The intensity of a tornado is usually judge based on an analysis of the damage, which is used to estimate wind speed.
yes
In most cases the intensity of a tornado is never actually measured. Tornadoes are rated based on the severity of the damage they cause. Mobile Doppler radar can measure wind speeds in a tornado, but since such radar cannot measure ground-level winds the measurements are not used in ratings.
A scale is used to measure things...I see you've tagged "tornadoes" so you may be referring to the Fugita Scale--which is used to measure the damage caused by a tornado.
There is no particular instrument used for measuring tornado intensity. Ratings are based primarily on damage assessment. Occasionally doppler radar has measure wind speeds inside a tornado, but such measurements are rare.
Weight is not something that is measure in a tornado. Even then, the size of a tornado, and therefore the amount of air it contains, varies widely.
If a tornado passes near or over a barometer, it will measure a very rapid drop in pressure. How much the pressure drops depends on the strength of the tornado and how close the center of it comes tot he barometer.
the fujita scale now called the enhanced fujita scale rates tornadoes in intensity
Nothing, really. There was no metric in place to evaluate tornado damage. This is why it was such an important advancement.
The Fujita and Enhanced Fujita scales assesses damage caused by a tornado to assign a rating.
The are various instruments that scientists have deployed. Most tornado probes carry barometers to measure the pressure inside a tornado. Some have held a variety of anemometers to measure wind speed. A few have had cameras.
In some cases, Doppler radar is used to measure winds inside a tornado. However, as these measurements are rare and cannot scan ground-level winds, they are not used in ratings. The intensity rating is determined based on analysis of damage.
The strength of s tornado is measured on the Enhanced Fujita scale, which uses the severity of the damage a tornado causes to assign an intensity rating, ranging from EF0 for the weakest tornadoes to EF5 for the strongest.