The Wall Cloud Wall
Mesocyclonic Mother Ship over I-80
A high-based wall cloud hovers like a refugee from Independence Day over I-80 in the Nebraska Panhandle. Like most wall clouds, this one was non-tornadic -- luckily for the trucker! Winds strong enough to blow vehicles off the road can occur around and under wall clouds, even if they never drop a tornado. For that reason, it can be a matter of life and death to avoid wall clouds -- or if you are a weather spotter, to monitor and report them. This supercell would soon get undercut by outflow and perish -- as do many high plains storms with weak surface inflow.
2 WSW Dix NE (21 May 98), looking W