There are two primary ways. First is Doppler radar, which measures winds moving toward and away from the radar to detect features in a storm that can produce a tornado, and sometimes the signature of the tornado itself. Then, by simply looking at where the storm is going they can warn places in the potential path. However, radar cannot determine if a tornado has actually touched down, and can occasionally miss a tornado.
For this reason there are storm spotters. These are people who report severe weather such as tornadoes to authorities. Through such reports meteorologists (weather scientists) can gain a better idea of the potential threat.
If there is a tornado then the National Weather Service will issue a tornado waring saying a tornado has been detected.
The main tool meteorologists use is Doppler radar, which can detect a tornado or the rotation in a storm that can produce them. There are also spotters, who report sightings of tornadoes and other weather hazards.
Meteorologists can detect the signature of a tornado or the rotation that may lead to one using Doppler Radar, which can measure wind speeds at a distance. They also receive reports from weather spotters who report tornadoes and other severe weather as they occur.
If we did not know the weather conditions than we could get into big disasters. For example, if we knew that there might be a thunderstorm coming there way or there was a tornado warning, we would be prepared for what might happen.
It is impossible to know when the "next tornado" or other weather event will be anywhere. Weather forecasts don't work that way.
I used to live in Tornado Alley... a tornado watch means that the weather conditions mean it is very likely that a tornado will form in an area. A tornado warning means a tornado has touched down nearby.
The weather people know when a hurricane is coming because they have weather instruments. Or maybe the satellites in the atmosphere take pictures of energy and broadcast it to the weather station.
Scientists can detect the signature of a possible tornado using Doppler radar. However, they rely on reports from spotters, police, and the general public to know if a tornado is actually on the ground.
Most likely not. Sometimes animals might know a storm is coming before we do, possibly because they can hear the thunder, but they probably cannot specifically know about a tornado.
Because books don't tell you the weather that is coming your way. If you have a tornado watch going on in where you live, how would you know? Would reading a regular paper book tell you a tornado's coming for you?
There is know way of knowing that. The development of an individual tornado might be predicted, at most, a few minutes ahead of time
Tornadoes cannot be predicted in advance like that. So it is impossible to know that. watch the weather channel for tornado warning (s)