Deep 0°C isothermal layers within precipitation bands over southern Ontario

Isothermal layers having a temperature of 0°C and depths up to 1 km were measured within two precipitation bands occurring within autumn storms over southern Ontario. Across these layers, wind shears up to 0.02 s −1 existed, and aggregation led to particles up to ∼20 mm in diameter. Melting and evaporation are proposed as contributing to the development of the layers.