Numerical simulations of hailstorm feeder‐cloud initiation |
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| Authors: | Lawrence Cheng |
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| Institution: | Resource Technologies Department , Alberta Research Council , P.O. Box 8330, Postal Station F, Edmonton, Alberta, T6H 5X2 |
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| Abstract: | Abstract A simple, moist two‐dimensional numerical model is developed and used to study the mechanisms for the formation of hailstorm feeder clouds. By using high spatial resolution, the model is able to simulate low‐level storm outflows and reproduce the observed separation between hailstorm feeder clouds. The cold outflow emanating from the storm is induced by evaporation of precipitation. The simulations show that feeder clouds develop in response to the gravity waves generated by wind shear that is inherent in the ambient environment and/or created by the interaction between the low‐level inflow and the storm outflow. The subcloud moisture also plays an important role in the formation of a wave‐like line of feeder clouds. It contributes in the cloud development as well as in the enhancement of gravity waves. |
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