Severe weather warnings are typically sent to phones for tornadoes, flash floods or hurricanes, but those alerts are not issued for thunderstorm warnings. Boat operators would have known about the warning if there was a radio on board, or if they got a Twitter alert on their phone, though any tour boat company likely would have some kind of communication in place.

7 p.m.

The area was hit with a severe thunderstorm with winds of 63 miles per hour.

\"PHOTO:
Courtesy Trent Behr
PHOTO: A video grab shows a tourist duck boat taking on water in a lake near Branson, Mo., July 20, 2018.
>

7:09 p.m.

The first call to 911 about the boat going under water was received shortly after 7 p.m., according to Stone County Sheriff Doug Rader.

\"PHOTO:
Courtesy Trent Behr
PHOTO: A video grab shows a tourist duck boat taking on water in a lake near Branson, Mo., July 20, 2018.
>

Between 7:16 p.m. and 7:44 p.m.

Local emergency dispatchers field calls about the rescue operation, requesting boats to help make water rescues and responding to reported injuries.

\"PHOTO:
Courtesy Trent Behr
PHOTO: A video grab shows a tourist duck boat taking on water in a lake near Branson, Mo., July 20, 2018.
>

Friday July 20, 6:06 a.m. local time

In a phone interview with \"CBS This Morning,\" the president of the company that owned the duck boat said that “no one was expecting” the storm but the boat “shouldn’t have been in the water if what happened happened.”

\"PHOTO:
Southern State County Fire Protection District/Reuters
PHOTO: Rescue personnel are seen after an amphibious "duck boat" capsized and sank, at Table Rock Lake near Branson, Stone County, Mo., July 19, 2018.
>

7:40 a.m.

President Donald Trump shared his thoughts and sympathies with the victims and their families.

“My deepest sympathies to the families and friends of those involved in the terrible boat accident which just took place in Missouri. Such a tragedy, such a great loss. May God be with you all!” he wrote on Twitter.

My deepest sympathies to the families and friends of those involved in the terrible boat accident which just took place in Missouri. Such a tragedy, such a great loss. May God be with you all!

— Donald J. Trump (@realDonaldTrump) July 20, 2018

1 p.m.

The first investigators from the National Transportation Safety Board are expected to arrive on the scene.

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