Yes, I had to do a double take when I read bout this too! Then I thought bit more about it. And it is true, I do feel a bit More whenezy with my asthma whe the weather is 'heavy' i.e. just before a thunderstorm! And then I read that Australian researchers had reported that the atmospheric conditions associated with thunderstorms may increase the likelihood of asthma outbreaks.

Using asthma emergency department attendance figures in six towns in southeast Australia, the strongest association was with late spring and summer. At this time of year, the cold air outflows associated with thunderstorms sweep up pollen and other particles, and increase their concentration in a shallow band of air at ground level by 8 to 12 times, leading to an increase in severe asthma attacks.

Well that explains it then!