Alert archive / Louisiana / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 84, NWS New Orleans, LA

April 24, 2021Saint Tammany Parish, Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at Apr 24, 2021, 4:06 AM CDT for Saint Tammany Parish, Louisiana. It was in force for 24 min. 1 report 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 24, 2021, 4:06 AM CDT (09:06 UTC)
Expired: Apr 24, 2021, 4:30 AM CDT
In force: 24 min
Issued by: NWS New Orleans, LA
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

County Saint Tammany Parish, LA

What was reported inside it

Time	Report	Where	Remark
Apr 24, 4:18 AM CDT	TSTM WND DMG	3 Nne Slidell, LA	TREE SNAPPED HALFWAY UP TRUNK.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 9.1 hours before the alert went out and 1 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 873 m above ground
0-6 km bulk shear: 62 kt
0-1 km storm-relative helicity: 156 m²/s²
0-3 km storm-relative helicity: 263 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

705 
WUUS54 KLIX 240906
SVRLIX
LAC103-240930-
/O.NEW.KLIX.SV.W.0084.210424T0906Z-210424T0930Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service New Orleans LA
406 AM CDT Sat Apr 24 2021

The National Weather Service in New Orleans has issued a

* Severe Thunderstorm Warning for...
  Southeastern St. Tammany Parish in southeastern Louisiana...

* Until 430 AM CDT.

* At 405 AM CDT, a severe thunderstorm was located near Lacombe, or
  near Slidell, moving east at 45 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Slidell, Pearl River, Lacombe, Pearlington and Slidell Airport. 

This includes the following Interstates...
 Interstate 10 in Louisiana between mile markers 260 and 273.
 Interstate 12 between mile markers 72 and 84.
 Interstate 59 in Louisiana between mile markers 1 and 10.

65 mph wind reported at Mandeville. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 900 AM CDT for southern
Mississippi.

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3036 8966 3034 8963 3029 8964 3023 8962
      3018 8957 3018 8955 3015 8958 3016 8962
      3017 8960 3017 8972 3022 8985 3025 8987
      3026 8998 3042 8996 3046 8969
TIME...MOT...LOC 0905Z 271DEG 40KT 3032 8988 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH
 
$$

CAB

1 follow-up statement

641 
WWUS54 KLIX 240935
SVSLIX

Severe Weather Statement
National Weather Service New Orleans LA
435 AM CDT Sat Apr 24 2021

LAC103-240945-
/O.EXP.KLIX.SV.W.0084.000000T0000Z-210424T0930Z/
St. Tammany LA-
435 AM CDT Sat Apr 24 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN ST. TAMMANY
PARISH HAS EXPIRED...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning has
been allowed to expire.

A Tornado Watch remains in effect until 900 AM CDT for southern
Mississippi.

LAT...LON 3036 8966 3034 8963 3029 8964 3023 8962
      3018 8957 3018 8955 3015 8958 3016 8962
      3017 8960 3017 8972 3022 8985 3025 8987
      3026 8998 3042 8996 3046 8969
TIME...MOT...LOC 0935Z 265DEG 44KT 3027 8960 

$$

CAB

The office that day

Everything else NWS New Orleans, LA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 23, 9:28 PM CDT	Severe Thunderstorm Warning	LIX	Tangipahoa, Washington	47 min
Apr 23, 10:12 PM CDT	Special Weather Statement	LIX	East Baton Rouge, West Baton Rouge	33 min
Apr 23, 10:34 PM CDT	Severe Thunderstorm Warning	LIX	East Baton Rouge, Livingston, West Baton Rouge	26 min
Apr 23, 10:47 PM CDT	Tornado Warning	LIX	East Baton Rouge, Livingston, West Baton Rouge	28 min
Apr 23, 11:14 PM CDT	Severe Thunderstorm Warning	LIX	Livingston, Saint Helena, Tangipahoa	31 min
Apr 23, 11:46 PM CDT	Severe Thunderstorm Warning	LIX	Saint Tammany, Tangipahoa, Washington	44 min
Apr 24, 12:28 AM CDT	Severe Thunderstorm Warning	LIX	Washington	47 min
Apr 24, 12:56 AM CDT	Special Weather Statement	LIX	East Baton Rouge, East Feliciana, Pointe Coupee, West Baton Rouge, West Feliciana	64 min
Apr 24, 1:36 AM CDT	Special Weather Statement	LIX	Livingston	24 min
Apr 24, 1:43 AM CDT	Special Weather Statement	LIX	Washington	32 min
Apr 24, 1:50 AM CDT	Severe Thunderstorm Warning	LIX	Ascension, East Baton Rouge, Iberville, Livingston, Saint Helena, Tangipahoa	25 min
Apr 24, 2:17 AM CDT	Special Weather Statement	LIX	Ascension, Livingston, Tangipahoa, Washington	43 min
Apr 24, 3:00 AM CDT	Special Weather Statement	LIX	Assumption, Saint James, Saint John the Baptist, Saint Tammany	60 min
Apr 24, 3:02 AM CDT	Special Marine Warning	LIX		58 min
Apr 24, 3:21 AM CDT	Special Weather Statement	LIX	Ascension, East Baton Rouge, Livingston, Saint John the Baptist, Tangipahoa	39 min
Apr 24, 3:30 AM CDT	Severe Thunderstorm Warning	LIX	Ascension, Livingston, Saint James, Saint John the Baptist, Tangipahoa	30 min
Apr 24, 3:55 AM CDT	Special Marine Warning	LIX		65 min
Apr 24, 3:59 AM CDT	Special Weather Statement	LIX	Orleans, Saint Charles	61 min
Apr 24, 5:36 AM CDT	Special Weather Statement	LIX	Saint Tammany	39 min
Apr 24, 9:44 AM CDT	River Flood Warning	LIX	Tangipahoa	3 days
Apr 24, 9:46 AM CDT	River Flood Warning	LIX	Saint Tammany	48 hr
Apr 24, 11:12 AM CDT	River Flood Warning	LIX	Saint Tammany	21 days
Apr 24, 11:12 AM CDT	River Flood Warning	LIX	Washington	72 hr

Nearby

Severe Thunderstorm Warnings in Louisiana, 2021 Every 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.