Comrie residents are being warned to prepare for the possibility of more flooding misery on Thursday.
Public services say residents there and in Bridge of Earn should prepared for high levels of rain.
Tayside Fire and Rescue, Tayside Police, Perth & Kinross Council and SEPA are monitoring river levels and have teams on standby in case of flooding.
Current forecasts suggest that river levels may peak in Comrie mid-morning on Thursday and in Bridge of Earn 10-15 hours later.
Residents are being advised to sign up for flood alerts at www.sepa.org.uk/flooding
The warnings come after Comrie suffered its second serious bout of flooding of the year on Monday, and as the authorities issue more general warnings of severe weather in many parts of the country.
The Met Office and police are warning the public and motorists to prepare for potential travel disruption across much of Scotland on Thursday, especially during the morning rush hour.
An amber (Be Prepared) warning for heavy rain has been issued for Strathclyde, Dumfries & Galloway, Stirling, Perth and Kinross and Southern Highlands during the early hours of Thursday and will sweep across parts of the country throughout the morning.
The heaviest rain is expected to fall over high ground in Dumfries & Galloway, Argyll, the southern Highlands, Stirling and west Tayside ““ many of the same areas that were affected earlier this week by heavy rain. Southerly gale force winds will accompany the rain, and gusts of up to 60 miles per hour are possible in some areas.
A separate yellow (Be Aware) warning has been issued covering most of the rest of Scotland except Orkney, Caithness & Sutherland and the north of Grampian.
Transport Minister Keith Brown said: “We have been in regular contact with the Met Office, police, operating companies, the rail industry and other key responders this week. Our Multi Agency Response Team will be fully operational to monitor the network and provide assistance. I would urge the travelling public and motorists to take extra care in areas that experience testing conditions.”
Marc Becker, from the Scottish Environment Protection Agency”s (SEPA) Flood Unit, said: “There are 12 flood alerts in place, covering Argyll and Bute, Ayrshire and Arran, Dumfries and Galloway, Central, Dundee and Angus, Edinburgh and Lothians, Fife, Scottish Borders, Skye and Lochaber, West Central Scotland, Western Isles and Tayside, but we are expecting further alerts to be issued over the next 24 hours.
“To assist with operational responses, SEPA is providing Scotland”s emergency services and other responders with regular updates on forecast, river and coastal flooding and we continue to monitor the situation 24/7.
“Members of the public, in areas which could be affected, are encouraged to remain vigilant and mindful of the conditions in their locality, especially if travelling. Anyone can access the latest flood updates for their area, and sign up to Floodline, our direct warning service, via our website, or by calling 0845 988 1188.”
Full alerts and a map showing the areas included are available at www.metoffice.gov.uk/public/weather/warnings/