A Flood Alert was issued for Tidal Fal Estuary in Cornwall on 18th May 2026. Affected watercourses included the South Cornwall Coast, Tidal Fal Estuary.
During this event, FloodRadar monitoring gauges recorded notable rises. The South Cornwall Coast at Truro Harbour rose 3.01m, peaking at 2.52m, while the Carnon River at Bissoe climbed 0.32m.
Environment Agency advice issued
High tides this evening may lead to flooding. Flooding is possible from 17:00 to 21:00 on Monday. Areas particularly at risk include low lying areas in Falmouth, Penryn, Flushing, Mylor Bridge, the A39 at Perranarworthal, Devoran, Calenick, Truro and the A390 at Tresillian. The high tide at Falmouth on Monday is at 19:13, times of high water will vary along the coast. Forecast total high tide level is 2.51mAOD. Expect tide levels along the coast to be between 0.2 and 0.3 metres above tide table level. Strong Force 5 Southerly winds and offshore wave heights of over 1.3m are forecast over the
Monitoring gauges during this event
| Station | River | Rise | Peak |
|---|---|---|---|
| Truro Harbour | South Cornwall Coast | +3.01m | 2.52m |
| Bissoe | Carnon River | +0.32m | 0.69m |
| Boscadjack | River Cober | +0.16m | 0.49m |
| Trenear | River Cober | +0.15m | 0.54m |
| Truro | River Kenwyn | +0.14m | 0.28m |
| Ponsanooth | River Kennall | +0.10m | 0.15m |
| Bolingey Cocks Bridge | Bolingey Stream | +0.09m | 0.35m |
| Idless Dam | River Allen | +0.08m | 0.17m |
| Penryn Trelawney Park | Praze Stream | +0.06m | -12.99m |