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This is a RADAR image of a severe thunderstorm in Oklahoma, just the kind of storm that is capable of producing a tornado. By checking the color key, you can see that the most severe area of this storm is indicated in red. Now, if you look at the velocity image of the same storm, it shows where and how quickly the winds are blowing. The green areas represent winds that are blowing towards the northwest. But if you look closely, you can see a green area right next to an orange area. The orange area represents winds that are blowing in the opposite direction. This indicates that a very fast, swirling wind pattern has developed in the storm and is a good sign that a tornado is forming or has formed. A tornado warning can be issued in time to save lives and property.