... Building Science and Technology), Prof. T.V. Lien, Dr. D.Q. Nga (Vietnam Institute of Meteorology-Hydrology), Mrs. N.T. Binh (National Meteorology-Hydrology Database Center), Ms. Hien (Namdinh meteorological ... T. V. Lien et al. Zoning for Strong Wind and Tropical cyclone prone regions over Vietnam-National research project 42A-03-05, Vietnam Institute of Meteorology & Hydrology (in Vietnamese), ... 3.3. Methods using sub-annual maxima Probably, as record length is long enough to overcome large sampling errors in analysis, and in well identified wind climate, probably Gumbel (G) method...