Most of us have come to think of convective activity in terms of relatively short-lived time scales. An air mass thunderstorm, for example, we learn lasts about an hour from start (the cumulus stage) to finish (the downdraft stage). Multicell and supercell thunderstorm systems can take an entire day to run their life cycles. But one type of convection can regenerate over a period of days, making flight planning problematic—especially if the routes call for night flying.
展开▼
