Why do my frying pans warp? I preheat my frying pans with a Cooper grill surface thermometer placed directly on the cooking surface. When the pan gets to 400 degrees I put the meat in to sear it. I have a glass top electric range and use good quality cookware (Vollrath Tribute). When I preheat the pans the heat control is turned to 6/10. What can I do to get a good sear on an electric range without warping my pans? I have considered preheating the pan to a lower temperature then putting in the meat and jacking up the temperature but electric stoves just don't respond that quickly. Any ideas?