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Echo top data is indicated by the small white numbers located near some of the radar echoes. These numbers are estimates in feet of the highest cloud tops associated with the radar echoes. Two zeroes must be added onto the end of each number to obtain a correct value. For example, in the lower left corner of the image, the value "200" associated with radar echoes just off the coast of Texas indicates that the highest cloud tops associated with these echoes to be approximately 20000 feet.
Cell movement data depicts in which direction and at what speed individual thunderstorm cells are moving. This information is indicated by a white wind barb (see example below). The white wind barb in South Carolina indicates that the individual cells embedded in the cluster of showers and thunderstorms along the East Coast are moving to the northeast at 25 MPH.
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