Inuyasha268,
many thanks...understood...
Old English Proverb "Red sky at night shepherd's delight. Red sky in the morning shepherd's warning" (there are variations though, i.e. sailor)
http://www.tribaleye.co.uk/htm/skyscapes.htm
although the subject largely consists of 'old wives tales', the most famous one of all is one of the most reliable around, and with sound scientific background.
There are two explanations for "red sky at night, shepherds' delight":
1. The passage of a cold front eastwards will allow the setting sun in the west to reflect off the tops of the cloud causing a reddening of the sky at dusk.
The passage of a cold front causes a rise in pressure, and more especially for eastern parts of the region, a couple of days of decent weather.
2. High pressure usually means fine weather. An inversion is also associated with this, which effectively is a 'lid' on the atmosphere which acts to trap dust and other pollutants.
The setting sunlight is scattered by these particles, leaving the longest wavelength, red, to illuminate the evening sky. So, if the sky is red, it can illustrate the inversion and high pressure is in place and the next day often is fine.
And one explanation for "red sky in the morning, shepherds' warning":
1. A warm front slopes forwards, and the first hint of such an approaching front is very high (often invisible) cirrus cloud at around 36000 feet. As the sun rises in the east, it reflects on this ice cloud, again turning red as the light is scattered. Hence if the weather conditions are appropriate, a red sky in the morning can mean an approaching weather front, and rain in the next 12 hours.
But I guess you knew this already
Also if you have a Bible handy check out Matthew 16:2-4.
"...He replied, "When evening comes, you say, 'It will be fair weather, for the sky is red,' and in the morning, 'Today it will be stormy, for the sky is red and overcast.' You know how to interpret the appearance of the sky, but you cannot interpret the signs of the times. ."