Weather News with J7409 Thursday 9/27/18

717 views · Published 27 September 2018 · 7:45 · Indexed 30 October 2026

Channel: J7409 · 2018 · Science & Technology

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Weather News with J7409 9/27/18.
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A few strong to marginally severe storms, capable of isolated damaging winds, will be possible from Georgia to parts of the Mid-Atlantic, primarily this afternoon and evening.

GA to Southeast VA
Early-morning water-vapor imagery suggests a well-defined short-wave trough is approaching the lower MS Valley. This feature is forecast to eject across the TN Valley during the latter half of the period before translating into the northern Middle Atlantic region by 28/12z. In response, a weak surface low is expected to develop along a weak frontal zone over northern AL which should then track across the southern Appalachians into southeast VA overnight. Latest model guidance suggest modest boundary-layer heating will be noted from GA into NC where low-level lapse rates are expected to be relatively steep. Primary large-scale forcing will spread north of the MRGL Risk as negligible height falls are forecast southeast of the higher terrain. As a result, boundary-layer heating will prove instrumental for convective development from GA to NC. Forecast soundings suggest convective temperatures should be breached shortly after 18z and isolated thunderstorms should evolve soon thereafter. Convection that encounters the frontal zone draped across southern VA/northern NC will encounter somewhat greater low-level shear which may encourage a few weak supercells. Primary severe threat is expected to be locally damaging winds with afternoon/evening storms.


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