Wednesday features yet another day of high heat and humidity for many, however, this time that energy is liable to be utilized as a weak surface trough/associated surface low pressure track from north-central NY through north-central New England. The combination of temperatures ranging from upper 80's to mid 90's and dewpoints pushing lower 70's will contribute to a moderate unstable airmass with MLCAPE values likely exceeding 1500-2000 J/KG despite poor mid-level lapse rates. Forecast models also indicate a belt of 50+ knots at 500mb traversing portions of the region with 25-30+ knots of low-level shear.
Scattered-to-numerous thunderstorms should begin to rapidly fire by mid-to-late afternoon with activity quickly converging into multiple line segments. Wind shear is more than sufficient for activity to quickly organize into multiple lines. Combination of strong wind shear, moderate instability, and very steep low-level lapse rates will bring about the potential for damaging wind gusts, including a swath of widespread damaging wind gusts. Large CAPE, especially in the hail growth zone, will also bring about the potential for large hail, especially early on in storm mode. This will also contribute to vivid/frequent cloud-to-ground lightning. A tornado or two is also possible...especially along any llvl convergence zones. PWATS > 1.50'' suggest the potential for poor drainage flash flooding.
Thursday also has potential but tomorrow will play a factor into that.