06/19←  2025-06-20 CWB twsfc map  →06/21

2025-06-20 00 UTC	2025-06-20 03 UTC
2025-06-20 06 UTC	2025-06-20 09 UTC
2025-06-20 12 UTC	2025-06-20 15 UTC
2025-06-20 18 UTC	2025-06-20 21 UTC