Travellers have been warned of disruption across Scotland later as Storm Amy is set to hit parts of the country with winds of up to 100mph in some exposed areas.

Two amber warnings for high winds have been issued for large parts of north and north western Scotland from 17:00 to 21:00 on Saturday.

A number of ScotRail and ferry services have been cancelled ahead of the storm’s arrival, while some bridges will be closed to high sided vehicles.

A Met Office yellow warning for heavy rain has also been issued for Scotland and Northern Ireland where hundreds of schools closed early ahead of the storm’s arrival.

Amy, the first named storm of the season, could bring peak wind speeds of 70mph across many places in the amber warning zone.

For more exposed areas, particularly around Tiree, western Lochaber and Skye, gusts of up to 100mph could occur for a time this evening.

A wider yellow warning for winds to up to 60mph – and up to 70mph in exposed areas – covers all of Scotland.

From midnight the amber wind warning area is more focused on the most northerly areas but will extend eastwards into some parts of Aberdeenshire.

The Forth Road Bridge has now been closed to all vehicles while the Clackmannanshire Bridge, Kincardine Bridge and A1 Tyne Bridge in East Lothian are expected to be closed for high-sided vehicles.

Transport company Bear Scotland said it hoped the Queensferry crossing would remain open to cars thanks to its wind shielding, but it may close for high-sided vehicles later in the evening.

ScotRail is cancelling a number of services in the north of the country from 18:00, with speed restrictions also in force on all routes

Scotland’s transport secretary, Fiona Hyslop, asked people to check before they travel.

She said: “We are urging people planning to travel on trains, ferries and flights to contact their operators to find out if their service is affected.

“Motorists will face difficult driving conditions, so it’s vital people plan ahead if they have to travel to see if their route is impacted by the weather.”

Transport disruption:

• The following train services are cancelled from 18:00. Mallaig – Fort William, Fort William – Crianlarich, Crianlarich – Oban, Inverness – Aberdeen, Inverness – Wick / Thurso, Inverness – Kyle of Lochalsh, Perth – Inverness.
• Other routes may also be affected and speed restrictions will be in force from 18:00.
• Traffic at the Rest and Be Thankful in Argyll has been diverted on to the Old Military Road. Traffic Scotland said it was monitoring conditions.
• Delays and cancellations expected on CalMac’s west coast ferry network. It has asked passengers to check its website for updates.
• Some ferry crossings between Cairnryan and Northern Ireland have been cancelled since 12:00.
• Forth Road Bridge has close to all vehicles, while other bridges may have restrictions on high-sided vehicles.

Police Scotland said a number of ferry crossings between Cairnryan, in Dumfries and Galloway, and Northern Ireland would be cancelled from 12:00.

The force advised those booked onto affected sailings not to travel to the area as long delays are expected.

Officers also said customers should check with Stena Line and P&O Ferries for updates.

Freight drivers are encouraged to contact port authorities for more information.

Network Rail said its specialist weather team would be closely monitoring the storm’s path and working with ScotRail to confirm the routes are most likely to be impacted.

David Ross, ScotRail chef operating officer, said many services in the north of the country would be severely impacted by the conditions.

He also warned problems may continue into the weekend due to trains being out of position and potential debris on the line.

Mr Ross told BBC Radio’s Good Morning Scotland: “We find that during disruption, it is very difficult to secure replacement buses late on in the day when we have severe weather and severe wind.

“Colleagues will be out inspecting the tracks, they’ll be doing visual inspections from the air and if we find there are a significant number of trees down, that might take a bit longer to get services back up and running.”

He told the programme that passengers with pre-booked tickets for Friday could also use them on Saturday and Sunday.

Police Scotland’s Ch Supt Scott McCarren, head of road policing, said drivers should drive to the conditions and be aware of increased stopping distances.

Motoring organisation the AA also urged drivers to avoid taking risks.

The AA’s Shaun Jones said: “Storm Amy is shaping up to be a serious weather event, and we’re already seeing signs of disruption.”

Traffic Scotland operator manager Douglas Cairns urged anyone planning to travel to consider whether their journey was “absolutely necessary”.

He told Good Morning Scotland: “It comes down to that personal choice, whether you think it is safe, if you are competent and you’re not putting yourself and others at risk while you are travelling.

“If you are travelling, make sure you have sufficient equipment such as a warm jacket, you have food, your mobile phone is topped up with charge and that your vehicle is able to travel in the conditions.”

Power firm SSEN has issued its own yellow alert.

It said text messages were being sent to more than 180,000 of its more vulnerable customers, giving them help and advice in the event they lose power.

The United Rugby Championship (URC) fixture between Edinburgh and Ulster, which had been due to take place on Friday evening, has been postponed due to the adverse conditions.

The junior and mini Great Scottish Run in Glasgow on Saturday have been cancelled due to the weather warning.

Organisers said the strong winds and rain would create a risk of debris for the Glasgow Green events, which also included a toddler dash.