Weather-gaw

They asked Wattie, who was a very religious man, what could have induced him to gather his sheep on the Sabbath day? He answered, that he had seen an ill-hued weather-gaw that morning, and was afraid it was going to be a drift.

[S]ee how much heavier the clouds fall every moment, and see these weather-gaws that streak the lead-coloured mass with partial gleams of faded red and purple.

‘The weather-gaw’ he scans above the hill, / Wherein the rainbow's hues with watery sheen / Gleam beautiful upon the grey-dark sky, / Yet ominous of storm; […]

Weather-gaw, part of a rainbow seen, the greater part of the bow being intercepted.

The weather's taking up now, / For yonder's the weather gaw; / How bonny is the east now! / Now the colours fade awa'.

After supper I'll take you home—if the weather keeps good-humoured. Those weather-gaws aren't out for nothing. It'll rain cats and dogs to-morrow.

"This is a fine day after the storm." "Aye, but aa doot it's a weather-gaw."