Alert archive / Louisiana / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 140, NWS New Orleans, LA
NWS New Orleans, LA issued this severe thunderstorm warning at Oct 27, 2021, 4:46 PM CDT for 10 parishes in Louisiana. It was in force for 44 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
- Oct 27, 2021, 4:46 PM CDT (21:46 UTC)
- Expired
- Oct 27, 2021, 5:30 PM CDT
- In force
- 44 min
- Issued by
- NWS New Orleans, LA
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Ascension Parish, LA, Assumption Parish, LA, East Baton Rouge Parish, LA, Iberville Parish, LA, Lafourche Parish, LA, Livingston Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Tangipahoa Parish, LA, Terrebonne Parish, LA
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Oct 27, 1:53 PM CDT | Tornado Watch | SPC | 8 hr |
The nearest sounding before it
Slidell Radar S, LA (KSIL), launched 12:00Z, 9.8 hours before the alert went out and 104 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1792 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- 186 m²/s²
- 0-3 km storm-relative helicity
- 274 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
410
WUUS54 KLIX 272146
SVRLIX
LAC005-007-033-047-057-063-093-095-105-109-272230-
/O.NEW.KLIX.SV.W.0140.211027T2146Z-211027T2230Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service New Orleans LA
446 PM CDT Wed Oct 27 2021
The National Weather Service in New Orleans has issued a
* Severe Thunderstorm Warning for...
Northwestern St. John The Baptist Parish in southeastern
Louisiana...
Ascension Parish in southeastern Louisiana...
St. James Parish in southeastern Louisiana...
North central Terrebonne Parish in southeastern Louisiana...
Livingston Parish in southeastern Louisiana...
Southeastern Iberville Parish in southeastern Louisiana...
Northwestern Lafourche Parish in southeastern Louisiana...
Southwestern Tangipahoa Parish in southeastern Louisiana...
South central East Baton Rouge Parish in southeastern Louisiana...
Assumption Parish in southeastern Louisiana...
* Until 530 PM CDT.
* At 445 PM CDT, severe thunderstorms were located along a line
extending from near Denham Springs to Port Vincent to near Bayou
Geneve, moving northeast at 60 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Locations impacted include...
Hammond, Thibodaux, Gonzales, Donaldsonville, Napoleonville,
Reserve, St. Gabriel, Ponchatoula, Walker, Gramercy, Lutcher, White
Castle, Livingston, Sorrento, French Settlement, Albany, Port
Vincent, Springfield, Schriever and Geismar.
This includes the following Interstates...
Interstate 10 in Louisiana between mile markers 167 and 202.
Interstate 12 between mile markers 14 and 47.
Interstate 55 in Louisiana between mile markers 20 and 38.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Squall lines can produce brief tornadoes and straight-line wind
damage. Although a tornado is not immediately likely, it is best to
move to an interior room on the lowest floor of a building. These
storms may cause injury and property damage.
A Tornado Watch remains in effect until 1000 PM CDT for southeastern
Louisiana.
&&
LAT...LON 3020 9115 3032 9107 3060 9077 3065 9059
3049 9033 3032 9043 3034 9049 3030 9056
3019 9060 3017 9057 3017 9051 2998 9062
2955 9097 2965 9111 2981 9110 2985 9119
TIME...MOT...LOC 2145Z 229DEG 51KT 3045 9098 3032 9086 2977 9107
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
JRK1 follow-up statement
229
WWUS54 KLIX 272208
SVSLIX
Severe Weather Statement
National Weather Service New Orleans LA
508 PM CDT Wed Oct 27 2021
LAC033-047-272217-
/O.CAN.KLIX.SV.W.0140.000000T0000Z-211027T2230Z/
Iberville LA-East Baton Rouge LA-
508 PM CDT Wed Oct 27 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN IBERVILLE AND
SOUTH CENTRAL EAST BATON ROUGE PARISHES IS CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
A Tornado Watch remains in effect until 1000 PM CDT for southeastern
Louisiana.
LAT...LON 3025 9098 3034 9095 3034 9090 3037 9094
3047 9090 3064 9057 3048 9033 3032 9043
3034 9049 3030 9056 3019 9060 3017 9051
2998 9062 2955 9097 2965 9110
TIME...MOT...LOC 2207Z 244DEG 28KT 3040 9086 3029 9077 2999 9089 2967
9094
$$
LAC005-007-057-063-093-095-105-109-272230-
/O.CON.KLIX.SV.W.0140.000000T0000Z-211027T2230Z/
St. John The Baptist LA-Ascension LA-St. James LA-Terrebonne LA-
Livingston LA-Lafourche LA-Tangipahoa LA-Assumption LA-
508 PM CDT Wed Oct 27 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM CDT
FOR NORTHWESTERN ST. JOHN THE BAPTIST...ASCENSION...ST. JAMES...NORTH
CENTRAL TERREBONNE...LIVINGSTON...NORTHWESTERN LAFOURCHE...
SOUTHWESTERN TANGIPAHOA AND EASTERN ASSUMPTION PARISHES...
