Esme and Jake Horton are related.
The Reality Check is on the British Broadcasting Corporation.
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The image caption is.
More than 70 people have died in Kentucky as a result of the tornadoes.
Several US states have been hit by tornadoes, with an expected death toll of more than 100.
This December has seen a record number of tornado warnings, which are extremely rare outside the spring and summer.
Is climate change causing stronger tornadoes?
thunder clouds form when warm moist air is trapped by cooler air.
The warm air creates an updraft.
The air column rotates if there are strong winds moving in different directions.
Warm air is drawn in, speeding up the wind spiral, which then extends out of the thunder clouds.
This is a tornado when it touches the ground.
The image is from the same source.
In the hotter months there is more warm moist air.
In the US, a cluster of tornadoes of this size and power in December is extremely rare.
More tornadoes have been recorded in the past 20 years than the previous 20 - but some of this is due to improved tracking.
Less severe tornadoes have been recorded more consistently as data-collecting methods have improved.
"To an untrained eye, it may look like we are having more of these events happening - but in reality what is happening is we have much better tools for identifying relatively weaker tornadoes," says Dr Jana Houser, professor of meteorology at the University of Ohio.
There are more likely clusters of tornadoes when six or more start within six hours.
There are more tornadoes on days with an average of 100 compared with 150 in the 1970s.
Climate change can't be blamed for every weather event.
The patterns of the atmosphere have changed as the amount of tornado clusters has increased, according to HaroldBrooks at the US National Oceanic and Atmospheric Administration.
"That may be related to climate change, but we can't make a full conclusion," he says.
Extreme weather events are more likely to be destructive when temperatures rise.
There is no scientific consensus on tornadoes.
It is not the same as the consensus on the increase in heatwaves or heavy rain.
There is a lack of conclusive evidence on how a warming climate will affect tornadoes, but wind speed and energy in the atmosphere are two of the main drivers.
The Environmental Protection Agency and others will be asked by US President Joe Biden to look at the role of climate change.
He said that everything is more intense when the climate is warming.
The Intergovernmental Panel on Climate Change found some conditions that will increase due to increasing temperature and humidity.
There are other conditions that may affect the likelihood of tornadoes.
There is no evidence that tornadoes are getting stronger.
The US had had no highest-category tornado in the last three years.
The image is from the news.
The image caption is.
The tornado went from Arkansas to Kentucky, causing terrible damage to homes.
The Quad-State is a swathe of Arkansas, Missouri, Tennessee and Kentucky that was cut by the most devastating of this weekend's tornadoes.
It is not the wind speeds that were record-breaking, but its size.
It was three-quarters of a mile wide and traveled for more than 220 miles, which is more than the distance from London to Paris.
According to the National US Weather Service, tornadoes are 50 yards wide and travel a few miles.
The central US has a strip of Tornado Alley.
Areas of Texas, Louisiana, Arkansas, Oklahoma, Kansas, South Dakota, Iowa and Nebraska are included.
There is evidence that shows a shift to having more tornadoes in the southern US.
"Tornado Alley is not well defined, so that is hard to say, if there is a definite shift."
Over the last 40 years, we have seen an increase in tornadoes in the mid-South region and a decrease in the Texas, Kansas region.
It is not a huge shift.
There are tornadoes.
Climate change.
Reality check.
The United States.
