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Kite U.S. Forums _ Knowledge Center _ Lake St Clair Buoys LSCM4 & 45147 which one to use for D

Posted by: Turtle Oct 19 2005, 08:08 AM

I looked at the NOA site and these (2) Lake St Clair Buoys seem to be right next to each other, are they?

http://www.ndbc.noaa.gov/Maps/EastGL.shtml

The only difference I see on NOA is LSCM4 is a US Buoy and 45147 is Canadian.

http://www.ndbc.noaa.gov/station_page.php?station=lscm4
http://www.ndbc.noaa.gov/station_page.php?station=45147

If I hit the site and get a reading they are sometimes quite a bite different, just not today (see below). Yesterday they were 4-5 kts different.

Conditions at 45147 as of (8:00 am EDT) 1200 GMT on 10/19/2005:
Wind Direction (WDIR): SSW ( 210 deg true )
Wind Speed (WSPD): 17.5 kts
Wind Gust (GST): 21.4 kts

Conditions at LSCM4 as of (8:00 am EDT) 1200 GMT on 10/19/2005:
Wind Direction (WDIR): SSW ( 210 deg true )
Wind Speed (WSPD): 18 kts
Wind Gust (GST): 20 kts

Do I need to calculate the Canadian money exchange rate to get the true reading or what? laugh.gif laugh.gif

Help a brother out!

Posted by: FellowCountryMan Oct 19 2005, 08:24 AM

The Canadian bouy is a floating bouy about 5ft off the water which is not as accurate as the Light House.

Posted by: Tim Blanchard Apr 6 2006, 08:55 PM

Hi,
Canadian bouy = 2 meters off water = wind strength when water relaunching.
American bouy (LSCM4) = 20 meters off the water = wind strength kite sees at neutral and jumping.


N or W winds and frontal winds = nearly identical
S or SW thermals = LCSM4 often 5-10 knots strong and no gusts at all ie. 20kts with gusts to 21.

Checking the 2 bouys will give you an indication of whether it is "lifty" up high wind (the type we all love) or strong and turbulent (the wind the windsurfers like). Often on the lifty southerly days the canadian bouy at water level will be at 10 or 12 kts while the LSCM (USA bouy) is at 20kts or above. This is a dead give away that it is a day not to be missed if you are looking for those "elevator ride" jumping conditions that occur when it is a hot day in the spring (air temp more than ~15F greater than water temp).

Got to love those days when you can jump 20 ft on a 12m yet can't water relaunch your kite! No other place in the great lakes does this occur. St.Clair rocks smile.gif


Also remember the 2pm-3pm reading is usually when the afternoon thermal kicks in. If you see it jumps to above 12 kts (south or southwest) at that time, almost always it is kiteable at MBay and Metro from 3-7pm.

Tim

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