EF0 tornado, Fern to Millerstown, Pennsylvania, June 19, 2017

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

June 19, 2017

Touchdown

5:52 PM EDT (21:52 UTC)

Lifted

5:53 PM EDT (21:53 UTC)

On the ground

1 minutes

Path length

0.8 miles (1.2 km)

Path width

60 yards (55 m)

Deaths

0

Injuries

0

Property damage

$20,000

County

Clarion County

Touchdown point

41.304, -79.520

Lift-off point

41.305, -79.509

Record number

1706191552-02

Placeholder.

Upper trough moving across the region coincided with an area of low CAPE but high shear, which supported the development of a weak tornado over Clarion county, Pennsylvania on June 19th. Damage from the tornado was primarily to trees, though a few outbuildings were also damaged.

A National Weather Service survey team confirmed an EF0 tornado occurred Monday evening along Millerstown Road in Elk Township, Clarion county. There were several reported sightings of a funnel cloud along with one person confirming it reached the ground. The only structural damage was to outbuildings and barns with sheet metal roofs. Hardwood trees were used to determine the rating as numerous trees were uprooted or snapped along the north side of Millerstown Road. The storm tracked across Millerstown Road just east of the 598 postal address and uprooted and snapped several additional trees before lifting just prior to reaching Pine City Road.

A survey conducted by the National Weather Service in Pittsburgh concluded that a tornado occurred Monday evening, June 19th, in Elk Township in Clarion county. A weak tornado touchdown occurred Monday evening along Millerstown Road in Elk Township Clarion county. There were several reported sitings of a funnel cloud along with one person confirming it reached the ground. The only structural damage was |to outbuildings and barns with sheet metal roofs. Hardwood trees were used to determine the rating as numerous trees were uprooted or snapped along the north side of Millerstown Road. The storm tracked across Millerstown Road just east of the 598 postal address and uprooted and snapped several additional trees before lifting just prior to the reaching Pine City Road.

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 19:51 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.

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 2017 tornado in PennsylvaniaEvery tornado in Pennsylvania since 1950Warnings in force in Pennsylvania nowThe forecast where you are

5 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.