Often, but not always.
No. Tornadoes are often accompanied by rain or hail, but if it is cold enough for snow, it is too cold for a tornado.
Tornadoes are often but not always accompanied by hail. However, the hail is not a result of the tornado itself but the storm that produces the tornado.
Hail does not depend on a tornado. Hail forms in thunderstorms with strong updrafts and turbulence. Many of these storms are not even capable of producing tornadoes as they have a strong enough updraft, but not enough rotation for tornadoes.
It can. Hail often does come before a tornado, but most storms that produce hail do not produce tornadoes.
No. Hail stones are caused by rising air in thunderstorms that blows rain upward to the height of the atmosphere in which temperatures are freezing. Many tornado producing storms have strong updrafts and also produce hail---but you can have hail without a tornado and likewise you can have a tornado without any hail.
No. Tornadoes occur during thunderstorms when the weather is warm. They often occur in a rain-free portion of a storm, but rain and often hail are generally nearby.
No, if there is a tornado or hail near a window is one of the least safe places to be.
Hail can occur in any part of Illinois.
Most severe thunderstorms do not produce tornadoes. If a tornado is detected or it is believed a storm might produce one a tornado warning is issued, which is more serious than a severe thunderstorm warning. A thunderstorm that produces a tornado is automatically classified as severe even if other severe weather (damaging non-tornadic wind or large hail) does not occur.
Not necessarily. Tornadoes typically form in the rear portion of a supercell thunderstorm, while hail is often found further forward. So in many cases and area will get hail before the tornado moves through. But that that does not mean the tornado has not formed yet.
Yes. The storm that produced the Joplin tornado also produced hail up to 1 inch in diameter in the Joplin area.
Tornadoes need thunderstorms to form and they usually form in the updraft portion of a supercell, which is in near the back of the storm. The downdraft portion, where most of the rain and hail can be found is in the from half.