Flash Flood, Assumption
- When
- April 11, 9:30 AM CST to 12:00 PM CST
- Where
- Assumption County, Labadieville
- Property damage
- $10,000
- Coordinates
- 29.901, -91.063 (the zone’s center; the record gives no point)
Tornadoes and Flash Flood in Louisiana, April 11, 1997
A cluster of severe thunderstorms moved northeast out of the Gulf of Mexico across portions of southeast Louisiana. A tornado touched down briefly at Galliano causing damage to one house and minor damage to 22 others.
Where it happened
Every event with a place to put it; 3 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
- Tornadoes
- Tropical storms and surge
- Floods
- Wind
- Hail
- Winter weather
- Heat and drought
- Cold
- Fire, smoke and dust
- Marine and coastal
- Other
The toll
- Deaths
- 0
- Injuries
- 0
- Property damage
- $164,000
- Crop damage
- None recorded
- Events
- 11
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
What happened
The episode as NWS LIX wrote it up.
A cluster of severe thunderstorms moved northeast out of the Gulf of Mexico across portions of southeast Louisiana. A tornado touched down briefly at Galliano causing damage to one house and minor damage to 22 others. A metal roof of a building was blown off, and a 25 foot boat was capsized. South of Ponchatoula a tornado was spotted by motorists but no damage was reported. Wind damage to structures occurred in Labadieville, Boutte, and south of Franklinton. The remainder of the damage reported were downed trees, large limbs, and power lines. Heavy rainfall of 4 to 5 inches in Assumption Parish caused flooding in which six houses were flooded. Extensive street flooding occurred in communities in St. James Parish.
The radar
The national radar mosaic for the moment the first event began.
Event by event
6 thunderstorm wind, 2 tornado, 1 flash flood, 1 flood, 1 lightning. Local standard time, as filed.
Flood, St. James
- When
- April 11, 9:30 AM CST to 12:00 PM CST
- Where
- St. James County, Gramercy
- Coordinates
- 30.026, -90.796 (the zone’s center; the record gives no point)
Thunderstorm Wind, Assumption
- When
- April 11, 9:30 AM CST
- Where
- Assumption County, Labadieville
- Property damage
- $25,000
- Coordinates
- 29.830, -90.970
Lightning, East Baton Rouge
- When
- April 11, 9:40 AM CST
- Where
- East Baton Rouge County, 2 mi S of Greenwell Spgs
- Property damage
- $60,000
- Coordinates
- 30.538, -91.096 (the zone’s center; the record gives no point)
Thunderstorm Wind, Lafourche
- When
- April 11, 9:55 AM CST
- Where
- Lafourche County, Larose
- Property damage
- $2,000
- Coordinates
- 29.570, -90.400
Tornado, Lafourche
- When
- April 11, 10:00 AM CST
- Where
- Lafourche County, Galliano
- Rating
- F0
- Path length
- 0.3 mi
- Path width
- 100 yd
- Property damage
- $50,000
- Coordinates
- 29.470, -90.300
Thunderstorm Wind, St. Charles
- When
- April 11, 10:30 AM CST
- Where
- St. Charles County, Boutte
- Property damage
- $1,000
- Coordinates
- 29.900, -90.380
Tornado, Tangipahoa
- When
- April 11, 10:55 AM CST
- Where
- Tangipahoa County, 5 mi S of Ponchatoula
- Rating
- F0
- Path length
- 0.2 mi
- Path width
- 25 yd
- Coordinates
- 30.370, -90.430
Thunderstorm Wind, Tangipahoa
- When
- April 11, 11:10 AM CST
- Where
- Tangipahoa County, Ponchatoula
- Property damage
- $300
- Coordinates
- 30.430, -90.430
Thunderstorm Wind, St. Tammany
- When
- April 11, 11:15 AM CST
- Where
- St. Tammany County, Covington to 3 mi S of Covington
- Property damage
- $300
- Coordinates
- 30.430, -90.100
Thunderstorm Wind, Washington
- When
- April 11, 12:10 PM CST to 12:15 PM CST
- Where
- Washington County, Franklinton to 5 mi S of Pine
- Property damage
- $15,000
- Coordinates
- 30.780, -90.150
What these are
- Flash Flood
- Flooding that begins within six hours of the rain that causes it, or of a dam or levee failure or ice jam release, often with deadly speed.
- Flood
- Flooding that develops more slowly than a flash flood: rivers leaving their banks, or water standing over land for an extended time.
- Thunderstorm Wind
- Winds from a thunderstorm of 50 knots (58 mph) or more, or lower winds that caused damage or casualties. Measured gusts are marked MG, estimated EG.
- Lightning
- A lightning strike that killed, injured or caused damage.
- Tornado
- A violently rotating column of air in contact with the ground and extending from a thunderstorm, filed with its path, width and Fujita or Enhanced Fujita rating from the damage survey.
After NWS Directive 10-1605, the rules offices file Storm Data by.
The same day elsewhere
- Hurricane and Heavy Rain in Guam, April 11 to 19, 1997
- Flood in Oklahoma, April 11, 1997
- Hail and Damaging Winds in Texas, April 11, 1997
- Damaging Wind in Texas, April 11, 1997
- Damaging Winds in Texas, April 11, 1997
- Hail in Texas, April 11, 1997
- Lightning Strike in Louisiana, April 11, 1997
- Winter Storm in Nebraska, April 11 to 12, 1997
- Tornado in Texas, April 11, 1997
- Tornado in Texas, April 11, 1997
- Hail in Texas, April 11, 1997
- High Wind in Georgia, April 11 to 12, 1997
More
Every storm in Louisiana in 1997Every state in 1997This day in weather historyThe tornado archive for Louisiana, 1997Warnings in Louisiana, April 1997
Sources
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-30. Each event’s entry at NCEI: 5598490, 5598491, 5598492, 5598493, 5598494, 5598495, 5598496, 5598497, 5598498, 5598499, 5598500.