Flood Alert Issued for Lower River Ems Affecting Hampshire and West Sussex

Alert Details

The Environment Agency has issued a Flood Alert (Severity Level 3) for the Lower River Ems. The alert was officially raised at 10:04 AM on February 21, 2026, following weeks of heavy rainfall that have left the river levels significantly elevated.

Affected Areas

The alert covers the Solent and South Downs region, specifically impacting Hampshire and West Sussex. Areas currently experiencing minor flood impacts include fields, Brook Meadows, rural roads, and gardens along the River Ems. Residents in Westbourne and Emsworth are advised to stay vigilant.

What You Should Do

Residents in Westbourne and Emsworth should consider activating any flood protection products they may have. Because flooding may occur quickly, it is important to monitor local conditions closely. The Environment Agency is currently monitoring the situation, operating the structure at Constant Springs, and clearing debris screens to maintain flow.

Expected Conditions

The River Ems is currently high. While only a minimal rise is expected Saturday evening following light rain (less than 5mm), Sunday’s forecast remains uncertain. A probable scenario of less than 10mm of rain would cause river levels to rise by 10cm, likely flooding more gardens. A less likely but possible scenario of 20mm of rain could result in isolated property flooding.

Timeline

The alert is effective immediately, with river levels expected to remain higher than normal for several weeks. Potential property flooding could begin as early as 10:00 AM on February 22, 2026. Unsettled weather may continue throughout February, posing further risks. This alert is scheduled to be updated by 20:00 on February 22, 2026.