Alert archive / Louisiana / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 174, NWS New Orleans, LA

June 20, 2023Lafourche Parish, Terrebonne Parish, Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at Jun 20, 2023, 4:27 PM CDT for Lafourche Parish, Terrebonne Parish, Louisiana. It was in force for 48 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jun 20, 2023, 4:27 PM CDT (21:27 UTC)
Expired: Jun 20, 2023, 5:15 PM CDT
In force: 48 min
Issued by: NWS New Orleans, LA
Area: Storm-based polygon
Damage threat: Considerable
Hail: 1.25 in
Wind: 70.0 mph

Counties Lafourche Parish, LA, Terrebonne Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 9.5 hours before the alert went out and 128 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: 1812 J/kg
Mixed-layer CIN: -260 J/kg
Mixed-layer LCL: 883 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 143 m²/s²
0-3 km storm-relative helicity: 176 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.6

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS New Orleans, LA wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 20, 3:56 PM CDT, 31 minutes earlier.

Area forecast discussion, Jun 20, 3:56 PM CDT, 31 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

In the hours before

Special weather statement, Jun 20, 1:46 PM CDT, 2 hours 41 minutes before

Special Weather Statement
National Weather Service New Orleans LA
146 PM CDT Tue Jun 20 2023

LAZ069-070-090-201915-
Central Plaquemines LA-Lower Plaquemines LA-Lower St. Bernard LA-
146 PM CDT Tue Jun 20 2023

...Strong thunderstorms will impact portions of central St. Bernard
and northwestern Plaquemines Parishes through 215 PM CDT...

At 146 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from 17 miles east of Shell Beach to 8 miles north
of Pointe A La Hache. Movement was east at 15 mph.

HAZARD...Winds in excess of 40 mph and penny size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

These storms will remain over mainly rural areas of central St.
Bernard and northwestern Plaquemines Parishes.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 2975 8994 2991 8946 2997 8938 2997 8936
      2993 8935 2989 8921 2983 8926 2974 8924
      2973 8928 2976 8938 2965 8941 2961 8950
      2963 8960 2959 8961 2959 8967 2954 8963
      2952 8966
TIME...MOT...LOC 1846Z 288DEG 13KT 2983 8940 2970 8976

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...40 MPH

TJS

Special weather statement, Jun 20, 1:55 PM CDT, 2 hours 32 minutes before

Special Weather Statement
National Weather Service New Orleans LA
155 PM CDT Tue Jun 20 2023

LAZ064-069-070-090-201930-
Central Plaquemines LA-Lower Plaquemines LA-Upper St. Bernard LA-
Lower St. Bernard LA-
155 PM CDT Tue Jun 20 2023

...A strong thunderstorm will impact portions of west central St.
Bernard and northwestern Plaquemines Parishes through 230 PM CDT...

At 152 PM CDT, Doppler radar was tracking a strong thunderstorm near
Poydras, or near Belle Chasse, moving east at 20 mph.

HAZARD...Wind gusts up to 50 mph and penny size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Belle Chasse, Poydras and Violet.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Frequent cloud to ground lightning is occurring with this storm.
Lightning strikes with these storms have occurred farther than 25
miles away. Do not wait for the storm itself to arrive to take
shelter. If thunder roars, go indoors.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 2981 9000 2988 8996 2988 8993 2987 8992
      2988 8991 2987 8985 2981 8965 2967 8983
TIME...MOT...LOC 1852Z 289DEG 17KT 2982 8991

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...50 MPH

JRK

Local storm report, Jun 20, 1:56 PM CDT, 2 hours 31 minutes before

Preliminary Local Storm Report
National Weather Service New Orleans LA
156 PM CDT Tue Jun 20 2023

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0115 PM     Flood            Pass Christian          30.32N 89.24W
06/20/2023                   Harrison           MS   Trained Spotter

            Street Flooding around the Pass
            Christian/Long Beach line, .1 MI N of US-90.
            Also hail up to .5 inches.

&&

Special weather statement, Jun 20, 2:14 PM CDT, 2 hours 13 minutes before

Special Weather Statement
National Weather Service New Orleans LA
214 PM CDT Tue Jun 20 2023

MSZ084-085-087-088-201945-
Southern Harrison MS-Northern Jackson MS-Southern Jackson MS-
Northern Harrison MS-
214 PM CDT Tue Jun 20 2023

...A strong thunderstorm will impact portions of southeastern
Harrison and southwestern Jackson Counties through 245 PM CDT...

At 214 PM CDT, Doppler radar was tracking a strong thunderstorm near
Biloxi, moving southeast at 20 mph.

HAZARD...Winds in excess of 40 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Gulfport, Biloxi, Ocean Springs, St. Martin, Gautier, D'iberville,
Latimer, Gulf Hills, Gulf Park Estates and Gulfport Airport.

