An intense cold front move through central New York and northeast Pennsylvania during the afternoon of the 15th. This front produced a major squall line which eventually evolved into a derecho with estimated wind speeds of up to 115 mph in Wayne County, Pennsylvania. The derecho moved into Sullivan County, New York with winds just shy of 100 mph. Thousands of trees were snapped and uprooted along at least a 35 mile path with many homes damaged from falling trees and high winds.

Thunderstorm Wind in LUZERNE, PENNSYLVANIA
From 15-MAY-18 14:56:00 to 15-MAY-18 14:56:00 (EST-5)
Location: NANTICOKE
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Shingles were blown off of a house.

Thunderstorm Wind in PIKE, PENNSYLVANIA
From 15-MAY-18 15:05:00 to 15-MAY-18 15:05:00 (EST-5)
Location: BUSHKILL
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm winds blew trees down.

Thunderstorm Wind in LACKAWANNA, PENNSYLVANIA
From 15-MAY-18 14:16:00 to 15-MAY-18 14:16:00 (EST-5)
Location: BUSH PATCH
Magnitude: 60.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds blew a roof off a small home.

Thunderstorm Wind in BRADFORD, PENNSYLVANIA
From 15-MAY-18 13:17:00 to 15-MAY-18 13:17:00 (EST-5)
Location: NORTH TOWANDA
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: State Official

Thunderstorm winds blew trees down.

Thunderstorm Wind in BRADFORD, PENNSYLVANIA
From 15-MAY-18 13:25:00 to 15-MAY-18 13:25:00 (EST-5)
Location: NEW ALBANY
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: State Official

Thunderstorm winds blew trees down.

Hail in SUSQUEHANNA, PENNSYLVANIA
From 15-MAY-18 13:30:00 to 15-MAY-18 13:30:00 (EST-5)
Location: DIMOCK
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in SUSQUEHANNA, PENNSYLVANIA
From 15-MAY-18 13:35:00 to 15-MAY-18 13:35:00 (EST-5)
Location: SOUTH MONTROSE
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Thunderstorm winds blew a shed over.

Hail in SUSQUEHANNA, PENNSYLVANIA
From 15-MAY-18 13:36:00 to 15-MAY-18 13:36:00 (EST-5)
Location: GIBSON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Unknown

Thunderstorm Wind in SUSQUEHANNA, PENNSYLVANIA
From 15-MAY-18 13:37:00 to 15-MAY-18 13:37:00 (EST-5)
Location: KINGSLEY
Magnitude: 50.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Social Media

Thunderstorm winds blew pieces of siding off of house. Windows were also broken.

Hail in SUSQUEHANNA, PENNSYLVANIA
From 15-MAY-18 13:46:00 to 15-MAY-18 13:46:00 (EST-5)
Location: HARFORD
Magnitude: 2.75 
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail broke a window in house.

Thunderstorm Wind in SUSQUEHANNA, PENNSYLVANIA
From 15-MAY-18 13:57:00 to 15-MAY-18 13:57:00 (EST-5)
Location: CLIFFORD
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm winds blew trees down.

Tornado in WAYNE, PENNSYLVANIA
From 15-MAY-18 14:05:00 to 15-MAY-18 14:06:00 (EST-5)
Location: PROMPTON
Tornado F-scale: EF1
Property damage: 50.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A weak tornado touched down on the eastern shore of Keen Lake, approximately
120 yards from the coastline.  Most of the damage observed with the tornado was
noted near the touchdown point, where several (mostly) pine trees were snapped
and uprooted.  Damage to homes in the area was also noted, as well as the loss of
gutters and mesh screening for porches.  Minor roof damage was also seen, as
trees were snapped along the path.  A weakly convergent path, and sporadic tree
damage, continued along the tornado's path before lifting in an open field just
under one-quarter of a mile east-southeast of its touchdown point.

Thunderstorm Wind in LACKAWANNA, PENNSYLVANIA
From 15-MAY-18 14:06:00 to 15-MAY-18 14:06:00 (EST-5)
Location: WEST SCRANTON
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: State Official

Thunderstorm winds blew trees down.

