Luke 12:54

And he said also to the people
For what Christ had before said, were chiefly, if not solely, directed to his disciples; but now he turned himself to the innumerable multitude that were about him, and particularly addressed himself to the Scribes and Pharisees that were among them:

when ye see a cloud rise out of the west;
the watery vapours being attracted by the heat of the sun, out of the Mediterranean Sea, which lies west of the land of Judea, and formed into a cloud, and drove by the wind:

straightway ye say there comes a shower;
as soon as it is seen, it is presently concluded and affirmed, that a very heavy shower will soon fall, it having been frequently observed so to do, when this has been the case:

and so it is;
for the most part, there commonly follows a large shower on such an appearance, and they were seldom mistaken in their conclusions.