Bluish — Green

: Severe thunderstorms and supercells can exhibit a "bluish-green" glow. This is caused by sunlight reflecting through heavy precipitation, often indicating the presence of large hail rather than being a direct indicator of a tornado.

: High-quality versions often feature a triple-layer design, such as 600D waterproof Oxford cloth on the outside, thickened cotton for insulation, and an aluminum foil inner layer. bluish green

: They act as a thermal seal, blocking wind and heat loss to keep rooms warmer during winter. : Severe thunderstorms and supercells can exhibit a