WeatherWhys for October 19,2012

Here's the "WeatherWhys",for Friday,October 19,2012,discussing how a weather vane works, from accuweather.com,enjoy:

A weather vane points into the wind because a much larger force is imparted on the broad tail than on the smaller arrowhead. As the wind shifts, the force is applied to the tail. The vane will then align itself into the wind so no force is being applied to either side of the tail.