The phrase "alert population" is correct and usable in written English.
It can be used to describe a group of people who are aware and attentive to their surroundings or specific situations.
Example: "In times of crisis, it is essential to have an alert population that can respond quickly to emergencies."
Alternatives: "vigilant community" or "aware populace".
EWS systems are designed and operated to alert the population when an event is in the proximities to immediately make it less vulnerable and trying to anticipate natural events.
Various unexploded gas cylinders and mortars have been found, and are being identified and marked to alert the population.
A heat/health watch warning system to predict oppressive weather conditions and alert the population was developed in a subgroup of cities and information on existing prevention policies and of adaptive strategies was gathered.
Public institutions should generate and distribute scientific, non-biased health information and alert the population about the biased websites and other sources of data gathering and information spreading that are paid by private groups to pursue their commercial interests.
The handling of the information by the politicians is a rather a sensitive point because in addition to considerations on political opportunity and partisan gain, the authorities need to strike a balance between the need to alert the population to avoid undesired and preventable casualties and the cautious behaviour required to prevent panic.
BUENOS AIRES — The Brazilian government said Tuesday that it would accelerate efforts to devise a national system for preventing disasters and alerting the population quickly when they occur, in response to the deadly landslides in the state of Rio de Janeiro last week that killed at least 710 people.
In some developing countries, effective low-tech warning systems employ human observers to alert threatened populations.
The explosions had alerted the population of the town, who started to gather on the pier, but no attempts were made to stop the ships from leaving.
The Weather Bureau sent a mobile weather station to Charleston, South Carolina in order to monitor weather conditions and alert surrounding populations with short-range radio equipment.
