by Chris Klohn » Sun Dec 01, 2013 7:22 am
Hi Dave,
Another thing you need to look for a Westerly to work through Juan De Fuca is an increasing pressure tendency on the SISW1 pressure/wind/time graph.
You should see the tendency begin to go negative with a switch to ESE-S wind. As the front nears that tendency should start to fall rapidly, -.10 inches per hour or more.
Next up, watch the hourly pressure and see when it bottoms and then starts to rise. Ideally, you want a pressure of 29.80 or less before the tendency starts to rise. Your a Westerly wind is 2 hours away at most once the pressure starts to go positive.
If it continues dropping, you usually have a nice S-SE setup with the typical cold front. Anything that's rapidly falling or rising at Dmith a Island is well worth watching.
In the meantime, get going to Locust and keep an eye on Whidbey.
Cheers,
Chris