility. A blizzard, however, is much more severe, involving not just heavy snow, but also winds of at least 35 mph, combined with visibility of less than a quarter of a mile for three or more hours.
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What is a blizzard?
A blizzard, according to the NWS, is when there is snowfall and winds above 35 mph. In addition, it must last at least three hours. The wind is what makes a blizzard special; without strong winds, it wouldn’t be a blizzard at all.
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A ground blizzard occurs when visibility is completely obscured by snow.
Meanwhile in the Pacific Northwest there are blizzard warnings for the Cascades! and Northern California — gusts 45 mph around the Bay Area, 85 mph in high elevations; Shasta Dam etc 10-20” above 4500 feet, 2-3 feet highest elevations! pic.twitter.com/kAvzK1C7Pi
— Ginger Zee (@Ginger_Zee) November 19, 2024
What is a snow storm?
A snowstorm refers to a heavy fall of snow with strong winds, but it doesn’t have a precise scientific definition. Essentially, any snowfall accompanied by winds can be considered a snowstorm, regardless of how much snow is actually falling. The term is often used more generally, without specific thresholds like those for blizzards, which require particular conditions such as sustained winds of 35 mph or more, in addition to reduced visibility.
In a snowstorm, the main focus is typically on the snow accumulation and how strong the winds are, rather than other factors like temperature. Since the term lacks a strict definition, it’s used loosely to describe any significant snowfall event. This is in contrast to more specific weather terms like blizzards or snow squalls, which have defined criteria to categorize their severity.
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Taste of winter: A storm is set to deliver snow, rain, and wind to millions of people in the central and eastern US this week. https://t.co/sKQ6TD12Mi pic.twitter.com/1BbcUSAp4c
— AccuWeather (@accuweather) November 18, 2024
What is a bomb cyclone?
A bomb cyclone is a term used to describe a rapidly intensifying storm, often associated with a significant drop in air pressure. This sharp decrease in pressure leads to the storm’s quick intensification, resulting in strong winds, heavy rainfall, or even snow. The term “bomb cyclone” is commonly used to describe a type of low-pressure system that deepens quickly, typically by at least 24 millibars within 24 hours, which is considered explosive intensification.
This phenomenon often causes severe weather, including thunderstorms and heavy precipitation, as the storm strengthens and pulls in moisture from surrounding areas. While bomb cyclones can occur in both winter and fall, they are especially impactful during the colder months when snow or freezing rain can exacerbate the storm’s effects.
