F040 to 72 mph
Light damage. Surface peeled off some roofs, gutters and siding damaged, branches broken, shallow-rooted trees pushed over.
F173 to 112 mph
Moderate damage. Roofs badly stripped, mobile homes overturned or badly damaged, exterior doors lost, windows broken.
F2113 to 157 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.
F3158 to 206 mph
Severe damage. Whole stories of well-built houses destroyed, large buildings badly damaged, trains overturned, trees debarked, heavy cars lifted and thrown.
F4207 to 260 mph
Devastating damage. Well-built houses leveled, structures with weak foundations moved some distance, cars thrown and large missiles generated.
F5261 to 318 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.
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.
Every tornado in Louisiana in 1977
March 3 5 tornadoes
| Date | Time | Rating | Where | Path (mi) | Width (yd) | Deaths | Injuries | Damage |
|---|
| March 3 | 12:30 PM CST | F0 | Lincoln Parish | 0.1 | 10 | | | $5,000 to $50,000 |
| March 3 | 12:30 PM CST | F1 | Lincoln Parish | 34.1 | 100 | | | $50,000 to $500,000 |
| March 3 | 1:00 PM CST | F1 | Union Parish | 31.6 | 10 | | | $5,000 to $50,000 |
| March 3 | 2:00 PM CST | F1 | Morehouse Parish | 38.0 | 10 | | | $50,000 to $500,000 |
| March 3 | 2:11 PM CST | F1 | Caldwell Parish | 6.8 | 77 | | | $5,000 to $50,000 |
March 11 2 tornadoes
| Date | Time | Rating | Where | Path (mi) | Width (yd) | Deaths | Injuries | Damage |
|---|
| March 11 | 4:25 PM CST | F1 | Ouachita Parish | 0.1 | 10 | | | $500 to $5,000 |
| March 11 | 4:55 PM CST | F1 | Morehouse Parish | 6.2 | 150 | | | $50,000 to $500,000 |
March 28 4 tornadoes
| Date | Time | Rating | Where | Path (mi) | Width (yd) | Deaths | Injuries | Damage |
|---|
| March 28 | 1:00 AM CST | F2 | Winn Parish | 6.1 | 10 | | | $5,000 to $50,000 |
| March 28 | 2:20 AM CST | F1 | Saint Martin Parish | 0.1 | 10 | | 3 | $5,000 to $50,000 |
| March 28 | 2:45 AM CST | F1 | Saint Landry Parish | 0.1 | 10 | | 1 | $5,000 to $50,000 |
| March 28 | 3:00 AM CST | F2 | Lafayette Parish | 12.0 | 100 | | 1 | $500,000 to $5 million |
April 19 1 tornado
| Date | Time | Rating | Where | Path (mi) | Width (yd) | Deaths | Injuries | Damage |
|---|
| April 19 | 4:00 PM CST | F1 | Rapides Parish | 1.0 | 50 | | | $5,000 to $50,000 |
April 20 1 tornado
| Date | Time | Rating | Where | Path (mi) | Width (yd) | Deaths | Injuries | Damage |
|---|
| April 20 | 7:00 PM CST | F2 | East Baton Rouge Parish | 0.2 | 67 | | 1 | $50,000 to $500,000 |
April 21 1 tornado
| Date | Time | Rating | Where | Path (mi) | Width (yd) | Deaths | Injuries | Damage |
|---|
| April 21 | 5:15 AM CST | F3 | Saint Martin Parish | 3.8 | 440 | 1 | 11 | $500,000 to $5 million |
May 1 2 tornadoes
| Date | Time | Rating | Where | Path (mi) | Width (yd) | Deaths | Injuries | Damage |
|---|
| May 1 | 4:45 PM CDT | F1 | Bienville Parish | 1.5 | 50 | | | $500 to $5,000 |
| May 1 | 5:30 PM CDT | F1 | Evangeline Parish | 3.3 | 50 | | | $5,000 to $50,000 |
May 2 1 tornado
| Date | Time | Rating | Where | Path (mi) | Width (yd) | Deaths | Injuries | Damage |
|---|
| May 2 | 6:30 PM CDT | F0 | Washington Parish | 0.1 | 23 | | | $50 to $500 |
May 25 1 tornado
| Date | Time | Rating | Where | Path (mi) | Width (yd) | Deaths | Injuries | Damage |
|---|
| May 25 | 5:00 PM CDT | F0 | Calcasieu Parish | 0.1 | 17 | | | $50 to $500 |
May 31 1 tornado
| Date | Time | Rating | Where | Path (mi) | Width (yd) | Deaths | Injuries | Damage |
|---|
| May 31 | 8:30 PM CDT | F0 | Washington Parish | 0.1 | 17 | | | $500 to $5,000 |
June 6 2 tornadoes
| Date | Time | Rating | Where | Path (mi) | Width (yd) | Deaths | Injuries | Damage |
