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What causes tornadoes and how to decipher watches and warnings

FILE - This image made from a May 24, 2016 video by KWTV-KOTV, shows a funnel cloud moving across the field near Dodge City in Ford County, Kan. (KWTV-KOTV via AP, File)
FILE - This image made from a May 24, 2016 video by KWTV-KOTV, shows a funnel cloud moving across the field near Dodge City in Ford County, Kan. (KWTV-KOTV via AP, File) FILE - This image made from a May 24, 2016 video by KWTV-KOTV, shows a funnel cloud moving across the field near Dodge City in Ford County, Kan. (KWTV-KOTV via AP, File)

When severe weather hits the United States, there are ways people across the country can prepare for the potential impact of hail, rain, damaging wind and more.

Tornadoes can take down power for thousands of people, cause catastrophic property damage and kill. The U.S. sees about 1,200 tornadoes each year.

Experts say watching forecasts and knowing the meaning of different stages of warnings are key to safety.

Here’s what to know about the causes for these storms, and the alerts for watches, warnings and emergencies.

What can cause a tornado?