Precipitation Type Distribution and Microphysical Processes During the 1998 Ice Storm Simulated Under Pseudo‐Warmer Conditions

In the future, intensity, phases, and frequency of precipitation are expected to change due global warming, in particular during colder seasons when temperatures near 0°C. To investigate impacts warmer atmospheric conditions on microphysical processes that lead several types, extreme 1998 Ice Storm was simulated using Weather Research Forecasting (WRF) model, with without a pseudo-global warming. The warming approach simulates similar large-scale but conditions, which allows for assessment thermodynamic feedback from cloud microphysics. For both simulations, WRF coupled Predicted Particle Properties (P3) bulk microphysics scheme predicts liquid fraction mixed-phase particles. Results simulation show an increase ∼828 m upper 0°C level northeastward migration (∼60 km) rain-snow transition region. results also 20% decrease domain-averaged freezing rain amounts, increased maximum amount 50%. horizontal distance associated melting aloft refreezing layer surface is 105 km longer southern Quebec combined effects pseudo-warming presence Appalachian Mountains. impacted as well; ice mass riming result higher rates. This study contributes our understanding changes fine-scale storm, conditions.