Storm surges

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  • A Storm Surge is a change in sea level caused by intense low pressure and high wind speeds.
    • Storm Surges
      • The low pressure at the center of the storm 'pulls' the water level up.
        • Whether an area is at low tide or high tide can significantly determine whether an area gets flooded or not.
      • For every drop in air pressure by 10mb (millibars), the sea level rises by 10cm.
      • During a tropical cyclone, the air pressure may be 100mb lower than normal, which will raise the sea level by 1 meter.
      • Storm surges intensify at a funnel-shaped coastline due to the volume of water being forced into a smaller volume. (also topography effect)
      • Whether an area is at low tide or high tide can significantly determine whether an area gets flooded or not.
      • 5th December 2013, low pressure passed over the top of north Scotland,  causing temporary rise in sea level in the North Sea.
        • The low pressure then moved southwards, causing the sea levels to rise on the east coast of the UK, creating large waves. Many areas that experienced high tide at the time were flooded.

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