Red sky at night, Shepherds Delight - is it true?

This week's Gallery is 'Sky'

Jesus (Matthew 16:2-3):

When it is evening, you say, “It will be fair weather; for the sky is red.”
And in the morning, “It will be stormy today, for the sky is red and threatening.”

Shakespeare:

"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.”

The old rhyme:

"Red sky at morning, sailors take warning; Red sky at night, sailors' delight."

Or the more commonly used:

"Red sky at night, shepherds' delight; Red sky in the morning, shepherds' warning."

Or the Met Office:

"The saying is most reliable when weather systems predominantly come from the west as they do in the UK. Red sky at night means fair weather is generally headed towards you.
A red sky appears when dust and small particles are trapped in the atmosphere by high pressure. This scatters blue light and leaving only red light to give the sky its notable appearance.
A red sky at sunset means high pressure is moving in from the west so therefore the next day will usually be dry and pleasant. "Red sky in the morning, shepherds warning" means a red sky appears due to the high pressure weather system having already moved east meaning the good weather has passed, most likely making way for a wet and windy low pressure system."