This includes the following Interstates...
 Interstate 10 in Mississippi between mile markers 35 and 59.
 Interstate 110 in Mississippi between mile markers 1 and 4.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3033 8859 3034 8865 3032 8873 3035 8879
      3034 8883 3036 8887 3036 8901 3035 8905
      3049 8912 3063 8891 3033 8857
TIME...MOT...LOC 1914Z 327DEG 19KT 3050 8897

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH

TJS

Local storm report, Jun 20, 2:21 PM CDT, 2 hours 6 minutes before

Preliminary Local Storm Report
National Weather Service New Orleans LA
221 PM CDT Tue Jun 20 2023

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0115 PM     Tstm Wnd Dmg     3 W Long Beach          30.36N 89.21W
06/20/2023                   Harrison           MS   Dept of Highways

            Reported tree across or on Pineville Rd
            between Espy Ave and Menge Ave.

&&

ABS

Local storm report, Jun 20, 3:43 PM CDT, 44 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 19, 7:07 PM CDT	Special Marine Warning	LIX		113 min
Jun 19, 7:52 PM CDT	Special Marine Warning	LIX		2 hr
Jun 19, 7:58 PM CDT	Special Weather Statement	LIX	Washington	32 min
Jun 19, 8:24 PM CDT	Areal Flood Advisory	LIX	Orleans, Saint Tammany	2 hr
Jun 19, 8:27 PM CDT	Special Weather Statement	LIX	Washington	33 min
Jun 19, 8:38 PM CDT	Tornado Warning	LIX	Saint Tammany	52 min
Jun 19, 8:46 PM CDT	Severe Thunderstorm Warning	LIX	Saint Tammany	44 min
Jun 19, 8:51 PM CDT	Special Marine Warning	LIX		114 min
Jun 19, 9:00 PM CDT	Special Weather Statement	LIX	Washington	30 min
Jun 19, 9:10 PM CDT	Flash Flood Warning	LIX	Saint Tammany	3 hr
Jun 19, 9:16 PM CDT	Special Marine Warning	LIX		59 min
Jun 19, 9:19 PM CDT	Tornado Warning	LIX	Saint Tammany	41 min
Jun 19, 9:24 PM CDT	Special Marine Warning	LIX		66 min
Jun 19, 9:27 PM CDT	Severe Thunderstorm Warning	LIX	Jefferson, Orleans	48 min
Jun 19, 9:36 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LIX	Saint Tammany	24 min
Jun 19, 9:45 PM CDT	Severe Thunderstorm Warning	LIX	Orleans, Saint Tammany	60 min
Jun 19, 9:55 PM CDT	Flash Flood Warning	LIX	Saint Tammany, Tangipahoa	3 hr
Jun 19, 10:02 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LIX	Jefferson, Orleans, Plaquemines, Saint Bernard	43 min
Jun 19, 10:09 PM CDT	Special Marine Warning	LIX		66 min
Jun 19, 10:09 PM CDT	Severe Thunderstorm Warning	LIX	Saint Tammany, Tangipahoa	51 min
Jun 19, 10:14 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LIX	Plaquemines, Saint Bernard	46 min
Jun 19, 10:21 PM CDT	Special Marine Warning	LIX		84 min
Jun 19, 10:38 PM CDT	Special Marine Warning	LIX		97 min
Jun 19, 10:59 PM CDT	Special Weather Statement	LIX	Orleans	46 min
Jun 19, 11:01 PM CDT	Special Weather Statement	LIX	Tangipahoa	44 min
Jun 19, 11:19 PM CDT	Flash Flood Warning	LIX	Livingston, Saint Helena, Tangipahoa	5 hr
Jun 19, 11:27 PM CDT	Special Marine Warning	LIX		63 min
Jun 19, 11:40 PM CDT	Special Weather Statement	LIX	Assumption, East Baton Rouge, Iberville, West Baton Rouge	50 min
Jun 19, 11:49 PM CDT	Special Marine Warning	LIX		26 min
Jun 20, 12:10 AM CDT	Special Weather Statement	LIX	Saint Charles	50 min
Jun 20, 12:13 AM CDT	Severe Thunderstorm Warning	LIX	Saint Charles, Saint John the Baptist	47 min
Jun 20, 12:29 AM CDT	Special Weather Statement	LIX	Orleans	31 min
Jun 20, 12:45 AM CDT	Severe Thunderstorm Warning	LIX	Saint Charles, Saint John the Baptist	45 min
Jun 20, 1:02 AM CDT	Special Marine Warning	LIX		58 min
Jun 20, 1:24 AM CDT	Special Weather Statement	LIX	Saint Charles	51 min
Jun 20, 2:15 AM CDT	Severe Thunderstorm Warning	LIX	Livingston, Saint John the Baptist, Tangipahoa	33 min
Jun 20, 2:18 AM CDT	Special Marine Warning	LIX		39 min
Jun 20, 2:56 AM CDT	Special Marine Warning	LIX		94 min
