Alert archive / Louisiana / Special Weather Statements in 2021

Special Weather Statement, NWS New Orleans, LA

April 13, 2021Assumption Parish, Louisiana

NWS New Orleans, LA issued this special weather statement at Apr 13, 2021, 6:44 PM CDT for Assumption Parish, Louisiana. It was in force for 46 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: Apr 13, 2021, 6:44 PM CDT (23:44 UTC)
Expired: Apr 13, 2021, 7:30 PM CDT
In force: 46 min
Issued by: NWS New Orleans, LA

County Assumption Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 11.7 hours before the alert went out and 143 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: 1989 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 70 m²/s²
0-3 km storm-relative helicity: 88 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

<!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>

What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Apr 13, 4:22 PM CDT, 2 hours 22 minutes earlier.

Area forecast discussion, Apr 13, 4:22 PM CDT, 2 hours 22 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

Local storm report, Apr 13, 6:04 PM CDT, 40 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
604 PM CDT TUE APR 13 2021

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

0400 PM     MARINE TSTM WIND 26 S VENICE             28.91N 89.43W
04/13/2021  M53 MPH          GMZ552             LA   MESONET

            MESONET STATION BURL1 SOUTHWEST PASS.

&&

JRK

Local storm report, Apr 13, 6:18 PM CDT, 26 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
618 PM CDT TUE APR 13 2021

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

0330 PM     MARINE TSTM WIND 3 NE GRAND ISLE         29.27N 89.95W
04/13/2021  M75 MPH          GMZ552             LA   PUBLIC

            GISL1 - GRAND ISLE STATION.

&&

JRK

Local storm report, Apr 13, 6:21 PM CDT, 23 minutes before

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE NEW ORLEANS LA
621 PM CDT TUE APR 13 2021

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

0538 PM     NON-TSTM WND GST 1 SSW MANDEVILLE        30.36N 90.09W
04/13/2021  M56 MPH          GMZ530             LA   MESONET

            MESONET STATION XMVL MANDEVILLE.

0522 PM     NON-TSTM WND GST 12 SSW MANDEVILLE       30.20N 90.12W
04/13/2021  M55 MPH          GMZ530             LA   MESONET

            MESONET STATION XPTN PONTCHARTRAIN CAUSEWAY.

0400 PM     MARINE TSTM WIND 26 S VENICE             28.91N 89.43W
04/13/2021  M53 MPH          GMZ552             LA   MESONET

            MESONET STATION BURL1 SOUTHWEST PASS.

0330 PM     MARINE TSTM WIND 3 NE GRAND ISLE         29.27N 89.95W
04/13/2021  M75 MPH          GMZ552             LA   PUBLIC

            GISL1 - GRAND ISLE STATION.

0215 PM     FLASH FLOOD      2 S DESTREHAN           29.93N 90.37W
04/13/2021                   ST. CHARLES        LA   EMERGENCY MNGR

            CORRECTS PREVIOUS FLASH FLOOD REPORT FROM 2
            S DESTREHAN. MILLING AVENUE IN LULING
            BETWEEN POST DRIVE AND HALL DRIVE CLOSED DUE
            TO HIGH WATER.

0210 PM     FLASH FLOOD      1 SSE NEW SARPY         29.97N 90.38W
04/13/2021                   ST. CHARLES        LA   EMERGENCY MNGR

            ORMOND VILLAGE DRIVE IN DESTREHAN CLOSED DUE
            TO HIGH WATER.

0210 PM     FLASH FLOOD      1 NE BOUTTE             29.90N 90.39W
04/13/2021                   ST. CHARLES        LA   EMERGENCY MNGR

            ALEXANDER STREET CLOSED DUE TO HIGH WATER.

0202 PM     TSTM WND DMG     1 W METAIRIE            30.00N 90.20W
04/13/2021                   JEFFERSON          LA   PUBLIC

            PORTION OF ROOF TORN OFF PHOEBE HEARST
            ELEMENTARY IN METAIRIE. LIKELY FROM A WAKE
            LOW.

0202 PM     TSTM WND DMG     2 ENE KENNER            30.00N 90.22W
04/13/2021                   JEFFERSON          LA   PUBLIC

            ROOF AWNING BLOWN OFF OF A HOME ON DAVID
            DRIVE NEAR WEST NAPOLEON.

