What Is A Supercell Thunderstorm?
QUICK ANSWER
A supercell is a severe thunderstorm with a persistent rotating updraft called a mesocyclone. Supercells last longer (hours) than ordinary thunderstorms (an hour or less), produce the most violent weather (including most tornadoes, large hail, and strong winds), and have distinct structural features visible on radar and from observers.
Supercell thunderstorms are the most dangerous type of thunderstorm, responsible for most tornadoes, the largest hail, and many of the most damaging severe weather events. What distinguishes a supercell from ordinary thunderstorms is the presence of a persistent rotating updraft. This single feature gives supercells their long life, characteristic appearance, and ability to produce violent weather.
What makes a supercell different?
Supercells differ from ordinary thunderstorms in one fundamental way: they have a persistent rotating updraft called a mesocyclone. In ordinary thunderstorms, the falling precipitation eventually cuts off the updraft, ending the storm in about an hour. In supercells, the rotating updraft tilts so the precipitation falls separately from where the warm air is rising. This separation lets the updraft continue indefinitely, sometimes for many hours, drawing in continuous warm moist air to fuel the storm. The persistent rotation also produces the violent weather supercells are known for.
What is a mesocyclone?
A mesocyclone is a rotating column of rising air within a supercell, typically 2-6 miles wide and 5-10 miles deep. It's smaller than a hurricane (mesoscale) but larger than a tornado. The mesocyclone forms when wind shear creates horizontal rotation that the storm's updraft tilts vertical. Mesocyclones are detectable by Doppler radar even when the storm is miles away, giving forecasters early warning of potential severe weather. About 30% of mesocyclones eventually produce tornadoes, with the rest producing other forms of severe weather without tornadoes.
What severe weather do supercells produce?
Supercells produce the most diverse and severe weather of any storm type. Tornadoes form almost exclusively in supercells (rare exceptions exist with non-supercell tornadoes). Large hail (1 inch or larger, sometimes baseball or softball-sized) is a supercell signature. Damaging straight-line winds over 60 mph are common. Heavy rainfall can cause flash flooding. Some supercells produce intense lightning rates. The combination of severe weather types makes supercells particularly dangerous. A single supercell can cause damage from multiple hazards simultaneously across its path.
How can you identify a supercell?
Supercells have several identifiable features. The most distinctive is a persistent rotating updraft, often visible as a striated or stacked-plate appearance on the rear flank of the storm. The forward flank often features heavy precipitation. A wall cloud (lowered cloud base) may form under the mesocyclone, sometimes producing tornadoes. The flanking line of growing cumulus often extends from the main storm. From a distance, supercells often have a distinctive 'mothership' appearance with rotating layers. Doppler radar reveals the rotation signature clearly.
What makes a supercell different?
Supercells differ from ordinary thunderstorms in one fundamental way: they have a persistent rotating updraft called a mesocyclone. In ordinary thunderstorms, the falling precipitation eventually cuts off the updraft, ending the storm in about an hour. In supercells, the rotating updraft tilts so the precipitation falls separately from where the warm air is rising. This separation lets the updraft continue indefinitely, sometimes for many hours, drawing in continuous warm moist air to fuel the storm. The persistent rotation also produces the violent weather supercells are known for.
What is a mesocyclone?
A mesocyclone is a rotating column of rising air within a supercell, typically 2-6 miles wide and 5-10 miles deep. It's smaller than a hurricane (mesoscale) but larger than a tornado. The mesocyclone forms when wind shear creates horizontal rotation that the storm's updraft tilts vertical. Mesocyclones are detectable by Doppler radar even when the storm is miles away, giving forecasters early warning of potential severe weather. About 30% of mesocyclones eventually produce tornadoes, with the rest producing other forms of severe weather without tornadoes.
What severe weather do supercells produce?
Supercells produce the most diverse and severe weather of any storm type. Tornadoes form almost exclusively in supercells (rare exceptions exist with non-supercell tornadoes). Large hail (1 inch or larger, sometimes baseball or softball-sized) is a supercell signature. Damaging straight-line winds over 60 mph are common. Heavy rainfall can cause flash flooding. Some supercells produce intense lightning rates. The combination of severe weather types makes supercells particularly dangerous. A single supercell can cause damage from multiple hazards simultaneously across its path.
How can you identify a supercell?
Supercells have several identifiable features. The most distinctive is a persistent rotating updraft, often visible as a striated or stacked-plate appearance on the rear flank of the storm. The forward flank often features heavy precipitation. A wall cloud (lowered cloud base) may form under the mesocyclone, sometimes producing tornadoes. The flanking line of growing cumulus often extends from the main storm. From a distance, supercells often have a distinctive 'mothership' appearance with rotating layers. Doppler radar reveals the rotation signature clearly.
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