Here is the SPS on the gravity wave-
Special Weather Statement
National Weather Service Mount Holly NJ
932 AM EDT Mon Apr 13 2020
NJZ001-007>010-PAZ054-055-060>062-101>103-105-131545-
Sussex-Warren-Morris-Hunterdon-Somerset-Carbon-Monroe-Berks-
Lehigh-Northampton-Western Chester-Eastern Chester-
Western Montgomery-Upper Bucks-
Including the cities of Newton, Washington, Morristown,
Flemington, Somerville, Jim Thorpe, Stroudsburg, Reading,
Allentown, Bethlehem, Easton, Honey Brook, Oxford, West Chester,
Kennett Square, Collegeville, Pottstown, Chalfont, and Perkasie
932 AM EDT Mon Apr 13 2020
...Brief period of damaging wind gusts possible late this
morning...
Several surface observations from central Pennsylvania have
indicated a one-to-two hour period of wind gusts between 40 and 70
mph. These stronger winds have reached the southern Poconos and
Lehigh Valley. Wind gusts may reach 60 mph in eastern Pennsylvania
and northern New Jersey through midday. Tree damage and power
outages may occur with these stronger wind gusts.