Historical clue formulations

• Phone notifications — 2026-08-02
• Tips off — 2025-08-25
• Forewarns — 2025-02-24
• Gives a heads-up — 2023-10-28
• Tips off — 2023-07-16
• Sources of some dings — 2023-05-05
• Smartphone screen displays — 2021-09-11
• See 5-Across — 2020-12-24
• Warnings — 2020-06-30
• Bells and whistles, maybe — 2019-04-03
• Sirens, e.g. — 2016-08-14
• "Fore!" and others — 2016-06-08
• Messages often with exclamation points — 2016-05-12
• Gives a heads-up — 2016-04-26
• Gives a tip — 2015-12-11
• "Someone may have accessed your account" and others — 2015-03-10
• Tip-offs, maybe — 2014-12-20
• "You've got mail!" and such — 2014-11-14
• All-points bulletins, e.g. — 2013-07-01
• Tips — 2008-05-03
• Warnings — 2008-02-18
• Red lights and flares — 2007-12-27
• Color-coded government announcements — 2006-05-31
• Some computer messages — 2006-02-03
• Critical warnings — 2004-12-30
• "Heads up!" and others — 2004-04-20
• Tips off — 2004-03-14
• They may be red — 2003-10-01
• Advisories — 2002-01-06
• Flashing lights, say — 1999-12-25
• Forewarns — 1998-06-29
• Signals — 1997-11-19
• Advisories — 1997-10-26
• Advises — 1997-09-06
• Warns — 1996-10-21
• Heads-up notices — 1996-08-07
• Some are red — 1996-03-24
• Sirens — 1995-08-15
• Storm sirens — 1995-05-30
• All-points bulletins — 1995-03-30
• Air-raid warnings — 1994-08-11