Natural Hazard Data by Asian Development Bank;

Author:Asian Development Bank;
Language: eng
Format: epub
Publisher: Asian Development Bank Institute
Published: 2017-08-15T00:00:00+00:00

B. Weather

1. Tropical Cyclone

Measuring cyclone hazard. Tropical cyclones typically present three kinds of hazard, each of which can be modeled separately: wind, rainfall, and coastal storm surge. Storm surges are often the deadliest, although precipitation can cause inland flooding or induce landslides with severe impacts. Storm surge is usually measured as run-up distance; wind as wind speed, often the maximum speed sustained for a period of three seconds or more; and precipitation as millimeters of rainfall or depth of inundation. There are various scales of measurement of their intensity, as described in Box 5. The maximum potential storm surge for a particular location depends on various factors, including storm intensity and characteristics (speed, size, and angle of approach), and the shape and characteristics of the coast, including the slope of the shore.28

Box 5: Categorizing Tropical Cyclones

Tropical cyclones are monitored and classified by different national and international agencies around the world, depending on the region in which they occur. Most scales rely on wind speed, either maximum or sustained gust, to categorize the severity of a cyclone. Two of the most commonly used scales, the Saffir-Simpson hurricane wind scale and the Australian tropical cyclone intensity scale, are compared below.

Category

Saffir–Simpson Wind Scale

Australian Tropical Cyclone Intensity Scale

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