Alert archive / Louisiana / Severe Thunderstorm Warnings in 1989

Severe Thunderstorm Warning 45, NWS New Orleans, LA

May 18, 1989Lafourche Parish, Terrebonne Parish, Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at May 18, 1989, 5:09 PM CDT for Lafourche Parish, Terrebonne Parish, Louisiana. It was in force for 66 min.

The area

The counties it named.

The facts

Issued: May 18, 1989, 5:09 PM CDT (22:09 UTC)
Expired: May 18, 1989, 6:15 PM CDT
In force: 66 min
Issued by: NWS New Orleans, LA
Area: Whole counties

Counties Lafourche Parish, LA, Terrebonne Parish, LA

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 10.2 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: 1217 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 537 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 107 m²/s²
0-3 km storm-relative helicity: 144 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 3.8

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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.

In the hours before

Local storm report, May 18, 11:41 AM CDT, 5 hours 28 minutes before

STORM REPORT
NATIONAL WEATHER SERVICE BATON ROUGE LA
1142 AM CDT THU MAY 18 1989

MAY 18 1989...

     1134 AM CDT...TREES AND POWER LINES DOWN...HIGH WINDS AND STREET
     FLOODING IN WASHINGTON LA ABOUT 7 MILES NORTH OF OPELOUSAS...BY
     THE ST LANDRY PARISH SHERIFF OFFICE.  NO INJURIES.

Local storm report, May 18, 1:10 PM CDT, 3 hours 59 minutes before

STORM REPORT
NATIONAL WEATHER SERVICE BATON ROUGE LA
112 PM CDT THU MAY 18 1989

MAY 18 1989...

     1234 PM CDT...TREES DOWN ON HIGHWAY 182 AT SUNSET LOUISIANA.
     TREES FELL ON TWO MOBILE HOMES...M,AJOR DAMAGE TO MOBILE HOMES
     ...BY ST LANDRY PARISH SHERIFF OFFICE.  NO INJURIES.

Local storm report, May 18, 2:29 PM CDT, 2 hours 40 minutes before

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Local storm report, May 18, 4:01 PM CDT, 1 hour 8 minutes before

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<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
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</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.
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        Please try again in a few minutes.
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        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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The office that day

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

Issued	Product	Office	Counties	Lasted
May 18, 11:22 AM CDT	Severe Thunderstorm Warning	LIX	Saint Landry	68 min
May 18, 11:51 AM CDT	Severe Thunderstorm Warning	LIX	Pointe Coupee, Saint Landry	69 min
May 18, 12:13 PM CDT	Severe Thunderstorm Warning	LIX	Iberia, Saint Martin	62 min
May 18, 12:29 PM CDT	Tornado Warning	LIX	Saint Martin	46 min
May 18, 12:29 PM CDT	Tornado Warning	LIX	Saint Landry	61 min
May 18, 12:57 PM CDT	Severe Thunderstorm Warning	LIX	Iberville, Pointe Coupee, West Baton Rouge	63 min
May 18, 12:57 PM CDT	Severe Thunderstorm Warning	LIX	West Feliciana	63 min
May 18, 1:14 PM CDT	Tornado Warning	LIX	Iberville, West Baton Rouge	46 min
May 18, 1:57 PM CDT	Severe Thunderstorm Warning	LIX	East Baton Rouge	48 min
May 18, 2:30 PM CDT	Severe Thunderstorm Warning	LIX	Iberia, Saint Martin	60 min
May 18, 3:38 PM CDT	Severe Thunderstorm Warning	LIX	Iberville, West Baton Rouge	52 min
May 18, 4:01 PM CDT	Severe Thunderstorm Warning	LIX	Ascension, East Baton Rouge	44 min
May 18, 4:50 PM CDT	Severe Thunderstorm Warning	LIX	Assumption, Saint Martin, St. Mary	55 min
May 18, 5:27 PM CDT	Severe Thunderstorm Warning	LIX	Tangipahoa	63 min
May 18, 5:33 PM CDT	Severe Thunderstorm Warning	LIX	Livingston	42 min
May 18, 6:33 PM CDT	Severe Thunderstorm Warning	LIX	Tangipahoa, Washington	42 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 1989 Every severe thunderstorm warning in 1989

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.