Why does it hail when there's no tornado outside?

Tornadoes themselves are not the cause of hail, thunderstorms are.

In order to produce hail a storm must have a strong updraft to keep hailstones in the air as they form and a fairly large amount of turbulence to create the cycle that forms hail.

Tornadoes also need a strong updraft to form but also need other factors such as rotation in the storm to form, but this rotation isn't needed for hail.