A Flood Alert was issued for Fareham to Portchester in Hampshire, Portsmouth on 25th October 2026. Affected watercourses included the Portsmouth Harbour.
During this event, FloodRadar monitoring gauges recorded notable rises. The Tide at Portsmouth rose 4.21m, peaking at 2.42m, while the River Alver at Browndown climbed 0.66m.
Environment Agency advice issued
High tides on Monday may lead to flooding. Flooding is possible for 1 hour either side of Monday morning's tide at 11:00 on 26/10/2026. The weather increases tide table values by 0.44 m. Total forecast tide is 5.37 metres Chart Datum (2.64 mAOD) at Portsmouth. Strong Southerly Force 5 wind. Water may just exceed the top of the main slipway, flooding the road at Lower Quay, Fareham. The lower end of Wallington Shore Road will flood to a depth of 0.1m. Spray overtopping and subsequent debris could affect the A27 at Portchester. Monday's tide at 23:18 26/10/2026 is forecast to be 29 cm lower (2.3
Monitoring gauges during this event
| Station | River | Rise | Peak |
|---|---|---|---|
| Portsmouth | Tide | +4.21m | 2.42m |
| Browndown | River Alver | +0.66m | 1.19m |
| Titchfield Canal | River Meon | +0.65m | 2.20m |
| Titchfield | River Meon | +0.44m | 1.30m |
| Denmead | River Wallington | +0.37m | 33.71m |
| North Fareham weir | River Wallington | +0.22m | 0.47m |
| Wickham | River Meon | +0.10m | 18.71m |