Wandering Around in Prachuap

Silent lightning—what a spectacle.
The wind howling and a phenomenal light show!

Quoting Live Sience:

No, it is not possible to have lightning without thunder, according to NOAA.
Thunder is a direct result of lightning. If you see lightning but don't hear thunder, it is because the thunder is too far away. Sometimes, people refer to this as heat lightning because it most often occurs in the summer , but it is no different from regular lighting.