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Weather topic #7

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  Windstorms Windstorms are some of the most damaging weather scenarios we receive in the Pacific Northwest. Winds we typically receive in the Pacific Northwest are only high enough to be classified as “blustery”, but with the right conditions aloft, areas of the PNW can be hit by highly damaging wind speeds. Wind is caused by a gradient in pressure. By “gradient in pressure” I mean a change from low to high pressure over an area. The tighter the gradient, the higher the wind speeds. PNW wind is caused by a low setting up off the coastline, and then moving over the area. The favorable trajectory for high winds is when the low sets up slightly to the north, because the pressure gradient is typically denser on the south side of the low. The SE corner of the low, (where it begins to curve north), has the highest winds, and these winds are known as Bent Back Occlusion winds.  Wind can also be impacted by local terrain features. Some features can amplify the wind. One of these is t...
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Forecast August 27th

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 Wednesday, August 27th Southeasterly flow aloft continues to bring unstable weather, particularly to the Mountains… Map is showing  CAPE  values on Wednesday  North Puget Sound Highs in the upper 70s to low 80s Lows in the upper 50s to low 60s Showers Little to no wind Central Puget Sound Highs in the upper 70s to low 80s Lows in the low to mid 60s Showers, highest shower density in the morning Little to no wind South Puget Sound Highs in the upper 70s to low 80s Lows in the low to mid 60s Showers, highest shower density in the morning Slight chance of scattered lightning in the morning Gusts in the teens North Willamette Valley Highs in the upper 80s to low 90s Lows in the mid to upper 60s Scattered showers Slight chance of scattered lightning in the morning Little to no wind South Willamette Valley Highs in the upper 80s to low 90s Lows in the low to mid 60s Isolated showers Little to no wind
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