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| Titel |
Characteristics of the 14 April 1999 Sydney hailstorm based on ground observations, weather radar, insurance data and emergency calls |
| VerfasserIn |
S. S. Schuster, R. J. Blong, R. J. Leigh, K. J. McAneney |
| 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 Science ; 5, no. 5 ; Nr. 5, no. 5 (2005-08-11), S.613-620 |
| Datensatznummer |
250002785
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| Publikation (Nr.) |
 copernicus.org/nhess-5-613-2005.pdf |
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| Zusammenfassung |
| Hailstorms occur frequently in metropolitan Sydney, in the eastern
Australian State of New South Wales, which is especially vulnerable due to
its building exposure and geographical location. Hailstorms challenge
disaster response agencies and pose a great risk for insurance companies.
This study focuses on the Sydney hailstorm of 14 April 1999 –
Australia's most expensive insured natural disaster, with supporting
information from two other storms. Comparisons are drawn between observed
hailstone sizes, radar-derived reflectivity and damage data in the form of
insurance claims and emergency calls.
The "emergency response intensity" (defined by the number of emergency
calls as a proportion of the total number of dwellings in a Census
Collection District) is a useful new measure of the storm intensity or
severity experienced. The area defined by a radar reflectivity ≥55 dBZ
appears to be a good approximation of the damage swath on ground. A
preferred area for hail damage is located to the left side of storm paths
and corresponds well with larger hailstone sizes. Merging hail cells appear
to cause a substantially higher emergency response intensity, which also
corresponds well to maximum hailstone sizes. A damage threshold could be
identified for hailstone sizes around 2.5 cm (1 cm), based on the emergency
response intensity (insurance claims). Emergency response intensity and
claims costs both correlate positively with hailstone sizes. Higher claim
costs also occurred in areas that experienced higher emergency response
intensities. |
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