The fire started at a factory on Hampton Park Road in Hereford at around 8am.
Some residents in the nearby area have been evacuated to Hereford Leisure Centre on Holmer Road.
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Slowly brightening up later in the day, with some warm sunny spells possible by evening.
Any mist and low cloud will clear during the morning, leaving bright or sunny spells.
Beginning grey and murky again with extensive low cloud and some patchy rain.