But why? What do I do with a forecast about wind speeds in urban areas? Let's be generous and say the forecast will be able to tell me one hour in advance about wind speed and direction on every street in my neighbourhood. Now I order a drone-delivered pizza. What does the drone do with this knowledge? It still needs to get the Pizza from A to B, ASAP.
Drones/sUAVs tend to be pretty sensitive to wind and the weather in general. Being able to know, as you put it, the wind speed and direction on every street means being able to potentially avoid significant slow downs and/or running out of battery from having to use more power to compensate for the wind.
Of course that's if you can predict the weather with good enough temporal and spatial resolution to be useful. But to me it seems potentially useful.
IFR manned flight requires enough fuel to fly to your alternate destination airport + 45 minutes.
Considering the idea of flying a drone with something valuable on it is a theft / vandalism / collision nuisance already that will probably never be used outside of a few test markets, I find it highly unlikely that "running out of power" will be a concern. Assuming hypothetically that they were allowed to operate on a larger scale than they are today which, again, is a dubious assumption to begin with, they will have similar reserve requirements that are easy to calculate based on observed wind conditions at a nearby airport.
