03/31←  2025-04-01 CWB twsfc map  →04/02

2025-04-01 00 UTC	2025-04-01 03 UTC
2025-04-01 06 UTC	2025-04-01 09 UTC
2025-04-01 12 UTC	2025-04-01 15 UTC
2025-04-01 18 UTC	2025-04-01 21 UTC