Storm Event

High tides and storm surge cause flooding on the south coast

Severity ? 3

Source

The storm began to form over the central North Atlantic in the wake of another low-pressure system situated over the British Isles on 19th December. While interacting with the second anticyclone, this storm moved eastwards overnight reaching southern England with a central air pressure of approximately 970 mbar, generating south-westerly winds over the English Channel.

Within the national tide gauge network, there were no observations of notable high water levels, although a skew surge value of up to 0.6 m was recorded at Newlyn on the south coast. There are no water level observations available from within the Solent, which is where the impacts of this event are concentrated.

We are unaware of any sources describing the wave conditions during this event.

Pathway

The sea wall at Ryde was breached over a length of approximately 60 ft. [18 m]. We are unaware of any further specific information concerning the flood pathways during this event.

Receptor and Consequence

The unusual movement of this storm and its interaction with another anticyclone meant that flooding happened over several days. On 19th December there was localised flooding in Hythe, Hampshire (Ruocco et al., 2011). A “large” number of locations were impacted on 20th December (Met Office, 1983; Eden, 2008). Many local roads and properties in low-lying areas of Portsmouth were inundated, including the A27 nearby Emsworth (Ruocco et al. 2011). The flooding in Cowes was described as the worst in a number of years, and 20 properties were inundated. In Ryde, damages totalling many thousand pounds were incurred as large section of the sea wall was breached, along with many flooded properties. Other impacted locations included Hythe and Fareham, and also Hayling Island where some residents were trapped in their homes.

Cornwall Council (2011) describe an event which occurred during an unspecified time in December 1983; associated with flooding in Penzance, Fowey and Looe (Cornwall Council, 2011). We determined that this event is very likely to have occurred on the 20th December 1983; as the 20th saw the largest water level in December, and it was only during the 18th-20th that saw significant surge activity recorded at Newlyn tide gauge during that month.

References

  1. Met Office, 1983. Monthly Weather Report of the Meteorological Office. Monthly Weather Report, 100(12). Available at: http://www.metoffice.gov.uk/learning/library/archive-hidden-treasures/monthly-weather-report-1980s
  2. Eden, P., 2008. Great British Weather Disasters, London: Continuum UK.
  3. Ruocco, A.C. et al. 2011. Reconstructing coastal flood occurrence combining sea level and media sources: a case study of the Solent, UK since 1935. Natural Hazards, 59(3), pp.1773–1796. Available at: http://link.springer.com/10.1007/s11069-011-9868-7 [Accessed March 27, 2015].
  4. Cornwall Council, 2011. Preliminary Flood Risk Assessment ANNEX 5 – Chronology of Major Flood Events in Cornwall, Truro
  5. Cornwall Council, 2011. Preliminary Flood Risk Assessment ANNEX 5 – Chronology of Major Flood Events in Cornwall, Truro