When it comes to Trade Winds the winds angle is everything.
by Mike Godsey, firstname.lastname@example.org
So here are some of the many forum posts about the relative lack of trade winds in Hawaii. Read, weep and then scroll below to see what happened.
Joined: 20 Jul 2012
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Joined: 09 Jul 2000
Actually there have been pretty reliable trade winds this winter and spring. The issue is that the trade winds have often been at the wrong angle sometimes throwing parts of Maui’s north shore into a wind shadow.
You can see the problem in the video below from 6AM this morning. There are strong trade winds heading towards Maui.
The problem is that low pressure systems you see to the north and northeast are distorting the shape of the North Pacific High.
Look at the low pressure north of Hawaii and notice how the North Pacific High’s winds curve so they are SE rather than NE as they stream towards that low pressure.
Looking at the zoomed in 2nd video you can see that this is throwing parts of Maui’s north shore in the lee of the Hana side and the Big Island.
The effect is subtle today and there is wind just outside the north shore so it could still curve in this afternoon. But on days when it is a bit more SSE there has been a wind shadow all day.
The type of low pressure systems you see in the video pass MUCH less frequently and are much more to the north in the summer.
So the crappy wind you saw this winter does not mean the wind will be poor this summer. Unless of course the hints of an El Niño this coming winter arrive early.