05/14←  2025-05-15 CWB twsfc map  →05/16

2025-05-15 00 UTC	2025-05-15 03 UTC
2025-05-15 06 UTC	2025-05-15 09 UTC
2025-05-15 12 UTC	2025-05-15 15 UTC
2025-05-15 18 UTC	2025-05-15 21 UTC