4A.4
A Method for Calibrating Deterministic Forecasts of Rare Events

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Monday, 5 November 2012: 5:00 PM
Symphony I (Loews Vanderbilt Hotel)
Patrick T. Marsh, NOAA/NSSL & OU/CIMMS/SoM, Norman, OK; and J. S. Kain, V. Lakshmanan, and A. J. Clark

Convection-allowing models offer forecasters unique insight into convective hazards relative to numerical models using parameterized convection. However, methods to best characterize the uncertainty of guidance derived from convection-allowing models are still unrefined. This paper proposes a method of deriving calibrated probabilistic forecasts of rare events from deterministic forecasts by fitting a parametric kernel density function to the model's historical spatial error characteristics. This kernel density function is then applied to individual forecast fields to produce probabilistic forecasts. Probabilistic forecasts derived from a single deterministic forecast using the aforementioned method will be compared against probabilistic forecasts derived from 5-, 15-, and 25-member storm-scale ensemble.