A yellow weather warning issued by the Met Office has been upgraded to the more serious rating of amber.
The warning is still yellow until 3pm today but then becomes amber until 6am tomorrow.
Heavy snow is forecast throughout today and tomorrow.
Another yellow warning is in place between 6am and 9pm tomorrow.
The Met Office says high ground may see snow accumulations of 20- to 40 cm in places, with drifting and blizzard conditions due to the strong to gale force southeasterly winds.
At lower levels, 10 to 15 cm of snow is likely in places.
It says the public should be aware of the potential for severe disruption to transport and to power supplies.
Heavy snow is being forecast for throughout today and temperatures are not expected to reach above 0 degrees celsius.
More heavy snow is being predicted for tomorrow morning, becoming lighter in the afternooon and evening but with temperatures ranging between -1 and -2.
Sunday is expected to be cloudy but more light snow is being forecast on Sunday night, Monday and Tuesday,
The weather has caused delays on some of the road with Metro warning passengers to expect delays to all services, with some staying on main roads only if unable to access minor roads due to weather.
You have been sending in your pictures of the disruption via Twitter.
The above was submitted by Sean Liquorish who gave a push to some of the struggling drivers this morning on Law Lane, Southowram.
@Berniejames7 also sent in the view from her window looking over Sunnybank Road leading up Sunnybank Grange, Brighouse.
Calderdale Highways has also confirmed that with more snow forecast gritters will continue treating roads as long as necessary until fully safe and passable.
Calderdale Council has also warned that household waste collections could be delayed by at least 2 hours with possible cancellations.
Police are urging drivers to only take to the roads if necessary and to expect delays if they do.
Sergeant Andy Barron, from the Western Area Roads Policing Team, said anyone getting in their cars should make sure they have warm clothing with them, a spade and a fully charged mobile phone.
Send in your snow pictures to firstname.lastname@example.org or via Twitter @Brighouse_Echo or @Echo_Michaela