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...Northeast States...
A northern-stream shortwave trough is forecast to progress quickly
eastward/southeastward across the Great Lakes into the Northeast
States on Friday. Strong mid-level flow attendant to this system
will spread eastward just ahead of it while an associated surface
low and cold front also move across the Northeast. Temperatures and
dewpoints ahead of this front are forecast to reach the mid 70s and
upper 50s/low 60s, respectively, resulting in modest instability.
Thunderstorm development is anticipated during the afternoon as the
front interacts with this instability. Low to mid-level flow will
strengthen over the region as the shortwave trough approaches,
contributing to both moderate vertical shear and fast storm motions.
Fast-moving bowing line segments, which may eventually amalgamate
into a coherent convective line, will be the predominant storm mode.
Damaging wind gusts from these bowing segments will be the primary
severe hazard, although some isolated hail may occur, particularly
with any more cellular/discrete storms. Additionally, moderate
veering of the low-level wind profiles will support a low-probably
tornado potential with both discrete development ahead of the line
and line-embedded circulations.