Red sky in the morning, sailor take warning.
Red sky at night, sailor's delight.
Like a red morn that ever yet betokened,
Wreck to the seaman, tempest to the field, Sorrow to the shepherds,
woe unto the birds, Gusts and foul flaws to herdmen and to herds.
Shakespeare, Venus and Adonis
The Pharisees and Sadducees came, and to put him to the test they asked if he would show them a sign from heaven. He replied, 'In the evening you say, "It will be fine; there's a red sky," and in the morning, "Stormy weather
today; the sky is red and overcast." You know how to read the face of
the sky, but you cannot read the signs of the times.
Matthew, Chapter 16, Versus 2 through 3.