The National Centre for Hydro-Meteorological Forecasting said tidal levels at Hon Dau monitoring station in Hai Phong could reach 3.85-3.9 metres, with peak tides expected between 7 am and 10 am.
Tidal levels along the northern coast are expected to remain high over the following 24-48 hours before gradually declining. Peak levels at Hon Dau could fall to 3.8-3.85 metres.
Hydrologists warned that low-lying coastal and riverside communities, particularly areas outside flood protection dykes, could experience flooding during the morning high tides.
Elevated tides could also slow floodwater drainage from rivers and increase saltwater intrusion into inland areas.
Strong offshore currents during the afternoon ebb tide could pose dangers to shipping and beachgoers, particularly near harbour entrances and beaches.
The Vietnam Disaster and Dyke Management Authority under the Ministry of Agriculture and Environment has urged affected localities to closely monitor forecasts and issue timely warnings to residents.
Authorities have been asked to inspect vulnerable coastal communities, dykes, reservoirs and flood-prone areas, and prepare evacuation plans where necessary.
Local agencies should also clear waterways, address infrastructure problems promptly and prepare drainage measures to protect agricultural production and urban areas.
Aquaculture facilities should be reinforced, crops ready for harvest collected, and waterway operators warned of potential flooding to ensure the safety of people, vessels and equipment.
According to the weather agency, the highest tidal level recorded at Hon Dau station on November 1 was 3.93 metres at 8.40 am, with water levels remaining elevated and changing slowly.
