Powys is bracing itself for more snow following last night's sharp temperature drop.

According to the Met Office, their weather station in Sennybridge observed temperatures as low as -9 degrees Celsius during the night and early hours of this morning (Thursday).

While the Storey Arms on the A470 near Brecon had been blanketed in snow since last week, other areas of Powys are now facing the same cold weather and adverse conditions.

Dyfed-Powys Police has said the A4059 Storey Arms to Penderyn road is "particularly icy" about three miles from Penderyn but is "not blocked at this time".

The Met Office has now updated its weather warning for some areas from a yellow weather warning, the least severe, to an amber warning, intermediate severity, for snow and ice.

Areas which are covered by the amber weather warning include the Storey Arms, on the road to Merthyr Tydfil through the Brecon Beacons National Park, and the Crickhowell area.

The rest of Powys is still covered by the yellow warning which covers all of Wales, as well as most of the UK, yesterday which is set to last until tomorrow afternoon.

More deep temperature plunges have been predicted in areas like Presteigne which is expecting to dip to -6? along with Sennybridge and Llandrindod Wells which are expected to drop to -5?.

According to the Met Office at the time of writing, Brecon, Builth Wells, Llandrindod Wells, Llanwrtyd, Sennybridge, Rhayader, Talgarth, Presteigne, Knighton and Hay-on-Wye will all experience snow today and tomorrow.

Crickhowell has a 95% chance, according to the Met Office, of heavy snow from 2pm today until around 8am tomorrow.

The Storey Arms – which is popular in snowy weather and the summer – has a 90% chance of heavy snow from 3pm today until roughly 3am tomorrow with more gentle snow showers to follow.

The snow can be seen building at the Storey Arms from the Traffic Wales’ road CCTV cameras on the Traffic Wales website.

The car park opposite the outdoor centre has been full with people looking to experience the snow.

The adverse weather conditions has caused the Royal Welsh Agricultural Society's new Demonstration and Innovation day to be postponed.

Sponsored by the society along with the Council for Awards of Royal Agricultural Societies (CARAS), the one-day event was due to take place on Friday, February 1 to showcase some of the latest technologies to members of the agricultural, forestry and horticulture communities.

An event spokesman said: "Due to the inclement weather we are already experiencing and the weather warnings in place for the next 48 hours, we have taken the hard decision to postpone tomorrows Demonstration and Innovation Day.

"CARAS Wales and the Royal Welsh Agricultural Society are sorry for any disappointment or inconvenience caused, but the safety of visitors, exhibitors and guests is our greatest priority.

"We will aim to reschedule the event and will publish the new date shortly."

The Mid and West Wales Fire and Rescue Service is reminding motorists to stay safe if they're driving in adverse weather conditions.

The fire service released a short video, which can be seen below, on their Facebook page with the advice.

Dyfed-Powys Police have also warned drivers to be prepared for driving in the icy conditions.

They tweeted: “Winter driving - be prepared. Plan your journey and let someone know your journey and ETA.”

They said to make sure the vehicle is prepared with topped-up windscreen wash, tyres in good condition, a working mobile phone and anti-freeze.

They also said to make sure the car battery is healthy, to plan any journeys and to try to stick to major roads which are more likely to have been gritted.

The police have said they are preparing for the snow which is set to affect Carmarthenshire, Ceredigion, and Pembrokeshire as well as Powys.

The force said it is expecting an increase in the number of calls it receives for assistance and so officers are asking the public to manage the number of calls they put out.

Head of specialist operations, Superintendent Craig Templeton said: “We have been busy planning for the adverse weather so we can continue to serve our communities in the way they expect.

“To help us do this, we are asking the public to consider their options before contacting us, as in some cases, other organisations may be better placed to help you.

“For example, if you are calling about a tree or power/telephone pole that is down you should only call us to report this if there is a significant risk to others, or there has been a collision and someone is injured - in this case call 999.

“Please only call police about weather related issues, including road closures, if it is urgent.”

The police also advised that residents can call the power cuts or damaged lines service on 105, the Openreach Damage Reports service on 0800 023 2023, Powys County Council on 01597 826000 and Traffic Wales on 0300 123 1213.

Powys County Council have said that waste collection could be disrupted by the wintry conditions.

A council spokesman said: “Recycling and refuse collections across the county are being disrupted due to the current weather conditions.

“We will try to catch up on any missed collections when conditions improve. Thank you for your patience.”

Meanwhile bus companies such as the N.A.T. Group and Stagecoach Wales, who work with TrawsCymru to provide the T6 bus service to Swansea and the T4 bus service from Newtown to Cardiff, have told commuters to expect delays and keep an eye on their Twitter accounts for updates.

Transport for Wales, which replaced Arriva Trains Wales, has warned of various train cancellations and alterations potentially effecting passengers at stations such as Llandrindod Wells, Knighton, Knucklas, Dolau, Llangammarch Wells and Cynghordy to name a few.

All train users are advised to check the status of their trains before setting-off using the train company's journey checker.

Homeless charities, such as the mid Wales based charity Helping Our Homeless Wales, are reminding people to be mindful of the homeless and those living in poverty during the harsh weather.

Helping Our Homeless Wales, which now has coat rails in Brecon, Llandrindod Wells and Newtown for those who want to donate a coat or who can't afford to buy one, posted the rough sleeper helpline phone number for the UK charity Homeless Link – 0800 970 2304.

Residents who are concerned about rough sleepers in their area can contact the charity Street Link which will locate them and direct help to them from the local authority or outreach service.

The cold snap has not affected local schools and and all the roads remain open in Breconshire and Radnorshire at the time of writing.

For updates on road conditions and closures, visit the Traffic Wales website.