The Enhanced Fujita Scale is used to assign tornadoes a rating based on estimated wind speeds and damage.
The EF Scale became operational on Feb. 1, 2007. It was revised from the original Fujita Scale, developed in 1971 by Tetsuya Fujita, to better reflect wind speed with damage observed in tornado surveys.
Deadly Severe Weather Facts & Safety Tips:
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Heavy snow, wind and severe weather may unfold late this week as a strong storm system sweeps across the central United States.
Tropical Cyclone Alfred will threaten coastal communities around the Gulf of Carpentaria with flooding downpours through early this week.
A stormy weather pattern unfolding across Europe this week will lead to showers and gusty winds sweeping into Germany on a daily basis.
Heavy rain and mountain snow will pound the northwestern United States early this week, with the most significant impacts targeting Northern California.
Southern California bore the brunt of the latest storm to blast into the western United States on Friday.
Flooding rain and locally severe thunderstorms will push eastward across the south-central United States into Monday night.
The taste of spring across the United Kingdom will peak on Monday before the threat for windstorms returns.
One of the biggest storms in years bombarded Southern California with heavy rain and gusty winds to end the week.