How low does the air pressure on the barometer pressure have to be before a tornado will happen?

Question

in Manatee county,FL.

Answer 1

By the time the pressure decreases enough to be that typical of a tornado, the tornado will be at your front door.

Not all tornadoes cause the pressure to drop rapidly, however. Your best bet is to stay tuned to severe weather alerts during severe weather. And instead of watching the barometer in the event of a tornado, you should be seeking safe shelter.

This article describes 5 major warning signs of a tornado:

http://www.emergencypreparednesstips.org...

Keep in mind though that tornadoes often occur with little or no warning.

Answer 2

You can watch the fall when a hurricane is coming. BUT - With a tornado that change in pressure comes so swiftly there's no chance for any preparation.