Yes, I'm familiar with that phenomenon. It's called "instantaneous frost." When hot water is poured into extremely cold air, the hot water droplets quickly lose heat to the surrounding air, causing them to freeze into tiny ice crystals, which we see as snow. This can happen if the air temperature is below freezing and the humidity is low. It's most commonly observed in extremely cold temperatures, such as those experienced in the polar regions or at high altitudes.
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