You could observe an overshooting top if the storm were 30 or 40 miles away, but not 3 or 4. 2. You should be very concerned. A shelf cloud is an indication of a strong downdraft at the leading edge of the storm. When the visible funnel reaches more than halfway down to the ground, look for a possible debris cloud at the surface. The funnel may actually have touched down, but has not picked up enough dust and debris to become visible.
Marbles come in many different sizes.
This will eliminate any possible confusion as to the size of hail you are reporting. The storm has a weak updraft and probably will not become severe. Research has shown that the type and frequency of lightning are not related to the severity of a thunderstorm. Primary is 146.88. Backup is 146.76.