A pulse storm is a single cell thunderstorm that is usually not very strong and, if does so, only produces severe weather for short periods of time, weaken, then produce in another short burst, hence "pulses". Severe weather is any destructive weather phenomenon. The term is usually used to refer to severe thunderstorms and related phenomena such as Tornados They will usually form in environments with small vertical wind shear and on average do not last very long. Wind shear, sometimes referred to as windshear or Wind gradient, is a difference in Wind speed and direction over a relatively Severe weather in a pulse storm will most often occur during a momentarily strong updraft and take the form of hail or particularly damaging winds from downbursts. An updraft or downdraft ( air pocket) is the vertical movement of Air as a Weather related phenomenon Downburst damagejpg|thumb|right|300px|Downburst damages in a straight line On a rare occurrence there could be a weak tornado from a pulse storm. A tornado is a violent rotating column of air which is in contact with both the surface of the earth and a Cumulonimbus cloud or in rare cases the base of a Cumulus
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