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4Warning no Longer in ForceThe warning is no longer in force

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 - 18 Mar, 2026



4


Reading, West Berkshire, Wokingham
River Kennet from Thatcham down to Reading

3


Gloucestershire, Oxfordshire
River Windrush from Bourton to Newbridge

3


Dorset Council, Hampshire, Wiltshire
Groundwater flooding in the Cranborne Chase area

4


Buckinghamshire, Hertfordshire, Oxfordshire
River Thame, Horsenden Stream and Chalgrove Brook

3


Oxfordshire, West Berkshire
River Pang from East Ilsley to Pangbourne and Sulham Brook

3


Bournemouth, Christchurch and Poole, Dorset Council, Hampshire
Lower Avon and tributaries

3


Dorset Council
Groundwater flooding in the West of Dorset

4


Dorset Council
Groundwater flooding for the Iwerne

2


Dorset Council
Groundwater flooding for the South Winterbourne Valley

4


Dorset Council
Groundwater flooding for the Piddle Valley

3


Gloucestershire
River Coln and its tributaries

3


Hampshire, Wiltshire
Groundwater flooding in the Salisbury Plain area

3


Swindon, West Berkshire, Wiltshire
River Kennet and its tributaries from Berwick Bassett down to Newbury

3


Hampshire, West Sussex
Groundwater flooding in Finchdean, Dean Lane End and Rowlands Castle

2


Wiltshire
Groundwater flooding for the Wylye Valley at Warminster

2


Wiltshire
Groundwater flooding for the Till

2


Wiltshire
Groundwater flooding for the Wylye Valley

3


West Sussex
Groundwater flooding in West Dean, Singleton, Charlton, East Dean and Chilgrove

3


Hampshire
Groundwater flooding in Hambledon

2


Wiltshire
Groundwater flooding for the Wylye Valley at Wilton

3


West Sussex
Groundwater flooding in upper River Ems Valley

4


Dorset Council
Groundwater flooding for the North Winterborne, north of the A354

2


Hampshire, Wiltshire
Groundwater flooding in the Bourne Valley - The Winterbournes

3


Hampshire
Groundwater flooding in Bramdean and Cheriton

3


Hampshire
Groundwater flooding in Hursley

3


Hampshire
Groundwater flooding in Twyford and Hensting

3


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

3


Hampshire, Wiltshire
Groundwater flooding in Pitton, West Tytherley, Nether Wallop and Broughton

3


Hampshire
Groundwater flooding in the Candovers and Old Alresford

3


Oxfordshire, West Berkshire
Groundwater flooding in the Lambourn Valley catchment

3


Hampshire
Groundwater flooding in the Alton area

3


Hampshire, Wiltshire
Groundwater flooding in villages surrounding Andover

3


Kent
Groundwater flooding in East Kent

3


West Berkshire
Groundwater flooding in the Great Shefford area

3


Wiltshire
Groundwater flooding in the Upper Aldbourne Valley

3


Hampshire
Groundwater flooding in Bishops Sutton

3


Hampshire
Groundwater flooding in Deane and Ashe in North Hampshire

4


Hampshire
Groundwater flooding in Denmead

3


West Berkshire
Groundwater flooding in West Ilsley, East Ilsley, Compton, Chilton and West Hagbourne
BSI Membership Badge - Flood Dr
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