The A12 at Blythburgh in Suffolk is closed in both directions due to flooding between the B1125 and the A145.
The sea wall has been breached and emergency repairs will be carried out at low tide.
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It will be sunny and hot in places on Saturday. Sunday will be cooler with showers later.
For some parts of the region, there's a risk of thunderstorms tonight before a mainly fine weekend.
Suffolk fire crews and care home managers have been practicing a major fire at a nursing home near Bury St Edmunds.