Type S3. Smoke shield with towering pyroCu
If the profile has a strong convective cap, between roughly 6° to 8°C, then persistent towering pyroCu are likely to be present. The plume cannot pass the cap, except in its core which pushes past, forming a towering pyroCu. Once initial upward momentum and the effects of latent heat of condensation dissipate this persists for some time. The rest of the plume also spreads out sideways as it advects away from the fire. There can be some immediate downwash of large aerosol.