Areas with a yellow outline indicate a chance for turbulence. The numbers are the altitude range of the advisory. Turbulence might be expected between 35,000 and 42,000 feet in the area inside the yellow dashed area. Storms are also possible in the red areas which also indicate the possibility of turbulence. There are four maps available at any one time, each valid for about six hours, according to the UTC/GMT time.
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