Exodus 19:16וּבְרָקִים
On the third day, when morning came, there was thunder and lightning. A thick cloud was upon the mountain, and a very loud blast of the ram’s horn went out, so that all the people in the camp trembled.
Job 20:25וּבָרָק
It is drawn out of his back, the gleaming point from his liver. Terrors come over him.
Psalm 18:14וּבְרָקִים
He shot His arrows and scattered the foes; He hurled lightning and routed them.
Jeremiah 10:13בְּרָקִים
When He thunders, the waters in the heavens roar; He causes the clouds to rise from the ends of the earth. He generates the lightning with the rain and brings forth the wind from His storehouses.
Ezekiel 1:13בָרָק
In the midst of the living creatures was the appearance of glowing coals of fire, or of torches. Fire moved back and forth between the living creatures; it was bright, and lightning flashed out of it.
Nahum 2:4כַּבְּרָקִים
The chariots dash through the streets; they rush around the plazas, appearing like torches, darting about like lightning.

Brown-Driver-Briggs

בָּרָק n.m. lightning

1. lit. mostly pl. = lightnings, lightning flashes

2. fig. (always sing.) of flashing arrow-head

Sources: Brown-Driver-Briggs (1906, public domain) from the Open Scriptures Hebrew Lexicon (CC BY 4.0), glosses from STEPBible TBESH (CC BY 4.0); STEPBible TAHOT (Hebrew Bible, Leningrad Codex, CC BY 4.0); the Berean Standard Bible (public domain). Reformatted by Word Study, wording unchanged. All sources and licenses.