How accurate does everyone think the safety bay wind meter is? It always reads +5kts more than everywhere else?
Is it actually located near the pond or somewhere else?
A few mates and I headed up there today we were actually conveying on the matter on the drive homein the car. It was saying 30 knots I was on my 10 and if didn't fell like 30 the bar did not have grunt in the upper 1/3. Some dude was on an 11m shooting to the moon. So I would think maybe the meter is on or near that Island to the north ? Further out with no wind restrictions ?
August does the same it's up on the light house at the point.
How accurate does everyone think the safety bay wind meter is? It always reads +5kts more than everywhere else?
Is it actually located near the pond or somewhere else?
Might be up here
if so you've still got 20/25
The Safey Bay meter is known to always over read by 5+ Knots. Not sure why but there must be a technical explanation to this. Use the Garden Island meter for a more accurate reading
Christian
Hey guys, the meter is on top of my place across the road from the jetty (blue house). Since we went up a storey the readings have jumped up 5kn on a SW. I think it is due to the wind gaining velocity as it goes over the house. Have been thinking about a higher mast to get cleaner air. Or alternatively just recharacterising the meter readings. If anyone has an old windsurf mast and some excess line/wire rope drop it by.
Hey guys, the meter is on top of my place across the road from the jetty (blue house). Since we went up a storey the readings have jumped up 5kn on a SW. I think it is due to the wind gaining velocity as it goes over the house. Have been thinking about a higher mast to get cleaner air. Or alternatively just recharacterising the meter readings. If anyone has an old windsurf mast and some excess line/wire rope drop it by.
The BoM use a standard height of 10m for their observations. Perhaps you could measure how high your anemometer is from ground level so a conversion to reduce the reading to roughly a 10m height can be made before it gets into seabreeze.
A good conversion to use is:
U = Ur*(10/Zr)^(1/7),
U = wind speed at 10m, Ur = your anenomometer wind speed, Zr = your anemometer height.
more info here:
en.wikipedia.org/wiki/Wind_profile_power_law
Thanks for the link mate. I've fixed up the calibration using a bunch of data points. Looked good yesterday and today.. what do u think? Will have to see more wind directions to complete the job.
Thanks for the link mate. I've fixed up the calibration using a bunch of data points. Looked good yesterday and today.. what do u think? Will have to see more wind directions to complete the job.
No worries! I would think that in a consistent SW'ly seabreeze you should be very close to Garden Island obs...
Hey guys, the meter is on top of my place across the road from the jetty (blue house). Since we went up a storey the readings have jumped up 5kn on a SW. I think it is due to the wind gaining velocity as it goes over the house. Have been thinking about a higher mast to get cleaner air. Or alternatively just recharacterising the meter readings. If anyone has an old windsurf mast and some excess line/wire rope drop it by.
Seems like its going well lately and pretty close to Garden Island . Also... it looks like your have already applied this but... BoM wind obs are a 10 minute average (gusts are instantatneous)
What'd u think of results today? First real strong day since adjustments. Didn't get a chance to get out.
My gust is based on a 20 sec rolling average of speed and direction. Then the highest occurrence of that in the 5 minute reporting window is sent as the gust.
What'd u think of results today? First real strong day since adjustments. Didn't get a chance to get out.
My gust is based on a 20 sec rolling average of speed and direction. Then the highest occurrence of that in the 5 minute reporting window is sent as the gust.
looks like it was reading a little higher than Garden Island obs today... it may just be to local effects and turbulence over your roof.
So you use a 20sec rolling average over a 5 min period for wind gusts but what do you use for the mean wind? 10 min period?
I got out at melville beach between 3 and 5 today... strongest wind Ive managed to get there all summer felt like my 8m was reading 30 knots over some rolling average chop