Doomsday Checker
Enter a UK postcode to explore local geography, hypothetical disruption scenarios and practical emergency preparedness information.
About Doomsday Checker
Doomsday Checker is a free tool for looking up postcode geography and available local hazard information in Great Britain.
Flood and weather checks
Results show river and sea planning zones and nearby flood alerts where covered, alongside regional weather warnings. Check current conditions with the Environment Agency and Met Office.
Area information and preparedness
Compare two postcodes or explore flood zones and weather warning areas.
Area profiles use Postcodes.io for postcode geography and ONS Census 2021 via Nomis for population where covered. The 72-hour walkthrough helps households plan for a hypothetical service disruption.
Published by Doomsday Checker · Updated · Data sources and coverage
Frequently Asked Questions
What does a UK postcode emergency risk checker show?
Enter a postcode in Great Britain to see its location, available flood and weather information, and local infrastructure. Read the flood risk guide.
How does the area risk assessment work?
The screening grade uses mapped river and sea flood zones, nearby flood alerts and regional weather warnings. See how we assess an area.
What does Not Rated mean?
A grade requires usable results from all three checks. Available flood and weather information still appears in the result. See source coverage.
How can I prepare for a service disruption?
Use the UK emergency preparedness checklist to plan for a hypothetical three-day interruption to everyday services. Open the preparedness checklist.