Black fog weather8/31/2023 ![]() As a result, fewer smogs were reported in the UK in the following decades. The Clean Air Acts of 19 were a direct result of this, reducing emissions of black smoke. Combined, this caused poor air quality that was extremely dangerous. In December 1952 London saw what become known as ‘The Great Smog’, during which weather conditions trapped the smoke from coal fires and produced ideal conditions for the formation of a dense fog. It’s been a problem since the onset of the Industrial Revolution in the late 1700’s, which saw an increase in coal burning for industry (for example to fuel factories and steam trains). Smog can turn the sky green, yellow, red, brown, black or grey. This means that industrial areas (which are usually the areas of highest air pollution) are more likely to see thicker fogs, because there are more particles in the air for the water to cling to.įog that mixes with air pollution is often called smog (smoke fog). In industrial areas it’s often particles of air pollution that the water collects around. At the coast the water usually attaches to salt particles in the air. This is because water droplets cling to tiny particles in the air. It’s interesting to note that thicker fogs often form in industrial areas. Water droplets in fog cause poor visibility by reflecting light, which can distort shapes and make it difficult to judge distances. The MET Office refers to thick fog when visibility is below 180m and dense fog when it’s below 50m (that’s the length of the Olympic sized pool we’ve been talking about!). Except for coastal fog, which is more common when warm, moist summer air meets the cold surface of the sea. For this reason, fog is more common in autumn and winter when the ground is coldest. Fog often forms when warm, moist air is cooled by cold surfaces. Clouds form when warm, moist air meets with cooler air flows. Or, how on a cold day your breath forms a mist when you exhale, as your warm breath mixes with the cold air. ![]() For example, think about how the water vapour from a hot shower, clings to the cool glass of a mirror as condensation. Water vapour in the air cools to form water droplets. ![]() They are the result of warm, moist air being cooled. This is because fog and clouds form in the same way. How much water do you think can be collected from fog? The MET Office website states that ‘if you were to fill an Olympic sized swimming pool with fog and then somehow condense it, you would be left with around 1.25 litres of water (or just over 2 pints).’ĭo you know the difference between mist and fog? It’s visibility! The Met Office states that ‘ If you can see more than 1,000 metres it's called mist, but if it is thicker and the visibility drops below 1,000 metres it's called fog.’ Mist and fog are both formed from water droplets collecting in the air, but mist is less dense (meaning an Olympic sized pool full of mist would provide less water when condensed) this means it can be seen through easier and is less likely to stick around for a long time.įog can also be described as a cloud forming at ground level. Some places call this ‘sky fishing’ or ‘stealing from the sky’. Some parts of the world use nets designed to capture the water droplets of fog, which provides a supply of water in areas that don’t see much rain. I wouldn’t have liked to be crossing roads or surrounded by obstacles I couldn’t see.įog is made of water droplets smaller than rain drops. ![]() ![]() It was thrilling, but I was on a long, even, mostly empty beach at the time. Have you walked in a thick fog before? I’ve walked into a fog where I could only see about a foot to either side of me. Fog is dangerous when travelling because it causes poor visibility. The MET Office have issued weather warnings for fog for large parts of the UK today. ![]()
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