Alert archive / Louisiana / Severe Thunderstorm Warnings in 1991

Severe Thunderstorm Warning 13, NWS New Orleans, LA

March 1, 1991Jefferson Parish, Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at Mar 1, 1991, 9:47 AM CST for Jefferson Parish, Louisiana. It was in force for 58 min.

The area

The counties it named.

The facts

Issued
Mar 1, 1991, 9:47 AM CST (15:47 UTC)
Expired
Mar 1, 1991, 10:45 AM CST
In force
58 min
Issued by
NWS New Orleans, LA
Area
Whole counties

County Jefferson Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 3.8 hours before the alert went out and 74 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-pSkew-T log-p diagram, Slidell Radar S, LA at 12:00Z on 1991-03-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 60 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Slidell Radar S, LA at 12:00Z on 1991-03-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 348 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
60 J/kg
Mixed-layer CIN
-97 J/kg
Mixed-layer LCL
582 m above ground
0-6 km bulk shear
63 kt
0-1 km storm-relative helicity
348 m²/s²
0-3 km storm-relative helicity
409 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.8

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

Special weather statement, Mar 1, 6:35 AM CST, 3 hours 12 minutes before
LAZ006-008-009-011300-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BATON ROUGE LA
630 AM CST FRI MAR 1 1991

...A TORNADO WATCH REMAINS IN EFFECT UNTIL 10AM FOR PEOPLE IN
AVOYELLES...CATAHOULA...CONCORDIA AND ST. LANDRY PARISHES IN EAST
CENTRAL LOUISIANA...

RADAR SHOWED A BROKEN LINE OF STRONG THUNDERSTORMS WITH HEAVY RAIN
FROM THE VIDALIA/NATCHEZ AREA...SOUTHWEST ACROSS CATAHOULA PARISH
...ACROSS ALEXANDRIA TO NEAR DE RIDDER.  THIS LINE SHOWED LITTLE
MOVEMENT WITH THE THUNDERSTORMS MOVING RAPIDLY NORTHEAST ALONG THE
LINE.

ELSEWHERE LARGE AREAS OF RAIN AND NUMEROUS THUNDERSTORMS COVERED MOST
OF LOUISIANA...EXCEPT FOR THE EXTREME SOUTHEAST AND SOUTH CENTRAL PART.

PEOPLE THROUGHOUT ALL OF EAST CENTRAL LOUISIANA...INCLUDING THE BATON
ROUGE METRO AREA...CAN EXPECT SOME FLOODING OF STREETS...UNDERPASSES
AND LOW LYING AREAS FROM THE HEAVY RAIN AND BE ALERT TO
DEVELOPING STRONG THUNDERSTORMS THROUGHOUT THE DAY.

MOTORIST ARE URGED TO ALLOW EXTRA TIME TO REACH YOUR DESTINATION
THIS MORNING.
Special weather statement, Mar 1, 7:15 AM CST, 2 hours 32 minutes before
LAZ006-008-009-011405-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BATON ROUGE LA
710 AM CST FRI MAR 1 1991

...A TORNADO WATCH IS IN EFFECT UNTIL NOON FOR PEOPLE IN ALL OF
EAST CENTRAL LOUISIANA...

RADAR SHOWED A SOLID LINE OF STRONG THUNDERSTORMS WITH HEAVY RAIN
FROM NEAR EUNICE...SOUTH TO THE COAST.  THESE THUNDERSTORMS ARE MOVING
RAPIDLY NORTHEAST AND WILL MOVE TO SOUTHERN AVOYELLES AND ST. LANDRY
PARISHES WITHIN THE HALF HOUR.

A BROKEN LINE OF STRONG THUNDERSTORMS WITH HEAVY RAIN CONTINUED ACROSS
CATAHOULA AND CONCORDIA PARISHES EXTENDING SOUTHWEST ACROSS ALEXANDRIA.
THIS LINE SHOWED LITTLE MOVEMENT WITH THE THUNDERSTORMS MOVINT RAPIDLY
NORTHEAST ALONG THE LINE.

ELSEWHERE...LARGE AREAS OF RAIN AND SEVERAL THUNDERSTORMS COVERED MOST
OF LOUISIANA...AND WILL CONTINUE TO DEVELOP THROUGHOUT THE DAY.
PEOPLE THROUGHOUT EAST CENTRAL LOUISIANA...INCLUDING THE BATON ROUGE
METRO AREA...CAN EXPECT THE HEAVY RAIN TO PRODUCE FLOODING OF STREETS
...LOW LYING AREAS AND UNDERPASSES AS THE THUNDERSTORMS MOVE THROUGH.

