Don't go driving pell-mell down the road at 90 mph every time the NWS issues a tornado warning. To my knowledge, no chaser has been killed by a tornado, but chasers have died in traffic accidents. Other chasers have been struck by lightning and had their lives forever changed by that experience. Any time you are around a thunderstorm when storm chasing, a certain amount of danger is present. Lightning, hail, wind, heavy rains, flooded roads, and numerous other hazards exist around these storms, any one of which can kill you.
Distance equals safety margin when storm chasing.
You don't have to be a hundred yards away from a tornado to get a good picture. The supercells can sometimes become right or left movers and begin moving toward the photographer with little or no warning. Common sense tells you that it is far better to put some distance between you and the tornado. From a photographic standpoint, you can show a lot more storm structure in the frame when you are five miles away than when you're one mile away. And the beauty of chasing in the Plains is that you can get very good shots from five to ten miles away.