Alert archive / Louisiana / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 46, NWS New Orleans, LA
NWS New Orleans, LA issued this severe thunderstorm warning at Apr 10, 2021, 4:58 AM CDT for 6 parishes in Louisiana. It was in force for 47 min. 3 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Apr 10, 2021, 4:58 AM CDT (09:58 UTC)
- Expired
- Apr 10, 2021, 5:45 AM CDT
- In force
- 47 min
- Issued by
- NWS New Orleans, LA
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 70.0 mph
Counties Jefferson Parish, LA, Orleans Parish, LA, Plaquemines Parish, LA, Saint Bernard Parish, LA, Saint Charles Parish, LA, Saint Tammany Parish, LA
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Apr 10, 5:01 AM CDT | MARINE TSTM WIND 45 | Eden Isle, LA | WEATHERFLOW SITE MEASURED A WIND GUST OF 45MPH. |
| Apr 10, 5:10 AM CDT | TSTM WND DMG | 1 E Slidell, LA | FIRE CHIEF REPORTS TREES AND POWERLINES DOWN ON THE EAST SIDE OF ST TAMMANY PARISH. |
| Apr 10, 5:10 AM CDT | TSTM WND DMG | 1 E Slidell, LA | FIRE DEPARTMENT REPORTS TREES AND POWERLINES DOWN ON THE EAST SIDE OF ST. TAMMANY PARISH. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Apr 10, 12:16 AM CDT | Tornado Watch | SPC | 7 hr |
The nearest sounding before it
Slidell Radar S, LA (KSIL), launched 00:00Z, 10.0 hours before the alert went out and 27 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
- 2977 J/kg
- Mixed-layer CIN
- -20 J/kg
- Mixed-layer LCL
- 599 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 243 m²/s²
- 0-3 km storm-relative helicity
- 269 m²/s²
- Significant tornado parameter
- 3.4
- Supercell composite
- 18.1
The text
As transmitted.
156
WUUS54 KLIX 100958
SVRLIX
LAC051-071-075-087-089-103-101045-
/O.NEW.KLIX.SV.W.0046.210410T0958Z-210410T1045Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service New Orleans LA
458 AM CDT Sat Apr 10 2021
The National Weather Service in New Orleans has issued a
* Severe Thunderstorm Warning for...
St. Bernard Parish in southeastern Louisiana...
Eastern St. Charles Parish in southeastern Louisiana...
Orleans Parish in southeastern Louisiana...
Southeastern St. Tammany Parish in southeastern Louisiana...
Northwestern Jefferson Parish in southeastern Louisiana...
Northwestern Plaquemines Parish in southeastern Louisiana...
* Until 545 AM CDT.
* At 458 AM CDT, severe thunderstorms were located along a line
extending from 8 miles north of New Orleans to 7 miles northwest of
Metairie, moving southeast at 35 mph.
HAZARD...70 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect considerable tree damage. Damage is likely to
mobile homes, roofs, and outbuildings.
* Locations impacted include...
New Orleans, Slidell, Chalmette, Avondale, Metairie, Marrero,
Harvey, East New Orleans, Timberlane, Belle Chasse, Hahnville,
Jefferson, Gretna, Harahan, Westwego, Jean Lafitte, Lake Catherine,
Luling, Poydras and River Ridge.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 700 AM CDT for southeastern
Louisiana...and southern Mississippi.
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3004 9045 3003 9003 3015 8988 3010 8981
3018 8968 3026 8991 3033 8969 3016 8957
3002 8972 3002 8984 2994 8984 2996 8973
2987 8962 3004 8949 2985 8936 2969 9027
TIME...MOT...LOC 0958Z 321DEG 30KT 3019 8988 3008 9026
HAIL...<.75IN
WIND...70MPH
$$
MEFFER1 follow-up statement
587
WWUS54 KLIX 101029
SVSLIX
Severe Weather Statement
National Weather Service New Orleans LA
529 AM CDT Sat Apr 10 2021
LAC089-103-101039-
/O.CAN.KLIX.SV.W.0046.000000T0000Z-210410T1045Z/
St. Charles LA-St. Tammany LA-
529 AM CDT Sat Apr 10 2021
...THE SEVERE THUNDERSTORM WARNING FOR EASTERN ST. CHARLES AND
SOUTHEASTERN ST. TAMMANY PARISHES IS CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
LAT...LON 2973 9008 3002 9012 3006 8997 3015 8988
3010 8981 3017 8969 3015 8963 3007 8969
3006 8973 3002 8972 3004 8982 3002 8984
2994 8984 2993 8980 2996 8973 2992 8975
2988 8972 2987 8962 3004 8949 2985 8936
TIME...MOT...LOC 1029Z 321DEG 36KT 2997 8968 2986 9006
$$
LAC051-071-075-087-101045-
/O.CON.KLIX.SV.W.0046.000000T0000Z-210410T1045Z/
St. Bernard LA-Orleans LA-Jefferson LA-Plaquemines LA-
529 AM CDT Sat Apr 10 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 AM CDT
FOR ST. BERNARD...ORLEANS...NORTH CENTRAL JEFFERSON AND NORTHWESTERN
PLAQUEMINES PARISHES...
