Eyewitnesses have told ITV News Central a number of loud explosions could be heard from the fire at G&P batteries in Darlaston, Walsall.
50 firefighters are currently tackling the blaze on Willenhall 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.