KGW Weather Blog
June 2009
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from Coastal Susie

7:58 PM Mon, Nov 06, 2006 |

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Having lived on the coast nearly 20 years, I was wondering why this storm has such a high barometric reading? We can usually predict "big ones", but not this time! Thank you.

Cool observation and question. Reason the pressure is so high is because the center of this storm is so far away.. up near the Queen Charlotte Islands. But, wind is caused by the DIFFERENCE in pressure over an area, not the absolute value of air pressure itself. The pressure difference, or gradient, over the Coast is pretty impressive tonight, even though the values are high. You're point about usually being able to see the big one because of low pressure is vaild, because a falling, especially rapidly falling pressure, is a good indication a storm, with a strong pressure gradient around it, is approaching.

ok.. thanks for playing everyone.. it was fun. Hope you enjoyed it too!

Matt Zaffino
KGW Chief Meterologist




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