Motorists are facing difficult driving conditions in parts of the country as snow causes travel disruption, while there were also reports of “thundersnow” in some areas.
The Queensferry Crossing was closed to vehicles in both directions due to the weather, including falling ice and snow, while in the North East police warned of dangerous driving conditions on the A93 and the B993.
Rail passengers are also affected, with ScotRail warning of “significant disruption to services on multiple routes” due to heavy snow.
Meanwhile, some people contacted police to raise concerns after they heard strange noises amid stormy weather.
Police Scotland Control Rooms tweeted at around 5am on Friday: “We have received a number of calls regarding people concerned about explosions heard.
“Please do not be alarmed, we are currently experiencing thunder and lightning.”
Many people took to social media to describe the noises they heard with many in the Edinburgh area saying the sounds woke them up.
Edinpotter63 tweeted: “Good morning from snowy Edinburgh. Woken up at 4.40 by thundersnow!”, while Dr Bryony Coombs @BryonyCoombs tweeted: “Good morning to everyone in #Edinburgh who woke in the middle of the night to huge crashes of thunder, lightning and snow… #thundersnow.”
When thunderstorms form in wintry conditions they can sometimes give rise to heavy downpours of snow, which along with the usual thunder and lightning, is called “thundersnow”, according to the Met Office website.
If it happens at night the lightning appears brighter because the light reflects off the snowflakes, however the snow contained in the thunderstorm dampens the sound of the thunder.
While thunder from a typical thunderstorm may be heard from many miles away, during a thundersnow event the thunder will only be heard if you are within two to three miles of the lightning.
The Met Office has issued yellow warnings of snow for much of the country, which are valid until 9am on Friday.
It states: “The bulk of snow accumulations will be over hills and mountains. 2-5cm of snow is possible above 150m, with transient sleet/snow at lower elevations.
“Steadily increasing amounts are likely at higher levels; perhaps as much as 10-20cm above 400m, significantly affecting higher transport routes for a time before it turns to rain.”
Police in Ayrshire tweeted that many roads in the area are affected by snow and urged people to take extra care.
Elsewhere, Police Scotland reported that the A70 Lanark Road West, just after Balerno, is closed due to an articulated lorry stuck due to weather.
In the Highlands, wintry weather affected several routes and 13 schools were closed.
Diversions for the Queensferry Crossing were put in place via the A985 Kincardine Bridge and it reopened shortly after 9am.
Chris Tracey, Bear Scotland’s south east unit bridges manager, said: “The safety of bridge users comes first and we therefore made the decision to temporarily close the Queensferry Crossing when we identified a risk of falling ice.
“We constantly monitor conditions on the Queensferry Crossing in real time using a bespoke system of weather sensors on the towers and deck.
“At 4.30am, this system reported conditions conducive for ice formation. Patrol staff observed ice falling from the bridge towers shortly after this and the bridge was closed at 4.45am.
“The risk of falling ice has now passed and it is safe to reopen the bridge. We apologise for any inconvenience caused to road users by this closure.”