If a tornado is spotted or detected, or if a rotation is detected that is likely to lead to a tornado, that is when a warning is issued.
A watch simply means that conditions are favorable for tornadoes, but does not mean that there is an imminent threat.
So a tornado is more likely to strike when a warning is issued.
tornado mostly showup at summer.
Oklahoma is more likely to have a tornado. Although New York does get tornadoes Oklahoma has them far more frequently.
"Worse" is not the word, let's say "more important": Tornado warning is more important. A tornado "watch" means weather conditions are such that there is a possibility a tornado could form. But there have been no tornadoes as of yet. A Tornado warning means A tornado has been spotted/touched down in your alert area. You should take cover if a tornado warning is issued for your area; go into a cellar, or the lowest, most inner part of your house where there are no windows (a downstairs or basement bathroom is ideal). Tornado watch? Merely continue to monitor the weather broadcasts.
A typical tornado lasts several hours, often more than 5 hours.
A tornado is most likely to happen in the United States in a section called "Tornado Alley". This includes Oklahoma, Texas, Kansas, Nebraska, North and South Dakota, Florida, Missouri, and more. A tornado is likely to form between 3 pm. and 9 pm.
It is impossible to make such predictions. The farther out you try to predict a weather event, the less certain it is. Where an individual tornado is likely to hit cannot be predicted more than a few minutes in advance.
They are both important but more severe would be a tornado warning. A watch means that conditions are favorable for the development of tornadoes meaning you should be watching the weather, prepare a place to go, and watch the skies, local media, and on what ever you monitor the weather with online. I use the NWS but some people use local media and others use it all. Also, make sure that you have a NOAA weather radio to alert you if something happens
Arkansas gets more tornadoes
oklahoma
You are more likely to be hit in Oklahoma, which has the highest number of tornadoes per square mile.
A tornado watch usually does not warrant school closure as even when one is issued the chances of a tornado striking any given location are very low. Tornado warnings, which indicate a more imminent threat, are issued on too short a time scale for school closures.
You would be far more likely to see a tornado in Kansas. Kansas as the highest number of tornadoes per square mile of any US state.