SPC Day 2
...Northeast...
Moderate destabilization near and south of the surface warm front,
combined with veering wind profiles with 35-50 kt of effective
shear, will result in a conditionally favorable environment for
supercells across much of central/eastern PA/NY and northern NJ by
Sunday afternoon. However, substantial uncertainty remains regarding
storm coverage across the region with the most favorable
environment. Large-scale ascent associated with the departing
shortwave trough is expected to primarily remain north of the
international border, with a capping inversion around 700 mb
potentially limiting deep convection across much of the warm sector.
At least isolated thunderstorm development will be possible along an
eastward-moving surface trough Sunday afternoon. All hazards would
be possible with any sustained deep convection. A Slight Risk has
been introduced from northeast PA into central NY, where confidence
in storm coverage is somewhat greater due to potentially stronger
heating and instability compared to areas further north and east.