What is a High-Precipitation Supercell?

A high-precipitation (HP) supercell is a type of supercell thunderstorm characterized by extreme rainfall, large hail, and dangerous winds. These storms are notorious for producing flash flooding due to the heavy precipitation concentrated around the storm’s updraft.

Unlike classic supercells, where precipitation is typically offset from the updraft, HP supercells have rain and hail wrapped around the rotating updraft, making it difficult to see tornadoes within them. This can increase the danger to those in the storm’s path, as tornadoes may be hidden by heavy rain.

HP supercells are often found in the central and eastern United States, particularly in the Great Plains and Midwest, where warm, moist air collides with cooler, drier air. They can produce severe weather hazards, including destructive winds, hail larger than golf balls, and long-lasting, rain-wrapped tornadoes.

Due to their ability to cause both wind damage and flash flooding, HP supercells pose significant risks to both property and life. Installing storm shelters or safe rooms can provide critical protection during these extreme weather events.