0200 PM     TSTM WND DMG     3 N KENNER              30.02N 90.24W
04/13/2021                   JEFFERSON          LA   PUBLIC

            TREES AND POWERLINES DOWN NEAR ARKANSAS AVE
            AND 37TH ST.

0200 PM     MARINE TSTM WIND 4 ENE METAIRIE          30.03N 90.11W
04/13/2021  M54 MPH          GMZ530             LA   MESONET

            WXFLOW @ NEW CANAL.

0153 PM     TSTM WND GST     6 W EAST NEW ORLEANS    30.05N 90.03W
04/13/2021  M52 MPH          GMZ530             LA   ASOS

            ASOS STATION KNEW NEW ORLEANS LAKEFRONT
            AIRPORT.

0115 PM     HAIL             CUT OFF                 29.53N 90.33W
04/13/2021  E1.00 INCH       LAFOURCHE          LA   BROADCAST MEDIA

            ESTIMATED FROM SOCIAL MEDIA VIDEO. TIME
            BASED ON RADAR.

0112 PM     MARINE TSTM WIND 12 SSW MANDEVILLE       30.20N 90.12W
04/13/2021  M43 MPH          GMZ530             LA   MESONET

            MESONET STATION XPTN PONTCHARTRAIN CAUSEWAY.

1116 AM     TSTM WND DMG     5 E PRAIRIEVILLE        30.29N 90.89W
04/13/2021                   ASCENSION          LA   TRAINED SPOTTER

            LARGE TREE BRANCHES AND FENCE DOWN ON
            NORWOOD RD NEAR STONE RIDGE AVE. TIME
            ESTIMATED FROM RADAR.

1041 AM     TSTM WND DMG     CONVENT                 30.02N 90.83W
04/13/2021                   ST. JAMES          LA   LAW ENFORCEMENT

            A FEW TREES DOWN IN CONVENT.

&&

Special weather statement, Apr 13, 6:26 PM CDT, 18 minutes before

Special Weather Statement
National Weather Service New Orleans LA
626 PM CDT Tue Apr 13 2021

LAZ050-072-140000-
Livingston-Southern Tangipahoa-
626 PM CDT Tue Apr 13 2021

...A STRONG THUNDERSTORM WILL AFFECT NORTHEASTERN LIVINGSTON AND
SOUTHWESTERN TANGIPAHOA PARISHES...

At 625 PM CDT, a strong thunderstorm was located near Livingston, or
11 miles east of Denham Springs, moving east at 35 mph.

Wind gusts up to 50 mph and pea size hail are possible with this
storm.

Locations impacted include...
Hammond, Ponchatoula, Walker, Livingston, Albany, Springfield,
Natalbany and Tickfaw.

If outdoors, consider seeking shelter inside a building.

LAT...LON 3048 9087 3057 9084 3059 9037 3038 9045
TIME...MOT...LOC 2325Z 276DEG 31KT 3053 9078

JRK

Special weather statement, Apr 13, 6:27 PM CDT, 17 minutes before

Special Weather Statement
National Weather Service New Orleans LA
627 PM CDT Tue Apr 13 2021

LAZ049-056>058-140000-
Ascension-Assumption-St. John The Baptist-St. James-
627 PM CDT Tue Apr 13 2021

...A STRONG THUNDERSTORM WILL AFFECT WEST CENTRAL ST. JOHN THE
BAPTIST...SOUTHERN ASCENSION...ST. JAMES AND NORTH CENTRAL ASSUMPTION
PARISHES...

At 627 PM CDT, a strong thunderstorm was located over Donaldsonville,
moving east at 40 mph.

Wind gusts up to 50 mph and pea size hail are possible with this
storm.

Locations impacted include...
Donaldsonville, Gramercy, Lutcher, Sorrento, Wallace, Convent, North
Vacherie, Garyville, Belle Rose and Edgard.

If outdoors, consider seeking shelter inside a building.

