Alert archive / Mississippi / Flash Flood Watches in 2008

Flash Flood Watch 1, NWS Jackson, MS

February 21, 200818 counties in Mississippi; 6 parishes in Louisiana

NWS Jackson, MS issued this flash flood watch at Feb 21, 2008, 9:25 AM CST for 18 counties in Mississippi; 6 parishes in Louisiana. It was in force for 20 hr.

The area

The counties it named.

The facts

Issued: Feb 21, 2008, 9:25 AM CST (15:25 UTC)
Expired: Feb 22, 2008, 5:26 AM CST
In force: 20 hr
Issued by: NWS Jackson, MS
Flood severity: None

All 24 counties

Catahoula Parish, LA, Concordia Parish, LA, Franklin Parish, LA, Madison Parish, LA, Richland Parish, LA, Tensas Parish, LA, Adams County, MS, Claiborne County, MS, Copiah County, MS, Franklin County, MS, Hinds County, MS, Jefferson County, MS, Kemper County, MS, Lauderdale County, MS, Leake County, MS, Lincoln County, MS, Madison County, MS, Neshoba County, MS, Newton County, MS, Rankin County, MS, Scott County, MS, Simpson County, MS, Smith County, MS, Warren County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 44 km from the middle of the area, began a volume at 15:27 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, 3.4 hours before the alert went out and 38 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: 579 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 239 m²/s²
0-3 km storm-relative helicity: 450 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 flash flood watch 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 flash flood watch went out at Feb 21, 5:45 AM CST, 3 hours 40 minutes earlier.

Area forecast discussion, Feb 21, 5:45 AM CST, 3 hours 40 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>

Hazardous weather outlook, Feb 21, 6:27 AM CST, 2 hours 58 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>

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 21, 10:43 AM CST	Flash Flood Warning	JAN	Hinds, Madison, Rankin	3 hr
Feb 21, 2:53 PM CST	Severe Thunderstorm Warning	JAN	Kemper	29 min
Feb 21, 4:41 PM CST	Severe Thunderstorm Warning	JAN	Newton, Rankin, Scott, Smith	49 min
Feb 21, 5:09 PM CST	Severe Thunderstorm Warning	JAN	Claiborne, Hinds, Warren	51 min
Feb 21, 5:14 PM CST	Severe Thunderstorm Warning	JAN	Leake, Neshoba, Newton, Scott	35 min
Feb 21, 5:50 PM CST	Severe Thunderstorm Warning	JAN	Hinds, Madison, Rankin	21 min
Feb 21, 5:54 PM CST	Severe Thunderstorm Warning	JAN	Concordia	6 min

Nearby

Flash Flood Watches in Mississippi, 2008 Flash Flood Watches in Louisiana, 2008 Every flash flood watch in 2008

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.