Changes tornado

The central tornado was the largest, almost a
thousand feet in diameter. The two smaller tornadoes
were a quarter as wide and orbited the larger one.
Clark hesitated for a moment, his mind racing for what
he knew about tornadoes.

They received their energy from warm, moist air
rising from the base, while cold air dropped from
above, and they dissipated when the cold air from
above wrapped around the tornado and cut it off from
the energy supplying it.

Taking a deep breath, Clark began to go to work,
spraying cold air as close as possible to the base of the
smaller tornado to his left. With any luck he'd be able
to dissipate that one more quickly than the central
storm and would be able to do the same to the other.
Each of the tornadoes was equally deadly,
although the central one was going to carve a wider
path

[...]

It wasn't as easy as Clark had hoped. The moment
he'd begun to freeze the air at the base of the first
tornado, it had begun to move wildly, unpredictably.
After a moment he decided to try something else.
Blasts of heat at the top of the tornado followed by
blasts of cold at the bottom. He could see that it was
having an effect, but not fast enough.

He turned to the next tornado and winced as he
saw cars from the parking lot flying through the air. It
was going to be close, no matter what he did.
Clark was learning, but it wasn't fast enough, and
while he was learning, people were going to
be dying.

It was then that Clark began to see a pattern to the
behavior of the tornado's movements in response to
what he was doing.

If he couldn't stop the storm in time, perhaps he
could change its course.

Pgs. 101-102