A severe flood Warning will remain in force for two hours following the time of high tide at Preston Beach in Weymouth.
Flooding may already be affecting properties, low lying areas and roads.
There may be significant spray and shingle overtopping affecting the coast road which will be very dangerous to life, property and traffic.
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The High Court has agreed to a Sussex Police request for access to footage of the Shoreham air crash, but has rejected two other requests.
Wednesday's weather for the east of the region
Wednesday's weather for the west of the region