Jun 20, 3:13 AM CDT	Special Weather Statement	LIX	Tangipahoa	32 min
Jun 20, 3:52 AM CDT	Special Marine Warning	LIX		53 min
Jun 20, 10:03 AM CDT	Special Marine Warning	LIX		57 min
Jun 20, 11:01 AM CDT	Special Marine Warning	LIX		89 min
Jun 20, 11:38 AM CDT	Special Marine Warning	LIX		32 min
Jun 20, 12:31 PM CDT	Special Marine Warning	LIX		89 min
Jun 20, 12:34 PM CDT	Special Weather Statement	LIX	Saint Bernard	41 min
Jun 20, 12:37 PM CDT	Special Marine Warning	LIX		113 min
Jun 20, 12:50 PM CDT	Special Weather Statement	LIX	Jefferson	40 min
Jun 20, 1:01 PM CDT	Severe Thunderstorm Warning	LIX	Saint Bernard	44 min
Jun 20, 1:15 PM CDT	Special Weather Statement	LIX	Washington	45 min
Jun 20, 1:43 PM CDT	Severe Thunderstorm Warning	LIX	Saint Bernard, Saint Tammany	47 min
Jun 20, 1:46 PM CDT	Special Weather Statement	LIX	Saint Bernard	29 min
Jun 20, 1:52 PM CDT	Special Marine Warning	LIX		83 min
Jun 20, 1:55 PM CDT	Special Weather Statement	LIX	Orleans	35 min
Jun 20, 2:11 PM CDT	Severe Thunderstorm Warning	LIX	Plaquemines, Saint Bernard	49 min
Jun 20, 2:31 PM CDT	Special Marine Warning	LIX		59 min
Jun 20, 2:36 PM CDT	Severe Thunderstorm Warning	LIX	Jefferson, Plaquemines	39 min
Jun 20, 2:48 PM CDT	Special Marine Warning	LIX		57 min
Jun 20, 3:01 PM CDT	Severe Thunderstorm Warning	LIX	Jefferson, Lafourche, Plaquemines	59 min
Jun 20, 3:05 PM CDT	Special Marine Warning	LIX		40 min
Jun 20, 3:07 PM CDT	Special Marine Warning	LIX		113 min
Jun 20, 3:12 PM CDT	Severe Thunderstorm Warning	LIX	Jefferson, Lafourche, Plaquemines, Saint Charles	48 min
Jun 20, 3:28 PM CDT	Gale Warning	LIX		5 hr
Jun 20, 3:31 PM CDT	Wind Advisory	LIX	Jefferson, Orleans, Plaquemines, Saint Bernard, Saint John the Baptist	4 hr
Jun 20, 3:35 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LIX	Ascension, Lafourche, Saint Charles, Saint James, Saint John the Baptist	40 min
Jun 20, 3:43 PM CDT	Special Marine Warning	LIX		2 hr
Jun 20, 3:51 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LIX	Plaquemines	54 min
Jun 20, 4:00 PM CDT	Severe Thunderstorm Warning	LIX	Jefferson, Lafourche, Plaquemines	45 min
Jun 20, 4:05 PM CDT	Severe Thunderstorm Warning Destructive damage threat	LIX	Ascension, Jefferson, Lafourche, Saint Charles, Saint James, Saint John the Baptist	40 min
Jun 20, 4:38 PM CDT	Special Weather Statement	LIX	East Feliciana	52 min
Jun 20, 4:45 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LIX	Ascension, Assumption, East Baton Rouge, Iberville, Jefferson, Lafourche and 3 more	45 min
Jun 20, 4:46 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LIX	East Baton Rouge, East Feliciana	44 min
Jun 20, 4:57 PM CDT	Special Marine Warning	LIX		106 min
Jun 20, 5:04 PM CDT	Severe Thunderstorm Warning	LIX	East Baton Rouge, Iberville, West Baton Rouge	41 min
Jun 20, 5:19 PM CDT	Severe Thunderstorm Warning	LIX	Jefferson, Lafourche, Terrebonne	41 min
Jun 20, 5:22 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LIX	Ascension, Assumption, East Baton Rouge, Iberville, Lafourche, Saint James and 1 more	38 min
Jun 20, 5:25 PM CDT	Severe Thunderstorm Warning	LIX	East Baton Rouge, East Feliciana, Livingston	50 min
Jun 20, 5:29 PM CDT	Severe Thunderstorm Warning	LIX	Livingston, Saint Helena, Tangipahoa	28 min
Jun 20, 5:55 PM CDT	Severe Thunderstorm Warning Destructive damage threat	LIX	Assumption, Lafourche, Terrebonne	50 min
Jun 20, 6:00 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LIX	Ascension, Assumption, Iberville, Lafourche, Saint James	45 min
Jun 20, 6:02 PM CDT	Areal Flood Advisory	LIX	Ascension, Assumption, Lafourche, Saint James, Saint John the Baptist	3 hr

Nearby

Severe Thunderstorm Warnings in Louisiana, 2023 Every severe thunderstorm warning in 2023

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.