Sunday will be very cold with sunny spells and wintry showers of rain, hail, sleet and snow with a risk of thunder.
"Ice will also be a hazard overnight into Sunday morning and then is expected to return in the evening".
Wednesday morning will be wet with rain and sleet, heavy at times.
"This will result in falling temperatures and icy patches are likely to develop on some untreated surfaces, especially where any wintry showers lead to wash off of previous treatment".
"For a time most of this going through Saturday night into the start of Sunday leaves behind a legacy of icy patches, so you will have to look out for those first thing Sunday".
The Met Office's chief forecaster also said some roads and railways are likely to be affected with longer journey times by road, bus and train services.
The east will be brighter but it will be cold too, with temperatures only hitting a maximum of 5C.
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"Highest temperature of just 2 to 6C with moderate to fresh westerly winds".
'It's going to feel very cold for all of us.
Public Health England forecasters have extended a cold weather health alert until Tuesday.
"The showers will be most frequent in the west and north and will become more isolated this afternoon". Highest temperatures of 4 to 7 degrees.
Showers and blustery weather is forecast for the north-west, where the highest temperatures us expected to be around 5C, with the south-west's at about 7C.
Rain and hill snow is expected to arrive tonight, turning increasingly to snow at lower levels.