Alert archive / Louisiana / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 112, NWS New Orleans, LA
NWS New Orleans, LA issued this severe thunderstorm warning at May 20, 2021, 10:52 AM CDT for Saint Charles Parish, Saint John the Baptist Parish, Louisiana. It was in force for 19 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- May 20, 2021, 10:52 AM CDT (15:52 UTC)
- Expired
- May 20, 2021, 11:11 AM CDT
- In force
- 19 min
- Issued by
- NWS New Orleans, LA
- Area
- Storm-based polygon
- Tornado
- Possible
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Saint Charles Parish, LA, Saint John the Baptist Parish, LA
The nearest sounding before it
Slidell Radar S, LA (KSIL), launched 12:00Z, 3.9 hours before the alert went out and 87 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 622 J/kg
- Mixed-layer CIN
- -1 J/kg
- Mixed-layer LCL
- 599 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 152 m²/s²
- 0-3 km storm-relative helicity
- 227 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
515
WUUS54 KLIX 201552
SVRLIX
LAC089-095-201700-
/O.NEW.KLIX.SV.W.0112.210520T1552Z-210520T1700Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service New Orleans LA
1052 AM CDT Thu May 20 2021
The National Weather Service in New Orleans has issued a
* Severe Thunderstorm Warning for...
Western St. John The Baptist Parish in southeastern Louisiana...
Northwestern St. Charles Parish in southeastern Louisiana...
* Until noon CDT.
* At 1052 AM CDT, a severe thunderstorm was located near Killona, or
near Reserve, moving north at 25 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Locations impacted include...
Reserve, Laplace, Garyville, Edgard, Wallace and Killona.
This includes Interstate 10 in Louisiana between mile markers 198 and
204.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3022 9063 3022 9058 3019 9060 3017 9057
3017 9051 2995 9052 2995 9060 3006 9066
TIME...MOT...LOC 1552Z 160DEG 20KT 2998 9054
TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH
$$
CAB2 follow-up statements
382
WWUS54 KLIX 201557
SVSLIX
Severe Weather Statement
National Weather Service New Orleans LA
1057 AM CDT Thu May 20 2021
LAC089-201606-
/O.CAN.KLIX.SV.W.0112.000000T0000Z-210520T1700Z/
St. Charles LA-
1057 AM CDT Thu May 20 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN ST. CHARLES
PARISH IS CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
LAT...LON 3022 9063 3022 9058 3019 9060 3017 9057
3017 9051 3002 9052 3002 9053 3000 9055
2996 9055 2998 9058 3008 9066
TIME...MOT...LOC 1556Z 160DEG 20KT 3001 9055
$$
LAC095-201700-
/O.CON.KLIX.SV.W.0112.000000T0000Z-210520T1700Z/
St. John The Baptist LA-
1057 AM CDT Thu May 20 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL NOON CDT FOR
WESTERN ST. JOHN THE BAPTIST PARISH...
At 1056 AM CDT, a severe thunderstorm was located over Edgard, or
near Reserve, moving north at 25 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Reserve, Laplace, Garyville, Edgard and Killona.
This includes Interstate 10 in Louisiana between mile markers 197 and
204.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3022 9063 3022 9058 3019 9060 3017 9057
3017 9051 3002 9052 3002 9053 3000 9055
2996 9055 2998 9058 3008 9066
TIME...MOT...LOC 1556Z 160DEG 20KT 3001 9055
TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH
$$
CAB932
WWUS54 KLIX 201611
SVSLIX
Severe Weather Statement
National Weather Service New Orleans LA
1111 AM CDT Thu May 20 2021
LAC095-201621-
/O.CAN.KLIX.SV.W.0112.000000T0000Z-210520T1700Z/
St. John The Baptist LA-
1111 AM CDT Thu May 20 2021
...THE SEVERE THUNDERSTORM WARNING FOR WESTERN ST. JOHN THE BAPTIST
PARISH IS CANCELLED...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled.
