Two weather alerts and a flood warning are in place for Ayrshire until Friday (October 6).
A yellow warning is in place until midnight tonight (Wednesday) for heavy rain, which could cause disruption to public transport and make driving conditions difficult.
A second warning then starts from 3pm on Thursday until midnight on Friday, also for heavy and persistant rain.
The Met Office said: "Locally heavy and persistent rain is expected to develop on Thursday and Friday, this following on from heavy rain across parts of this area on Wednesday.
"For lower-lying and southern parts of the warning area, 25 to 50mm is likely to fall, with 75mm in a few locations."
A flood alert has also been issued by SEPA for Ayrshire and Arran, covering much of the coast and some inland areas.
A SEPA spokesperson said: "A period of heavy and prolonged rain is expected overnight and through much of Wednesday and could cause flooding impacts from rivers and surface water.
"Particularly at risk are urban areas and the transport network. Impacts may include disruption to travel and infrastructure and flooding to properties and businesses."
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