hurricane scale

Tools used to measure tropical storm strength
The period from August to September each year is the peak of tropical storms in the North Atlantic and North Pacific.
Why is storm No. 10 the first storm in Vietnam to be warned red?
Storm No. 10 is forecasted when landfall in our country will be strong level 12-13, level 16 jerk and it is the first storm of Vietnam to be warned of danger level 4 (red).