As the skies of Leeds were flooded with an enormous explosion sound, hundreds of people have taken to social media to try to work out what the noise was.
Don't worry, the skies aren't caving in and it's not a bomb - just a VERY loud thunderclap after a lightning flash. Here's what you've been saying about the 'loudest thunder ever heard in Leeds':
After weeks battling snow, Leeds is now being plagued by a new foe: thunder and rain!
Here's the Met Office forecast for the rest of Wednesday:
5pm-8pm Heavy rain
11pm Heavy rain
A dry and fine morning with long sunny spells after an early frost. Sunshine turning a little hazier through the afternoon, but staying mostly dry with light winds. Maximum temperature 10 °C.
What causes Thunder?
Thunder is the sound caused by lightning.
Depending on the distance and nature of the lightning, it can range from a sharp, loud crack to a long, low rumble (brontide).
The sudden increase in pressure and temperature from lightning produces rapid expansion of the air surrounding and within a bolt of lightning.