Hoteliers say that guests have left a Pembrokeshire resort because of fears that the storm will cause further damage overnight.
"We've had a few guests who were due to stay the weekend and they've seen the weather forecast."They decided not to stay another night and booked out to go home early."
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Organisers say there will be increased security at the Urdd National Eisteddfod, which began in Bridgend today.
Any remaining heavy or thundery showers will clear eastwards this evening.
Over 70 firefighters are currently tackling the fire, which is now confirmed to be at a scrap yard.