Seattle.gov Home Page
Seattle Public Utilities Home page

Search Climate Change

December 2016
M T W T F S S
« Nov   Jan »
 1234
567891011
12131415161718
19202122232425
262728293031  

More Wind, Waves and Tides

Posted: December 20th, 2016

img_20161220_100631631

 

A large wind storm that landed well to our north provided strong southwesterly winds this morning. It also provided another, albeit non-King Tide, chance to monitor tides and coastal flooding.

 

Wind readings from around the Sound more or less came in at 20mph sustained with gusts to about 30mph, notably weaker than recent forecast models suggested. Peak winds arrived as air pressure was rising from 1011hPA to 1022hPA, which meant that the inverted barmoeter effect would not significantly raise water levels. Seattle’s Colman Dock tide gage recorded a peak water level of 13.38 feet (relative to mean lower-low water) at 9:48am, twenty minutes before and 1.25 feet above predicted. The greatest residual/anomaly/storm surge (1.43 feet) happened at 8:48am when pressure was still lower.

 

We’re fortunate that this event didn’t happen a few hours later; moreso a few days earlier when tides were almost a foot higher. But it served as a good opportunity to understand our sensitivity to storm surges, which as sea-levels rise will become more and more problematic. Below are some short videos from points around West Seattle at around the time of high tide.

 

 

 

 
 

 
 

Bonus: from earlier in the morning aboard the M/V Puyallup:

 

 

JRH