Although named storms are more commonly associated with the colder months of autumn and winter are typically more ferocious than those in the summer as the wind speeds are usually higher, summer storms do occur and can be just as impactful, according to the Met Office.
As such, any given bout of wind or rain is going to cause a lot more problems in the summer than it would in the winter when people are more likely to stay indoors and watch TV than climb into a canoe or go camping.
Trees in full leaf
“High winds, for instance, pose greater risks in summer due to the presence of temporary structures like festival tents, more people camping or travelling, and trees in full leaf, with the possibility of fallen branches and leaves blocking drains.”
“When heavy rain falls on the very dry soils we have after an extended period of dry weather, then it is likely to run off enhancing the likelihood of flash flooding. However, river levels are typically lower at this time of year, reducing the chances of flood risk. With Floris the weather warnings are for wind rather than rain, although heavy rain is also expected,” Professor Gray said.
Lightning
The warm, moisture-heavy air is also the reason why summer storms are more likely to contain lightning than winter storms, according to the National Severe Storms Laboratory (NSSL) in the US.
These then heat and expand the surrounding air to produce thunder. Only about 10 percent of lightning flashes reach the ground; the rest are discharged from cloud to cloud, the NSSL says.
“We understand how tempting it can be to stick with summer plans—whether it’s a coastal walk, a camping trip, or a garden gathering—but Storm Floris presents real risks. With strong winds and heavy rain forecast, we’re urging everyone to take the yellow warning seriously.
Wind surfers have been out on the water during Storm Floris as the Met Office warned of danger to life from large waves (Photo: Charles McQuillan/Getty)
The Met Office adapted an impact-based warning system in 2011 to reflect the fact that summer storms can have a disproportionate effect on people. This means that warnings are issued based on the potential impacts of the weather rather than specific weather “thresholds”.
For example, strong winds in winter may not warrant a warning, but the same winds in summer, when people are camping, could lead to a warning due to the higher risk of impact, the Met Office says.
Storm Floris is an unusually strong storm for the time of year, with only two amber wind warnings having previously been issued in August since the Met Office introduced its impact-based warnings in 2011.
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