USAA says it has received 1,300 auto and property claims.

“An official estimate of the number of destroyed homes has not yet been released, however the 1999 EF-5 tornado that followed a similar path to Monday's EF-5 Moore tornado destroyed more than 8,000 homes,” says Tim Doggett, AIR's senior principal scientist, in a statement.

Localized hailstorms also occurred in Missouri and there were tornado sightings in Missouri, Texas, Kansas, Arkansas, and Colorado, but the two-mile-wide Moore tornado was the most damaging, AIR says.

An AIR analysis found that many homes in Oklahoma are built on concrete slabs because of soil conditions in the state and so there were few basements, although the modeler notes that underground shelters are considered the safest places to hide when a tornado passes.

The town of Moore also does not have an official tornado shelter, according to the town's website.

Mostly wood-frame residential houses populated the affected community, which AIR says are more vulnerable to high winds and fling flying debris than brick masonry houses.

According to the Insurance Information Institute, tornadoes have caused $97.8 billion in insured losses in the U.S. between 1990 and 2009, making these weather events second only to hurricanes ($152.4 billion) over this same time period as the costliest natural disasters. Between 2008 and 2010, tornadoes have caused $30 billion in insured losses.