Of the list of terms and phrases below, select the ones that describe either formation areas or atmospheric conditions ideal for supercell thunderstorm development.
Group of answer choices
the US Central Plains states in spring
the warm sector of a developing mid-latitude cyclone
strong upper-level convergence
strong surface convergence
strong updrafts
the US Pacific Northwest in summer
cool, dry air in the mid-levels above warm moist air near the surface
strong vertical wind shear