A massive smoke haze from a wildfire led to ships on the River Clyde sounding their foghorns on Monday.
The fumes from the fire near Inverkip in Inverclyde drifted over Greenock, causing low visibility.
Social media reports indicated that ships issued warning blasts due to the haze.
A spokesperson for Peel Ports Clydeport clarified that there was no specific request for sound signals, but vessels are required under the International Collision regulations to operate their foghorns in areas of restricted visibility, reports the BBC.
This incident coincides with the Scottish Fire and Rescue Service (SFRS) extending its "extreme" wildfire warning across parts of Scotland until Thursday.
However, a "very high" warning has been extended for all of Scotland until Wednesday, with an "extreme" risk specifically in the southwest, eastern, central, and northern areas until Thursday.
A large blaze erupted in the Glen Trool area of the Galloway Forest Park on Thursday, spreading to Loch Doon in East Ayrshire.
At its peak, two fire engines and two helicopters were deployed to water-bomb the fire.
The blaze was brought under control by Monday night, with one fire crew remaining at the scene to inspect the area and ensure its safety.
The public was urged to stay away due to heavy smoke in the area.
The warm and dry weather is expected to persist until the weekend, with temperatures reaching as high as 20C.
Kenny Barbour, deputy assistant chief officer from SFRS, said the recent fires were "devastating for those who live nearby".
He said to the BBC: "Our firefighters will continue to work with local landowners and other partners to bring these fires under control.
"As the warm and dry weather continues, so too does the risk of wildfire, and so we are asking the public to exercise extreme caution and think twice before using anything involving a naked flame.
"Responsible human behaviour can significantly lower the chance of a wildfire starting, so it is crucial that people act safely in rural environments and always follow the Scottish Outdoor Access Code."
John McKenzie, Scottish secretary of the Fire Brigades Union, said the recent fires were the "clearest evidence" of the need to invest more in staffing, equipment, and training to prevent wildfires and protect firefighters and communities.
He added: "However, over the last 12 years, over 1250 firefighter posts have been lost and tens of millions of pounds have been cut from the Scottish Fire and Rescue Service budget.
"The Scottish Government must provide urgently required additional funding to ensure that firefighters can tackle incidents such as wildfire effectively."
But Community Safety Minister Siobhian Brown said this year's Scottish Government Budget included £412.2m for the SFRS – an increase of £18.8m.
She said: "This will enable SFRS to continue to deliver the high standard of services required to keep communities safe and ensures Scotland continues to have more firefighters per capita than other parts of the UK.
"I am grateful to the dedicated firefighters and first responders who have been dealing with recent and ongoing wildfires.
"We will continue to work with SFRS to support implementation of its three-year wildfire strategy, with the continued rollout this year of new equipment, vehicles, and Personal Protective Equipment (PPE)."
