What is the barometric pressure before a tornado?

Answer 1

It is not know for certain. One thing that is known is that the pressure is low inside a tornado. The intensity of a tornado is largely determined by the pressure deficit, meaning how much lower the pressure inside the tornado than its surroundings. It is estimated, that a strong tornado will have a pressure deficit of at least 25 millibars, so that if the pressure surrounding the tornado is 950 millibars, the core pressure will be 925 millibars. A violent tornado may have a pressure deficit of over 100 millibars.

Answer 2

The barometric pressure before a tornado will generally be lower than average, as tornadoes, like other forms of stormy weather, are associated with low-pressure systems. The tornado itself produces a sharp drop in pressure, which like starts a few miles from the funnel. We cannot give specific pressure values though, as that pressure will vary depending on elevation and from one storm to the next.

Answer 3

Very low. The exact reading will differ significantly depending on how strong the tornado is---but it's always a lot lower air pressure inside than outside of the tornado.

Answer 4

Air pressure drops sharply inside a tornado.

Answer 5

The air pressure in a tornado is quite low. In a strong tornado, the pressure may be as much as 50-100 millibars lower than the surrounding environment.