A Flood Alert was issued for Portsmouth in Portsmouth between 26th and 28th October 2026. Affected watercourses included the The Solent, Portsmouth Harbour, Langstone Harbour.
During this event, FloodRadar monitoring gauges recorded notable rises. The Tide at Portsmouth rose 4.60m, peaking at 2.54m, while the River Alver at Browndown climbed 1.46m.
Environment Agency advice issued
There is no longer a threat of flooding, though standing water and debris may still remain. Coastal conditions are expected to improve and no flooding is expected. We will continue to monitor the situation and work with emergency services and local authorities. Stay away from floodwater - it contains hidden dangers such as open manhole covers, sewage and chemicals.
Monitoring gauges during this event
| Station | River | Rise | Peak |
|---|---|---|---|
| Portsmouth | Tide | +4.60m | 2.54m |
| Browndown | River Alver | +1.46m | 1.21m |
| Emsworth | West Brook | +0.40m | 2.16m |
| Denmead | River Wallington | +0.31m | 33.60m |
| North Fareham weir | River Wallington | +0.31m | 0.47m |
| Havant | Hermitage Stream | +0.20m | 5.28m |
| Crosslands Drive | River Lavant | +0.18m | 0.30m |
| Westbourne | River Ems | +0.06m | 0.11m |