Wind power has made significant advances in efficiency and scale in recent years, but wind-turbines are still able to handle only one of many wind-speed categories.

FORBES: Magazine Article

Earlier Sanna had explained that overcast skies and no wind made for a good top speed, but the air temperature, 28 degrees Celsius (83 degrees Fahrenheit), was too warm to sustain it for an entire lap--the engine would overheat.

FORBES: One Lamborghini, One Man, 200 MPH

Change takes work and creativity, much like how a roller coaster needs to climb up that first steep hill, but the reward is the thrill of the speed and the wind in your face on the way down.

WHITEHOUSE: Champions of Change Blog

Tornados are rated on several scales for strength based either on wind speed, pressure drop, or damaged caused, but the updated Enhanced Fujita Scale is the presently accepted scale in the United States.

FORBES: Tornados and Nukes -- How Big Can They Get?

Ye saw their sails and how the boat was tipping right over till it was going to capsize but it did not, it was just picking up speed because the wind was there and it was good, so they were all sailing great and the boys all shouting, and the men too.

NPR: Excerpt: 'Kieron Smith, boy'