EF1 tornado, Webster, Massachusetts, August 4, 2018

1. EF065 to 85 mph

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

2. EF186 to 110 mphthis tornado

   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

EF1

Date

August 4, 2018

Touchdown

9:59 AM EDT (13:59 UTC)

Lifted

10:00 AM EDT (14:00 UTC)

On the ground

1 minutes

Path length

0.5 miles (0.8 km)

Path width

300 yards (274 m)

Deaths

0

Injuries

1

Property damage

$5.0 million

County

Worcester County

Touchdown point

42.046, -71.891

Lift-off point

42.051, -71.885

Record number

1808040759-01

A moist, tropical environment was in place across southern New England on the morning of August 4th. A short-wave trough was approaching, along with a cold front. The main concern was for flash flooding, but early morning sunshine destabilized the atmosphere and contributed to the development of the tornado, which had touched down in northeast Connecticut, prior to this second touchdown.

In just about one minute, an EF-1 tornado, with maximum winds estimated at 110 mph, wreaked havoc in the easternmost portion of Dudley, MA and in the downtown portion of Webster, MA. It touched down along Route 12 (Schofield Avenue) to the west of Laprise Court in Dudley and traveled northeastward onto Main Street in Webster, then lifted near the French River by Oxford Avenue. ||Many trees were snapped and debarked. In Webster, a gas station overhang was twisted. An old brick rooftop was damaged, with bricks having fallen onto Main Street. The rubber roof covering of another building was peeled completely off. Windows were blown out at a business on Main Street and the street was littered with broken glass. The side walls of an apartment complex were bent slightly outward toward the tornado. Window screens were sucked outward. A car windshield and side mirror was damaged. There were other reports of trees fallen onto cars. Utility poles were snapped and numerous wires were downed. According to MEMA, at least 3 buildings were condemned and at least 5 were uninhabitable.||Nearly everyone that our survey team spoke with had heard the warning via the Wireless Emergency Alert on their cell phones as much as 20+ minutes in advance of the touchdown! This undoubtedly played a big role in the fact that there were no fatalities. According to media reports, there was one minor injury when part of a roof fell on top of a woman's car.

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

24 minutes of warning. NWS BOX issued a tornado warning for this county at 13:35 UTC, 24 minutes before the tornado touched down, in force until 14:00 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 Marginal Risk, with a 0.02 chance of a tornado within 25 miles. The outlook in force was issued at 12:52 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.

Worcester (ORH), 24 km from the path, in the two hours either side.

From the Iowa Environmental Mesonet's archive of airport observations.

The Boston radar (KBOX), 63 km away, was scanning. The volume nearest the touchdown began at 13:59 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 2018 tornado in MassachusettsEvery tornado in Massachusetts since 1950Warnings in force in Massachusetts nowThe forecast where you are

2 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.