'In a large view like this one there will always be patches of clouds. Of course they are nicer with these deep lows that make the snail shell pattern in the clouds. And this deep low has to the west a pattern that clearly shows a lot of cold air is coming down from Greenland towards areas west of Ireland.
But: how do I see it is cold air? Well, warm air front makes a 'frontal zone': the air is pushed upwards in the atmosphere, it cools, and water vapour becomes droplets and clouds and eventually rain starts when enough humidity. This kind of behaviour is seen as the white edge around the centre of the low in the sat picture. That is the warm front. Behind it is the 'cold front'.
Cold air does not 'climb'. It is dryer also, and there will be clear sky. But along the way over the ocean, the air will acquire water vapour and this will form 'cells' in the air flow (the dots to the left of the centre of Low). These cells are clouds (cumulus), they grow and may become large (as can be seen over Ireland/Scotland). The higher they are in the atmosphere, (and they reach the troposphere), the colder the water droplets become ice particles. These clouds will often rain, and perhaps give thunder. The whiter these cells are in the sat picture, the colder they are, and most probably the higher they are. So white cells mean 'rain or snow showers in the area'.'
So now we must look again:
