Basically starting off with two simple types of clouds,
this cloud, this is the sea, this is the typical cumulus cloud.
And this cloud has become cloud like that's called cumulus.
And then once it starts raining it becomes cumulonimbus,
when the head gets pretty dark and gray.
Typically at the end of the day, when it starts cooling down, it starts raining.
This blue dash lines is the rain,
and what happens at that moment is there's a downpour out of that cloud.
The air is coming down together with the rain.
The air can't go down because here's the sea.
So what happens, the air comes out on the sides of the cloud.
And this is going to massively influence what is happening to the overall winds you
are having at that moment.
If you're having a northeasterly trade wind
and one of those clouds comes through it can completely cancel the wind.
It can accelerate it, you might to have to change sails to deal with it.
It can have a big impact, you can you can have
a few hours with being extremely busy dealing with a cloud like that.
We've spoken about long term strategy,
medium strategy, weather routing, all that sort of stuff.
But sometimes it's a lot simpler,
sometimes it's some really short term stuff.
There's a cloud in front of you,
you have to deal with it, especially in the tropics.
Tropics, tradewinds, doldrums, clouds are a big part of your daily life.
Especially the end of the day, and the end of the night.
Clouds are building up all day with the heat, typical cumulus clouds,
cauliflower type.
Then it starts cooling down at the end of the day looking like anvil head,
like this.
And they become cumulonimbus,
nimbus for precipitation, mostly rain if you're lucky.
It can massively change the wind you're sailing in.
You've been nicely sailing along with trade winds 15 to 20 knots northeasterly,
and you start having these clouds around.
That is really short term strategy.
Overall you want to go there, but
above all you want to take benefit of the clouds.
And above all you want to avoid having any disadvantage of the clouds.
This cloud, for instance,
has just started raining, that's the blue stuff falling out of it.
Here's the sea, and with this rain coming down there's also massive downpour of air.
The air is falling down out of the clouds basically, this air can't go anywhere.
It sticks on the surface, which is the sea, so it goes to the sides.
We'll see later on what it means to an actual wind field when it happens.
The other thing is the closer the cloud is to the sea
the less space there is for it to go out of the sides.
So if the cloud is close to the sea, the air coming out of it is a lot stronger.
To put it simply, start off with two simple type of clouds,