Low pressure systems or depressions are easy to spot in the United Kingdom. Remember that a low pressure system is associated with cloud, rain and winds.
Can you decide whether the image below is a low pressure system or a high pressure system?
How did you decide?
Weather Conditions Over the UK on the 7th January 1998
http://www.telegraph.co.uk |
This map shows the wind speed, cloud cover, air temperatures and fronts over the UK on the 7th January 1998. The wind speed is measured in mph and are the figures by the arrows. The arrows are the wind directions. The temperatures are in the black circles (in degrees Celsius). |
Now look at the weather chart for the 28th January 1998.
http://www.telegraph.co.uk
Both these weather systems occurred in the winter, however the maps show very different weather. What are the differences in the weather between the low pressure system from the 7th January (depression), and the high pressure system from the 28th January (anticyclone)?
Do not worry about the black lines on the maps. These are called fronts. We will cover these later if you have not already done so.
| High Pressure
(January)
http://www.telegraph.co.uk |
Low Pressure
(January)
http://www.telegraph.co.uk |
You can now look at the photograph taken on the 7th January from Moor House in the Pennines, in the North West of England. How does this photograph relate to the weather system over the UK at the time the photograph was taken?
