U.S. flag

An official website of the United States government

Dot gov

Official websites use .gov

A .gov website belongs to an official government organization in the United States.


Secure .gov websites use HTTPS

A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites..

Tornado Risk

A jurisdiction has high tornado risk if it is located in any county within the 250mph wind speed zone shown in Figure 304.2(1) in ICC 500-2014.

Last updated May 5, 2021