At 507 PM CDT, severe thunderstorms were located along a line
extending from near Port Vincent to near French Settlement to near
Convent to 7 miles southwest of Schriever, moving northeast at 30
mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Hammond, Thibodaux, Gonzales, Donaldsonville, Napoleonville, Reserve,
Ponchatoula, Walker, Gramercy, Lutcher, Livingston, Sorrento, French
Settlement, Albany, Port Vincent, Springfield, Schriever, Garyville,
Supreme and Natalbany.
This includes the following Interstates...
Interstate 10 in Louisiana between mile markers 175 and 202.
Interstate 12 between mile markers 14 and 47.
Interstate 55 in Louisiana between mile markers 19 and 38.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 1000 PM CDT for southeastern
Louisiana.
Squall lines can produce brief tornadoes and straight-line wind
damage. Although a tornado is not immediately likely, it is best to
move to an interior room on the lowest floor of a building. These
storms may cause serious injury and significant property damage.
&&
LAT...LON 3025 9098 3034 9095 3034 9090 3037 9094
3047 9090 3064 9057 3048 9033 3032 9043
3034 9049 3030 9056 3019 9060 3017 9051
2998 9062 2955 9097 2965 9110
TIME...MOT...LOC 2207Z 244DEG 28KT 3040 9086 3029 9077 2999 9089 2967
9094
TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
JRKThe office that day
Everything else NWS New Orleans, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 27, 1:47 PM CDT | Tornado Warning | LIX | East Baton Rouge, East Feliciana | 43 min |
| Oct 27, 1:48 PM CDT | Tornado Warning | LIX | East Feliciana, West Feliciana | 42 min |
| Oct 27, 1:51 PM CDT | Special Marine Warning | LIX | 41 min | |
| Oct 27, 2:03 PM CDT | Tornado Warning | LIX | Livingston, Tangipahoa | 42 min |
| Oct 27, 2:16 PM CDT | Severe Thunderstorm Warning | LIX | Iberville, Pointe Coupee, West Feliciana | 59 min |
| Oct 27, 3:10 PM CDT | Severe Thunderstorm Warning | LIX | East Baton Rouge, East Feliciana, Iberville, Pointe Coupee, West Baton Rouge, West Feliciana | 50 min |
| Oct 27, 3:17 PM CDT | Special Marine Warning | LIX | 28 min | |
| Oct 27, 3:19 PM CDT | Tornado Warning | LIX | East Feliciana, West Feliciana | 26 min |
| Oct 27, 3:22 PM CDT | Special Marine Warning | LIX | 53 min | |
| Oct 27, 3:56 PM CDT | Severe Thunderstorm Warning | LIX | East Baton Rouge, East Feliciana, Iberville, Livingston, Saint Helena, West Baton Rouge | 49 min |
| Oct 27, 4:06 PM CDT | Severe Thunderstorm Warning | LIX | Ascension, Assumption, East Baton Rouge, Iberville, Livingston, Saint James and 1 more | 39 min |
| Oct 27, 4:54 PM CDT | Areal Flood Advisory | LIX | Livingston, Saint Tammany, Tangipahoa, Washington | 3 hr |
| Oct 27, 4:59 PM CDT | Special Marine Warning | LIX | 91 min | |
| Oct 27, 5:19 PM CDT | Severe Thunderstorm Warning | LIX | Saint Tammany, Washington | 26 min |
| Oct 27, 5:22 PM CDT | Severe Thunderstorm Warning | LIX | Ascension, Assumption, Lafourche, Livingston, Saint Charles, Saint James and 2 more | 38 min |
| Oct 27, 5:26 PM CDT | Special Marine Warning | LIX | 94 min | |
| Oct 27, 5:28 PM CDT | Flash Flood Warning | LIX | Saint Tammany, Tangipahoa, Washington | 3 hr |
| Oct 27, 5:56 PM CDT | Severe Thunderstorm Warning | LIX | Jefferson, Lafourche, Orleans, Plaquemines, Saint Bernard, Saint Charles and 2 more | 49 min |
| Oct 27, 6:10 PM CDT | Severe Thunderstorm Warning | LIX | Saint Tammany | 50 min |
| Oct 27, 6:19 PM CDT | Flash Flood Warning | LIX | Saint Tammany, Washington | 2 hr |
| Oct 27, 6:23 PM CDT | Special Marine Warning | LIX | 97 min | |
| Oct 27, 6:28 PM CDT | Tornado Warning | LIX | Jefferson, Lafourche | 32 min |
| Oct 27, 6:37 PM CDT | Special Marine Warning | LIX | 83 min | |
| Oct 27, 6:47 PM CDT | Areal Flood Advisory | LIX | Jefferson, Orleans, Saint Bernard, Saint Charles | 109 min |
| Oct 27, 6:49 PM CDT | Severe Thunderstorm Warning | LIX | Jefferson, Lafourche, Orleans, Plaquemines, Saint Bernard | 41 min |
| Oct 27, 6:53 PM CDT | Areal Flood Advisory | LIX | Saint Tammany | 3 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.