The phrase "a widespread alert" is correct and usable in written English.
It can be used to describe a notification or warning that is distributed broadly to a large audience or population.
Example: "The government issued a widespread alert about the approaching storm, urging residents to take necessary precautions."
Alternatives: "a broad warning" or "a general alert".
But even many law enforcement officials had overlooked that sighting amid widespread alerts to be on the lookout for a white van or a white box truck seen near several shootings.
The Vatican insists this was to protect the innocent and never intended to encourage what has been established as a widespread failure by church officials to alert police to the criminal abuse of children.
"We are seeing the commercialisation of childhood," grumbles Gary Ruskin, director of Commercial Alert, a Washington lobby group.Advertisers insist that a widespread move to ban children's ads would backfire.
Early this morning we were alerted by our customers that there was a widespread issue affecting our 2006 model Zune 30GB devices (a large number of which are still actively being used).
There is a widespread expectation that the discovery of mutagenic activity in chemical screening programs may alert us not only to mutagenic potential in man, but carcinogenic potential as well.
The absence of conclusive data prevents a conclusion about whether these cases are isolated events or represent a widespread problem, but the cases provide a stimulus for reception countries to be alerted to a possible problem.
He also described a widespread problem of non-black people reporting posts by black people as "hate speech" in alerts to Facebook, when often those posts are "meant to be positive efforts".
Interpol has alerted countries in Europe, Latin America and Asia known to have been targeted - and is carrying out a widespread investigation.
Displacement is a widespread practice.
It is winning a widespread hearing.
