Alert archive / Mississippi / Special Weather Statements in 2020

Special Weather Statement, NWS New Orleans, LA

July 15, 2020Harrison County, Mississippi

NWS New Orleans, LA issued this special weather statement at Jul 15, 2020, 2:21 PM CDT for Harrison County, Mississippi. It was in force for 69 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 15, 2020, 2:21 PM CDT (19:21 UTC)
Expired
Jul 15, 2020, 3:30 PM CDT
In force
69 min
Issued by
NWS New Orleans, LA

County Harrison County, MS

The radar

The Mobile radar (KMOB), 85 km from the middle of the area, began a volume at 19:23 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 7.4 hours before the alert went out and 63 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 2020-07-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1780 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 2020-07-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -58 square meters per square second.1939Sfc1 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
1780 J/kg
Mixed-layer CIN
-39 J/kg
Mixed-layer LCL
888 m above ground
0-6 km bulk shear
16 kt
0-1 km storm-relative helicity
-58 m²/s²
0-3 km storm-relative helicity
-68 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

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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 Jul 15, 12:21 PM CDT, 2 hours earlier.

Area forecast discussion, Jul 15, 12:21 PM CDT, 2 hours before
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In the hours before

Special weather statement, Jul 15, 11:23 AM CDT, 2 hours 58 minutes before
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  <link rel="stylesheet" href="index.css">
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<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>
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        The site you requested is temporarily down for maintenance or an unexpected outage.
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      <p id="message2">
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Special weather statement, Jul 15, 12:00 PM CDT, 2 hours 21 minutes before
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  <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>
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Special weather statement, Jul 15, 1:02 PM CDT, 1 hour 19 minutes before
Special Weather Statement
National Weather Service New Orleans LA
102 PM CDT Wed Jul 15 2020

LAZ058-060-061-151845-
St. Charles-St. John The Baptist-Upper Jefferson-
102 PM CDT Wed Jul 15 2020

...A STRONG THUNDERSTORM WILL AFFECT CENTRAL ST. JOHN THE BAPTIST...
ST. CHARLES AND NORTHWESTERN JEFFERSON PARISHES...

At 102 PM CDT, a strong thunderstorm was located over Destrehan, or
near Hahnville, moving south at 10 mph.

Winds in excess of 30 mph are possible with this storm.

Locations impacted include...
Hahnville, Laplace, Reserve, Killona, Norco, Paradis, Montz, Luling,
Boutte, Ama, Bayou Gauche, Destrehan, Taft, Waggaman, New Sarpy, St.
Rose, Edgard and New Orleans Armstrong Airport.

Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.

LAT...LON 2979 9042 3006 9052 3014 9048 3014 9043
      3012 9043 3009 9041 3006 9037 3005 9026
      2978 9020
TIME...MOT...LOC 1802Z 337DEG 7KT 2995 9035

KLG
Special weather statement, Jul 15, 2:21 PM CDT, 0 minutes before
Special Weather Statement
National Weather Service New Orleans LA
221 PM CDT Wed Jul 15 2020

MSZ081-152030-
Harrison-
221 PM CDT Wed Jul 15 2020

...AN AREA OF STRONG THUNDERSTORMS WILL AFFECT HARRISON COUNTY...

At 221 PM CDT, strong thunderstorms were clustered near Gulfport,
moving southeast at 15 mph.

Locations impacted include...
Gulfport, Biloxi, Long Beach, Saucier, Lyman and Gulfport Airport.

Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.

LAT...LON 3042 8895 3042 8901 3041 8899 3041 8897
      3039 8896 3038 8907 3036 8909 3030 8929
      3036 8928 3038 8934 3064 8934 3064 8900
      3058 8894
TIME...MOT...LOC 1921Z 335DEG 11KT 3048 8908

KLG

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 15, 10:01 AM CDTSpecial Marine WarningLIX59 min
Jul 15, 11:23 AM CDTSpecial Weather StatementLIXOrleans37 min
Jul 15, 12:00 PM CDTSpecial Weather StatementLIXOrleans60 min
Jul 15, 12:18 PM CDTAreal Flood AdvisoryLIXJefferson, Orleans, Plaquemines, Saint Bernard117 min
Jul 15, 1:02 PM CDTSpecial Weather StatementLIXSaint Charles43 min
Jul 15, 2:58 PM CDTSpecial Marine WarningLIX47 min
Jul 15, 3:19 PM CDTSpecial Weather StatementLIXPlaquemines41 min
Jul 15, 3:42 PM CDTSpecial Marine WarningLIX48 min
Jul 15, 4:12 PM CDTSpecial Weather StatementLIXIberville63 min
Jul 15, 4:28 PM CDTAreal Flood AdvisoryLIXEast Baton Rouge, Iberville, West Baton Rouge2 hr
Jul 15, 4:35 PM CDTSpecial Marine WarningLIX55 min
Jul 15, 4:41 PM CDTSpecial Weather StatementLIXPlaquemines49 min
Jul 15, 6:18 PM CDTSpecial Weather StatementLIXOrleans87 min
Jul 15, 6:26 PM CDTSpecial Weather StatementLIXWashington64 min
Jul 15, 2:27 PM CDTSpecial Weather StatementLIXJackson78 min
Jul 15, 3:09 PM CDTAreal Flood AdvisoryLIXJackson2 hr
Jul 15, 3:29 PM CDTSevere Thunderstorm WarningLIXJackson31 min
Jul 15, 4:02 PM CDTSpecial Weather StatementLIXJackson43 min
Jul 15, 4:25 PM CDTFlash Flood WarningLIXJackson93 min
Jul 15, 4:48 PM CDTSpecial Weather StatementLIXPearl River57 min
Jul 15, 4:57 PM CDTSevere Thunderstorm WarningLIXPearl River33 min
Jul 15, 5:21 PM CDTFlash Flood WarningLIXPearl River114 min
Jul 15, 5:46 PM CDTSpecial Weather StatementLIXPearl River59 min
Jul 15, 5:59 PM CDTAreal Flood AdvisoryLIXJackson76 min

Nearby

Special Weather Statements in Mississippi, 2020Every special weather statement in 2020

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; radar from the NEXRAD Level II archive.