Alert archive / Mississippi / Winter Weather Advisories in 2021

Winter Weather Advisory 4, NWS Jackson, MS

February 11, 202120 counties in Mississippi; 9 parishes in Louisiana; Ashley County, Chicot County, Arkansas

NWS Jackson, MS issued this winter weather advisory at Feb 11, 2021, 3:43 PM CST for 20 counties in Mississippi; 9 parishes in Louisiana; Ashley County, Chicot County, Arkansas. It took effect at Feb 11, 2021, 8:42 PM CST. It was in force for 15 hr.

The area

The counties it named.

The facts

Issued: Feb 11, 2021, 3:43 PM CST (21:43 UTC)
In effect from: Feb 11, 2021, 8:42 PM CST
Expired: Feb 12, 2021, 12:00 PM CST
In force: 15 hr
Issued by: NWS Jackson, MS

All 31 counties

Ashley County, AR, Chicot County, AR, Catahoula Parish, LA, Concordia Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Richland Parish, LA, Tensas Parish, LA, West Carroll Parish, LA, Adams County, MS, Bolivar County, MS, Carroll County, MS, Claiborne County, MS, Franklin County, MS, Grenada County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Jefferson County, MS, Leflore County, MS, Madison County, MS, Montgomery County, MS, Rankin County, MS, Sharkey County, MS, Sunflower County, MS, Warren County, MS, Washington County, MS, Yazoo County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 95 km from the middle of the area, began a volume at 21:45 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

Jackson, MS (KJAN), launched 12:00Z, 9.7 hours before the alert went out and 85 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 398 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 250 m²/s²
0-3 km storm-relative helicity: 347 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.8

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this winter weather advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Jackson, MS wrote its last area forecast discussion before this winter weather advisory went out at Feb 11, 12:47 PM CST, 2 hours 56 minutes earlier.

Area forecast discussion, Feb 11, 12:47 PM CST, 2 hours 56 minutes before

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Hazardous weather outlook, Feb 11, 6:26 AM CST, 9 hours 17 minutes before

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In the hours before

Local storm report, Feb 11, 11:54 AM CST, 3 hours 49 minutes before

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        The site you requested is temporarily down for maintenance or an unexpected outage.
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      <p id="message2">
        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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Local storm report, Feb 11, 12:57 PM CST, 2 hours 46 minutes before

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  <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.
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      <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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Local storm report, Feb 11, 1:00 PM CST, 2 hours 43 minutes before

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      <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.
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      <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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Local storm report, Feb 11, 1:02 PM CST, 2 hours 41 minutes before

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      <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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Local storm report, Feb 11, 1:09 PM CST, 2 hours 34 minutes before

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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>
      <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>
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Local storm report, Feb 11, 2:18 PM CST, 1 hour 25 minutes before

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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.
      </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>

The office that day

Everything else NWS Jackson, MS issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Feb 11, 1:34 AM CST	Special Weather Statement	JAN	Jefferson Davis, Lawrence	41 min
Feb 11, 2:10 AM CST	Special Weather Statement	JAN	Copiah	50 min
Feb 11, 2:45 AM CST	Special Weather Statement	JAN	Smith	45 min
Feb 11, 3:28 AM CST	Special Weather Statement	JAN	Scott	47 min
Feb 11, 3:40 AM CST	Severe Thunderstorm Warning	JAN	Leake, Neshoba, Newton, Scott	50 min
Feb 11, 4:11 AM CST	Special Weather Statement	JAN	Winston	49 min
Feb 11, 4:16 AM CST	Special Weather Statement	JAN	Lamar, Marion	44 min
Feb 11, 4:57 AM CST	Special Weather Statement	JAN	Lamar	48 min
Feb 11, 8:42 AM CST	Flash Flood Warning	JAN	Jones	4 hr
Feb 11, 8:47 AM CST	Flash Flood Warning	JAN	Forrest, Jefferson Davis, Lamar, Marion	4 hr
Feb 11, 9:26 AM CST	Special Weather Statement	JAN	Forrest, Lamar	49 min
Feb 11, 11:15 AM CST	River Flood Warning	JAN	Attala, Holmes	32 hr

Nearby

Winter Weather Advisories in Mississippi, 2021 Winter Weather Advisories in Louisiana, 2021 Winter Weather Advisories in Arkansas, 2021 Every winter weather advisory in 2021

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.