But many more would have died if not for a tsunami warning from the Japanese Meteorological Agency.

VOA: special.2011.06.07

If one or more of the warning signs are present, a doctor should examine you immediately.

VOA: special.2010.07.06

But if violations continue, an official warning could follow, and eventually a recommendation to declassify the site.

VOA: standard.2010.08.05

It is not as if warning flags had not been raised elsewhere.

FORBES: And Deliver Us From Systemic Risk: The Fed Transcripts

He explained that it takes about 20 hours for such an EMP to reach Earth from the sun, giving us a window to react and prepare if the warning is timely enough.

FORBES: Huge Solar Flares Could Spell Catastrophe for Earth

From May 2011, every website must post a warning if they want to put cookies on a computer.

BBC: Beware the cookie monster: a new law aims to protect privacy