Snowflakes and snow crystals can grow fairly large, but there are

The Guinness World Record folks would have us believe in a 19th century snowflake more than a foot wide, but some scientists are skeptical.

The Formation of Snow Crystals

Snowflakes and snow crystals can grow fairly large, but there are limits : NPR - Meta Jaun News

Scientists unsure if there is an upper limit to snowflake size

Snowflake Science

Guide to Snowflakes

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How Snowflakes Grow

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The snow crystal morphology diagram, showing different types of snow

Snowflakes and snow crystals can grow fairly large, but there are limits : NPR