Beaufort scale used in Taiwan and mainland China, which are often affected by typhoons. Internationally, WMO Manual on Marine Meteorological Services (2012 edition) defined the Beaufort Scale only up to force 12 and there was no recommendation on the use of the extended scale. Wind speed on the 1946 Beaufort scale is based on the empirical relationship: Where "v" is the equivalent wind speed at 10 metres above the sea surface and "B" is Beaufort scale number. For example, "B" = 9.5 is related to 24.5 m/s which is equal to the lower limit of "10 Beaufort". Using this formula the highest
1887 Halloween tropical storm the storm was in Virginia. Cape Henry was hit with a combination of wind, rain, and blown sand on October 31 and communications between Cape Henry and Norfolk were lost. In Norfolk, the storm was the longest-lasting and most damaging since the Great Beaufort Hurricane of 1879. The storm conditions made beaches in the area so hazardous that they were watched day and night. Effects from the storm reached as far north as Provincetown, Massachusetts, where winds of were recorded. Despite causing damage along the East Coast, the storm is best known for causing a record number of maritime incidents.