early warning

noun

advance notice of some impending event or development
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Examples from the Web for early-warning

  • I would later learn this type of cruel behavior is often the first early-warning sign of developing schizophrenia in children.

    Mother of a 'Monster'|Jeannette Halton-Tiggs, Mansfield Frazier|January 10, 2011|DAILY BEAST
  • At their best, these hosts are self-described entertainers, occasional provocateurs, and early-warning systems.

    Running Away From Rush|Matt Latimer|October 27, 2009|DAILY BEAST
  • Early voting is the early-warning system as the hurricane is coming,” he says, “and this year it looks like a category 5.

    Has Obama Already Won?|Will Doig|October 29, 2008|DAILY BEAST