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September Obs 2026


yotaman
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1 hour ago, SEwakenosnowforu said:

Just under 0.50 of rain here last month...nothing this month. What is with all these storms hammering greensboro then falling apart as they approach wake co? It has happend numerous times this summer. It's strange.

Two items

1. Thunderstorms require a source of lift to form.  The western piedmont trough is such a source, which is why many times cell pop-up there first.

2. Thunderstorms are by nature self-limiting as the downdraft from the rain chokes of the convective updraft.  There must be some mechanism to separate the downdraft from the updraft for a system to last.  One example is shear.

In a stagnant dynamic environment, which is very common in this area in late summer, it is common for cells to pop off the piedmont trough but then die quickly without any mechanism to keep them going.

That's not the whole story, but it's definitely a major part.

Some of it is also just bad luck.

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