The invention provides a forecasting method and
system of a speed of an instantaneous extremely strong wind caused by a
tropical cyclone at a coastal region. The method comprises the following steps: historical
tropical cyclone data having a windy influence on a to-be-measured area as well as historical data of instantaneous extremely strong
wind speed per hour of the to-be-measured area within corresponding time are collected; according to the strength, the historical
tropical cyclone data are categorized to obtain data of various tropical cyclones; a forecasting range of the to-be-measured area is divided into a plurality of square
longitude-
latitude grids with areas of 1degree * 1degree, and for each kind of tropical
cyclone, a path point with a maximum instantaneous extremely strong
wind speed at the to-be-measured area is selected in the grid for the same tropical
cyclone, and distances of all path points and the to-be-measured area and orientations are calculated; a position and space
distribution diagram of the instantaneous extremely strong wind speeds caused by the various tropical cyclones at the to-be-measured area is made; and according to strength and path information of a tropical
cyclone that is going to be forecasted in future, an instantaneous extremely strong wind that is going to be caused at the to-be-measured area is forecasted and outputted by combining the instantaneous extremely strong wind position and space
distribution diagram. In addition, the invention also provides a corresponding forecasting
system.