Where does the wind go???

> 10 years ago
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SaltySinus
SaltySinus
VIC
960 posts
VIC, 960 posts
7 Apr 2013 7:11pm
I know it sounds like a stupid question (and I'm sure it is) but if say, I look at baywx.com map, I can see there is a wind meter at the centre top of the page called Fawkner Beacon, and one more or less due north called St. Kilda Harbour.

It will frequently show Fawkner Beacon up to 10knots more than St Kilda Harbour. Somewhere between these two Beacons, the wind is 'going' somewhere.

St. Kilda Beach bagging aside, where does it go? Is it being deflected, or buffered/slowed down by the buildings?

Again, stupid question, but I just can't see where it's going!


http://www.baywx.com/
SaltySinus
SaltySinus
VIC
960 posts
VIC, 960 posts
7 Apr 2013 9:31pm
48 reads, no answers,....I'm guessing a pretty daft question!
gcdave
gcdave
534 posts
534 posts
7 Apr 2013 7:57pm
Maybe u need to ask urself where the wind comes from first
SaltySinus
SaltySinus
VIC
960 posts
VIC, 960 posts
7 Apr 2013 10:18pm
Mind,... Blown....

But I'm serious in my lack of understanding in the area.
cauncy
cauncy
WA
8407 posts
WA, 8407 posts
7 Apr 2013 8:25pm
its been in dongara for the last 2 days, then f8888ed off before i had chance to ask for you, dont worry itll be back soon and ill let you know
SaltySinus
SaltySinus
VIC
960 posts
VIC, 960 posts
7 Apr 2013 10:40pm
Thanks C.
Peterdj
Peterdj
VIC
139 posts
VIC, 139 posts
8 Apr 2013 8:50am
The wind in that area tend to be funneled in through the heads. Could just be that it runs out of steam, doubt it though. Maybe the wind station at St kilda isn't working properly.

I have about 10 sites i use for wind etc and today they are all saying the same at fawkner and St Kilda. The beacon weather meter is a few meters lower i think than the St kilda one maybe the wind is at a lower level because of temperature.

There is nothing between fawkner beacon and st kilda wind meter except water. I think st Kilda wind is on the lighthouse.

The data is all from BOM anyway pretty much i think.
SaltySinus
SaltySinus
VIC
960 posts
VIC, 960 posts
8 Apr 2013 3:32pm
Hmm... okay. Can anyone confirm it's dodgy?

WHen I've been there, it's certainly 'felt' accurate... i.e. if st. K is showing about 12knots, then I can just get my 12m kite in the air (which is consistent with the spec).

puppetonastring
puppetonastring
WA
3619 posts
WA, 3619 posts
8 Apr 2013 2:34pm
It gets very teknikologically complex Salty.
But if you can follow this...
A northerly wind blows from the north in a southerly direction so in that case the wind goes south. Other winds follow the same pattern

To be a trifle more serious.
I used to ponder on this one too. i learnt at an inland river beach only about 10 or so kms from the ocean (straight line). We would often get way less seabreeze there than what was coming in at the coast.
Had visions of a SWer pushing back a great wall of easterly moving air but that didnt make sense either.
One day I was driving to the coast from inland. The farm I was leaving from had a strong easterly blowing but Seabreeze was telling me it was 15 to 20 kts SW at Woodies. As i approached the coast there was clear dust line rising from the ground on the coast side & upwards at an angle of about 30 degs. It was then I realised that the wind doesnt come in as a wall pushing back it actually shears off and over against the opposing wind. Sure enough as soon as I reached the point near where the dust line left the ground there was the seabreeze - just as Lauries arrows had said it would be.

Mightnt solve your problem but I thought it was interesting ??
SaltySinus
SaltySinus
VIC
960 posts
VIC, 960 posts
8 Apr 2013 5:31pm
It *is* interesting, puppet, thanks.

I guess it's all about fluid modelling etc.
Gateman
Gateman
QLD
409 posts
QLD, 409 posts
8 Apr 2013 9:29pm
Illustrates what Puppet was saying:


SaltySinus
SaltySinus
VIC
960 posts
VIC, 960 posts
8 Apr 2013 11:43pm
Ah, I get you... !
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