Spotted what looked like some cloud streets today on my lunchtime walk. These are rows of cumulus clouds that are oriented parallel to the wind direction and originate from thermal sources dotted across the countryside or ocean at regular distances, i.e. where the sun heats up a particular spot (perhaps because it's darker than the surrounds, i.e. a freshly ploughed field) until a bubble of warmer air rises up and condenses into clouds at altitude and is carried by the prevailing wind into long "streets", as per what you can see in the photo!
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