The storm that swept across the center of the United States on 26 and 27 October saw the country lashed with strong winds, rain, hail, and tornadoes. Such extratropical cyclones form over the US in the spring and autumn, when the temperature difference from north to south is large. Warm, high-pressure air rushes toward the cooler, low-pressure air in the north. Because the Earth is rotating, the air moving in circles the area of low pressure, creating the comma-shaped cyclone shown
Photograph: GOES/Nasa
The Guardian
Comments