Having seen how quickly a storm can move in on a normally gorgeous day, we now close up our 18' awning on our TT. We also retract it when we go to bed if it is calling for rain or light winds.
Last year while camping it was a beautiful 30C day. We went for a hike outside the CG. We looked over towards the CG at one point and saw a small dark cloud. Not thinking it was anything to worry about we carried on. Anyway, when we returned we had a surprise. A rather quick, intense storm was in the centre of that small cloud. There were tables turned, branches down and we counted 7 destroyed awnings just coming into the park.
If you leave, take a few minutes and save yourself not only money but a spoilt holiday.