Alert archive / Louisiana / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 91, NWS New Orleans, LA
NWS New Orleans, LA issued this severe thunderstorm warning at May 4, 2021, 3:33 PM CDT for 6 parishes in Louisiana; 4 counties in Mississippi. It was in force for 42 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 4, 2021, 3:33 PM CDT (20:33 UTC)
- Expired
- May 4, 2021, 4:15 PM CDT
- In force
- 42 min
- Issued by
- NWS New Orleans, LA
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties East Baton Rouge Parish, LA, East Feliciana Parish, LA, Saint Helena Parish, LA, Tangipahoa Parish, LA, Washington Parish, LA, West Feliciana Parish, LA, Amite County, MS, Pike County, MS, Walthall County, MS, Wilkinson County, MS
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| May 4, 10:52 AM CDT | Tornado Watch | SPC | 7 hr |
| May 4, 3:31 PM CDT | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
Slidell Radar S, LA (KSIL), launched 12:00Z, 8.6 hours before the alert went out and 117 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
- 2523 J/kg
- Mixed-layer CIN
- -43 J/kg
- Mixed-layer LCL
- 594 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 112 m²/s²
- 0-3 km storm-relative helicity
- 192 m²/s²
- Significant tornado parameter
- 1.1
- Supercell composite
- 7.4
The text
As transmitted.
476
WUUS54 KLIX 042033
SVRLIX
LAC033-037-091-105-117-125-MSC005-113-147-157-042115-
/O.NEW.KLIX.SV.W.0091.210504T2033Z-210504T2115Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service New Orleans LA
333 PM CDT Tue May 4 2021
The National Weather Service in New Orleans has issued a
* Severe Thunderstorm Warning for...
St. Helena Parish in southeastern Louisiana...
Southeastern West Feliciana Parish in southeastern Louisiana...
East Feliciana Parish in southeastern Louisiana...
Northern Tangipahoa Parish in southeastern Louisiana...
Northeastern East Baton Rouge Parish in southeastern Louisiana...
Northwestern Washington Parish in southeastern Louisiana...
Walthall County in southern Mississippi...
Pike County in southern Mississippi...
Southeastern Wilkinson County in southern Mississippi...
Amite County in southern Mississippi...
* Until 415 PM CDT.
* At 333 PM CDT, severe thunderstorms were located along a line
extending from near Bogue Chitto to near Zachary, moving east at 50
mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage
to roofs, siding, and trees.
* Locations impacted include...
Zachary, Mccomb, Jackson, Clinton, Liberty, Greensburg, Amite,
Amite City, Magnolia, Kentwood, Summit, Centreville, Tylertown,
Roseland, Slaughter, Wilson, Osyka, Norwood, Montpelier and
Smithdale.
This includes the following Interstates...
Interstate 55 in Louisiana between mile markers 45 and 66.
Interstate 55 in Mississippi between mile markers 1 and 24.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 600 PM CDT for southeastern
Louisiana...and southern Mississippi. A Tornado Watch also remains in
effect until 1000 PM CDT for southeastern Louisiana...and southern
Mississippi.
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3133 9008 3133 9004 3118 9003 3117 9000
3114 9000 3068 9039 3070 9135 3072 9135
3135 9085 3135 9011
TIME...MOT...LOC 2033Z 259DEG 45KT 3141 9050 3068 9111
HAIL...1.00IN
WIND...60MPH
$$
MSWThe office that day
Everything else NWS New Orleans, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 4, 4:11 AM CDT | Flash Flood Watch | LIX | Assumption, East Baton Rouge, East Feliciana, Iberville, Orleans, Pointe Coupee and 9 more | 33 hr |
| May 4, 9:54 AM CDT | River Flood Warning | LIX | Tangipahoa | 21 days |
| May 4, 2:26 PM CDT | Severe Thunderstorm Warning | LIX | Pointe Coupee, West Feliciana | 64 min |
| May 4, 2:58 PM CDT | Severe Thunderstorm Warning | LIX | East Feliciana, Pointe Coupee, West Feliciana | 47 min |
| May 4, 4:10 PM CDT | Severe Thunderstorm Warning | LIX | East Baton Rouge, East Feliciana, Saint Helena, Saint Tammany, Tangipahoa, Washington | 65 min |
| May 4, 4:24 PM CDT | Areal Flood Advisory | LIX | East Baton Rouge, East Feliciana, Livingston, Pointe Coupee, Saint Helena, West Baton Rouge and 1 more | 97 min |
| May 4, 4:37 PM CDT | Areal Flood Advisory | LIX | East Baton Rouge, East Feliciana, Livingston, Saint Helena, Tangipahoa, Washington | 106 min |
| May 4, 4:56 PM CDT | Special Weather Statement | LIX | Tangipahoa, Washington | 34 min |
| May 4, 5:32 PM CDT | Special Weather Statement | LIX | Tangipahoa, Washington | 43 min |
| May 4, 2:15 PM CDT | Special Weather Statement | LIX | Wilkinson | 30 min |
Nearby
Severe Thunderstorm Warnings in Louisiana, 2021Severe Thunderstorm Warnings in Mississippi, 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.