Alert archive / Louisiana / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 133, NWS New Orleans, LA

July 12, 2021Jefferson Parish, Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at Jul 12, 2021, 11:07 AM CDT for Jefferson Parish, Louisiana. It was in force for 8 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: Jul 12, 2021, 11:07 AM CDT (16:07 UTC)
Expired: Jul 12, 2021, 11:15 AM CDT
In force: 8 min
Issued by: NWS New Orleans, LA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Jefferson Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 4.1 hours before the alert went out and 58 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: 3080 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 582 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 122 m²/s²
0-3 km storm-relative helicity: 93 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

259 
WUUS54 KLIX 121607
SVRLIX
LAC051-121615-
/O.NEW.KLIX.SV.W.0133.210712T1607Z-210712T1615Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service New Orleans LA
1107 AM CDT Mon Jul 12 2021

The National Weather Service in New Orleans has issued a

* Severe Thunderstorm Warning for...
  Northwestern Jefferson Parish in southeastern Louisiana...

* Until 1115 AM CDT.

* At 1107 AM CDT, a severe thunderstorm was located near River Ridge,
  or near Metairie, moving north at 20 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Metairie, Jefferson, Harahan, River Ridge, Elmwood, Waggaman and
  New Orleans Armstrong Airport.

This includes Interstate 10 in Louisiana between mile markers 222 and
228.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 2997 9027 3005 9027 3004 9023 3003 9022
      3002 9014 2994 9020
TIME...MOT...LOC 1607Z 190DEG 16KT 3001 9024 

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

MEFFER

1 follow-up statement

797 
WWUS54 KLIX 121617
SVSLIX

Severe Weather Statement
National Weather Service New Orleans LA
1117 AM CDT Mon Jul 12 2021

LAC051-121627-
/O.EXP.KLIX.SV.W.0133.000000T0000Z-210712T1615Z/
Jefferson LA-
1117 AM CDT Mon Jul 12 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN JEFFERSON 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.  However gusty winds are still possible with
this thunderstorm.

LAT...LON 2997 9027 3005 9027 3004 9023 3003 9022
      3002 9014 2994 9020
TIME...MOT...LOC 1617Z 190DEG 16KT 3005 9023 

$$

MEFFER

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 12, 3:50 AM CDT	River Flood Warning	LIX	Saint Tammany	31 hr
Jul 12, 3:50 AM CDT	River Flood Warning	LIX	Saint Tammany	10 hr
Jul 12, 5:45 AM CDT	River Flood Warning	LIX	Saint Tammany	30 hr
Jul 12, 7:23 AM CDT	Special Weather Statement	LIX	West Feliciana	52 min
Jul 12, 8:04 AM CDT	Special Weather Statement	LIX	East Feliciana, Pointe Coupee, West Feliciana	56 min
Jul 12, 9:00 AM CDT	Special Weather Statement	LIX	East Baton Rouge, East Feliciana, Pointe Coupee, Saint Helena, West Baton Rouge, West Feliciana	30 min
Jul 12, 10:56 AM CDT	Special Marine Warning	LIX		64 min
Jul 12, 11:14 AM CDT	Special Weather Statement	LIX	Saint Tammany	46 min
Jul 12, 11:49 AM CDT	Special Weather Statement	LIX	Orleans	26 min
Jul 12, 11:56 AM CDT	Special Marine Warning	LIX		49 min
Jul 12, 12:05 PM CDT	Areal Flood Advisory	LIX	Saint Tammany	115 min
Jul 12, 12:15 PM CDT	Special Marine Warning	LIX		60 min
Jul 12, 12:23 PM CDT	Special Weather Statement	LIX	Jefferson, Lafourche	67 min
Jul 12, 1:11 PM CDT	Special Marine Warning	LIX		64 min
Jul 12, 1:43 PM CDT	Special Marine Warning	LIX		62 min
Jul 12, 2:13 PM CDT	Special Marine Warning	LIX		62 min
Jul 12, 3:11 PM CDT	Special Marine Warning	LIX		64 min
Jul 12, 4:10 PM CDT	Special Marine Warning	LIX		65 min

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; the sounding from the Mesonet's radiosonde archive.