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Would that be the upper/mid level low that has been hanging around FL all week perhaps building down to the surface? It has been a persistent little devil.
Looking at the 500 mb vort of the GFS long range it appears to me to be the low pressure system that is currently over the western U.S. as it moves eastward through the end of the week and off the coast next week in association with a frontal system expected to move over Tennessee . I wouldn't put much stock in this yet though as development has been inconsistent from model run to model run.
(Forecasts based solely on long range model projections belong in the Forecast Lounge and not on the Main Page Talkback article.)
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