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4Warning no Longer in ForceThe warning is no longer in force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 - 02 Apr, 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


Devon North Devon coast from Hartland Point to Lynmouth

4


Halton, Warrington Mersey Estuary at Warrington

4


Lancashire, Westmorland and Furness Coast at North Morecambe Bay

4


Cumberland Coast from Gretna to Silloth

4


Lancashire Wyre estuary from Fleetwood and Knott End to Little Eccleston

3


East Riding of Yorkshire North Sea coast at Withernsea, Easington and Kilnsea

4


Gloucestershire Severn estuary from Gloucester to Sharpness

4


Gloucestershire Wye Estuary in Gloucestershire

4


Somerset Somerset coast at Porlock Weir

2


North Lincolnshire River Trent at Alkborough Flats

3


Devon, Torbay South Devon coast from Start Point to Dawlish Warren

3


West Berkshire River Lambourn and its tributaries from Upper Lambourn down to Newbury

3


Hampshire, Wiltshire Groundwater flooding in the Salisbury Plain area

3


West Berkshire Groundwater flooding in the Great Shefford area

3


Oxfordshire, West Berkshire Groundwater flooding in the Lambourn Valley catchment

3


Hampshire Groundwater flooding in the Candovers and Old Alresford

3


Hertfordshire Groundwater flooding in Flamstead

3


Hertfordshire Groundwater flooding in Kimpton and Lilley Bottom

3


West Berkshire Groundwater flooding in West Ilsley, East Ilsley, Compton, Chilton and West Hagbourne

3


Hampshire Groundwater flooding in Deane and Ashe in North Hampshire

3


Buckinghamshire, Oxfordshire Groundwater flooding in the Henley and Assendon area

3


Hertfordshire River Mimram in Hertfordshire

3


West Berkshire Groundwater flooding in the Leckhampstead area
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