The doted rectangle above a storm cell indicates a potential for icing, hail, and/or lightning. This information is available at all altitudes. The rectangle may extend beyond the storm cell to indicate potential threats that cannot be seen by the basic reflectivity function of the weather radar.
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Weather. It is showing us that if the plane was headed 16 degrees North it would encounter some disturbing turbulance which at all costs pilots have to avoide. That is why we have the blue dotted line to tell the pilots that the plane will divert 14 degrees to avoide the cumulonimbus cloud.
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