A yellow alert of snow issued by the Met Office has now been updated to include a warning for ice.

Rain is set to sweep across south west Hertfordshire this morning and could turn to snow in some places.

A spokesman said: "There is a chance of snow settling with disruption to road, rail and air services as well as interruptions to power supplies and other utilities.

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"Associated heavy rain and strong winds may prove additional hazards.

"As skies clear on Thursday night there is also potential for widespread ice to form quite rapidly on untreated surfaces.

"This is an update to slightly increase the risk of disruption from snow, as well as to introduce ice as a hazard."

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The yellow warning is now in place from 10am until 11.55pm, The Met Office's chief forecaster said: "As a developing area of low pressure moves east across southern Britain on Thursday there is potential for rain to turn rapidly to snow as cold air is drawn in.

"However, there is a great deal of uncertainty over the track and intensity of this system, meaning that confidence is low in the amount and extent of any snow."