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March 17, 2021 · Blount County · 2021
EF1

March 17, 2021

4:43 PM
Blount County, Alabama · Near Oneonta (ZIP 35031)
Fatalities
0
Injuries
0
Path Length
12.9 mi
Max Width
300 yd
DateMarch 17, 2021
Time4:43 PM
CountyBlount
CityOneonta
Property Loss$0
Crop Loss$0
SourceNCEI 945121
NWS Birmingham

2 S Fairview - 2 ENE Hendrix The tornado began near Tim King Road along Hunt Mountain. It moved northeast and crossed Highway 231 and ended along Wilson Chapel Road. Damage consisted mainly of snapped and uprooted trees. The tornado then crossed Wilson Chapel Road where it snapped a couple of trees and rolled a camper at a residence before dissipating. The tornado damage path was 12.89 miles long and was 300 yards wide at its widest point. The maximum winds were estimated around 100 mph. Start: 33.9227/-86.5587 End: 34.0614/-86.4172

NWS EF Scale: F1

Event Narrative

National Weather Service meteorologists surveyed damage in Blount County and determined that it was consistent with an EF1 tornado, with maximum winds near 100 mph. The tornado began near Tim King Road along Hunt Mountain. It moved northeast and crossed Highway 231, with damage consisting mainly of snapped and uprooted trees. The tornado then crossed Wilson Chapel Road where it snapped a couple of trees and rolled a camper at a residence before dissipating.

Episode Narrative

An active southern jet stream set-up across the southern United States during the middle of March. Several short-wave troughs became negatively tilted as each one traversed across Texas and towards Alabama. This resulted in a single hail event one Monday, March 15, and significant tornado outbreak on Wednesday, March 17. Many supercells began to develop across Central Alabama by midday Wednesday and continued into the evening hours before a squall line moved through the state. Sufficient instability and strong wind shear produced conditions favorable for tornadoes to develop. The event consisted of twenty-one tornadoes in the NWS Birmingham forecast area.

Outbreak Context

Part of 21-tornado outbreak on March 17, 2021

Shared Episode Narrative

An active southern jet stream set-up across the southern United States during the middle of March. Several short-wave troughs became negatively tilted as each one traversed across Texas and towards Alabama. This resulted in a single hail event one Monday, March 15, and significant tornado outbreak on Wednesday, March 17. Many supercells began to develop across Central Alabama by midday Wednesday and continued into the evening hours before a squall line moved through the state. Sufficient instability and strong wind shear produced conditions favorable for tornadoes to develop. The event consisted of twenty-one tornadoes in the NWS Birmingham forecast area.

Source Data
NCEI Event ID: 945121
SWDI Tornado ID: 2021-03-17T22:42:59Z_KBMX_F0
SWDI Radar Site: KBMX
SWDI Signature: TVS

See Also

12.9 mi300 yd wide