Should I be concerned about tornadoes when hail is observed?

The presence of large hail indicates very strong updrafts and downdrafts within the thunderstorm. These are also possible indicators of tornadic activity.

Often large hail is observed immediately north of a tornado track. The presence of hail doesn’t always mean a tornado. And, the absence of hail doesn’t always mean there isn’t a risk of tornadoes.

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1. Should I be concerned about tornadoes when hail is observed?
2. Is there a way to simply look at a thunderstorm and tell if it will produce hail at the ground?
3. How large can hail get?
4. Is there a way to estimate hail size or do I have to go outside and measure it?