LAT...LON 3016 9106 3020 9072 3018 9071 3017 9069
      3020 9067 3021 9059 3019 9060 3018 9058
      2996 9062 3002 9107
TIME...MOT...LOC 2327Z 272DEG 34KT 3009 9099

JRK

Special weather statement, Apr 13, 6:44 PM CDT, 0 minutes before

Special Weather Statement
National Weather Service New Orleans LA
644 PM CDT Tue Apr 13 2021

LAZ056-057-059-065-140030-
Upper Terrebonne-Assumption-St. James-Upper Lafourche-
644 PM CDT Tue Apr 13 2021

...A STRONG THUNDERSTORM WILL AFFECT SOUTHWESTERN ST. JAMES...NORTH
CENTRAL TERREBONNE...NORTHWESTERN LAFOURCHE AND ASSUMPTION
PARISHES...

At 643 PM CDT, a strong thunderstorm was located over Pierre Part, or
near Belle River, moving east at 35 mph.

Winds in excess of 40 mph and pea size hail are possible with this
storm.

Locations impacted include...
Thibodaux, Napoleonville, Schriever, Supreme, Gray, Chackbay,
Paincourtville, Labadieville and South Vacherie.

If outdoors, consider seeking shelter inside a building.

LAT...LON 3000 9124 3003 9122 3003 9120 2991 9066
      2965 9079 2980 9110 2984 9113 2985 9118
      2990 9121 2992 9123 2993 9123 2997 9126
      3000 9126
TIME...MOT...LOC 2343Z 290DEG 40KT 2995 9125

