Why is everyone hiding today?

Do they know that the weather is going to take a turn for the worse later today, or is just a sigh which says, - ‘oh here we go again, it’s that blipper again!
Top left, Horace is hiding under the maple branches, - top right, Mr Squirrel hiding behind the frame for a Clematis.
Bottom left - a big bird (I think it could be a Merlin) hiding behind the trees, and bottom right, sheep in the undergrowth!