This is a Doppler Radar Map measuring the range and intesity of Hurrican Frances' movement through Florida in 2004. Doppler Radar uses an antena to measure the time and arrival of reflected pulses from distant objects. This measurement is called DBZ (decibels of Z). The scale of DBZ values can be seen at the side of this image and are reflected on the map with the most intense areas of this storm shown in orange and red hues.
This image was taken from:
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