In fact, since records began there has been no occurrence of rainfall for such a prolonged period of time. Swithun's Day and the following 40 days and nights could happen. However, this does not prove that heavy rainfall for St. If the jet stream is in a northerly position then the weather is likely to be brighter and dry throughout summer. If the jet stream is located southerly then it is likely to be a more unsettled summer. The location of the jet stream shortly after the summer solstice largely determines the following summer's weather. The jet stream does play an important part in predicting how the weather would be for the next 40 days and nights from the end of June/early July. This led to a folklore myth that whatever the weather is like on 15 July will be how it is on the following 40 days and nights. The rain continued from 15 July for 40 days and nights. This was said to be a result of the saint's anger at being moved. On 15 July, more than a century later, his body was moved to an indoor shrine and so began the heavy shower. He initially requested to be buried outside where he said he might be subject 'to the feet of passers-by and to the raindrops pouring from on high.' Swithun, the Bishop of Winchester in the Anglo-Saxon era. "Red sky in the morning, shepherds warning" means a red sky appears due to the high-pressure weather system having already moved east meaning the good weather has passed, most likely making way for a wet and windy low-pressure system. This scatters blue light leaving only red light to give the sky its notable appearance.Ī red sky at sunset means high pressure is moving in from the west, so therefore the next day will usually be dry and pleasant. "Red sky at night, shepherds delight" can often be proven true, since red sky at night means fair weather is generally headed towards you.Ī red sky appears when dust and small particles are trapped in the atmosphere by high pressure. The saying is most reliable when weather systems predominantly come from the west as they do in the UK. Why does a red sky appear at sunrise and sunset? Red sky in morning, sailors warning", the scientific understanding behind such occurrences remains the same. It is an old weather saying often used at sunrise and sunset to signify the changing sky and was originally known to help the shepherds prepare for the next day's weather.ĭespite there being global variations in this saying such as "Red sky at night, sailors delight. Red sky in the morning, shepherd's warning" first appears in the Bible in the book of Matthew. The concept of "Red sky at night, shepherd's delight. The sayings became particularly important in sailing and agriculture, as they looked for reliable forecasts ahead of time.įrom this, developed the old weather sayings and phrases we see and hear today. In this article we look at some of these sayings and whether there is any science to back them up.ĭating back thousands of years, weather forecasting had to rely less on scientific data and more on human experience.
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