An impressive video has emerged of huge black storm clouds covering the sky above Cookstown in Norther Ireland, UK on May 13.

"It's been a quiet year for weather here in N. Ireland but now the atmosphere is changing in the form of increasingly unstable air, we have gone from two weeks of sun and high pressure suddenly to low pressure with wind, showers, hail and thunder," the filmer said.

It's been a quiet year for weather here in N. Ireland but now the atmosphere is changing in the form of increasingly unstable air, we have gone from two weeks of sun and high pressure suddenly to low pressure with wind, showers, hail and thunder. This was a squall line on a cold front passing over Cookstown in Co, Tyrone bringing torrential rain and blustery winds, a gust front feature can be seen passing over the houses, filmed with DSLR with 10mm lens,.