Hi all.
At my place in September through to December we have flatware calm mornings and blows a NE wind in the afternoon. Now I could be wrong but I think the hotter it is the more it blows, and I find if there is a heavy morning dew I find it blows aswell. My question is, why is this. Some in depth answers will be mostly appreciated :)
If it is a seabreeze (being from WA, we get our fair share), it is caused by localised heating of the land. As the air gets hotter it becomes less dense and therefore rises.
Something must fill in the gap after the air has risen. In comes the cooler, denser, ocean air in the form of the seabreeze.
For us in Perth and the rest of WA (not going too far north), it's only good to be hot to a certain point. Once it is high 30's it is usually troughed out and there will be no seabreeze. No idea what happens on the eastern coast.
No idea about the dew?
Dawn patrol is spot on about the land heating, air rising etc etc etc....
It actually happens everywhere in the world where Ocean/sea meets land because land can heat and cool rapidly compared to deep ocean water. Just happens that some places in the world are a lot more consistent (ie: WA).
There's a lot more to it of course but as dawn patrol has said that is the basic physics of how sea breezes work.
Don't know if I'm right here but I'll take a stab at your morning frost or fog and say that the temperature range of the ambient land temperature would be more severe in coldest to hottest difference during the day amplifying the effect that dawn patrol mentioned. (That's not knowledge there but an educated guess)
You need a 3 deg difference between land temp and water temp for a seabrease !.
A heavy morning due is due to a lack clouds. less clouds = hotter land temp = higher differential land/water temp = stronger seabrease.
Well that is my uneducated guess anyway.
My observations In general for qlders is a Southwest wind with a dew in the morning equals a NE sea breeze in the arvo, though in NQ this can equate to a east or nor east breeze. The heavier the dew the stronger the Nor easter in the arv.
So if there is no dew present (generally) on a SW the wind will stay southerly, especially on a big high.
The last 2 months at my local would have anyone in a spin trying to understand the weather, the reef consistently blowing its arse off, BOM calling it, yet at the beach nothing.
I live in yeppoon central qld. And our Seabreeze is a cracker, super clean and consistent. But if you look at the forecast they never predict it. If it's in the red arrows NE your guaranteed 17-20knots, if the arrows are in the yellow NE you know it's going to be nuking. But SE on the other hand is the opposite, they recon 20knots you will be lucky to get 15 knots MAYBE.
Select to expand quoteTractorguy said...
My observations In general for qlders is a Southwest wind with a dew in the morning equals a NE sea breeze in the arvo, though in NQ this can equate to a east or nor east breeze. The heavier the dew the stronger the Nor easter in the arv.
So if there is no dew present (generally) on a SW the wind will stay southerly, especially on a big high.
The last 2 months at my local would have anyone in a spin trying to understand the weather, the reef consistently blowing its arse off, BOM calling it, yet at the beach nothing.
Where are you at tractor guy?
Select to expand quotePlummet said..
You need a 3 deg difference between land temp and water temp for a seabrease !.
A heavy morning due is due to a lack clouds. less clouds = hotter land temp = higher differential land/water temp = stronger seabrease.
Well that is my uneducated guess anyway.
Morning dew doesn't just form with a lack of clouds... Dew is a type of condensation. It happens when the surface temp of an object like grass, is colder than the dew point (the temp of the air at saturation point) of the air.
I'm pretty sure the seabreeze works when the air gets hot over the land, and the cool high pressure air on the ocean rushes to the low pressure air on the land.
It works better with heat to a stage, but then there gets a stage where its too hot (how it happens in Melbourne anyway) and there is a Northerly blowing, or any inland wind blowing, it kills the seabreeze effect. Sometimes if the northerly drops off we will then get a bit of a breeze come in. But I don't think it takes much of an opposing wind to stop the seabreeze effect.
Select to expand quoteewan kite said..Plummet said..
You need a 3 deg difference between land temp and water temp for a seabrease !.
A heavy morning due is due to a lack clouds. less clouds = hotter land temp = higher differential land/water temp = stronger seabrease.
Well that is my uneducated guess anyway.
Morning dew doesn't just form with a lack of clouds... Dew is a type of condensation. It happens when the surface temp of an object like grass, is colder than the dew point (the temp of the air at saturation point) of the air.
I'm pretty sure the seabreeze works when the air gets hot over the land, and the cool high pressure air on the ocean rushes to the low pressure air on the land.
It works better with heat to a stage, but then there gets a stage where its too hot (how it happens in Melbourne anyway) and there is a Northerly blowing, or any inland wind blowing, it kills the seabreeze effect. Sometimes if the northerly drops off we will then get a bit of a breeze come in. But I don't think it takes much of an opposing wind to stop the seabreeze effect.
yes your right.
But clouds hold the heat in so the ground doesn't cool as much thus less condensation... thus less due. But they also block the heat of the sun coming through. Cloud cover definitely kills or reduces seabrease.
I also agree local typography has a big effect. I have a 2500m mountain 15km south. For some reason seebrease works with a westerly flow. IE if its W or SW forecast you can add the seabrease to the forecast. If the wind is NW to N to se you can take the seabrease off the forecast.
