Alert archive / Louisiana / Excessive Heat Warnings in 2020

Excessive Heat Warning 2, NWS New Orleans, LA

July 13, 2020Saint Bernard Parish, Saint James Parish, Saint John the Baptist Parish, Louisiana

NWS New Orleans, LA issued this excessive heat warning at Jul 13, 2020, 3:54 AM CDT for Saint Bernard Parish, Saint James Parish, Saint John the Baptist Parish, Louisiana. It took effect at Jul 13, 2020, 10:00 AM CDT. It was in force for 10 hr. 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 13, 2020, 3:54 AM CDT (08:54 UTC)
In effect from
Jul 13, 2020, 10:00 AM CDT
Expired
Jul 13, 2020, 8:00 PM CDT
In force
10 hr
Issued by
NWS New Orleans, LA

Counties Saint Bernard Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 8.9 hours before the alert went out and 69 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 00:00Z on 2020-07-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2514 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 00:00Z on 2020-07-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 62 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
2514 J/kg
Mixed-layer CIN
-28 J/kg
Mixed-layer LCL
1455 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
62 m²/s²
0-3 km storm-relative helicity
67 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 excessive heat 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 excessive heat warning went out at Jul 12, 11:51 PM CDT, 4 hours 3 minutes earlier.

Area forecast discussion, Jul 12, 11:51 PM CDT, 4 hours 3 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

Special weather statement, Jul 13, 2:09 AM CDT, 1 hour 45 minutes before
Special Weather Statement
National Weather Service New Orleans LA
209 AM CDT Mon Jul 13 2020

MSZ082-130815-
Jackson-
209 AM CDT Mon Jul 13 2020

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT NORTHERN JACKSON
COUNTY...

At 209 AM CDT, radar indicated strong thunderstorms were located
along a line extending from 15 miles east of Perkinston to near
Tanner Williams, Alabama. Movement was east at 15 mph.

Winds in excess of 30 mph are possible with these storms.

Locations impacted include...
Big Point, Hurley, Wade and Vancleave.

If outdoors, consider seeking shelter inside a building.

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 3058 8888 3071 8889 3073 8888 3074 8842
      3072 8841 3061 8840 3056 8841
TIME...MOT...LOC 0709Z 282DEG 13KT 3074 8888 3074 8842

24/RR
Special weather statement, Jul 13, 2:26 AM CDT, 1 hour 28 minutes before
Special Weather Statement
National Weather Service New Orleans LA
226 AM CDT Mon Jul 13 2020

MSZ081-082-130800-
Jackson-Harrison-
226 AM CDT Mon Jul 13 2020

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT NORTHEASTERN HARRISON
AND JACKSON COUNTIES...

At 226 AM CDT, radar indicated strong thunderstorms were located
along a line extending from near Big Point to near Vancleave to 16
miles east of Perkinston. Movement was south at 15 mph.

Winds in excess of 30 mph are possible with these storms.

Locations impacted include...
Biloxi, Ocean Springs, Moss Point, St. Martin, Escatawpa, Gautier,
D'iberville, Wade, Latimer, Big Point, Helena, Gulf Hills, Hurley,
Vancleave, Gulf Park Estates and Hickory Hills.

LAT...LON 3037 8841 3038 8881 3043 8885 3043 8891
      3040 8886 3039 8886 3040 8896 3042 8896
      3042 8891 3043 8896 3063 8899 3068 8897
      3067 8889 3073 8888 3073 8876 3068 8871
      3068 8841
TIME...MOT...LOC 0726Z 004DEG 13KT 3062 8843 3062 8872 3077 8886

24/RR

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 12, 8:56 PM CDTSpecial Marine WarningLIX94 min
Jul 12, 10:13 PM CDTSpecial Marine WarningLIX92 min
Jul 13, 2:56 AM CDTSpecial Marine WarningLIX34 min
Jul 13, 3:57 AM CDTSpecial Marine WarningLIX33 min
Jul 13, 4:29 AM CDTSpecial Marine WarningLIX31 min
Jul 13, 5:40 AM CDTSpecial Marine WarningLIX22 min
Jul 13, 5:55 AM CDTSpecial Weather StatementLIXOrleans35 min
Jul 13, 6:59 AM CDTSpecial Weather StatementLIXOrleans31 min
Jul 13, 7:01 AM CDTSpecial Marine WarningLIX44 min
Jul 13, 3:28 PM CDTSpecial Weather StatementLIXJefferson32 min
Jul 13, 3:38 PM CDTSpecial Marine WarningLIX37 min
Jul 13, 3:40 PM CDTHeat AdvisoryLIXAssumption, East Baton Rouge, East Feliciana, Iberville, Pointe Coupee, Saint Bernard and 7 more28 hr
Jul 13, 4:19 PM CDTSpecial Weather StatementLIXLafourche41 min
Jul 13, 5:13 PM CDTSpecial Weather StatementLIXJefferson32 min
Jul 13, 5:28 PM CDTSpecial Weather StatementLIXSaint Charles47 min
Jul 13, 5:39 PM CDTSpecial Weather StatementLIXIberville36 min
Jul 13, 6:03 PM CDTSpecial Weather StatementLIXLafourche27 min
Jul 13, 6:10 PM CDTSevere Thunderstorm WarningLIXLafourche, Terrebonne35 min
Jul 13, 6:41 PM CDTSpecial Marine WarningLIX49 min
Jul 13, 6:45 PM CDTSpecial Weather StatementLIXTerrebonne30 min
Jul 12, 7:53 PM CDTSpecial Weather StatementLIXAmite37 min
Jul 12, 9:17 PM CDTSpecial Weather StatementLIXJackson28 min
Jul 13, 2:09 AM CDTSpecial Weather StatementLIXJackson66 min
Jul 13, 2:26 AM CDTSpecial Weather StatementLIXJackson34 min
Jul 13, 5:53 AM CDTSpecial Weather StatementLIXHarrison37 min
Jul 13, 6:25 AM CDTSpecial Weather StatementLIXHancock35 min
Jul 13, 6:56 AM CDTFlash Flood WarningLIXHancock, Harrison, Pearl River2 hr
Jul 13, 7:55 AM CDTFlash Flood WarningLIXJackson110 min

Nearby

Excessive Heat Warnings in Louisiana, 2020Every excessive heat 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.