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over open waters, deep convection forms, which allows polar low development to become possible. The systems usually have a horizontal length scale of less than 1000 km and exist for no more than a couple of days. They are part of the larger class of mesoscale weather systems. Polar lows can be difficult to detect using conventional weather reports and are a hazard to high-latitude operations, such as shipping and gas and oil platforms. Polar lows have been referred to by many other terms, such as

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