The vertical pressure gradient force results from molecules in the high pressure near the earth's surface trying to move upward where the pressure is lower. Air will tend to move from high pressure to low pressure. Air tends to move air from regions of high pressure to regions of low pressure. The larger the gradient, the stronger the wind. Strong winds are found in areas of tightly packed isobars.
Friction always acts opposite to air motion and, hence, reduces wind speed.
Hence, tornadoes are not influenced by the Coriolis force. Neither is the water draining in your sink. Mark throws a ball directly to Jane. But Jane rotated away from the straight-line path of the ball while the ball was in the air. However, to Mark, it looks like the ball curved to the right.