Converted to Beaufort numbers, Fluttershy’s runs would yield these numbers:
 
1st run: 3 - Gentle breeze  
2nd run: 8 - Gale  
3rd run: 12 - Hurricane force

@LordDusk2014  
Fluttershy’s results are as follows, converted to mi/h wind speed:
 
1st Run: 9.75 mi/h (no damage)  
2nd Run: 44.85 mi/h (gale, possible damage)  
3rd Run: 97.5 mi/h (storm force, likely damage)
 
The total 800 wp needed, if converted to mi/h wind speed, would convert to a devastating 15,600 mi/h wind speed! (Imagine the destruction that could cause!)

@LeAlbinoPony  
That would be the combined equivalent of about two Category 5 hurricanes! (I think…)

Rainbow Dash’s wing power is 16.5, which, according to a translation of wing power to wind speed in mi/h, would translate to around 321.75 mi/h (514.8 km/h) wind speed!
 
Imagine how much damage that powerful of wind can do!
 
FYI: 1 wing power = approx. 19.5 mi/h (31.2 km/h) wind speed. The speeds given in mi/h (km/h in parentheses) tell the speed of atmospheric air movement from swift flight of a pegasus as it passes x point, not the actual flight speed of the pegasus.

@Revan0123  
Thanks for reminding me. I have one like that too and just uploaded it.  
>>314698

And yet Thunderlanes mane stays just as cool
 
_{also two mares hugging}

OH SHIT, TWILIGHT’S SNAPPED AGAIN!