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Radar Tutorial
Chapter 1, Page 8: High Precipitation Supercell
A High Precipitation (HP) Supercell is more common in the eastern half of the United States. Its well known for incredible rain production, sometimes greater than 10 inches in an hour. Another obvious difference is noticeable in the field is that fact that the usually "rain-free" base at the rear of the storm is mostly wrapped with rear flanking downdraft precipitation, rain and/or hail. The "slot" of inflow can be as little as a mile wide. That means the tornado may only be visible from the small inflow "slot", usually to the south or southeast of the storm.
This is a very dangerous supercell in that you cannot see the tornado while chasing and there is no quiet before the tornado as told by folklore.
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