Cumulonimbus cloud detection with weather radar at Helsinki-Vantaa airport

Show full item record



Permalink

http://urn.fi/URN:NBN:fi:hulib-202104141887
Title: Cumulonimbus cloud detection with weather radar at Helsinki-Vantaa airport
Author: Tuomola, Laura
Contributor: University of Helsinki, Faculty of Science
Publisher: Helsingin yliopisto
Date: 2021
URI: http://urn.fi/URN:NBN:fi:hulib-202104141887
http://hdl.handle.net/10138/329036
Thesis level: master's thesis
Abstract: Cumulonimbus (Cb) clouds form a serious threat to aviation as they can produce severe weather hazards. Therefore, it is important to detect Cb clouds as well as possible. Finnish Meteorological Institute (FMI) provides aeronautical meteorological services in Finland, including METeorological Aerodrome Report (METAR). METAR describes weather at the aerodrome and its vicinity. Significant weather is reported in METARs, and therefore Cb clouds must be included in it. At Helsinki-Vantaa METARs are done manually by human observer. Sometimes Cb detection can be more difficult, for example, when it is dark, and it is also expensive to have human observers working around the clock all year round. Therefore, automation of Cb detection is a topical matter. FMI is applying an algorithm that uses weather radar observations to detect Cb clouds. This thesis studies how well the algorithm can detect Cb clouds compared to manual observations. The dataset used in this thesis contains summer months (June, July and August) from 2016 to 2020. Various verification scores can be calculated to analyse the results. In addition, daytime and night-time differences are calculated as well as different years and months are compared together. The results show that the algorithm is not adequate to replace human observers at Helsinki-Vantaa. However, the algorithm could be improved, for instance, by adding satellite observations to improve detection accuracy.
Subject: Meteorology
cumulonimbus
radar


Files in this item

Total number of downloads: Loading...

Files Size Format View
Laura_Tuomola_gradu_valmis.pdf 4.607Mb PDF View/Open

This item appears in the following Collection(s)

Show full item record