Most of us are familiar with the old saw, Red sky in the morning sailors take warning, red sky at night sailors delight (or some variation). We can read clouds to forecast weather, and we can use things like halos around the moon or sun. I have received another type of predictor that is at least a curiosity.
I was presented with a small branch or twig of a balsam tree and was told it was a good weather predictor. I followed the instructions and hung it on my deck where I could see the predictor (It was called the Maine Woodsman's weather forecaster). And yes it responded to the weather. If it was rainy it would point down and if it was clear weather it would point up. These up/down swings were quite obvious. From my observations, I think it responds to the current weather rather than predict new weather. I still don't have enough data to say if it could actually predict the weather.
Since I have received this Maine weather device, I have noted that other evergreen trees like blue spruce, green spruce, and black spruce all have their branches curled upward in fair weather and down in bad weather.
My question, how do trees respond to high or low pressure and do these trees actually predict weather? I thought it may be related to humidity but was told that the humidity inside the tree is always 100%. Some call it the electrostatic life force. It seems to be pressure related but I do not know the mechanism of response. It also works in winter and summer weather. As it is the season we put up trees to decorate in our homes, I thought this may give CR4 a fun debate and help us to understand this phenomenon. Who knows if we will need it out camping or hiking.
"Almost" Good Answers: