Ordinary Cells Multicell storms Supercells Deep Convection Conceptual Models Based on Physical Processes Discussion Ordinary Cells Multicell storms Supercells

Ordinary Cells Notice: First radar-detected echo is aloft, not at the surface No updraft tilt Precip core and downdraft wipe out updraft Gust front spreads out equally in all directions Storm motion is mean 0-6 km environmental flow.

Multi Cells Notice: Cells in different stages of their evolution New cell development occurs on the downshear side of the gust front (cold-pool/shear balance occurs there)

Multi Cells Notice: Cells in different stages of their evolution New cell development occurs on the downshear side of the gust front (cold-pool/shear balance occurs there)

Multi Cells Notice: The reflectivity at the ground is largely associated with cell number 3. The updraft may have some tilt to it if there is some shear through a layer deeper than the cold pool.

Multi Cells Notice: The updraft and downdraft are well separated – allows the system to live for a long period of time In a system relative sense, the inflow is from the east if the shear vector is westerly

Multi Cells Cloud features and weather: Shelf cloud Overshooting tops Back shear anvil hail High winds Possible tornadoes on the gust front

Multi Cells Shelf cloud example:

Supercells Notice: This evolution is for a straight hodograph Produces mirror image split supercells

Supercells Notice: This evolution is valid for a clockwise turning hodograph Produces a dominant right-moving supercell Is typically observed over the US Plain States in spring and early summer

Supercells Notice: This evolution is for a counterclockwise turning hodograph Produces a dominant left mover Not commonly observed over the US Plain States

Supercells

Supercells

Supercells