Ok, so what counts as an emergency to use those lanes differs between countries ... but it sure seems super weird to explain how "emergency due to hail" is only in the spot where there is no hail, and at the same time, right next to the overpass where it's actually hailing, "no emergency" ...
If you would stop due to hail under on overpass but not wherever else you would get caught in hail - you are stopping just to protect the car, not due to an emergency.