Stock Photo - Extreme Tornado Tours - radar screen on the laptop of navigator Blake Knapp. Using the rainfall intensity readout from Doppler radar from the storm the storm chasers drive to intercept the area most likely to form tornadoes and to calculate the speed and vector of the thunderstorm.

Stock Photo: Extreme Tornado Tours - radar screen on the laptop of navigator Blake Knapp. Using the rainfall intensity readout from Doppler radar from the storm the storm.

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