2021年10月13日 · Seeing these huge flakes, growing as large as 1-2 inches in diameter, is a sign of snow that's right on the fringe of freezing – perhaps 33-35 degrees -- and isn't far from flipping over to rain or slush, especially if the weather pattern is warming. Large snowflakes fall as temperatures sit on the cusp of freezing in Seattle.

Snow can be classified by describing the weather event that is producing it, the shape of its ice crystals or flakes, how it collects on the ground, and thereafter how it changes form and composition. Depending on the status of the snow in the air or on the ground, a different classification applies.

Snowflakes are accumulations of many snow crystals. Most snowflakes are less than 1.3 centimeters (0.5 inches) across. Under certain conditions, usually requiring near-freezing temperatures, light winds, and unstable atmospheric conditions, much larger and irregular flakes can form, nearing 5 centimeters (2 inches) across.

2020年2月10日 · Snowflakes come in all shapes and sizes. Large ones can makes the outdoors look like a snow globe, while tiny ones can be so fine that you might have to squint to see them. The...

2015年1月14日 · Sometimes we have big, fluffy snowflakes in the air, and other times the flakes are tiny. What causes this difference in flake size and shape, and why is it important in a snowfall forecast?...

2025年1月3日 · “Snowflakes are kind of anything that falls out of the sky that is snowflakelike.” The presence of tiny particles in the air is the key to snow crystal formation, which typically occurs around...

2022年2月2日 · During a snowstorm, do you take note of the size of snowflakes? Many of us do, and we often think of a classic saying. Little snow, big snow means smaller snowflakes result in higher snowfall accumulation. Big snow, little snow, meaning bigger snowflakes result in …

2016年12月19日 · A: A snowflake begins to form when an extremely cold water droplet freezes onto a pollen or dust particle in the sky. This creates an ice crystal. As the ice crystal falls to the ground, water vapor freezes onto the primary crystal, building new crystals – the six arms of the snowflake. That’s the short answer.

2019年2月14日 · Suddenly, flakes can begin to fly fast and heavy — and not let up for hours, days or even a week. Lake-effect snow can dump 30 centimeters (one foot) or more of snow in less than a day. But the big totals tend to be quite localized. One area may see a lot, and a town just a short distance away may see few flakes.

2020年12月23日 · Most precipitation that forms in wintertime clouds starts out as snow because the top layer of the storm is usually cold enough to create snowflakes. Precipitation continues to fall as snow...