People seeing a shelf cloud may believe they have seen a wall cloud.
2.
Scud are usually found under shelf clouds.
3.
This is likely a mistake, since an approaching shelf cloud appears to form a wall made of cloud.
4.
From the ground, outflow boundaries can be co-located with the appearance of roll clouds and shelf clouds.
5.
A very low shelf cloud accompanied by these signs is the best indicator that a potentially violent wind squall is approaching.
6.
A shelf cloud usually appears on the leading edge of a storm, and a wall cloud will usually be at the rear of the storm.
7.
A sharp, strong gust front will cause the lowest part of the leading edge of a shelf cloud to be ragged and lined with rising fractus clouds.
8.
As thunderstorms fill into a distinct line, strong leading-edge updrafts occasionally visible to a ground observer in the form of a shelf cloud may appear as an ominous sign of potential severe weather.
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