Abstract
M.Ing.
Globally, hazardous weather phenomena such as violent storms,
oods, cyclones,
tornadoes, snow and hail contribute to signi cant annual xed property damages,
loss of movable property and loss of life. The majority of global natural disasters
are related to hydro-meteorological events. Hazardous storms are destructive and
pose a threat to life and property. Forecasting, monitoring and detecting hazardous
storms are complex and demanding tasks, that are however essential.
In this study automatic hazardous weather detection utilizing remotely sensed meteorological
data has been investigated. Image processing techniques have been
analyzed and applied to multispectral meteorological satellite image data obtained
from the Spinning Enhanced Visible and Infrared Imager (SEVIRI) instruments
on-board the Meteosat Second Generation (MSG) geostationary meteorological
satellites Meteosat-8 and Meteosat-9.
The primary focus of this study is the detection of potentially hazardous hydrometeorological
phenomena in South Africa. A methodology for detecting potentially
hazardous storms over South Africa using meteorological satellite imagery
from MSG/SEVIRI is presented. An index indicative of the hazardous potential
of a storm is de ned to aid in the identi cation of a ected geographical areas and
to quantify the destructive potential of the detected storm.
The Hazardous Potential Index (HPI) is generated through the use of image processing
techniques such as cloud masking, cloud tracking and an image-based analysis
of the constituent elements of a severe convective storm.
A retrospective review was performed with respect to 20 case studies of documented
storms which had adversely a ected areas of South Africa. A red-green-blue (RGB)
composite image analysis technique, that may be utilized in the identi cation of
severe convective storms using SEVIRI image data, was also applied to these case
studies.