LAT...LON 3022 9063 3022 9058 3019 9060 3017 9057
3017 9051 3002 9052 3002 9053 3000 9055
2996 9055 2998 9058 3008 9066
TIME...MOT...LOC 1610Z 160DEG 20KT 3008 9058
$$
CABThe office that day
Everything else NWS New Orleans, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 19, 7:03 PM CDT | Special Weather Statement | LIX | Saint Tammany | 42 min |
| May 19, 7:24 PM CDT | Special Marine Warning | LIX | 81 min | |
| May 19, 8:00 PM CDT | Severe Thunderstorm Warning | LIX | Saint Charles, Saint John the Baptist | 25 min |
| May 19, 8:30 PM CDT | Special Marine Warning | LIX | 30 min | |
| May 19, 9:19 PM CDT | Areal Flood Advisory | LIX | Ascension, East Baton Rouge, Iberville, Livingston | 116 min |
| May 20, 3:42 AM CDT | Special Weather Statement | LIX | Ascension, Assumption, Iberville, Jefferson, Plaquemines, Saint Charles and 3 more | 63 min |
| May 20, 4:05 AM CDT | Special Marine Warning | LIX | 55 min | |
| May 20, 4:18 AM CDT | Special Marine Warning | LIX | 57 min | |
| May 20, 5:03 AM CDT | Special Marine Warning | LIX | 57 min | |
| May 20, 5:33 AM CDT | Special Marine Warning | LIX | 57 min | |
| May 20, 7:00 AM CDT | Special Weather Statement | LIX | Assumption, Jefferson, Lafourche, Saint Charles, Saint James | 60 min |
| May 20, 7:39 AM CDT | Tornado Warning | LIX | Jefferson | 8 min |
| May 20, 7:42 AM CDT | Special Marine Warning | LIX | 33 min | |
| May 20, 8:27 AM CDT | Special Marine Warning | LIX | 63 min | |
| May 20, 8:37 AM CDT | Areal Flood Advisory | LIX | Ascension, Assumption, East Baton Rouge, Iberville, Lafourche, Livingston and 3 more | 52 min |
| May 20, 8:58 AM CDT | Tornado Warning | LIX | East Feliciana | 13 min |
| May 20, 9:29 AM CDT | Flash Flood Warning | LIX | Ascension, East Baton Rouge, Iberville, Livingston, West Baton Rouge | 9 hr |
| May 20, 9:45 AM CDT | Flash Flood Warning | LIX | East Baton Rouge, East Feliciana, Saint Helena, West Feliciana | 11 hr |
| May 20, 10:04 AM CDT | Flash Flood Warning | LIX | Ascension, Assumption, Iberville, Lafourche, Livingston, Saint James and 1 more | 13 hr |
| May 20, 11:22 AM CDT | Special Marine Warning | LIX | 38 min | |
| May 20, 11:26 AM CDT | Severe Thunderstorm Warning | LIX | East Baton Rouge, East Feliciana, Livingston, Saint Helena | 94 min |
| May 20, 2:16 PM CDT | River Flood Warning | LIX | East Baton Rouge, Livingston | 68 hr |
| May 20, 2:22 PM CDT | River Flood Warning | LIX | Ascension, Livingston | 4 days |
| May 20, 2:33 PM CDT | Special Marine Warning | LIX | 57 min | |
| May 20, 2:40 PM CDT | River Flood Warning | LIX | East Baton Rouge | 61 hr |
| May 20, 3:29 PM CDT | Special Marine Warning | LIX | 61 min | |
| May 20, 3:56 PM CDT | Gale Warning | LIX | 19 hr | |
| May 20, 3:56 PM CDT | Small Craft Advisory | LIX | 60 hr | |
| May 20, 3:56 PM CDT | Wind Advisory | LIX | Orleans, Saint Bernard, Saint John the Baptist, Saint Tammany | 27 hr |
| May 20, 4:30 PM CDT | Special Marine Warning | LIX | 90 min | |
| May 20, 4:58 PM CDT | Special Weather Statement | LIX | Lafourche, Terrebonne | 47 min |
| May 20, 5:16 PM CDT | Areal Flood Advisory | LIX | Assumption, Jefferson, Lafourche, Terrebonne | 3 hr |
| May 20, 6:42 PM CDT | Flash Flood Warning | LIX | Ascension, East Baton Rouge, Iberville, Livingston, Saint Helena, West Baton Rouge | 4 hr |
Nearby
Severe Thunderstorm Warnings in Louisiana, 2021Every severe thunderstorm warning in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.