A Doppler Radar is used to estimate two parameters, reflectivity and rotational velocity, the former provides information on the type of precipitation and its intensity, the latter on the speed and direction of the storm. This is measured through the Doppler effect, and is particularly important for measuring and detecting Hurricanes. Above is a Doppler Radar of Hurricane Andrew: a category five hurricane that hit Florida back in 1992. Up until Hurricane Katrina, Hurricane Andrew was the most expensive Hurricane, resulting in approximately 26 billion dollars in damages.
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