Also known as: fl.
FL has various meanings in the Weather category. Discover the full forms, definitions, and usage contexts of FL in Weather.
The freezing level, or 0 °C (zero–degree) isotherm, represents the altitude in which the temperature is at 0 °C (the freezing point of water) in a free atmosphere (ie allowing reflection of the sun by snow, etc). Any given measure is valid for only a short period of time, often less than a day.
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