Strong’s Greek
G4449 — purrhazo
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
πυρράζω
purrhazo — pronounced poor-hrad'-zo
from 4450; to redden (intransitively):--be red. see GREEK for 4450
2 occurrences in the KJV.
Matthew 16:2
He answered and said unto them, When it is evening, ye say, It will be fair weather: for the sky is red.
Matthew 16:3
And in the morning, It will be foul weather to day: for the sky is red and lowering. O ye hypocrites, ye can discern the face of the sky; but can ye not discern the signs of the times?