The Objective and Sectorized Forecast for Frost in Shandong Province

Shandong province was divided into six forecast regions,based on the frost climate in the province representative stations were selected in each region,and the short-range forecast equation of daily minimum air and soil temperatures was established for each selected station by the use of sounding,surface observation and stepwise regression method.The forecast equation introduces HLAFS numerical forecast data instead of sounding and gives the forecast results of minimum air and soil temperature.According to the relationship between frost and air and soil temperature and the sectorized forecast indexes for frost,a determination whether it is frost or not in the forecast region was given.The operational system of the shortrange forecast for frost in Shandong province was developed.

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