| Extensive isothermal layer, ice particles and water droplets must exist just below the freezing level and orographic lifting. |
| Environmental lapse rate less than saturated adiabatic lapse rate with dew point below 0°C and considerable surface heating. |
| Environmental lapse rate greater than saturated adiabatic lapse rate through a great vertical extent, high relative humidity and an initial lifting process. |
| Environmental lapse rate less than dry adiabatic lapse rate with freezing level below the cloud base, high relative humidity and strong surface winds. |
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