|---|
| June 6 | 4:40 PM CDT | F1 | Lafayette Parish | 23.1 | 50 | | | $5,000 to $50,000 |
| June 6 | 5:15 PM CDT | F0 | Acadia Parish | 0.1 | 17 | | | $50 to $500 |
July 20 1 tornado
| Date | Time | Rating | Where | Path (mi) | Width (yd) | Deaths | Injuries | Damage |
|---|
| July 20 | 3:00 PM CDT | F0 | Assumption Parish | 0.1 | 10 | | | |
July 29 1 tornado
| Date | Time | Rating | Where | Path (mi) | Width (yd) | Deaths | Injuries | Damage |
|---|
| July 29 | 12:45 PM CDT | F1 | Orleans Parish | 4.6 | 100 | | 3 | $5,000 to $50,000 |
September 5 6 tornadoes
| Date | Time | Rating | Where | Path (mi) | Width (yd) | Deaths | Injuries | Damage |
|---|
| September 5 | 6:00 PM CDT | F1 | Livingston Parish | 0.2 | 23 | | | $500 to $5,000 |
| September 5 | 6:15 PM CDT | F1 | Tangipahoa Parish | 0.1 | 50 | | 1 | $500 to $5,000 |
| September 5 | 6:30 PM CDT | F0 | East Baton Rouge Parish | 0.1 | 17 | | | $500 to $5,000 |
| September 5 | 8:15 PM CDT | F2 | Tangipahoa Parish | 1.7 | 70 | | 1 | $500,000 to $5 million |
| September 5 | 9:10 PM CDT | F1 | Tangipahoa Parish | 0.1 | 23 | | | $5,000 to $50,000 |
| September 5 | 12:30 AM CDT | F1 | Washington Parish | 2.5 | 23 | | 1 | $50 to $500 |
September 8 1 tornado
| Date | Time | Rating | Where | Path (mi) | Width (yd) | Deaths | Injuries | Damage |
|---|
| September 8 | 3:45 PM CDT | F0 | Tangipahoa Parish | 0.1 | 17 | | | $500 to $5,000 |
September 14 1 tornado
| Date | Time | Rating | Where | Path (mi) | Width (yd) | Deaths | Injuries | Damage |
|---|
| September 14 | 1:10 AM CDT | F2 | Iberia Parish | 0.2 | 27 | | | $5,000 to $50,000 |
September 19 1 tornado
| Date | Time | Rating | Where | Path (mi) | Width (yd) | Deaths | Injuries | Damage |
|---|
| September 19 | 11:50 AM CDT | F0 | Calcasieu Parish | 0.1 | 10 | | | $50 to $500 |
October 8 1 tornado
| Date | Time | Rating | Where | Path (mi) | Width (yd) | Deaths | Injuries | Damage |
|---|
| October 8 | 4:55 PM CDT | F1 | Jackson Parish | 0.2 | 27 | | | $5,000 to $50,000 |
November 1 1 tornado
| Date | Time | Rating | Where | Path (mi) | Width (yd) | Deaths | Injuries | Damage |
|---|
| November 1 | 7:30 PM CST | F1 | Terrebonne Parish | 0.1 | 13 | | | $5,000 to $50,000 |
November 8 2 tornadoes
| Date | Time | Rating | Where | Path (mi) | Width (yd) | Deaths | Injuries | Damage |
|---|
| November 8 | 4:50 PM CST | F2 | Vermilion Parish | 1.0 | 27 | | 1 | $50,000 to $500,000 |
| November 8 | 8:40 PM CST | F1 | Terrebonne Parish | 0.1 | 17 | | 2 | $50,000 to $500,000 |
November 21 1 tornado
| Date | Time | Rating | Where | Path (mi) | Width (yd) | Deaths | Injuries | Damage |
|---|
| November 21 | 2:00 PM CST | F0 | St. Mary Parish | 0.1 | 10 | | | |
November 27 1 tornado
| Date | Time | Rating | Where | Path (mi) | Width (yd) | Deaths | Injuries | Damage |
|---|
| November 27 | 4:30 PM CST | F0 | Vermilion Parish | 0.1 | 10 | | | $500 to $5,000 |
November 29 2 tornadoes
| Date | Time | Rating | Where | Path (mi) | Width (yd) | Deaths | Injuries | Damage |
|---|
| November 29 | 3:15 PM CST | F1 | Cameron Parish | 0.1 | 17 | | 1 | $5,000 to $50,000 |
| November 29 | 8:00 PM CST | F2 | Livingston Parish | 1.0 | 50 | | 2 | $50,000 to $500,000 |
November 30 1 tornado
| Date | Time | Rating | Where | Path (mi) | Width (yd) | Deaths | Injuries | Damage |
|---|
| November 30 | 9:30 AM CST | F0 | Cameron Parish | 0.2 | 17 | | | |
December 13 1 tornado
| Date | Time | Rating | Where | Path (mi) | Width (yd) | Deaths | Injuries | Damage |
|---|
| December 13 | 5:00 PM CST | F1 | Washington Parish | 0.5 | 27 | | | $500 to $5,000 |
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.