A baroclinic high is different from a barotropic high in that it is initially associated with temperature contrasts, which strengthen upper level features which in turn strengthen the high. A baroclinic high is most likely to dissipate quickly in mountainous areas, where the increased friction reduces air velocity, and in turn reduces the Coriolis force. This allows air to flow more directly away from the high pressure area. The entrainment of dry air into the thunderstorm can allow massive evaporational cooling in the downdraft, accelerating its motion and producing damaging outflow wind. The updraft is linear and is aligned along the leading edge of the squall line.
Tornadoes are more likely if a squall line breaks up into isolated cells.
The suspect section of the storm is a bow echo, and it indicates a possibility of strong winds. Storm splitting can cause a supercell to split into two mirror images, the left split with anticyclonic circulation and the right split with cyclonic circulation. The most significant danger of LP supercells is large hail. Large hail and damaging winds are often associated with HP supercells. This chapter has no review questions.