EF0 tornado, Lynnville to New Tripoli, Pennsylvania, July 14, 2010

1. EF065 to 85 mphthis tornado

   Light damage. Surface peeled off some roofs, gutters and siding damaged, branches broken, shallow-rooted trees pushed over.

2. EF186 to 110 mph

   Moderate damage. Roofs badly stripped, mobile homes overturned or badly damaged, exterior doors lost, windows broken.

3. EF2111 to 135 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.

4. EF3136 to 165 mph

   Severe damage. Whole stories of well-built houses destroyed, large buildings badly damaged, trains overturned, trees debarked, heavy cars lifted and thrown.

5. EF4166 to 200 mph

   Devastating damage. Well-built houses leveled, structures with weak foundations moved some distance, cars thrown and large missiles generated.

6. EF5over 200 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.

7. 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.

Rating

EF0

Date

July 14, 2010

Touchdown

4:00 AM EDT (08:00 UTC)

Lifted

4:04 AM EDT (08:04 UTC)

On the ground

4 minutes

Path length

2.2 miles (3.5 km)

Path width

150 yards (137 m)

Deaths

0

Injuries

0

Property damage

$500,000

County

Lehigh County

Touchdown point

40.650, -75.760

Lift-off point

40.681, -75.752

Record number

1007140200-01

Thunderstorms that moved along a warm frontal boundary produced an isolated tornado in Lehigh County.

An EF0 tornado touched down on the Lynn Acres Farm on Kistler Valley Road around 400 a.m. EDT. Numerous trees were uprooted or snapped. Three homes, one significantly, were damaged by the fallen trees. On the farm, a small barn had half its roof completely removed and other structures sustained roof damage. This included portions of a metal roof. Parts of the metal roof were found along the two mile damage path. There were numerous trees toppled or sheared off around the farm and along a ravine that runs through the farmland. Some of the corn in two separate fields was partially flattened. The tornado then traveled north near Sechler Road with several trees uprooted or sheared off along the way. The most widespread damage occurred near the intersection of Sechler Road and Wedge Drive where numerous large trees were completely uprooted or sheared off about 20 feet above the ground. Two homes were damaged on Sechler Road by the downed trees. The tornado then appeared to have lifted at times as the damage was more sporadic. The tornado continued on a northward track and dissipated near the intersection of Decatur Street, Pennsylvania State Route 143 and Madison Street. Two large trees were completely uprooted and damaged the chimney and roof of the back of one home at that intersection. The tornado's path length was about 2.2 miles. Its maximum path length was 150 yards and its estimated maximum wind speed was 80 mph. No injuries were reported.

From NOAA NCEI's Storm Events Database, the narrative the local forecast office wrote for Storm Data.

No tornado warning for this county appears in the archive as in force at the moment the tornado touched down.

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 Storm Prediction Center had this point in a General Thunderstorms Risk. The outlook in force was issued at 06:03 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 radiosonde launches on either side of the tornado, from the nearest station that was launching then, drawn and analyzed the way Storm Lab does: the same diagram, the same parcel and shear definitions SPC's mesoanalysis uses.

The Philadelphia radar (KDIX), 139 km away, was scanning. The volume nearest the touchdown began at 07:58 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.

Local storm reports within 60 km of the path, in the three hours either side.

From the Iowa Environmental Mesonet's archive of National Weather Service local storm reports.

The live radar over the trackEvery 2010 tornado in PennsylvaniaEvery tornado in Pennsylvania since 1950Warnings in force in Pennsylvania nowThe forecast where you are

14 more were confirmed in the United States that day.

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.

NOAA Storm Prediction Center tornado database, 1950-2025, the official record kept by NOAA's Storm Prediction Center.