weather-gaw

noun2

1. •
   (dialect, UK) An instance of some phenomenon in the sky said to signal bad weather, such as an incomplete or secondary rainbow, or a parhelion or sun dog; a weather-gall or water-gall.

   • [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. — 1822
2. •
   (dialect, UK) A period of fine weather in the midst of bad weather.

   • "This is a fine day after the storm." "Aye, but aa doot it's a weather-gaw." — 1893