I guess since they are now lowering the bar, we are going to now have a lot more F5 tornados. And the Dims can blame it on global warming and/or Bush.
Bank on it.
Fast wind doesn't necessarily equate overall power. A tight, 1/8th of a mile-wide tornado with wind speeds of 280 MPH will not do the damage of a 3/4 of a mile-wide at 230 MPH but under the old system the smaller tornado would have been labeled as "more powerful".
Even the "F" in the F-scale, Fujita, knew his classification was flawed and at the time he developed the system, he knew that professional estimations of wind speed, based on power, were somewhat hit-or-miss.
Think of it like this: would you rather get t-boned in an intersection by a Cooper Mini going 90 MPH, or an 18-wheeler doing 75?