The siren network in Lincolnshire, which was the subject of criticism during recent floods, is to be tested.
The system, believed to be the largest in the country, is made up of 40 flood warning sirens situated along the coastline and six at inland areas.
Some residents in Louth complained the sirens were sounded too late while in the village of Wainfleet it failed completely and needed a mobile unit.
The system will be tested on 15 August, weeks earlier than normal.
Many siren networks across the country have been dismantled as other forms of alert, like fax and email, have become more common.
But a spokesman for Lincolnshire County Council said the system was still a valuable tool.
"Clear advance warnings combined with effective flood protection schemes can reduce the impact of flooding," he said.
"This siren system is a testament to the ongoing commitment of Lincolnshire County Council to community safety in Lincolnshire."