Alert archive / Mississippi / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 86, NWS New Orleans, LA

July 15, 2020Jackson County, Mississippi

NWS New Orleans, LA issued this severe thunderstorm warning at Jul 15, 2020, 3:29 PM CDT for Jackson County, Mississippi. It was in force for 31 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: Jul 15, 2020, 3:29 PM CDT (20:29 UTC)
Expired: Jul 15, 2020, 4:00 PM CDT
In force: 31 min
Issued by: NWS New Orleans, LA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Jackson County, MS

The radar

The Mobile radar (KMOB), 44 km from the middle of the area, began a volume at 20:32 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, 8.5 hours before the alert went out and 106 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: 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

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 Jul 15, 12:21 PM CDT, 3 hours 8 minutes earlier.

Area forecast discussion, Jul 15, 12:21 PM CDT, 3 hours 8 minutes before

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In the hours before

Special weather statement, Jul 15, 11:23 AM CDT, 4 hours 6 minutes before

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<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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Special weather statement, Jul 15, 12:00 PM CDT, 3 hours 29 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.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

Special weather statement, Jul 15, 1:02 PM CDT, 2 hours 27 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, 1 hour 8 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

Special weather statement, Jul 15, 2:27 PM CDT, 1 hour 2 minutes before

Special Weather Statement
National Weather Service New Orleans LA
227 PM CDT Wed Jul 15 2020

MSZ082-152045-
Jackson-
227 PM CDT Wed Jul 15 2020

...A CLUSTER OF STRONG THUNDERSTORMS WILL AFFECT JACKSON COUNTY...

At 226 PM CDT, radar indicated strong thunderstorms were located
along an westward surging outflow boundary extending from near
Hurley to near Wade to near Helena. Movement was west at 20 mph.

Winds in excess of 40 mph are possible with these storms.

Locations impacted include...
Moss Point, Escatawpa, Gautier, Wade, Helena, Big Point, Hurley,
Vancleave and Hickory Hills.

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

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

LAT...LON 3036 8845 3033 8845 3032 8850 3034 8851
      3034 8857 3037 8859 3036 8860 3037 8862
      3036 8861 3037 8863 3036 8868 3066 8889
      3073 8889 3074 8842 3046 8840 3038 8841
      3035 8839
TIME...MOT...LOC 1926Z 111DEG 19KT 3073 8852 3060 8856 3044 8847

KLG

Special weather statement, Jul 15, 3:19 PM CDT, 10 minutes before

Special Weather Statement
National Weather Service New Orleans LA
319 PM CDT Wed Jul 15 2020

LAZ069-152100-
Lower Plaquemines-
319 PM CDT Wed Jul 15 2020

...A STRONG THUNDERSTORM WILL AFFECT SOUTHEASTERN PLAQUEMINES
PARISH...

At 318 PM CDT, a strong thunderstorm was located near Venice, or 30
miles southeast of Port Sulphur. The storm is nearly stationary.

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

Locations impacted include...
Venice and Boothville-venice.

Weak, short-lived waterspouts may be possible with any storm in this
area. If you see a waterspout, seek shelter until the storm passes.

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

LAT...LON 2912 8942 2935 8933 2935 8930 2933 8918
      2929 8914 2927 8921 2919 8909 2915 8924
      2914 8917 2913 8916 2904 8931 2915 8927
      2912 8932 2919 8934 2915 8940 2913 8933
      2903 8933
TIME...MOT...LOC 2018Z 326DEG 4KT 2925 8931

KLG

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 15, 10:01 AM CDT	Special Marine Warning	LIX		59 min
Jul 15, 11:23 AM CDT	Special Weather Statement	LIX	Orleans	37 min
Jul 15, 12:00 PM CDT	Special Weather Statement	LIX	Orleans	60 min
Jul 15, 12:18 PM CDT	Areal Flood Advisory	LIX	Jefferson, Orleans, Plaquemines, Saint Bernard	117 min
Jul 15, 1:02 PM CDT	Special Weather Statement	LIX	Saint Charles	43 min
Jul 15, 2:58 PM CDT	Special Marine Warning	LIX		47 min
Jul 15, 3:19 PM CDT	Special Weather Statement	LIX	Plaquemines	41 min
Jul 15, 3:42 PM CDT	Special Marine Warning	LIX		48 min
Jul 15, 4:12 PM CDT	Special Weather Statement	LIX	Iberville	63 min
Jul 15, 4:28 PM CDT	Areal Flood Advisory	LIX	East Baton Rouge, Iberville, West Baton Rouge	2 hr
Jul 15, 4:35 PM CDT	Special Marine Warning	LIX		55 min
Jul 15, 4:41 PM CDT	Special Weather Statement	LIX	Plaquemines	49 min
Jul 15, 6:18 PM CDT	Special Weather Statement	LIX	Orleans	87 min
Jul 15, 6:26 PM CDT	Special Weather Statement	LIX	Washington	64 min
Jul 15, 2:21 PM CDT	Special Weather Statement	LIX	Harrison	69 min
Jul 15, 2:27 PM CDT	Special Weather Statement	LIX	Jackson	78 min
Jul 15, 3:09 PM CDT	Areal Flood Advisory	LIX	Jackson	2 hr
Jul 15, 4:02 PM CDT	Special Weather Statement	LIX	Jackson	43 min
Jul 15, 4:25 PM CDT	Flash Flood Warning	LIX	Jackson	93 min
Jul 15, 4:48 PM CDT	Special Weather Statement	LIX	Pearl River	57 min
Jul 15, 4:57 PM CDT	Severe Thunderstorm Warning	LIX	Pearl River	33 min
Jul 15, 5:21 PM CDT	Flash Flood Warning	LIX	Pearl River	114 min
Jul 15, 5:46 PM CDT	Special Weather Statement	LIX	Pearl River	59 min
Jul 15, 5:59 PM CDT	Areal Flood Advisory	LIX	Jackson	76 min

Nearby

Severe Thunderstorm Warnings in Mississippi, 2020 Every severe thunderstorm warning 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.