The thing about nature is that it doesn't like an imbalance. After all, the whole point of the fact we have weather is simply because the earth is heated unevenly. If we all had the same amount of sunshine and daylight then, well... we'd be out of a job for a start.
But nature never tires of rebalancing the books in terms of temperatures. It's like an endless to-do list for the weather, but when an extreme occurs, so this in turn kick starts a few things to try to readdress the balance.
This week we have the exceptionally hot air across not just parts of the USA, but Western Europe and the UK as well as parts of Asia. The imbalance was caused in part by a sluggish jet pattern which allowed cutoff upper level lows to push heat North and this in turn brought tropical air into the higher latitudes.
But when you get hot air up near the Arctic, well nature suddenly finds a temperature imbalance. As sure as night follows day, so the jet stream fires up in response to this. When the jet stream fires up, the mobility of mid latitude systems develops and hence we see temperatures fall back to more normal values.
This year has been rather noteworthy of the lack of tropical systems which usually assist in playing a part by becoming extra-tropical and doing the job in firing up the jet stream, but give nature a similar range of scenarios and it will eventually revert to doing what it does best... trying to restore the balance.
If only the same efficiency happened with my to-do list...
METEOROLOGIST : MARSH