On Forming Reason of Local Torrential Rain in Northern Shandong Province on July 22 2000

By analyzing the routine weather data, satellite cloud picture and Doppler radar data in the paper, the result shows that the main reason resulting in local torrential rain in Northern Shandong Province on July 22 2000 was that mesoscale convective systems ,which formed under the condition of the aloft trough preceding the surface cold front and unstable energy accumulation in the vicinity of the aloft trough , moved backwards.

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