Mat 16:2. Ὀψίας, πρωἰ, evening-morning) Two most common and most popular signs;[709] for when the sky is red in the evening, the coldness of the night astringes the thinner vapours, so that no storm occurs, even though there be wind; on the other hand, when in the morning the sky is red and dark, the thick vapours burst into a storm by the heat of the sun.
[709] Although, from the different relations of the powers of nature, they are not applicable to all climes.-App. Crit., Ed. ii., p. 124.