Strengthening low pressure moved across Ontario into Quebec province during the afternoon of March 20th. This storm developed a strong low-level jet (5000-6000 ft) of 50-60+ knots across the region. In addition, a strong cold front moved across an unseasonably mild air mass to develop scattered showers and low-topped thunderstorms.
The updrafts of some of these thunderstorms reached vertically enough to tap into the low-level jet allowing for isolated damaging wind gusts.

Thunderstorm Wind in ST. LAWRENCE, NEW YORK
From 20-MAR-20 13:30:00 to 20-MAR-20 13:30:00 (EST-5)
Location: EDWARDS
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Convective winds downed several trees and power lines.

Thunderstorm Wind in ST. LAWRENCE, NEW YORK
From 20-MAR-20 13:35:00 to 20-MAR-20 13:35:00 (EST-5)
Location: ROOSEVELTOWN
Magnitude: 60.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Public

Convective winds downed several trees, snapped a few and damaged a wooden shed.

Thunderstorm Wind in ST. LAWRENCE, NEW YORK
From 20-MAR-20 13:38:00 to 20-MAR-20 13:38:00 (EST-5)
Location: STARLAKE
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Convective winds downed several trees and power lines.

Thunderstorm Wind in ST. LAWRENCE, NEW YORK
From 20-MAR-20 13:34:00 to 20-MAR-20 13:34:00 (EST-5)
Location: POTSDAM
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Convective winds downed several trees and power lines.

Thunderstorm Wind in ST. LAWRENCE, NEW YORK
From 20-MAR-20 13:10:00 to 20-MAR-20 13:10:00 (EST-5)
Location: EDWARDSVILLE
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Measured wind gust of 59 mph.

Thunderstorm Wind in ST. LAWRENCE, NEW YORK
From 20-MAR-20 13:25:00 to 20-MAR-20 13:25:00 (EST-5)
Location: (MSS)RICHARDS FLD MA
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Measured wind gust of 59 mph.

Thunderstorm Wind in FRANKLIN, NEW YORK
From 20-MAR-20 13:45:00 to 20-MAR-20 13:45:00 (EST-5)
Location: FT COVINGTON
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Convective winds downed several trees on Dundee road.

Thunderstorm Wind in FRANKLIN, NEW YORK
From 20-MAR-20 14:01:00 to 20-MAR-20 14:01:00 (EST-5)
Location: DUANE CENTER
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Convective winds downed several trees and power lines.

Thunderstorm Wind in FRANKLIN, NEW YORK
From 20-MAR-20 14:05:00 to 20-MAR-20 14:05:00 (EST-5)
Location: FAUST
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Convective winds downed trees and utility lines.

Thunderstorm Wind in CLINTON, NEW YORK
From 20-MAR-20 14:12:00 to 20-MAR-20 14:12:00 (EST-5)
Location: ELLENBURG DEPOT
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Convective winds downed trees onto a car.

Thunderstorm Wind in CLINTON, NEW YORK
From 20-MAR-20 14:18:00 to 20-MAR-20 14:18:00 (EST-5)
Location: RIVERVIEW
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Convective winds downed approximately 12 trees.

Thunderstorm Wind in CLINTON, NEW YORK
From 20-MAR-20 14:30:00 to 20-MAR-20 14:30:00 (EST-5)
Location: PEASLEEVILLE
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Convective winds downed trees and utility lines.

Thunderstorm Wind in ESSEX, NEW YORK
From 20-MAR-20 14:30:00 to 20-MAR-20 14:30:00 (EST-5)
Location: NEWCOMB
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Convective winds downed trees and utility lines.

Thunderstorm Wind in ESSEX, NEW YORK
From 20-MAR-20 14:54:00 to 20-MAR-20 14:54:00 (EST-5)
Location: SEVERANCE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Convective winds downed trees and utility lines.