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Windthrow Concepts

Convective cells (thunderstorms) generate strong local winds.

There are two major frontal systems that cause windthrow events.

Peak winds are generated by synoptic weather systems such as Pacific low pressure systems, and Arctic outflows, on a regional scale.

Pacific Front

Low pressure cells from Pacific spiral anti-clockwise and stretch out as they pass across coast, causing SE or NW winds; white dots are weather stations, flag shows wind direction.

Arctic Front

Arctic fronts move south over interior and out across coast range causing outflow winds in major coastal/interior valleys; white dots are weather stations, flag shows wind direction.

 

Pacific front. Show Larger Image

Arctic front. Show Larger Image
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