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Saturday, 21 March 2009

It's March and it's sunny again today - why?

Hey, what a great weekend so far. The weather is fantastic and it's still March! Notice the clear blue skies? This is high pressure, which is associated with the weather system known as an ANTICYCLONE. High pressure means that moisture can't rise. As a result, clouds don't form and so we get lovely clear skies and sunshine.
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Take a look at the weather map on the left. Can you see the centre of the high pressure over Europe indicated by the H? The pressure 1033 millibars (mb). This is high. The large gaps between the isobars (grey wavy lines) that join areas of equal pressure, mean that there is very little wind. The area of high pressure is very large and covers the whole of the UK and much of western Europe. So millions of people are enjoying this sunshine.

However, look to the left (west) of the UK. Can you see that the isobars are closer together around a capital L? This is low pressure (988mb) which is due to reach us early next week. This weather system is a DEPRESSION and is likely to bring cloud and rain. The pressure is low, so air can rise up from the Atlantic Ocean which results in clouds full of moisture forming. The isobars are close together so there will be more wind.
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Sorry to spoil the mood!

For more information about the weather, visit the Met Office website at metoffice.gov.uk

Now, back out to enjoy the sun!

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