MM5 and PAFOG models were run to forecast daily regional fogs in eastern China from October to November of 2010. PAFOG model was run at each observational station with the initial and boundary conditions (IC/BC) from MM5 model. Fog was diagnosed based on the multi-variables of MM5 model output and forecasted by the visibility of PAFOG model. The results were evaluated against 3 h (or 6 h) routine observations at all stations of China Meteorology Agency (CMA) observational net works by calculating a set of scores for eastern China and Anhui Province, respectively. The evaluated results show that: (1) Both methods have a certain capability of forecasting the regional fog, with the common shortcoming of high false alarm rate. The values of TS/ETS from based on MM5 model are 0.075/0.065 for eastern China and 0.094/0.081 for Anhui Province, and the hit rate is 0.296 for eastern China and 0.378 for Anhui Province. (2)The TS/ETS values from based on PAFOG model for eastern China and Anhui Province is 0\^038/0.027 and 0.053/0.038, respectively, lower than those of MM5 model; however, the hit rates is 0\^387 for eastern China and 0.517 for Anhui, higher than those of MM5 model. (3) Based on the daily statistic, MM5 model outperforms PAFOG model in eastern China, while PAFOG model outperforms MM5 model slightly in the inland province (Anhui Province); and PAFOG model tends to over-predict fog occurrence more than MM5 model. (4) If the weather records of the past 1 h were used for model evaluations, the validation results for both methods would be improved.
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