EF1 tornado, Prattmont to Boylston, Alabama, May 4, 2021

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

May 4, 2021

Touchdown

6:17 PM CDT (23:17 UTC)

Lifted

6:28 PM CDT (23:28 UTC)

On the ground

11 minutes

Path length

10.6 miles (17.1 km)

Path width

330 yards (302 m)

Deaths

0

Injuries

0

Counties

Autauga, Elmore and Montgomery counties

Touchdown point

32.471, -86.442

Lift-off point

32.426, -86.269

Record number

2105041717-01

33 damage points were recorded along this path by NWS BMX, in the Damage Assessment Toolkit the survey teams carry. The strongest indicator was rated EF1. The highest wind the damage implies is 100 mph.

• 2 large uprooted in both backyards
• This area was not accessible today, but law enforcement on-scene stated at least some shingles off and trees onto homes.

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

A multi-day severe weather event unfolded across Central Alabama from May 2nd through May 4th. Alabama remained on the eastern side of a broad upper trough positioned over the Plains States. Several upper level impulses emanated from the trough axis and produced severe weather across Alabama. The main severe weather event occurred on May 4th when a QLCS tracked eastward across areas along and east of I-20 and produced widespread wind damage, flash flooding, and tornadoes.

National Weather Service meteorologists surveyed damage in southeast Autauga County and determined that it was consistent with an EF0 tornado, with maximum winds near 75 mph. The tornado was embedded in a fast moving QLCS and touched down in the city of Prattville near the intersection of Richmond Way and Guilford Lane. The tornado traveled east and crossed into Elmore County just east of Castle Brook Drive. The damage consisted mainly of uprooted trees.

National Weather Service meteorologists surveyed damage in extreme southwest Elmore County and determined that it was consistent with an EF1 tornado, with maximum winds near 100 mph. This tornado began in Autauga County and crossed into Elmore County near Castle Brook Drive. Soon after crossing into Elmore County, the tornado made a turn to the southeast at Old Farm Road and crossed over I-65. The tornado produced its highest winds along the I-65 corridor where numerous trees were uprooted and snapped. Some homes were heavily damaged by fallen trees. The tornado continued southeast and crossed Cobbs Ford Road where some buildings had loss of metal roofing. The tornado then crossed Alabama River Parkway before crossing into Montgomery County at the Alabama River.

National Weather Service meteorologists surveyed damage in northwest Montgomery County and determined that it was consistent with an EF0 tornado, with maximum winds near 75 mph. This tornado began in Autauga County, then crossed through Elmore County and into Montgomery County at the Alabama River. The tornado was in a weakening state at this time and traveled southeast for only a few miles before dissipating near the intersection of the Alabama River Parkway and Highway 152. Damage consisted of few uprooted trees.

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.

The county was under a tornado watch, issued at 20:36 UTC and running to 00:01 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 Enhanced Risk, with a 0.05 chance of a tornado within 25 miles. The outlook in force was issued at 19:49 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.

Maxwell Afb/Montgom (MXF), 7 km from the path, in the two hours either side.

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

The Maxwell AFB radar (KMXX), 54 km away, was scanning. The volume nearest the touchdown began at 23:15 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 2021 tornado in AlabamaEvery tornado in Alabama since 1950Warnings in force in Alabama nowThe forecast where you are

38 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.