Earlier today the area affected was the extreme west of West Sussex but this has recently been extended to cover all of the South.of England.
The UK Met Office has issued a less sever status yellow snow warning for Northern Ireland from 6pm on Wednesday until 6am on Thursday.
Persistent, heavy snow is expected with travel delays possible on some roads.
People are also urged to be wary of icy roads and pavements, increasing the chances of accidents or injuries. Thus, weather warning has been issued for many parts of United Kingdom, particularly over Northern Ireland, Scotland and Northern England.
Snowfalls of up to 20cms can be expected on higher ground, with deposits of up to 8cms likely in more populated areas.
The spokesperson said: "Very strong winds will affect parts of the United Kingdom during Wednesday night and into Thursday".
The Met Office said: "This evening will see further heavy snow showers, giving further moderate falls in places".More news: BU Study: Repeated Head Hits, Not Concussions, Cause CTE
More news: Brigitte Bardot slams 'hypocritical and ridiculous' #MeToo movement
More news: Ford plans more SUVs, fewer cars, aims to pay billions to shareholders
"Over the hills, snow will drift in the strong to gale force winds".
Gritters were out in force across Scotland, with pictures on social media showing particularly hard driving conditions on the M8 near Easterhouse.
"Here, there is potential for disruption to power supplies from frequent lightning strikes".
The national forecaster warned with the widespread winter showers there would be "some accumulations of snow" in places.
It's being blamed on a low pressure system crossing the country overnight on Wednesday, adding that "isolated more exposed areas" would see 80mph winds but 60-70mph would be more likely for most. Delays or cancellations are possible to rail and air travel.
Overnight and into Tuesday morning snow will continue to fall in north west England, Scotland and Wales while chilly downpours soak southern England.
3-8 cm of fresh snow is likely to accumulate widely with up to 20 cm over high ground.
A second weather warning is also in place for Wednesday evening through until the morning of Thursday 18th January, with strong winds set to affect large parts of the UK.