EF0 tornado, Cooch, Delaware, June 10, 2013

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 10, 2013

Touchdown

4:47 PM EDT (20:47 UTC)

Lifted

4:48 PM EDT (20:48 UTC)

On the ground

1 minutes

Path length

0.9 miles (1.4 km)

Path width

150 yards (137 m)

Deaths

0

Injuries

0

County

New Castle County

Touchdown point

39.650, -75.740

Lift-off point

39.660, -75.730

Record number

1306101447-01

1 damage points were recorded along this path by NWS PHI, in the Damage Assessment Toolkit the survey teams carry. The strongest indicator was rated EF0. The highest wind the damage implies is 74 mph.

Survey points are preliminary and are the raw material the published rating was built from. Source: NWS Damage Assessment Toolkit.

A severe thunderstorm produced a tornado and wind damage in western New Castle County during the afternoon of the 10th.

An EF0 tornado was confirmed near Newark at 447 p.m. EDT. The damage was focused from Ardmore Drive to Argyle Road, south of DE Route 4. Within this area, 10 to 20 homes sustained damage with several homes suffering significant damage due to large trees being blown into them. On Natalie Lane, a very large tree completely fell over and landed onto two homes with a car having significant damage. Other homes suffered siding and shingle damage. One house on Argyle Road had a tree limb through a side wall. On Havertown Road, several trees were uprooted, with some lying west and northwest, which appeared to be the western edge of the circulation. Several residents reported hearing a whooshing sound that lasted for about 10 to 15 seconds, along with some tree debris swirling into the air. Based on damage reports, the tornado briefly lifted with the main touchdown located from Ardmore Drive to Argyle Road. ||Additional damage was reported to the south of the tornado path, including siding and tree damage. One she was reportedly blown onto its side along McCormick Boulevard. The overall path length was nearly one mile. The maximum path width was 150 yards and the estimated maximum wind was 80 mph.

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

1 minute of warning. NWS PHI issued a tornado warning for this county at 20:46 UTC, 1 minute before the tornado touched down, in force until 21:15 UTC.

The county was under a tornado watch, issued at 18:06 UTC and running to 04:00 UTC.

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 Slight Risk, with a 0.05 chance of a tornado within 25 miles. The outlook in force was issued at 19:58 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 Dover AFB radar (KDOX), 96 km away, was scanning. The volume nearest the touchdown began at 20:46 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 2013 tornado in DelawareEvery tornado in Delaware since 1950Warnings in force in Delaware nowThe forecast where you are

7 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.