Thunderstorm Wind in WAYNE, PENNSYLVANIA
From 15-MAY-18 14:05:00 to 15-MAY-18 14:10:00 (EST-5)
Location: WAYMART
Magnitude: 96.00 EG
Property damage: 100.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Damage was first noted just northwest of Waymart, where several large branches were observed to have snapped in a thicket of mixed hardwood and softwood trees.  Trees continued to be either uprooted or snapped as the line continued moving eastward, with at least sporadic tree damage noted in a one mile wide swath along the damage path. Damage to barns was noted, with at least one poorly attached structure shifted in its entirety on its foundation.  Power poles were snapped, with additional damage done to the roof and/or facade of several buildings.  After producing damage at Prompton State
Park, the Honesdale Golf Club lost 30 trees during the storm.  However, the most
significant damage was noted at a cemetery in Honesdale, where nearly 75 trees
were estimated to have been lost near the end of the microburst.

Hail in LUZERNE, PENNSYLVANIA
From 15-MAY-18 14:10:00 to 15-MAY-18 14:10:00 (EST-5)
Location: LEHMAN
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in LUZERNE, PENNSYLVANIA
From 15-MAY-18 14:10:00 to 15-MAY-18 14:10:00 (EST-5)
Location: SWEET VLY
Magnitude: 50.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Numerous trees blown down at Old Tavern Road along Hunlock  Creek.

Thunderstorm Wind in WAYNE, PENNSYLVANIA
From 15-MAY-18 14:15:00 to 15-MAY-18 14:20:00 (EST-5)
Location: CALKINS
Magnitude: 100.00 EG
Property damage: 100.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Sporadic tree and structural damage from this microburst was first noted near the intersection of Eighmy and Nobles Roads, where a poorly anchored storage building was
overturned by thunderstorm winds.  Additional trees were snapped and uprooted as
the line of thunderstorms continued moving eastward, with several power poles and
powerlines also blown down.  Minor roof damage was noted to several homes, with a
few storage buildings receiving heavy damage.  Wind speeds appeared to intensify
near the Delaware River, where wind swaths of trees were almost completely blown
down along River Road.  Several trees fell on an SUV parked near a home, but
fortunately, no one was in the vehicle.  A report of damage to a school transport
van was also received.

Thunderstorm Wind in LUZERNE, PENNSYLVANIA
From 15-MAY-18 14:16:00 to 15-MAY-18 14:16:00 (EST-5)
Location: NANTICOKE
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds blew trees down.

Thunderstorm Wind in LACKAWANNA, PENNSYLVANIA
From 15-MAY-18 14:17:00 to 15-MAY-18 14:17:00 (EST-5)
Location: ARCHBALD
Magnitude: 50.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: State Official

Thunderstorm winds blew trees down on wires near 800 Hill Street.

Hail in LUZERNE, PENNSYLVANIA
From 15-MAY-18 14:20:00 to 15-MAY-18 14:20:00 (EST-5)
Location: PRINGLE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in LUZERNE, PENNSYLVANIA
From 15-MAY-18 14:21:00 to 15-MAY-18 14:21:00 (EST-5)
Location: WILKES BARRE
Magnitude: 50.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Several dozen trees blown down.

Thunderstorm Wind in LACKAWANNA, PENNSYLVANIA
From 15-MAY-18 14:29:00 to 15-MAY-18 14:29:00 (EST-5)
Location: CLARKS GREEN
Magnitude: 50.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Tree uprooted by thunderstorm winds with a lamp post bent over, and large branches blown down  on Venard Road.

Thunderstorm Wind in LUZERNE, PENNSYLVANIA
From 15-MAY-18 14:29:00 to 15-MAY-18 14:29:00 (EST-5)
Location: DURYEA
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Shingles blown off a house.

Thunderstorm Wind in PIKE, PENNSYLVANIA
From 15-MAY-18 14:29:00 to 15-MAY-18 14:29:00 (EST-5)
Location: ROWLAND
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm winds blew trees down.

Thunderstorm Wind in PIKE, PENNSYLVANIA
From 15-MAY-18 14:30:00 to 15-MAY-18 14:30:00 (EST-5)
Location: LACKAWAXEN
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm winds blew trees down.

Thunderstorm Wind in PIKE, PENNSYLVANIA
From 15-MAY-18 14:35:00 to 15-MAY-18 14:35:00 (EST-5)
Location: SHOHOLA
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm winds blew trees down.