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An Application of an Explicit Microphysics Mesoscale Model to a Regional Icing Event
PHILLIPS LAB HANSCOM AFB MA
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A hydrostatic regional prediction model is modified to Permit the existence of both liquid and ice hydrometeors within the same grid volume. The modified model includes an efficient ice-water saturation adjustment and a simple procedure to create or remove cloud water or ice. The objective was to determine whether such a model could provide deterministic forecasts of aircraft icing conditions in the 6-36-h period. The model was used to simulate an orographically forced icing event the Valentines Day storm of 12-14 February 1990 that occurred during the 1990 phase of the Winter Icing and Storms Project WISP-90. Output from a 24-h nested-grid integration of the model was compared to observations taken during WISP-90. The model produced a thin approx. 1-2 km deep supercooled liquid water SLW cloud that was in good agreement with observations in terms of initiation. duration, liquid water content, and location. Results of the simulation also suggest that slantwise ascent can be an important component in the production of SLW. Aircraft icing, Microphysics, Numerical weather prediction, WINTER ICING and STORMS Project, Supercooled liquid water.
APPROVED FOR PUBLIC RELEASE