Stopping a tornado

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How about a hose that shoots really cold, dry air, because there would be no more warm, moist air to fuel the tornado.

That would work, if you had about a third of the arctic atomosphere and your hose was big enough to pump it by a few million gallons a second. And even then, the change and effect would still take awhile, you'd have to do it before it got started, otherwise by the time you put enough cold dry atmosphere to actually affect the storm it'd probably be over.

Perhaps we could also freeze the Atlantic Ocean, and the Gulf of Mexico to keep hurricanes from forming.

What would be the heat sink?

ruveybn

Heat sink?

We'll send the heat to the arctic and antarctic and have an equatorial climate on the poles and a freezing climate in the center! Brilliant!

Can't wait to see girls in bikini's on the Ross Ice Shelf.

I think we could easily assign the LHC to deal with any tornadoes that happen once it goes active, just hit the super collider switch and let the black hole do the rest.
On a more serious note, no we couldn't, not without some sort of future tech that we haven't thought up yet.

If we could introduce a massive, artificial source of air pressure or heat, I'm sure we could destabilize it enough that it simply falls apart. Conventional explosives generate a significant quantity of air-pressure, and might be an option. Thermonuclear detonation can create massive amounts of heat and pressure. Microwaves could generate raw heat, with no real pressure gains. Liquid nitrogen or helium could sap out heat zones.

If you had an effective way to do this, it would be cheaper than having to rebuild several dozen homes, but again, it depends on the storm. Until we have an accurate way to predict what will happen, this is all pipe-dreams with technical feasibility behind it. Not every tornado is big enough to warrant stopping.

One way to stop the tornado is to prevent vortex shrink and spin up.

Tornado forms when the vertical vortex of the super cell shrinks and spins up (conservation of the angular momentum). If we can prevent the force which makes the tornado shrink, the vortex would become large but spin slower => slower winds.

First, we need to understand how such air vortexes work.

No. There is to much latent heat in warm sea water to de-energize a torndado.

ruveyn

Horsefeathers. Bull pebbles.

ruveyn

A supercell with a low cloud base is more likely to produce a tornado than one with a high cloud base. This is because there is less evaporation of rainfall below the cloud base. Less evaporation means a lower density difference between the rain and hail cooled air and the hotter unaffected surrounding air flowing into the storm. A lower density difference means the two airmasses can mix and still be buoyant enough to get re-ingested into the storm. Both are buoyant, but the undiluted air entering the storm slightly higher up is even more buoyant and thus accelerates upward faster than the air entering near the ground. This stretches the entire rotating air column of the supercell vertically, increasing the rotation rate and increasing the likelihood of a tornado.

It seems to me a nuclear detonation would destroy the original tornado and replace it with an even stronger tornado. Not only that, the supercell would carry all the radiation along with it and contaminate a huge area with radioactive precipitation.