A squall is a sudden, sharp increase in wind speed and usually associated with heavy rain showers. Squalls usually last only a few minutes. In the Pacific Northwest, squalls are not an unusual occurrence. It was late May, near the Washington – Oregon border and a commercial driver trainee was behind the wheel of a big rig. His trainer sat next to him in the passenger seat.  Ahead of them were black clouds, and the wind was picking up. The trainee steered the semi-truck through changing weather conditions. He didn’t slow down or adjust speed for the weather conditions. His trainer gave no instructions. Other vehicles on the highway, including a pick-up truck carrying a young couple and their two-year-old daughter, slowed down.