Mapping of Tornado Wind Vulnerability using Satellite Data (Study case of Humbang Hasudutan Regency, North Sumatera)

Abstract

Tornado wind often occurs in Humbang Hasudutan (Humbahas), North Sumatra. Even though the map of tornado vulnerability has constructed by The National Agency for Disaster Countermeasure (BNPB), but several regions did not yet have this map due to limited observation data. This study’s objective is to map the vulnerability of tornado in Humbahas using satellite data where the satellite data has more significant quality in area coverage and time-series data. The Composite Mapping Analysis (CMA) has been used to model the vulnerability map. There were three factors has used in this model, such as rainfall, land cover, and slope. Based on the tornado vulnerability map, there was an 802,406.24 ha area (74.63%) in Humbahas, classified as “high” risk to Tornado disaster. There was 271,945.46 ha (25.29%), which assigned as “moderate” risk. About 786.51 ha (0.07%) of the Humbahas area has a “low” risk of tornado disaster. As a result, the study area has a “moderate” to “high” risk of tornado wind disaster, then the adaption and mitigation plans need to be done in handling tornado hazard in this region.

Assessing the impact and resilience of the community in the aftermath of a small-scale tornado: A field survey-based analysis

“…One of the extreme weather patterns that can lead to calamities is a tornado [1,2]. Small-scale tornado or puting beliung is defined as a powerful wind that appears out of nowhere, has a center, and travels in a circle or spiral at a speed of 40-50 km/h until it reaches the earth's surface, and then quickly dissipates in three to five minutes [3,4].…”