Today we open door Three, I hope you will know more about how to predict the weather. we will see..

When it comes to weather, there is one thing for sure; we cant affect it. So what we have to do is to adept to it, and try to forecast it. The samis learn from the sounds in the mountains. They know if storm was coming up or if the next day would be  nice day. We can do the same, predict the weather if we got the knowledge. The more familiar we are with the area, the easier we have to predict. We can see the signs, and understand the wind direction etc.

What we know is that it almost always is windy in the mountains. The speed of the wind we call the wind force, and the direction the wind comes from we call wind direction. The air-pressure variation is the power that creates the wind. It always blows from areas with high air-pressure into areas with low air-pressure. Around a low-pressure, were the air streams the wind turns re-clockwise. From a high pressure,  the wind turns clockwise instead. Very often the wind in a low-pressure merges to a cyclone. This is typical in the polar front in the Swedish mountains. When they hit out mountains from vest, the wind direction comes from vest. In the low pressure central part the wind direction switches to southerly direction and the strength of the wind will be increased. Next step will be a cold front with tough windy winds between west and northwest.

Worth to know is that the earth topography has significant for the weather. When dump air streams over a mountain environment rain clouds are formed on the wind side. On the leeward side the clouds disappears. During clear night the heat radiation form earth to the atmosphere intensive. Because of that the air mass close to the ground will be cooled. The effect will be biggest on high peaks and the cooled heavy air will go down in the valley.

If it is cloudy the affect will be decreased due to that the radiation will be smaller. During the day the sun warms up the air, The air getting lighter and blow upward instead. At high altitude the air will be cooled, and will give rise to rain.

Today it is also time for a competition. So today there will be three questions, send the right answers by an SMS to: +46 702 50 90 28. For be able ti win the fine price at Christmas you need to participate on all the other three competitions. I need your answer at latest on Monday 4th of December

What is the name of the highest peak in Finland? A. Ruka, B. Lousto C. Halti.

Good luck, see ya tomorrow..