Rescue workers are evacuating homes and ordering residents to move families, pets and valuables to a safe place.
When the water level rises fall, residents in west Wales have been told to turn off gas, electricity and water and put flood protection in place.
The firefighters and rescue tried hard to pump water from the area built into efforts to reduce the water level.
Dozens of roads have been closed and police guards are in place because worse weather is expected to hit the country.
Milford Haven Docks "did everything they could to lower the water level" according to the police.
People have been warned to avoid the Milford Haven Lower Priory area while the emergency crew evacuates.
The Met Office has issued a yellow weather warning for wind and rain as it kicked at 1pm on Friday and lasted until midnight, with up to 50mm of rain and winds up to 60mph expected.
Warning and severe flood warnings have been implemented in the south and west of Wales.
A McDonald's drive through has been described as resembling a lake in Haverfordwest and water consuming fast food restaurants.
Wales Natural Resources has issued 10 flood warnings.
Flood warning means possible flooding and residents must be prepared.
NRW said residents had to prepare a flood package of essential items, and monitor local water levels and flood estimates.
The chaos of the flood came as Britons prepared for a non-stop thunderstorm for three days when the Meteorological Office issued a flood warning for the upcoming "Storm Deirdre".
England is set for travel and flood chaos as strong winds and rain are ready to attack.
Heavy rain is being controlled by a strong low pressure system circling the Atlantic.
Tropical air entering the supercharged jet stream will see temperatures rise dramatically and lead to "convective" rain for the next two days.
So far, this is a flood warning in place:
Towy is lower
River downstream of the downstream catchment of Llandeilo except Llandeilo.
North and West Pembrokeshire
Rivers on the north and west coasts of Pembrokeshire.
Rivers in Gwendraeth Fach and Gwendraeth Fawr catchments.
River in the south of Pembrokeshire.
River in Cleddau Barat catchment.
River downstream of Teifi downstream Llanybydder.
Sungai Taf and Cynin
The river was caught by Taf and Cynin.
Between St. Dogmaels, Cardigan and Amroth.
Between Pendine and Hendy, east of Llanelli.
The tidal area at Crofty
North Gower Coast at Crofty
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