Type U2. Sub-UTLS event
Within this group, there is one outlier: if there is an inversion between LCL and UTLS, significant towering pyroCu may occur. While outwardly resembling a pyroCb, these do not reach the altitudes required to qualify as a pyroCb – the cloudtop temperatures may not fall below -40°C, inhibiting in-cloud glaciation and lightning. The stronger the upper-level cap, the more the plume-top can visually resemble a pyroCb’s anvil.There can be interaction between fire weather and the plume, especially if the plume top is at high altitude, allowing strong convective dynamics near the fireground.
