Having been a Mare Watcher at two major breeding facilities in Southern Indiana in my late teens I can honestly say that the information that I am about to share I have seen first hand. I am a believer. 

If you have a mare have you ever noticed that she gets uncomfortble when a storm front is moving in? Has she coliced  or do you have a mare that colics frequently? Have you noticed a corrilation to weather patterns? Think back on it.

There is a theory out there that Mares are more sensitive to weather change and therefore more prone to Colic. This theory is based on a balloon therory. It is believed that the empty mare uterus is like a small balloon. It keeps it's shape due to pressures within and outside of the balloon. However when a storm from comes thru it changes the external pressure on the uterus causing it to have some minor shape changes (perhaps major changes) that can cause general discomfort or pain. The symptoms are those of Colic: Bititng at their sides, Laying down and possibly rolling. However they still have normal gut sounds, normal gum color and capilary refill times. Once the storm system has passed or normalized they usually return to normal function. However by then they have been treated by a vet or at home by just your basic banamine injections and people are relieved that they have been able to avert a bad colic.

I am not sure that this is a valid theory but I have see a connection. 

There is no cure and there is nothing to be done about it. Treating as a colic is really the only treatment there is. It is just interesting food for thought. :) 

Same theory goes for pregnant mares having their babies on stormy nights. the Pressure changes cause labor.