In May of 2007, a grade 5 tornado (the highest possible) destroyed the town of Greensburg, Kansas, killing 13 people, injuring more than 60 others and flattening 95 percent of the town structures (while seriously damaging the other 5 percent). The tornado was estimated to be 1.7 miles (2.7 km) wide at its base, and traveled almost 22 miles (35 km). Wind from the twister was estimated at 205 mph (330 km/h).
In May of 2011, a grade 5 tornado ravaged the city of Joplin, Missouri. Although this tornado was only .75 miles at its base, and traveled 6 miles on the ground, it also had winds estimated at over 200 mph, and, because this tornado hit a city rather than a small town, it had far more devastating figures of destruction: 158 people died, over 1000 people were injured, and around 7,000 homes were destroyed (not including businesses and public buildings).
According to the NOAA (National Oceanic and Atmospheric Administration) an average of 1253 tornadoes occur in the United States every year. Although more common in “tornado alley” (the Midwest), tornados have been documented in every state in the U.S. After the United States, the country with the largest average number of annual cyclones is Canada, with around 100 twisters.
If there’s a relatively high probability that your home will be completely destroyed in a storm, then “long-lasting” won’t be one of your main concerns when buying it or having it build for you.