Difference between revisions of "Extreme Weather Event (EWE)"
m (Text replacement - "Common cause failure" to "Common Cause Failure") |
(→IPCC) |
||
Line 15: | Line 15: | ||
=== International Definitions === | === International Definitions === | ||
==== IPCC ==== | ==== IPCC ==== | ||
− | {{definition| | + | {{definition|An extreme weather event (EWE) is an event that is rare at a particular place and time of year. <ref>Mach, K.J., S. Planton and C. von Stechow (eds.). [https://www.ipcc.ch/pdf/assessment-report/ar5/syr/AR5_SYR_FINAL_Glossary.pdf Climate Change 2014: Synthesis Report. Contribution of Working Groups I, II and III to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change. Annex II: Glossary.] [Core Writing Team, R.K. Pachauri and L.A. Meyer (eds.)]. IPCC, Geneva, Switzerland, pp. 117-130.</ref>}} |
− | <big>Definitions of | + | <big> Definitions of rare vary, but an extreme weather event would normally be as rare as or rarer than the 10<sup>th</sup> or 90<sup>th</sup> percentile |
+ | of a probability density function estimated from observations.</big><br /> | ||
=== National Definitions === | === National Definitions === |
Revision as of 17:00, 5 September 2016
A subset of "Hazard" and "Threat" to CI comprise Extreme Weather Events (EWE) which causes a CI disruption or, even more often, a Common Cause Failure of multiple CI.
EWE comprise:
- long duration drought
- extreme precipitation in a short period of time (e.g., flash floods, water bombs)
- (extreme) cold wave / cold snaps / ice & snow storms
- (extreme) heat wave
- extreme wind (hurricanes, tornadoes, Derecho, etc.)
Contents
Definitions
International Definitions
IPCC
Definitions of rare vary, but an extreme weather event would normally be as rare as or rarer than the 10th or 90th percentile
of a probability density function estimated from observations.
National Definitions
Australia
Definitions of rare vary, but an extreme weather event would normally be as rare as or rarer than the 10th or 90th percentile of a probability density function estimated from observations.
Moreover, Australia has defined severe weather:
Severe weather is often associated with extreme convective weather (tropical cyclones, tornadoes, severe
thunderstorms, squalls, etc.) and with storms of freezing precipitation or blizzard conditions.
United States
NOAA
The U.S. National Oceanic and Atmospheric Administration (NOAA) uses a definition of extreme weather based on an event's climatologically-expected distribution. An event is called extreme if occurs, for example, only five per cent or less of the time. NOAA notes, however, that the exact choice of cut-off of the climatologically probability value used in the definition is somewhat arbitrary. A simple example of extreme weather is therefore when the temperature drops to a level which occurs less than five per cent of the time, say below -20 C. Extreme events, by definition, are rare.
Standard Definition
Discussion
See also
Notes
- ↑ Mach, K.J., S. Planton and C. von Stechow (eds.). Climate Change 2014: Synthesis Report. Contribution of Working Groups I, II and III to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change. Annex II: Glossary. [Core Writing Team, R.K. Pachauri and L.A. Meyer (eds.)]. IPCC, Geneva, Switzerland, pp. 117-130.
- ↑ Australian climate change glossary
- ↑ Australian Emergency Management Glossary, Emergency Management Australia (1998)