6 DETAIL II: Spelling Use the spell-checker on your computer, but remember that it will fail to distinguish "their" from "there", "form" from "from", "its" from "it's", and many more. Watch out particularly for "effect" and "affect", "principle" and "principal", "dependent" and...
known as Shortwaves. The chart above also shows how, locally, the jet stream can split in two around a so-called cut-off upper high or low, reuniting again downstream. Longwaves, shortwaves and cut-off highs and lows all have a strong bearing on the weather to be expected at ground-...