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Inland Sailing Wind Conditions

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Zane81 View Drop Down
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Post Options Post Options   Quote Zane81 Quote  Post ReplyReply Direct Link To This Post Topic: Inland Sailing Wind Conditions
    Posted: 12 Aug 09 at 8:43pm

Hi Just a quick question regarding wind conditions inland, I have been sailing at Grafham Water for the past few weeks, the last weekend both days had very little wind but plenty of sunshine! It was quite difficult to sail in.

I noticed in the afternoons a few more boats were on the water than in the mornings where there was only myself and perhaps one or two others. I didn't sail in the afternoons, but my question is; are the wind conditions better in the afternoon? Is the wind generally stronger inland after lunch? Could it have something to do with the land cooling?

 

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Post Options Post Options   Quote laserboy404 Quote  Post ReplyReply Direct Link To This Post Posted: 12 Aug 09 at 8:51pm
If the day is hot and there is only a light breeze, very
often a sea breeze will develop in the afternoon because as
the land heats up it causes the air to rise and this in
turn "sucks" in the cooler air off the sea and so a
convection current is formed.

I'm not sure how this process is affected by a greater
distance from the sea, common sense says that the effect
will be reduced.

Edited by laserboy404
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Post Options Post Options   Quote Scooby_simon Quote  Post ReplyReply Direct Link To This Post Posted: 12 Aug 09 at 9:24pm

I've sailed at Grafham for 30 years! 

 

During the summer, we SOMETIMES get a wind increase at around 5-7PM on summer days.  It has happened every summer I can remmeber, but it NOT predictable, but local weather did not predict it.  Maybe something to do with wind circulations as a result of sea winds.  I read something a while back that suggested you can get these kind of effects a fair way inland in certain conditions.....

 

Grafham is however a LONG way from the sea!!!

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laserboy404 View Drop Down
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Post Options Post Options   Quote laserboy404 Quote  Post ReplyReply Direct Link To This Post Posted: 12 Aug 09 at 9:54pm
that would make sense because on the broads in norfolk if
the weather is right we get a fairly reliable sea breeze
filling in between midday and 4pm, obviously grafham is
much further inland so the breeze would be later and less
dependable.
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Post Options Post Options   Quote Rupert Quote  Post ReplyReply Direct Link To This Post Posted: 12 Aug 09 at 11:07pm
Largeish lakes can also set up air currents, with the circulation meaning a dead patch in the middle.
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Post Options Post Options   Quote JimC Quote  Post ReplyReply Direct Link To This Post Posted: 12 Aug 09 at 11:17pm
If its a warm day then the warmth of the ground will indiuce circulation in the air nearest the ground and tend to bring what wind their is near ground level. Late in the evening as the sun starts going down this effect reduces and then stops, which is why there is often a lull before sunset.
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Post Options Post Options   Quote Stefan Lloyd Quote  Post ReplyReply Direct Link To This Post Posted: 13 Aug 09 at 5:29am

Originally posted by Zane81

are the wind conditions better in the afternoon? Is the wind generally stronger inland after lunch?

On fine settled days, especially in summer, it is common for mornings to be still and a light breeze to fill in something around 10:30 or 11:00. This is because radiative cooling of the ground overnight causes a temperature inversion that prevents mixing of the air at ground level and a few 10s of metres up where the gradient breeze is stronger. As the sun heats the ground, the inversion breaks down, mixing begins and the breeze fills in. This is exactly the same reason why in the same conditions, you get a clear sky first thing in the morning but fluffy cumulus clouds start appearing from mid-morning onwards.

In terms of sea-breeze moving inland, I live around 30 miles from the south coast and a few times a year, an obvious sea breeze arrives around 18:00 in the evening. The fluffy cumulus clouds disappear and a noticeably cool breeze suddenly fills in from the south-west. I used to fly gliders from a nearby airfield and once enjoyed a late afternoon soaring in the rising curtain of air as the sea breeze arrived - a very noticeable and obvious effect. But conditions have to be perfect for the sea-breeze to get this far inland. 

 

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rogerd View Drop Down
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Post Options Post Options   Quote rogerd Quote  Post ReplyReply Direct Link To This Post Posted: 13 Aug 09 at 8:00am
Depending on how far you want to go into the subject. Try reading "wind Steategy" by Houghton & Campbell. Quite detailed but allows you to get your head round whats happening up there.
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Post Options Post Options   Quote Adam MR 1137 Quote  Post ReplyReply Direct Link To This Post Posted: 13 Aug 09 at 9:24am
We sail roughly 15 miles from the coast, and on some hot summer days we get a cool sea breeze coming in from about 15:00 onwards, which as Jim said earlier quite rapidly dies as things cool down towards sunset.

Edited by Adam MR 1137
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Post Options Post Options   Quote tack'ho Quote  Post ReplyReply Direct Link To This Post Posted: 13 Aug 09 at 5:40pm
In Ideal conditions Sea breeze fronts have been observed in
Birmingham! Not very often I might add.
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