Hi Yagan
Last school holidays we were camping at St Helen's and the wind picked up to gusts of 100km+ and thought our lifestyle CT was going to tip over. If you have all the anchor points pegged down and guy ropes attached you will be surprised what they can withstand. Congratulations for the new addition to your family and if any thing like my kids they will more than likely sleep through it all.
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Ahh St Helens on a windy day, if you survived that any in the country will be a piece of cake
We survived a Storm while camped at St Helens, 120nott winds coming from the sea, blew every pop top off every poptop van in the van park, we thought we were going to be blown 5k inland the wind was so strong, didn't sleep well that night.
My tip is just go, on 99.9% of times it only lasts a day and just because it windy at home, doesn't mean it windy where your going.
A tip if you are camped and the wind picks up and you have the awning out, either pull it down or make in fully enclosed to reduce the flapping, check all the ground pegs and loose items(storm flaps and so on.
Baz.