At 529 AM CDT, severe thunderstorms were located along a line
extending from 6 miles north of Shell Beach to Woodmere, moving
southeast at 40 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
New Orleans, Chalmette, Harvey, East New Orleans, Timberlane, Belle
Chasse, Marrero, Gretna, Jean Lafitte, Lake Catherine, Woodmere,
Violet, Terrytown, Meraux, Poydras, Shell Beach, Arabi, Estelle and
Lakefront Airport.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 2973 9008 3002 9012 3006 8997 3015 8988
3010 8981 3017 8969 3015 8963 3007 8969
3006 8973 3002 8972 3004 8982 3002 8984
2994 8984 2993 8980 2996 8973 2992 8975
2988 8972 2987 8962 3004 8949 2985 8936
TIME...MOT...LOC 1029Z 321DEG 36KT 2997 8968 2986 9006
HAIL...<.75IN
WIND...60MPH
$$
MEFFERThe office that day
Everything else NWS New Orleans, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 10, 12:41 AM CDT | Severe Thunderstorm Warning | LIX | Saint Tammany, Washington | 11 min |
| Apr 10, 1:07 AM CDT | Special Marine Warning | LIX | 22 min | |
| Apr 10, 1:40 AM CDT | Special Marine Warning | LIX | 20 min | |
| Apr 10, 1:45 AM CDT | Tornado Warning | LIX | Pointe Coupee, West Feliciana | 45 min |
| Apr 10, 1:52 AM CDT | Special Weather Statement | LIX | Saint Tammany | 38 min |
| Apr 10, 2:01 AM CDT | Severe Thunderstorm Warning | LIX | Saint Tammany, Washington | 29 min |
| Apr 10, 2:05 AM CDT | Tornado Warning | LIX | Saint Tammany | 10 min |
| Apr 10, 2:28 AM CDT | Severe Thunderstorm Warning | LIX | Pointe Coupee, West Feliciana | 47 min |
| Apr 10, 2:48 AM CDT | Severe Thunderstorm Warning | LIX | East Baton Rouge, East Feliciana, Saint Helena, West Feliciana | 39 min |
| Apr 10, 2:58 AM CDT | Severe Thunderstorm Warning | LIX | Saint Helena, Tangipahoa | 35 min |
| Apr 10, 3:20 AM CDT | Severe Thunderstorm Warning | LIX | East Baton Rouge, East Feliciana, Pointe Coupee, West Baton Rouge, West Feliciana | 33 min |
| Apr 10, 3:25 AM CDT | Special Weather Statement | LIX | Saint Helena, Tangipahoa | 65 min |
| Apr 10, 3:26 AM CDT | Special Weather Statement | LIX | Ascension, Assumption, Livingston, Saint James, Saint John the Baptist | 64 min |
| Apr 10, 3:38 AM CDT | Special Marine Warning | LIX | 67 min | |
| Apr 10, 3:59 AM CDT | Special Weather Statement | LIX | East Baton Rouge | 46 min |
| Apr 10, 4:16 AM CDT | Special Marine Warning | LIX | 59 min | |
| Apr 10, 4:23 AM CDT | Tornado Warning | LIX | Saint James, Saint John the Baptist | 19 min |
| Apr 10, 4:40 AM CDT | Flash Flood Warning | LIX | Saint Tammany, Tangipahoa, Washington | 3 hr |
| Apr 10, 4:47 AM CDT | Special Weather Statement | LIX | Ascension, Assumption, Orleans, Saint Charles, Saint James, Saint John the Baptist and 1 more | 58 min |
| Apr 10, 5:16 AM CDT | Flash Flood Warning | LIX | Orleans | 3 hr |
| Apr 10, 5:23 AM CDT | Special Marine Warning | LIX | 67 min | |
| Apr 10, 5:24 AM CDT | Flash Flood Warning | LIX | Saint Bernard | 3 hr |
| Apr 10, 5:46 AM CDT | Special Weather Statement | LIX | Assumption, Jefferson, Orleans, Saint Charles | 59 min |
| Apr 10, 6:07 AM CDT | Areal Flood Advisory | LIX | Jefferson, Lafourche, Orleans, Saint Charles, Saint John the Baptist, Terrebonne | 2 hr |
| Apr 10, 6:24 AM CDT | Special Marine Warning | LIX | 96 min | |
| Apr 10, 6:29 AM CDT | Flash Flood Warning | LIX | Lafourche, Terrebonne | 89 min |
| Apr 10, 6:33 AM CDT | Flash Flood Warning | LIX | Jefferson, Plaquemines | 105 min |
| Apr 10, 6:42 AM CDT | Special Weather Statement | LIX | Jefferson, Lafourche, Plaquemines, Terrebonne | 78 min |
| Apr 10, 7:13 AM CDT | Special Marine Warning | LIX | 92 min | |
| Apr 10, 7:53 AM CDT | Special Marine Warning | LIX | 97 min | |
| Apr 10, 8:52 AM CDT | River Flood Warning | LIX | Saint Tammany | 10 days |
| Apr 10, 8:52 AM CDT | River Flood Warning | LIX | Saint Tammany | 24 hr |
| Apr 10, 8:55 AM CDT | River Flood Warning | LIX | Saint Tammany | 25 hr |
| Apr 10, 9:49 AM CDT | River Flood Warning | LIX | Washington | 33 hr |
| Apr 10, 11:15 AM CDT | Special Weather Statement | LIX | Terrebonne | 30 min |
| Apr 10, 11:51 AM CDT | Special Weather Statement | LIX | Lafourche | 39 min |
| Apr 10, 12:28 PM CDT | Special Weather Statement | LIX | Jefferson | 32 min |
| Apr 10, 5:46 PM CDT | River Flood Warning | LIX | Saint Helena | 26 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive.