The Columbus Day Storm October 12, 1962 Has It Happened Before? Could It Happen Again? George R. Miller.

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Presentation transcript:

The Columbus Day Storm October 12, 1962 Has It Happened Before? Could It Happen Again? George R. Miller

“Normal” Pacific Northwest Windstorms Approach coast from a WSW, W, or NW direction. Strongest pressure gradient ahead of storm. Wind generally southerly ahead of front. Once front passes, winds decrease and shift to southwesterly, westerly or northwesterly. Can occur 13 months out of the year. Can be very destructive winds.

A Typical Normal Pacific Northwest Wind Storm

Columbus Day-Type Windstorms Travel rapidly across Pacific 40 O N or lower Deep upper level trough o W Move north along coast inside 130 o W Light SE winds ahead except where gaps in Coast Range Strongest winds southerly AFTER low moves north Favor time of year: October, November and early December Often contain moisture from tropical storm Often preceded 24 hours earlier by a weaker storm

Paths of Columbus Day-Type Storms

With the low center off Northern California T = 0

When Low Center is Off NW Washington T + 12

Previous windstorms 1. January 9, 1880: Oregon’s lowest Pressure (963mb, 28.45”) at Astoria 2. October 2, 1967: 115mph Newport; 90mph Morrison Bridge 3. November 13, 1981:100+ mph coast 4. January 21, 1921: 110 kts North Head Light House 5. Lewis & Clark November 22, Columbus Day-type storm?

Observations from the Corps of Discovery: Lewis: “rained all day; wind violent from the SE” Clark: “the wind violent from the SSE.” Gass: “the wind blew very hard from the south.” Whitehouse: “A hard Storm arose in the course of last night…the wind high from the S.W.l Who’s correct? Perhaps they all are observations were listed as November 22. Who’s correct?

Wind Directions Before and After T = 0T + 12

What About the Future? 1. No doubt there will be more 2. What effect will a warmer ocean have? 3. Will there be adequate warning? 4. Will we be prepared? 5. What effect will demographics have? 6. That’s it! You’ve been blown away!

GO BEAVS!