Flood Warning & Alert Types

 
ImageLevelNameMeaning
1Severe Flood WarningSevere Flooding, Danger to Life.
2Flood WarningFlooding is Expected, Immediate Action Required.
3Flood AlertFlooding is Possible, Be Prepared.
4Warning no Longer in ForceThe warning is no longer in force
*Sources updated daily from the Environment Agency's API: https://environment.data.gov.uk/flood-monitoring/id/floods.

Flood level warnings are categorised in severity by a numbering system as shown in the table above. The highest type of flood alert is 1, whereas the lowest type of flood notice is 4.

Flood Alerts, Warnings & Notices - 01 May, 2025

3


Greater London, Hammersmith and Fulham, Hounslow, Richmond upon Thames, Wandsworth Tidal Thames riverside from Putney Bridge to Teddington Weir

4


West Sussex Climping Seafront

4


City of Bristol, North Somerset, South Gloucestershire Tidal River Avon at Bristol, Pill and Shirehampton

4


Lancashire, Westmorland and Furness Coast at North Morecambe Bay

4


North Lincolnshire River Trent at Alkborough Flats

3


Hertfordshire Groundwater flooding in Flamstead

3


Hertfordshire Groundwater flooding in Kimpton and Lilley Bottom

3


Buckinghamshire, Oxfordshire Groundwater flooding in the Henley and Assendon area

3


Hertfordshire River Mimram in Hertfordshire
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