A devastating severe weather event struck Northern and Central Pennsylvania during the afternoon of July 21, 2003. The worst damage occurred over the Northern Pennsylvania Counties of McKean and Potter. Below are some preliminary images showing the damage, and two radar loops from the State College National Weather Service Doppler Radar. A more formal assessment of this event is underway. The Text of the Preliminary Storm Damage Survey Reports (issued as "Public Information Statements") from that day's more significant areas of damage follow after the picture links.
A second day of severe weather followed on the 22nd, producing very large hail, and a weak tornado a few miles north of Harrisburg in Dauphin County. This Storm Damage Survey Report (and links to a few pictures of the damage) are also included here.
Pictures of damage in the town of Ellisburg, Potter County which is northeast of Coudersport, PA. This damage was caused by an F3 tornado. The Slide Shows and Pictures will take a very long time to download. Please be patient.
PPT Slide Show 1 (Northern Potter County) (1.1 Mb)
PPT Slide Show 2 (Northern Potter County) (0.5 Mb)
Pictures of damage (PPT) (0.4 Mb) in the borough of Coudersport, PA
Pictures of damage (PPT) (0.4 Mb) in Austin, PA which is southwest of Coudersport.
Pictures of damage (PPT) (4.8 Mb) in McKean County including the Kinzua Bridge collapse.
The radar loops below may also take some time to download especially with a dial-up connection.
Here is a loop of radar reflectivity (2.5 Mb) of the storms in progress as they swept across McKean and Potter counties. This loop ranges from 2:00 PM to 5:00 PM.
Another loop of storm relative velocity (1.0 Mb) of the storms in progress as they swept across McKean and Potter counties. This loop ranges from 2:00 PM to 5:00 PM. Green colors show wind flow towards the radar (located to the south of these images) and red colors show wind flow away from the radar.
Here is a link to a Java Image Loop of the Radar Reflectivity on Monday the 21st.