EF0 tornado, Brock to Lost Mtn, Georgia, January 11, 2020

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

January 11, 2020

Touchdown

4:52 PM EST (21:52 UTC)

Lifted

4:56 PM EST (21:56 UTC)

On the ground

4 minutes

Path length

3.9 miles (6.2 km)

Path width

400 yards (366 m)

Deaths

0

Injuries

0

Property damage

$100,000

Counties

Paulding and Cobb counties

Touchdown point

33.911, -84.758

Lift-off point

33.929, -84.695

Record number

2001111552-01

18 damage points were recorded along this path by NWS FFC, in the Damage Assessment Toolkit the survey teams carry. The strongest indicator was rated EF0. The highest wind the damage implies is 85 mph.

• Large but weakened sweetgum tree fell on home

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

A strong cold front associated with a deep upper-level trough moved through the region. A line of strong to severe thunderstorms ahead of the cold front swept into northwest Georgia during the afternoon and progressed southeastward across north and central Georgia through the late afternoon into the evening before weakening and pushing into south Georgia and the Carolinas during the early morning hours. Numerous reports of damaging thunderstorm winds and a few isolated tornadoes were received.

A National Weather Service survey team found that an EF0 tornado with maximum wind speeds of 85 mph and a maximum path width of 400 yards touched down north of Hiram along Macland Road just west of Hiram-Acworth Highway. The tornado traveled east-northeast with mostly weak and intermittent damage, the most notable occurring on Cristy Drive where a dozen large trees were snapped or uprooted. One tree fell on the master bedroom of a 2-story home. The tornado continued causing sporadic damage as it moved east-northeast crossing into western Cobb County near the intersection of Poplar Springs Road and Puryear Path. [01/11/20: Tornado #1, County #1/2, EF-0, Paulding/Cobb, 2020:001].

A National Weather Service survey team found that an EF0 tornado with maximum wind speeds of 85 mph and a maximum path width of 400 yards that touched down north of Hiram in Paulding County moved east-northeast into western Cobb County near the intersection of Poplar Springs Road and Puryear Path. The tornado caused mostly sporadic, weak damage as it crossed Mill creek and Corner Road SW but downed 15 to 20 trees in the Oakleigh subdivision near the intersection of Lost Mountain Road and Kingsbridge Pass before ending along Oakleigh Manor Drive SW. [01/11/20: Tornado #1, County #2/2, EF-0, Paulding/Cobb, 2020:001].

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 18:44 UTC and running to 22:53 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 20:00 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 Atlanta radar (KFFC), 64 km away, was scanning. The volume nearest the touchdown began at 21:50 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 2020 tornado in GeorgiaEvery tornado in Georgia since 1950Warnings in force in Georgia nowThe forecast where you are

62 more were confirmed in the United States that day.

All 63 of them

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.