Activity slowed down in May with fewer tornadoes overall spread out over a much larger area due to less favorable conditions. The air became somewhat more stable and wind shear decreased, despite the large number of storms that tracked across the US. Since then, activity has been generally fairly low, with no major outbreaks anywhere in the summer of 2006, although the actual number of tornadoes has been moderate. However, in Canada a series of strong low pressure systems, combined with high heat and humidity had led to numerous severe weather events across the country with several tornadoes occurring in the Prairies, in Ontario and Quebec.