A potent cold front pushed into an unseasonably warm and humid air mass, generating widespread showers and thunderstorms. There was a considerable amount of both low level and deep layer shear, and some of the storms produced damaging winds. A line of convection stalled and trained over Centre, Clinton and Lycoming counties during the late evening hours, producing a swath of 4 to 8 inches of rainfall from just north and west of State College northeastward to near Lock Haven, Jersey Shore and just north of Williamsport. There were numerous road closures due to high water in Patton Township, Centre County and several water rescues were reported along Bald Eagle Creek in Milesburg, Centre County, and across northern Lycoming County and western Sullivan County.

Flash Flood in CENTRE, PENNSYLVANIA
From 20-OCT-16 23:00:00 to 21-OCT-16 07:00:00 (EST-5)
Location: YARNELL
Flood cause: Heavy Rain
Property damage: 5.00M
Crop damage: 0.00K
Reported by: Emergency Manager

Intense heavy rainfall brought flash flooding to Centre County late in the evening on Thursday October 20th, continuing until daybreak on Friday October 21st.  Major damage was reported to parts of the area.
Up to eight inches of rain fell in a short time, resulting in evacuations and rescues in low lying areas that were flooded.  Threats to water supplies, sewage treatment facilities, road washouts and widespread damage to property and infrastructure occurred.
Centre County issued a Disaster Declaration for this flood.  This included the municipalities of Milesburg Borough, Boggs Township (Twp), Spring Twp, Centre Region (State College Borough, Patton Twp, Ferguson Twp, Harris Twp, College Twp and Halfmoon Twp), Union Twp, Liberty Twp, Curtin Twp, Benner Twp and Howard Twp.
The total infrastructure damage as assessed by PEMA and FEMA teams is approximately 2 million dollars.
Over twenty swift water rescue teams (SWRT) responded to the area.
Purdue Mountain Road is closed indefinitely with costly repairs needed to reopen the road.
A bridge on Fariview Road in Boggs Twp was closed due to flood damage.  This resulted in a nine mile detour.
The Julian Pike in Patton Twp required three culvert pipes to be replaced before reopening.
Drytop Road in Boggs Twp was repaved with new culvert pipes installed.
Other major roadways impacted include SR144, SR550, SR150 and Business 322.
PENNDOT claimed at least 150K in damage to roadways.
The Bald Eagle School District was closed on Friday.  Park Forest Middle School in the State College School District was flooded and closed for several days.  An estimated 275K in damages occurred at the school.
The SEDA-COG, Nittany Bald Eagle Railroad, and North Shore Railroad suffered damage from bridge and culverts being washed away.  The estimated costs is 350K with 150K being eligible from claims according to FEMA damage assessment.
There is also an agricultural impact.  The region was in a state declared drought and the soil was not stable.  Widespread severe soil erosion and debris flow was deposited on crops and fields.
See:  http://www.centredaily.com/news/local/community/bald-eagle/article115021138.html .

Flash Flood in SULLIVAN, PENNSYLVANIA
From 21-OCT-16 00:00:00 to 21-OCT-16 07:00:00 (EST-5)
Location: HILLSGROVE
Flood cause: Heavy Rain
Property damage: 7.00M
Crop damage: 0.00K
Reported by: Emergency Manager

During the early morning hours of October 21st a frontal system brought intense rainfall which led to flash flooding in part of Sullivan County.   Over eight inches of rain fell across the headwaters of Mill Creek, Elk Creek and the Hoagland Branch.
The storm damage occurred in three townships, Hillsgrove, Elkland and Fox.
The flash floods destroyed three primary residences and 14 seasonal structures.
State Route 87 remains closed until a bridge can be replaced.   The bridge goes over Mill Creek at Hillsgrove, one of the major highways used in the County.
Elk Creek Road is closed due to a bridge washout.
Hoagland Branch Road is closed due to inaccessibility over a 2.5 mile stretch of roadway.   The road is closed between Elk Creek Road to about three miles north.  Several cabins are now isolated. Damages to this road alone are estimated to cost over one million dollars.
The bridge over State Route 4001 (Elk Creek Road) needs to be repaired (early 2017 completion target).
State Route 4010 (Hoppestown Road) is closed with repairs anticipated to be completed by the end of the year.
Emergency management estimated the damage for public assistance is over two million dollars.  Damage to state forest and PENNDOT roads and bridges is even greater.
Flood and debris damage at junction of small streams into Hoagland Branch, Elk Creek and Mill Creeks in the western townships of Sullivan County was as follows:  Fox Twp $1,383,748; Elkland Twp $234,434.00; Hillsgrove Twp $294,927.87.
Primary Residence damage (3 buildings) $399,100.00.
Seasonal Residence damage (14 structures) $620,000.00.
The Sullivan County Rural Electric Co-op lost numerous poles and lines.  Repair costs estimated at $90,000.00.

