Extreme Weather Event (EWE)

A subset of "Hazard" and "Threat" to CI comprise extreme weather events which causes a CI disruption or, even more often, a Common cause failure of multiple CI.

EWEs comprise:

1. long duration drought
2. extreme precipitation in a short period of time (e.g., flash floods, water bombs)
3. (extreme) cold wave / cold snaps / ice & snow storms
4. (extreme) heat wave
5. extreme wind (hurricanes, tornadoes, Derecho, etc.)

Definitions

International Definitions

IPCC

Extreme Weather Event (EWE) is an event that is rare within its statistical reference distribution at a particular place

Definitions of “rare” vary but an EWE would normally be as rare or rarer than the 10^th or 90^th percentile’

See also

• Hydrometeorological Hazard
• Natural Hazard