εἰλῦφάζω

From LSJ

ἔξαψις σφοδρὰ μετὰ πολλῆς βίας πίπτουσα ἐπὶ γῆς → a violent flare-up falling on the ground with great force, thunder and lightning

Source

English (Autenrieth)

(ϝειλ.): whirl about; φλόγα, Il. 20.492†.