Flash Flood in LYCOMING, PENNSYLVANIA
From 21-OCT-16 00:00:00 to 21-OCT-16 07:00:00 (EST-5)
Location: BODINES
Flood cause: Heavy Rain
Property damage: 26.00M
Crop damage: 445.00K
Reported by: Emergency Manager

Heavy rainfall brought flash flooding to parts of Lycoming County during the early morning hours of Friday, October 21st.  The Loyalsock and Lycoming Creek watersheds were most heavily impacted.  The flooding destroyed or seriously damaged multiple State and local roads and bridges.   Over twenty primary residence homes were either destroyed or sustained major damage.   Many camps and seasonal homes were also damaged or destroyed along Pleasant Stream, Wallis Run and Slacks Run.
An 8 ���inch liquid petroleum line was also damaged along the Loyalsock Creek and posed a significant environmental impact.
Multiple state and municipal roads and bridges were impacted.  For several days after the rain McIntyre, Gamble and Cascade Townships had locally isolated areas with long delays or limited access.  Many of these roads have undergone at least temporary repairs.
Wallis Run Road, Field Station Road, Upper Bodines Roads are temporarily closed with detours.  At least three state bridges were destroyed and awaiting repair.
A historic municipal stone arch bridge over Pleasant Stream in McIntyre and Lewis Townships was destroyed.  This impacts accessibility into the community of Marsh Hill.  Another municipal bridge over Potash Hollow Run was destroyed.  There were 20 other municipality owned bridges damaged.
A large earth slide near the junction of Wallis Run Road and Buttermut Grove Road caused a road closure.
There were agricultural impact.  Totals from the Lycoming County Soil Conservation Service District Office show Corn Grain loss was 70 acres at a $35-40,000 total loss.  Grain loss for beans was 15 acres at a $6,000 total loss.  Christmas Tree farms suffered a loss of land and inventory estimated at $400,000.  The Lycoming Consolidated Sportsman���s fish hatchery suffered $18-20,000 in losses.

Thunderstorm Wind in CLEARFIELD, PENNSYLVANIA
From 20-OCT-16 16:54:00 to 20-OCT-16 16:54:00 (EST-5)
Location: CONGRESS HILL
Magnitude: 52.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A severe thunderstorm producing winds estimated near 60 mph knocked down trees along the 8500 block of Gillingham Road in Girard Township.

Thunderstorm Wind in CLINTON, PENNSYLVANIA
From 20-OCT-16 21:13:00 to 20-OCT-16 21:13:00 (EST-5)
Location: CEDAR SPGS
Magnitude: 83.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A severe thunderstorm producing straight line winds estimated at 95 to 100 mph knocked down trees onto a home in Lamar Township, causing one fatality.

Thunderstorm Wind in CLINTON, PENNSYLVANIA
From 20-OCT-16 21:15:00 to 20-OCT-16 21:15:00 (EST-5)
Location: LOCKPORT
Magnitude: 61.00 EG
Property damage: 8.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A severe thunderstorm producing winds estimated near 70 mph caused widespread damage and knocked down trees and wires in Lock Haven.

Thunderstorm Wind in CAMBRIA, PENNSYLVANIA
From 20-OCT-16 19:00:00 to 20-OCT-16 19:00:00 (EST-5)
Location: COLVER
Magnitude: 70.00 EG
Property damage: 40.00K
Crop damage: 0.00K
Reported by: Social Media

A severe thunderstorm producing winds estimated near 80 mph damaged a couple of barns, blew the top off of a silo and damaged or uprooted several trees on a farm north of Ebensburg.