Their occurrence appears to be connected with the location of the jet stream.

The first occurrence of the name Aubin vert itself appeared in 1829.

Natural occurrence appears to be infrequent although only a limited number of surveys have been carried out.

Several occurrences that happen within the house appear in both time periods.

The first occurrence of the name of each person mentioned in the column appears in bold face.

It is not until the beginning of the 16th century that first occurrence of the word "Walloon" appeared in the current linguistic sense.

Ghosts and paranormal occurrences appear in the real world, spreading through the town.

This occurrence is rare and only appears with the use of async triggers.

The occurrence of noctilucent clouds appears to be increasing in frequency, brightness and extent.

Such occurrences have appeared in the television series Law & Order.