‘Tropical Storm Harvey’ may be the biggest storm to hit the U.S. in a century: Study

More than 30 million Americans have been affected by Hurricane Harvey, according to the National Weather Service.

More than 40,000 homes have been damaged or destroyed, with a total loss of $3.7 trillion in economic activity.

The National Weather Services released a map showing the damage and destruction.

The U.N. has estimated that as many as 15 million people are at risk of being displaced by Harvey.

The damage has been massive, with more than 1.2 million homes destroyed.

The city of Houston alone has lost more than 2.6 million people.

Here’s what you need to know about the storm and the people affected.