06/17←  2025-06-18 CWB twsfc map  →06/19

2025-06-18 00 UTC	2025-06-18 03 UTC
2025-06-18 06 UTC	2025-06-18 09 UTC
2025-06-18 12 UTC	2025-06-18 15 UTC
2025-06-18 18 UTC	2025-06-18 21 UTC