It’s simple: Airplanes and thunderstorms don’t mix. These convective beasts can produce airframe-shattering turbulence, damaging hail, sudden and dramatic wind shear, blinding downpours, and strong, gusty winds—sometimes as much as 20 miles from the edge of a cell. The good news is that it’s not difficult to avoid these violent storms—if you know how to use the tools at your disposal.