Storm surge last Thursday on the east coast

[Sentinel]

Last Thursday - 19th November - we experienced a massive storm surge around the east coast of England. It was one of the highest tides ever seen in Southend where I live and flooded some lower level marshes and came onto the quay at Leigh-on-Sea. But the thing is, the surge seemed to come out of nowhere. The pressure in the area was 1029 and fortunately it was a very calm day, had it been windy or gale force like it was a few weeks ago it would have caused severe flooding with loss of life. But the question is, how did it happen? I didn't get a text alert about it until 10am on the day and high tide was at 1507 so where did it come from and what caused it?