JRK

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 13, 4:14 AM CDT	Flash Flood Watch	LIX	Assumption, East Baton Rouge, East Feliciana, Iberville, Orleans, Pointe Coupee and 9 more	5 days
Apr 13, 9:18 AM CDT	Severe Thunderstorm Warning	LIX	Iberville, Pointe Coupee, West Feliciana	21 min
Apr 13, 9:38 AM CDT	Severe Thunderstorm Warning	LIX	Ascension, Assumption, East Baton Rouge, Iberville	13 min
Apr 13, 9:47 AM CDT	Special Weather Statement	LIX	West Baton Rouge	43 min
Apr 13, 9:56 AM CDT	Severe Thunderstorm Warning	LIX	Ascension, Assumption, Iberville, Livingston, Saint James	19 min
Apr 13, 10:13 AM CDT	Severe Thunderstorm Warning	LIX	East Baton Rouge, East Feliciana, Iberville, Pointe Coupee, West Baton Rouge, West Feliciana	17 min
Apr 13, 10:26 AM CDT	Special Weather Statement	LIX	Ascension	34 min
Apr 13, 10:32 AM CDT	Severe Thunderstorm Warning	LIX	Ascension, Livingston, Saint James, Saint John the Baptist	28 min
Apr 13, 10:33 AM CDT	Severe Thunderstorm Warning	LIX	Ascension, East Baton Rouge, Iberville, Livingston, West Baton Rouge	27 min
Apr 13, 10:35 AM CDT	Special Weather Statement	LIX	East Baton Rouge, East Feliciana, Saint Helena, West Feliciana	55 min
Apr 13, 10:49 AM CDT	Severe Thunderstorm Warning	LIX	Assumption	26 min
Apr 13, 10:59 AM CDT	Special Weather Statement	LIX	Ascension, East Baton Rouge, Livingston	46 min
Apr 13, 11:11 AM CDT	Special Weather Statement	LIX	Terrebonne	49 min
Apr 13, 11:14 AM CDT	Severe Thunderstorm Warning	LIX	Assumption, Lafourche, Saint James, Saint John the Baptist	31 min
Apr 13, 11:18 AM CDT	Severe Thunderstorm Warning	LIX	East Baton Rouge, East Feliciana, Livingston, Saint Helena, Tangipahoa	27 min
Apr 13, 11:41 AM CDT	Severe Thunderstorm Warning	LIX	Lafourche, Saint Charles, Saint James, Saint John the Baptist	15 min
Apr 13, 11:45 AM CDT	Severe Thunderstorm Warning	LIX	Livingston, Saint Helena, Saint Tammany, Tangipahoa, Washington	30 min
Apr 13, 11:49 AM CDT	Special Weather Statement	LIX	Livingston	26 min
Apr 13, 11:53 AM CDT	Special Weather Statement	LIX	Ascension	37 min
Apr 13, 11:54 AM CDT	Severe Thunderstorm Warning	LIX	Lafourche, Terrebonne	36 min
Apr 13, 12:05 PM CDT	Special Weather Statement	LIX	Jefferson	55 min
Apr 13, 12:08 PM CDT	Special Marine Warning	LIX		67 min
Apr 13, 12:14 PM CDT	Severe Thunderstorm Warning	LIX	Saint Tammany, Tangipahoa	14 min
Apr 13, 12:23 PM CDT	Special Marine Warning	LIX		52 min
Apr 13, 12:27 PM CDT	Severe Thunderstorm Warning	LIX	Lafourche, Saint Charles	11 min
Apr 13, 12:31 PM CDT	Special Weather Statement	LIX	Saint James, Saint John the Baptist	59 min
Apr 13, 1:02 PM CDT	Special Weather Statement	LIX	Terrebonne	43 min
Apr 13, 1:14 PM CDT	Special Weather Statement	LIX	Jefferson, Lafourche	31 min
Apr 13, 1:21 PM CDT	Areal Flood Advisory	LIX	Ascension	114 min
Apr 13, 1:29 PM CDT	Special Marine Warning	LIX		61 min
Apr 13, 1:40 PM CDT	Special Weather Statement	LIX	Saint Charles	35 min
Apr 13, 1:44 PM CDT	Severe Thunderstorm Warning	LIX	Lafourche, Saint Charles, Terrebonne	31 min
Apr 13, 1:54 PM CDT	Flash Flood Warning	LIX	Jefferson	111 min
Apr 13, 2:07 PM CDT	Flash Flood Warning	LIX	Saint Charles	83 min
Apr 13, 2:14 PM CDT	Special Weather Statement	LIX	Lafourche, Saint Charles	61 min
Apr 13, 2:17 PM CDT	Special Weather Statement	LIX	Jefferson	28 min
Apr 13, 2:22 PM CDT	Severe Thunderstorm Warning	LIX	Jefferson, Lafourche	38 min
Apr 13, 2:27 PM CDT	Special Marine Warning	LIX		63 min
Apr 13, 2:48 PM CDT	Special Weather Statement	LIX	Jefferson, Lafourche, Plaquemines, Terrebonne	57 min
Apr 13, 2:57 PM CDT	Special Marine Warning	LIX		63 min
Apr 13, 3:30 PM CDT	Small Craft Advisory	LIX		3 hr
Apr 13, 3:45 PM CDT	Severe Thunderstorm Warning	LIX	Jefferson	15 min
Apr 13, 3:58 PM CDT	Special Marine Warning	LIX		62 min
Apr 13, 4:30 PM CDT	Special Marine Warning	LIX		90 min
Apr 13, 4:42 PM CDT	Special Marine Warning	LIX		93 min
Apr 13, 5:05 PM CDT	Special Marine Warning	LIX		55 min
Apr 13, 5:58 PM CDT	Special Marine Warning	LIX		70 min
Apr 13, 6:01 PM CDT	Special Marine Warning	LIX		89 min
Apr 13, 6:07 PM CDT	Special Marine Warning	LIX		67 min
Apr 13, 6:12 PM CDT	Special Marine Warning	LIX		65 min
Apr 13, 6:17 PM CDT	Wind Advisory	LIX	Assumption, Orleans, Saint Bernard, Saint James, Saint John the Baptist, Saint Tammany	6 hr
Apr 13, 6:26 PM CDT	Special Weather Statement	LIX	Livingston	34 min
Apr 13, 6:27 PM CDT	Special Weather Statement	LIX	Saint James	33 min
Apr 13, 6:56 PM CDT	Gale Warning	LIX		9 hr
Apr 13, 6:56 PM CDT	Small Craft Advisory	LIX		33 hr
Apr 13, 8:43 AM CDT	Special Weather Statement	LIX	Wilkinson	62 min
Apr 13, 9:42 AM CDT	Special Weather Statement	LIX	Amite	63 min
Apr 13, 9:53 AM CDT	Special Weather Statement	LIX	Wilkinson	67 min
Apr 13, 10:01 AM CDT	River Flood Warning	LIX	Jackson	3 hr
Apr 13, 10:16 AM CDT	River Flood Warning	LIX	Pike, Walthall	4 days
Apr 13, 10:43 AM CDT	Special Weather Statement	LIX	Amite	62 min

Nearby

Special Weather Statements in Louisiana, 2021 Every special weather statement 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.