The fog which has caused so much travel chaos at Heathrow and other airports and the torrentiao rain which affected much of wester Scotland last week are good examples of how CONTRASTING weather systems can affect people.
Last week we has severe storms caused by a SUCCESSION of COLD, WARM and OCCLUDED FRONTS, associated with a CYCLONE (LOW pressure) bringing extremely wet, windy conditions in from the Atlantic. In cyclones, the isobars are PACKED CLOSELY; by contrsast this week we have HIGH PRESSURE (ANTICYCLONE) where the isobars are widely spaced, indicating very light winds. See the weather map (Met Office web site) for details. HUMID air cools and the water droplets condesnse to form fog. There is no wind to remove the fog, so it tends to linger, especially in low lying coastal regions or river valleys. High presure areas may remain STATIC for several days, so the fog, as well as BLACK ICE and FROST may continue.
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