TORRO | Severe Weather Forecast
www.torro.org.uk
TORRO is a privately-supported research body specialising in severe convective weather in Britain and Ireland

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*TORRO defines a severe thunderstorm as producing one or more of the following:

one or more tornadoes and / or waterspouts

hail with diameter of at least 20mm

non-tornadic winds gusting to 55 mph or more at surface (but which are not part of synoptic-scale straight-line winds of such velocities)*