Houston has only seen one F4 tornado since tornadoes have been categorized on the Fujita and newer Fujita scale used after 2007.
The Fujita scale is used to distinguish between strong tornadoes and weaker ones.
The level of winds are estimated by the damage inflicted on buildings and the environment.
As you can see from the original Fujita scale an F4 tornado has winds of over 200 mph and can cause catastrophic losses if it moves into a metropolitan area like Houston.
On November 21,1992 Pasadena, or more specifically the Sterling Green subdivision, took on the wrath of a tornado that was over a half mile wide.
The pictures from this neighborhood look like a bomb went off, with over 1000 homes damaged, and 400 destroyed.
Some homes only had a foundation left when the home owners returned to
search through the rubble. The real story in all this is the fact that there was no loss of life and only 15 injuries. In a densely populated city like Pasadena that is a miracle.
Most homeowners that survived described the color of the sky shortly before the disaster as green or very dark.
Most survived by taking shelter on the first floor in a hallway or closet. They stayed away from windows due to the large number of flying projectiles that the tornado picks up as it travels on the ground. Some had only time to dive under heavy furniture or hide between
appliances as a means of protection. Today only a single empty lot remains as a reminder of this great disaster. The home owner decided not to rebuild that home and sold the lot.
As Spring approaches keep an eye to the sky and a weather radio or TV set on. Stronger F4 tornadoes are usually visible on Doppler radar screens and they stay on the ground for several minutes. Weaker F0 and F1 tornadoes more common in Southeast Texas are harder to see and only last a few minutes. By the time these weaker less destructive funnels are spotted its usually to late to relay any warnings or the tornado has lifted back into the clouds.