Historical clue formulations

• Tips off — 2025-02-21
• Premonishes — 2018-12-21
• Gives a yellow flag — 2008-07-15
• Issues an advisory — 2007-12-24
• Tips off — 2005-09-30
• Yells "Heads up!" at — 2000-01-09
• Alerts — 1997-12-28
• Gives notice — 1997-11-06
• Alerts — 1997-04-30
• Gives safety information — 1997-01-25