EF0 tornado, Huey, Pennsylvania, July 11, 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

July 11, 2017

Touchdown

6:45 PM EDT (22:45 UTC)

Lifted

6:48 PM EDT (22:48 UTC)

On the ground

3 minutes

Path length

1.0 miles (1.6 km)

Path width

250 yards (229 m)

Deaths

0

Injuries

0

Property damage

$10,000

County

Clarion County

Touchdown point

41.077, -79.566

Lift-off point

41.072, -79.548

Record number

1707111645-01

Shortwave and embedded MCV became the focus for showers and thunderstorms, especially along an area of weak convergence/boundary over western Pennsylvania, northern West Virginia, and southeastern Ohio on the 11th. A few storms became severe, with an EF-0 tornado confirmed near Rimersburg in Clarion County, PA.

The National Weather Service survey team confirmed a tornado near Rimersburg in Toby Township in Clarion County in Western Pennsylvania on July 11, 2017. A damage path a found extending from Zanot Road east-southeastward to the intersection of Cherry Run Road and Rimer Road to Fink Road in Toby Township, roughly 4 miles northwest of Rimersburg. Observed damage was exclusively to trees, with many examples of broken large limbs, trunk snaps, and uproots of both healthy and unhealthy trees. The most significant damage occurred during the early part of the track along Zanot Road to its intersection with Cherry Run Road. It was here that the greatest concentration of tree damage was found, with several healthy trees snapped and uprooted. A convergent damage path was noted, as opposed to a uniform or spreading direction, which suggested tornadic activity. Further down the track, tree damage was less significant and limited to smaller trees. While tree damage was significant, especially in the first portion of the track, the overall lack of damage to structures plus the antecedent wet soils allows the wind speed to be capped at 75 MPH. Thus, the tornado has been rated an EF0 on the Enhanced Fujita Scale.

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 Marginal Risk. The outlook in force was issued at 19:35 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 Pittsburgh radar (KPBZ), 82 km away, was scanning. The volume nearest the touchdown began at 22:43 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 2017 tornado in PennsylvaniaEvery tornado in Pennsylvania since 1950Warnings in force in Pennsylvania nowThe forecast where you are

12 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.