Answer:
Velocity of storm
Step-by-step explanation:
As we know that all vectors are defined by their magnitude and direction both. Here as we can see that the reporter told about the flow speed of air which is 20 miles per hour. Also the reporter mentioned the direction in which this air is blowing.

So here we can find the magnitude of air flow as well as we can also find the direction of air flow.
So here this represents the vector quantity which is known as velocity.
So here we will say that the storm velocity is reported by the reporter here in the given statement