Now Playing: East Coast Gets Its Taste of Flash Flooding

Now Playing: East Coast Hit With Storms As Texas Starts to Dry Out

Now Playing: Severe Thunderstorm Reports and Tornado Watches

Now Playing: New study sheds light on pandemic’s effect on language development in children

Now Playing: Feel Good Friday: Meet the teens making history at Harvard’s debate competition

Now Playing: ABC News Update: Naomi Osaka lights Olympic torch at opening ceremony

Now Playing: ABC News Live: Olympics officially begin with opening ceremony amid COVID-19 surge

Now Playing: COVID-19 cases, hospitalizations surge in Florida as delta variant spreads

Now Playing: How to watch surfing like an Olympic judge | FiveThirtyEight

Now Playing: Sleepaway camp reports positive cases of COVID-19

Now Playing: At least 80 large fires continue to burn in parts of the US

Now Playing: Bucks celebrate NBA title with massive parade, ceremony

Now Playing: How NFL is cracking down on COVID-19

Now Playing: This 57-year-old is a master at BMX

Now Playing: How Indianapolis Motor Speedway powered through the pandemic

Now Playing: Boxing gym to be honored at ESPN’s Sports Humanitarian Awards

Now Playing: ‘GMA’ says ‘Rise and Shine’ from Indiana amid reopening

Now Playing: A week in America’s gun violence epidemic

Now Playing: Homeowners rent their pools for summer

Now Playing: Morgan Wallen speaks to 'GMA' about being filmed using racial slur