Historical clue formulations

• Sudden surge — 2025-08-17
• Deluge — 2023-08-13
• Incoming deluge — 2022-07-11
• Stampede — 2022-05-31
• Blitz — 2019-03-04
• Deluge — 2018-03-26
• Strong spate — 2012-10-30
• Stampede — 2010-12-05
• Torrent — 2008-09-16
• Forward flow — 2006-03-13
• Charge — 2002-10-06
• Torrent — 2000-12-24
• Surge — 1998-08-03
• Torrent — 1994-12-18