Hi could someone explain the difference between them and why a trough forms from a weakening trowal.
I understand a trowal as a trough of warm air aloft (I used to know the term occluded front, cold front catching up to a warm front in a system) and trough as a elongated area of low pressure. I've seen multiple times a trowal line turning into a trough line on the GFA. See linked files. Could someone explain the meteorology behind this?
thanks ollie
GFA - Trough (Purple lines) vs trowal line
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GFA - Trough (Purple lines) vs trowal line
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- trough.png (358.38 KiB) Viewed 1006 times
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- Trowal.png (359.02 KiB) Viewed 1006 times
Re: GFA - Trough (Purple lines) vs trowal line
DId you hear the one about the jurisprudence fetishist? He got off on a technicality.
Re: GFA - Trough (Purple lines) vs trowal line
I will have a guess: it’s marked as an occluded front (trowal) for as long as it’s associated with an adjoining warm/cold frontal system. Once the warm and cold fronts have dissipated, what’s left is noted as a trough rather than a front.
DId you hear the one about the jurisprudence fetishist? He got off on a technicality.
