Tornadoes · United States · Pennsylvania · 2003
F0 tornado, Perryville, Pennsylvania, May 11, 2003
This F0 tornado ran 1.3 miles across Lycoming County on May 11, 2003, touching down at 4:10 PM EDT and reaching 75 yards wide. It killed nobody, and did $10,000 of property damage.
The rating scale
Tracks are drawn in the color of the rating. The Fujita scale rates the damage rather than measuring the wind: the speeds are what that damage is taken to imply.
F040 to 72 mphthis tornado
Light damage. Surface peeled off some roofs, gutters and siding damaged, branches broken, shallow-rooted trees pushed over.
F173 to 112 mph
Moderate damage. Roofs badly stripped, mobile homes overturned or badly damaged, exterior doors lost, windows broken.
F2113 to 157 mph
Considerable damage. Roofs torn off well-built houses, frame homes shifted on their foundations, mobile homes destroyed, large trees snapped or uprooted, cars lifted off the ground.
F3158 to 206 mph
Severe damage. Whole stories of well-built houses destroyed, large buildings badly damaged, trains overturned, trees debarked, heavy cars lifted and thrown.
F4207 to 260 mph
Devastating damage. Well-built houses leveled, structures with weak foundations moved some distance, cars thrown and large missiles generated.
F5261 to 318 mph
Incredible damage. Strong frame houses swept off their foundations, car-sized missiles thrown more than 100 meters, steel-reinforced concrete badly damaged, high-rise buildings deformed.
Unrated
The survey recorded a tornado but could not put a number on it, most often because it crossed open country and damaged nothing a rating can be read from.
The record
- Rating
- F0
- Date
- May 11, 2003
- Touchdown
- 4:10 PM EDT (20:10 UTC)
- Path length
- 1.3 miles (2.1 km)
- Path width
- 75 yards (69 m)
- Deaths
- 0
- Injuries
- 0
- Property damage
- $10,000
- County
- Lycoming County
- Touchdown point
- 41.320, -77.080
- Lift-off point
- 41.320, -77.080
- Record number
- 124
What the Weather Service recorded
A thunderstorm spawned a weak (F0) tornado on the afternoon of May 11th in Lycoming county. The tornado touched down on Paulhamous Road in Anthony Township, about 3 miles southwest of the town of Cogan Station. The tornado had a sporadic path length of 1.3 miles, lifting off and touching down several times along it's path. The tornado moved to the east into Lycoming township, finally lifting off the ground for good on Maple Spring Road. There, it downed a dozen trees, and tore a tin roof off of a barn. One fallen tree struck a parked car, causing $1000 in damage. At it's widest, the tornado was 75 yards wide. There were no reported injuries or deaths associated with the storm.
From NOAA NCEI's Storm Events Database, the narrative the local forecast office wrote for Storm Data.
The warnings
21 minutes of warning. NWS CTP issued a tornado warning for this county at 19:49 UTC, 21 minutes before the tornado touched down, in force until 20:30 UTC.
| Issued (UTC) | Expired | Product | Office |
|---|---|---|---|
| 19:36 UTC | 20:30 UTC | Severe Thunderstorm Warning | CTP |
| 19:49 UTC | 20:30 UTC | Tornado Warning | CTP |
| 20:30 UTC | 20:45 UTC | Severe Thunderstorm Warning | CTP |
Every warning and watch covering the touchdown point that day, from the Iowa Environmental Mesonet's archive of National Weather Service products. Lead time is measured from the issue of the warning in force to the touchdown time in the database, both of which were recorded to the minute by different people.
The forecast that day
The Storm Prediction Center had this point in a Moderate Risk, with a 0.15 chance of a tornado within 25 miles, in the hatched area where significant tornadoes were expected. The outlook in force was issued at 20:47 UTC.
SPC's Day 1 convective outlook as it stood when the tornado began, read at the touchdown point. The same archive is on the radar archive.
The surface observations
Williamsport (IPT), 16 km from the path, in the two hours either side.
| Time (UTC) | Temp (°F) | Dew point (°F) | Wind | Gust (kt) | Pressure (mb) | Weather |
|---|---|---|---|---|---|---|
| 18:54 UTC | 75 | 66 | 140° 12 kt | 997.6 | HZ | |
| 19:54 UTC | 76 | 67 | 140° 13 kt | 21 | 996.3 | HZ |
| 20:03 UTC | 75.2 | 66.2 | 140° 12 kt | 22 | 995.9 | VCTS HZ |
| 20:54 UTC | 75 | 67 | 160° 14 kt | 19 | 995.6 | HZ |
| 21:22 UTC | 71.6 | 68 | 150° 14 kt | 29 | 995.3 | +RA BR |
| 21:31 UTC | 73.4 | 69.8 | 180° 14 kt | 21 | 995.3 | -RA BR |
| 21:45 UTC | 73.4 | 68 | 160° 15 kt | 994.9 | VCTS HZ | |
| 21:54 UTC | 74 | 68 | 160° 12 kt | 994.9 | HZ |
From the Iowa Environmental Mesonet's archive of airport observations.
The radar
The State College radar (KCCX), 89 km away, was scanning. The volume nearest the touchdown began at 20:11 UTC.
Open the radar archive at this moment, over the track
Reflectivity and velocity, decoded from the Level II archive in the browser. Volumes take a few seconds to open the first time.
This ground now
The live radar over the trackEvery 2003 tornado in PennsylvaniaEvery tornado in Pennsylvania since 1950Warnings in force in Pennsylvania nowThe forecast where you are
The other tornadoes of May 11, 2003
13 more were confirmed in the United States that day.
| Date | Time | Rating | Where | Path (mi) | Width (yd) | Deaths | Injuries | Damage |
|---|---|---|---|---|---|---|---|---|
| May 11 | 1:18 AM CDT | F3 | McLean, KY | 1.8 | 80 | 2 | $400,000 | |
| May 11 | 4:10 AM EDT | F2 | Hardin, KY | 6.5 | 120 | 5 | $1.0 million | |
| May 11 | 3:12 AM CDT | F1 | Davidson, TN | 4.5 | 200 | $500,000 | ||
| May 11 | 3:20 AM CDT | F3 | Williamson, TN | 1.0 | 300 | 1 | $2.2 million | |
| May 11 | 3:20 AM CDT | F1 | Wilson, TN | 3.6 | 200 | $500,000 | ||
| May 11 | 3:30 AM CDT | F1 | Williamson, TN | 0.5 | 200 | |||
| May 11 | 3:40 AM CDT | F1 | Sumner, TN | 5.5 | 200 | |||
| May 11 | 3:50 AM CDT | F3 | Rutherford, TN | 1.0 | 400 | $1.8 million | ||
| May 11 | 3:59 AM CDT | F1 | Hart, KY | 2.0 | 50 | $100,000 | ||
| May 11 | 5:30 AM EDT | F2 | Mercer, KY | 7.0 | 300 | 1 | 8 | $15 million |
| May 11 | 6:55 AM EDT | F1 | Garrard, KY | 1.0 | 75 | $100,000 | ||
| May 11 | 3:30 PM EDT | F1 | Wayne, NY | 2.3 | 50 | $150,000 | ||
| May 11 | 5:30 PM PDT | F0 | Grant, WA | 0.1 | 0 |
What this means
Ratings are the survey's, read off the damage rather than measured; the rating scale is above. Tornado counts rise through the record as reporting improved, so a year in the 1950s is not comparable with one today except for the strongest tornadoes, which were always noticed.
Sources
NOAA Storm Prediction Center tornado database, 1950-2025, the official record kept by NOAA's Storm Prediction Center.