A Flood Alert was issued for Langstone to Emsworth Harbour in Hampshire, West Sussex on 25th October 2026. Affected watercourses included the Langstone Harbour, Emsworth Harbour.
During this event, FloodRadar monitoring gauges recorded notable rises. The Tide at Portsmouth rose 4.21m, peaking at 2.42m, while the Hermitage Stream at Havant climbed 0.41m.
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. Levels will be high at South Street and Queen Street Emsworth. The Ship Inn car park, Langstone will flood. Water will flow across the A259 junction with Lumley Road, flooding driveways. Water will flow into the road at Langstone High Street. Flood depths in the road will be up to 0.1m deep, and should only
Monitoring gauges during this event
| Station | River | Rise | Peak |
|---|---|---|---|
| Portsmouth | Tide | +4.21m | 2.42m |
| Havant | Hermitage Stream | +0.41m | 5.49m |
| Denmead | River Wallington | +0.37m | 33.71m |
| Crosslands Drive | River Lavant | +0.36m | 0.49m |
| Emsworth | West Brook | +0.34m | 2.09m |
| Chichester Tozer Way | River Lavant | +0.24m | 12.86m |
| West Street | River Lavant | +0.18m | 7.22m |
| Westbourne | River Ems | +0.06m | 0.13m |