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> Blue Lagoon Today?
Bruce
post May 4 2011, 11:13 AM
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I know the forecast doesn't look great, but I thought if thermals start kicking-in this afternoon, it might be rideable. If anyone tries it this afternoon please post here or session alert. I' m in Novi, so It would save me a trip if it is bad.

Thanks!
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edt
post May 4 2011, 07:42 PM
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QUOTE(Bruce @ May 4 2011, 12:13 PM) *
I know the forecast doesn't look great, but I thought if thermals start kicking-in this afternoon, it might be rideable. If anyone tries it this afternoon please post here or session alert. I' m in Novi, so It would save me a trip if it is bad.

Thanks!



here's my theory on lake st clair thermals:

unlike sandy areas like for instance tawas, thermals at metro & blue lagoon dont depend too much on the sun, thermals go off cloudy or sunny, colder or warmer weather.

so my theory is this, that if you have 2 or more days of west winds followed by a day of south wind, that wind will turn into a thermal.

If you look at the shipping lane for lake st clair it goes from the flats down to the detroit river bisecting the lake. Now the thing about this shipping lane is that it is full of very cold lake huron water.

So what the 2 days of western winds do is push the top of the water over to canada, and then the water has to go somewhere so it then folds under, and at metro this means that the water is upwelling from the bottom of the lake.

But you need a bit of time for this upwelling to set in so that the cold lake huron water can get all the way to metro.

If this does happen, then you'll have a nice thermal. But also notice that because the wind shifted from west to south, you aren't going to have another thermal, so normally when you get a thermal at metro it is only for a day.

so it takes about 2 days to "recharge" this cold water so a thermal can happen and then if the wind shifts south, boom, thermal.

I was thinking about thermals all last year, because for one they do not show up on the wind gauges (the thermal is pretty narrow, and right next to shore).

So that's my theory. Eastern winds the day before turn off thermals, south winds use up the cold water powering the thermals while western winds recharge thermals.

part of this theory is that while you can get nice north winds at the blue lagoon you never get a thermal because it's too far from the shipping lane, by the time the lake huron water gets there, it's all warmed up.
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Bruce
post May 4 2011, 09:55 PM
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Thanks Edd for your thoughts on thermals. I haven't been riding that long and I nievely thought that just a sunny day with cold water would fire them up.

I understand the dynamics that you mentioned and I will watch for them this spring.

I got lucky tonight. There was just enough wind to ride for about an hour with a big kite and big board. It settled me. I was getting twitchy. It had been a week and a half since my last sessions.

Cheers.
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kedow
post May 10 2011, 09:19 AM
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Hey,

That was a good post about the water turning over etc. The colder water theory would work well with the cause I always attributed the thermals to, being the land downwind from the beach heats up from the sun. In Metro's case, the massive parking lot heats the air , the air rises, creates a "vacuum" and sucks in the cold air off the water. The colder the air off the water, the bigger the temperature difference with warm air off the parking lot , the stronger the thermal.

I live just down the road from Belle River and we had a great thermal on Sunday night...mother's day, no, I did not ride. It was sunny all day and the fields, many of them still black soil, heated up and caused about a very steady 15-18 knot breeze around six pm til sundown. For the thermal to form, the wind must already be in the west thru north to east direction usually at anything above 5 knots. One very common thing that happens here with every good thermal is that it occurs immediately after the air tempature drops from its daytime high. Ususally this occurs about 5-6 pm. You can ususally count on the wind picking up continuously until sunset. As at Metro the wind is always "up high".

Looks like a good day to ride,

Ed
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