The two flood alerts, meaning “flooding is possible - be prepared", in place around Southampton for Tuesday (Dec 7), for Mansbridge and Riverside Park, and Southampton Water and Hamble, have been updated with increased tide predictions due to storm Storm Barra.
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For Mansbridge and Riverside Park the government’s ‘Check for flooding’ service now says Tuesday’s (Dec 7) tide at 12:41and 14:34 is higher than normal due to unsettled weather.

"Tuesday afternoon's tide at 12:41 and 14:34 on 07/12/2021 is higher than normal due to Storm Barra, which brings strong South Easterly Force 7 winds. The weather increases tide table values by 0.54 m. The forecast tide level has increased since yesterday. The total forecast tide is now 5.26 metres Chart Datum (2.52 mAOD) at Southampton. For 1 hour either side of high water, levels in the lower River Itchen will increase as the incoming tide prevents water from flowing out to sea. Footpath flooding will affect parts of Riverside Park. The pub car park at Mansbridge, is likely to be flooded for a short period of time. The tide will not flood property, but as rain is also expected, some surface water flooding may affect the A27. At 01:18 and 03:18 on 08/12/2021‚ the tide will be slightly lower, but may still cause similar minor impact flooding."

The full advice is here.

The flood alert for Southampton Water and Hamble for Tuesday is here.