Scattered showers and storms developed in a warm, humid airmass with moderate CAPE and shear ahead of an approaching cold front on September 15, 2021. One particularly strong storm produced widespread wind damage in Centre County, with isolated reports of wind damage elsewhere.  Another storm brought flash flooding to Sullivan County near LaPorte.

Thunderstorm Wind in CENTRE, PENNSYLVANIA
From 15-SEP-21 13:00:00 to 15-SEP-21 13:00:00 (EST-5)
Location: COLEVILLE
Magnitude: 52.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A severe thunderstorm producing winds estimated near 60 mph knocked down trees on Hillary Road in Spring Township.

Flash Flood in SULLIVAN, PENNSYLVANIA
From 15-SEP-21 15:50:00 to 15-SEP-21 18:15:00 (EST-5)
Location: NORDMONT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Muncy Creek jumped its banks and flooded across Nordmont Road.   Conklin Run was also out of its banks and flowing over Lake Road.

Thunderstorm Wind in CENTRE, PENNSYLVANIA
From 15-SEP-21 13:00:00 to 15-SEP-21 13:00:00 (EST-5)
Location: COLEVILLE
Magnitude: 52.00 EG
Property damage: 4.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A severe thunderstorm producing winds estimated near 60 mph knocked down trees and wires in Bellefonte.

Thunderstorm Wind in SULLIVAN, PENNSYLVANIA
From 15-SEP-21 13:00:00 to 15-SEP-21 13:00:00 (EST-5)
Location: EAGLES MERE
Magnitude: 52.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A severe thunderstorm producing winds estimated near 60 mph knocked down trees onto Worlds End Road west of Eagles Mere.

Thunderstorm Wind in CENTRE, PENNSYLVANIA
From 15-SEP-21 13:34:00 to 15-SEP-21 13:34:00 (EST-5)
Location: LIVONIA
Magnitude: 52.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A severe thunderstorm producing winds estimated near 60 mph knocked down a tree onto wires, starting a fire near Livonia in Miles Township.

Thunderstorm Wind in NORTHUMBERLAND, PENNSYLVANIA
From 15-SEP-21 14:30:00 to 15-SEP-21 14:30:00 (EST-5)
Location: EAST LEWISBURG
Magnitude: 52.00 EG
Property damage: 4.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A severe thunderstorm producing winds estimated near 60 mph knocked down multiple trees near the intersection of Route 45 and Route 405.

Thunderstorm Wind in MONTOUR, PENNSYLVANIA
From 15-SEP-21 14:45:00 to 15-SEP-21 14:45:00 (EST-5)
Location: LIMESTONEVILLE
Magnitude: 52.00 EG
Property damage: 4.00K
Crop damage: 0.00K
Reported by: Public

A severe thunderstorm producing winds estimated near 60 mph knocked down trees and wires in the Limestone area.

Thunderstorm Wind in SCHUYLKILL, PENNSYLVANIA
From 15-SEP-21 17:27:00 to 15-SEP-21 17:27:00 (EST-5)
Location: DETURKSVILLE
Magnitude: 52.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A severe thunderstorm producing winds estimated near 60 mph knocked down produced multiple reports of trees and wires down in Pine Grove and Washington townships.

Thunderstorm Wind in MIFFLIN, PENNSYLVANIA
From 15-SEP-21 14:50:00 to 15-SEP-21 14:50:00 (EST-5)
Location: BURNHAM ARPT
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A severe thunderstorm producing winds estimated near 60 mph knocked down trees in the vicinity of Decatur.

Thunderstorm Wind in CENTRE, PENNSYLVANIA
From 15-SEP-21 12:57:00 to 15-SEP-21 12:57:00 (EST-5)
Location: WOODYCREST
Magnitude: 52.00 EG
Property damage: 4.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A severe thunderstorm producing winds estimated near 60 mph knocked down wires in the RV lots on the Penn State campus.