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Wednesday, October 7, 2020 Convective Potential


weatherwiz
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A vigorous s/w trough with attendant cold front is expected to sweep across New England Wednesday. Ahead of this feature, surface temperatures should warm into the 60's to even lower 70's. While dewpoints will be modest (generally in the 50's) sufficient moisture should be available as evident by PWAT values ranging between 0.80'' - 1.00''. A pocket of unseasonably cold air aloft in the mid-levels moving through will result in a plume of steep lapse rates passing overhead. This, combined with surface temperatures into the 60's to lower 70's with modest dewpoints should result in MLCAPE values on order of 250-500 J/KG. This feature will also be associated with rather strong wind shear, characterized by a 500mb jet max of 100+ knots with a low-level jet of 30-40+ knots. This will result in sufficient shear to assist with storm formation and storm organization. 

Multiple short-line segments are likely to develop Wednesday afternoon as this feature propagates across New England. Combination of strong shear aloft, steep lapse rates, inverted-V profiles, and potential for strong mixing will result in the potential for damaging wind gusts. If stronger convection can materialize, small hail would become a possibility. The greatest potential is from north-central NY through central New England where the best overlap of ingredients look to exist.

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