STORM Goretti is now expected to cause "dangerous" travelling conditions, with the snow warning in Worcestershire now raised to amber.
The Met Office raised the alert from yellow to amber on Wednesday afternoon (January 7), with 10 to 15cm of snow considered to be "likely" in most of the warning area on Thursday evening (January 8).
Most of Worcestershire is now covered by the amber warning, which comes into force from 8pm on Thursday and is due to be lifted by 9am on Friday (January 9).
According to the forecaster, Storm Goretti is now "likely" to lead to disruption and risky travelling conditions.
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It has warned of delays on the roads, which may leave some vehicles and their passengers stranded, as well as delays and cancellations to public transport.
There is also now considered to be a "good chance" of rural communities being cut off, and some areas experiencing power cuts and other service disruption.
"Rain associated with Storm Goretti will turn readily to heavy snow on Thursday evening, initially on hills and then to lower levels overnight, before easing through the course of Friday morning," a spokesperson for the Met Office said.
"Accumulations of 10-15 cm are likely fairly widely, with the potential for 20 to 30 cm in some locations, mainly on hills above 200 meteres elevation, more especially in Wales or the Peak District.
"Snow will ease through the course of Friday morning, turning more to rain or sleet at times at low levels, but disruption is likely to persist into Friday after snow stops falling.
"There is some uncertainty over the exact track of Storm Goretti, which will influence the locations most likely to see disruptive snow, and it is possible this warning may be updated."
The Met Office has also advised against driving during the storm and has urged people to consider alternative forms of transport.
It has also said people should prepare for power cuts by gathering torches, batteries and mobile power packs.