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR TORNADOES
AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA.  PEOPLE IN
THESE AREAS SHOULD B
E ON THE LOOKOUT FOR THREATENING WEATHER CONDITIONS
AND LISTEN FOR LATER STATEMENTS AND POSSIBLE WARNINGS.
Special weather statement, Mar 1, 7:41 AM CST, 2 hours 6 minutes before
LAZ008>010-012>014-MSZ010>014-ALZ016-011435-

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE NEW ORLEANS LA
735 AM CST SAT MAR 1 1991

...A TORNADO WATCH IS IN EFFECT UNTIL NOON FOR ALL OF SOUTHEAST
LOUISIANA...

A BAND OF THUNDERSTORMS WITH VERY HEAVY RAIN EXTENDED FROM ABOUT 30
MILES SOUTHWEST OF NEW ORLEANS INTERNATIONAL AIRPORT...NORTH ACROSS
LAKE PONTCHARTRAIN TO NEAR COVINGTON. THEY WERE PART OF A LARGE AREA
OF THUNDERSTORMS AND PATCHES OF LIGHT RAIN OVER SOUTHEAST LOUISIANA
INCLUDING METROPOLITAN NEW ORLEANS...AND SOUTHERN MISSISSIPPI.
FREQUENT LIGHTNING...STRONG GUSTY WINDS...AND LOCALLY HEAVY RAINS
WILL ACCOMPANY THESE THUNDERSTORMS AS THEY MOVE NORTHEAST ABOUT,
40 MILES AN HOUR.  BOATERS ON LAKES PONTCHARTRAIN AND LAKE MAUREPAS
SHOULD BE ALERT FOR STRONGER WINDS AND HIGHER WAVES NEAR THE
THUNDERSTORMS.
Special weather statement, Mar 1, 7:52 AM CST, 1 hour 55 minutes before
LAZ006-008-009-011500-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BATON ROUGE LA
750 AM CST FRI MAR 1 1991

...A TORNADO WATCH IS IN EFFECT UNTIL NOON FOR PEOPLE IN ALL OF
EAST CENTRAL LOUISIANA...INCLUDING THE BATON ROUGE METRO AREA...

RADAR SHOWED A SOLID LINE OF STRONG THUNDERSTORMS WITH HEAVY RAIN
FROM NEAR SIMMESPORT...SOUTH NEAR MELVILLE AND KROTZ SPRINGS...
CONTINUING SOUTH TO THE COAST.  THIS LINE WAS MOVING EAST ABOUT 40
MPH AND WILL MOVE TO SOUTHERN CONCORDIA...WEST FELICIANA...POINTE
COUPEE...WEST BATON ROUGE AND IBERVILLE PARISHES WITHIN THE HALF HOUR
AND TO EAST FELICIANA...EAST BATON ROUGE AND ASCENSION PARISHES WITHIN
THE HOUR.

ELSEWHERE...LARGE AREAS OF RAIN AND SEVERAL THUNDERSTORMS COVERED MOST
OF LOUISIANA...AND WILL CONTINUE TO DEVELOP THROUGHOUT THE DAY.
<
IN ADDITION TO THE POSIBILITY OF DEVELOPING SEVERE WEATHER...PEOPLE
THROUGHOUT EAST CENTRAL LOUISIANA...INCLUDING THE BATON ROUGE METRO
AREA...CAN EXPECT THE HEAVY RAIN TO PRODUCE FLOODING OF STREETS...
LOW LYING AREAS AND UNDERPASSES AS THE THUNDERSTORMS MOVE THROUGH.

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR TORNADOES
AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH DAREA.  PEOPLE IN
THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER CONDITIONS
AND LISTEN FOR LATER STATEMENTS AND POSSIBLE WARNINGS.
Special weather statement, Mar 1, 8:50 AM CST, 57 minutes before
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Special weather statement, Mar 1, 8:51 AM CST, 56 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>
  <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.
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The office that day

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

IssuedProductOfficeCountiesLasted
Mar 1, 8:27 AM CSTSevere Thunderstorm WarningLIXEast Baton Rouge, West Baton Rouge48 min
Mar 1, 8:42 AM CSTTornado WarningLIXAscension, Livingston48 min
Mar 1, 8:42 AM CSTTornado WarningLIXEast Baton Rouge18 min
Mar 1, 8:48 AM CSTTornado WarningLIXSaint Helena42 min
Mar 1, 8:48 AM CSTTornado WarningLIXEast Feliciana12 min
Mar 1, 9:02 AM CSTSevere Thunderstorm WarningLIXSaint Tammany, Tangipahoa, Washington58 min
Mar 1, 9:43 AM CSTSevere Thunderstorm WarningLIXLafourche, Saint Charles, Saint John the Baptist62 min
Mar 1, 9:43 AM CSTSevere Thunderstorm WarningLIXSaint James62 min
Mar 1, 9:47 AM CSTSevere Thunderstorm WarningLIXOrleans, Plaquemines, Saint Bernard58 min
Mar 1, 9:59 AM CSTSevere Thunderstorm WarningLIXSaint Tammany31 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 1991Every severe thunderstorm warning in 1991

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.