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| Titel |
Hail events across the Greater Metropolitan Severe Thunderstorm Warning Area |
| VerfasserIn |
A. A. Rasuly, K. K. W. Cheung, B. McBurney |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Sciences ; 15, no. 5 ; Nr. 15, no. 5 (2015-05-13), S.973-984 |
| Datensatznummer |
250119473
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| Publikation (Nr.) |
 copernicus.org/nhess-15-973-2015.pdf |
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| Zusammenfassung |
This study addresses the recent climatology of hail occurrence in the
Greater Metropolitan Severe Thunderstorm Warning Area (GMSTWA) of New South
Wales (NSW). The study area is a sprawling suburban area with a population
of nearly 4.7 million and one of Australia's largest metropoles. The main
objective is to highlight the recent temporal–spatial fluctuations of hail
event frequencies and magnitudes (sizes) for each of recognized and vastly
inhabited local government areas (LGAs). The relevant hail event data from
1989 to 2013 were initially derived from the severe storm archive of the
Australian Bureau of Meteorology. A climatologically oriented GIS technique
was then applied in the examining and mapping procedure of all hail events
and hail days reported throughout the study area. By applying a specific
criterion, severe hail (defined as 2 cm or more in diameter) was
cautiously selected for relevant analysis. The database includes 357 hail
events with sizes 2–11 cm which occurred in 169 hail days (a day in
which a hail event at least more than 2 cm reported) across the region
during the past 25 years.
The hail distribution patterns are neither temporally nor spatially uniform
in magnitude throughout the study area. Temporal analysis indicated that
most of hail events occur predominately in the afternoons with peak time of
1–5 p.m. Australian eastern standard time (EST). They are particularly common
in spring and summer, reaching maximum frequency in November and December.
There is an average of 14.3 events per year, but a significant decreasing
trend in hail frequency and associated magnitude in the recent years has
been identified. In turn, spatial analyses also established three main
distribution patterns over the study area which include the Sydney
metropolitan, the coastal and the most pronounced topographic effects. Based on the
understanding of the favorable factors for thunderstorm development in the
GMSTWA, the potential impacts from climate variability and future climate
change have been briefly discussed. |
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