Alert archive / Mississippi / Flash Flood Warnings in 2009

Flash Flood Warning 189, NWS Memphis, TN

September 18, 2009Coahoma County, Quitman County, Tallahatchie County, Mississippi

NWS Memphis, TN issued this flash flood warning at Sep 18, 2009, 2:52 AM CDT for Coahoma County, Quitman County, Tallahatchie County, Mississippi. It was in force for 3 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
Sep 18, 2009, 2:52 AM CDT (07:52 UTC)
Expired
Sep 18, 2009, 6:00 AM CDT
In force
3 hr
Issued by
NWS Memphis, TN
Area
Storm-based polygon
Flood severity
None

Counties Coahoma County, MS, Quitman County, MS, Tallahatchie County, MS

The radar

The Memphis radar (KNQA), 141 km from the middle of the area, began a volume at 07:55 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

Little Rock, AR (KLZK), launched 00:00Z, 7.9 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-pSkew-T log-p diagram, Little Rock, AR at 00:00Z on 2009-09-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 482 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, Little Rock, AR at 00:00Z on 2009-09-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 61 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
482 J/kg
Mixed-layer CIN
-7 J/kg
Mixed-layer LCL
473 m above ground
0-6 km bulk shear
5 kt
0-1 km storm-relative helicity
61 m²/s²
0-3 km storm-relative helicity
86 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 warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Memphis, TN wrote its last area forecast discussion before this flash flood warning went out at Sep 17, 11:46 PM CDT, 3 hours 6 minutes earlier.

Area forecast discussion, Sep 17, 11:46 PM CDT, 3 hours 6 minutes before
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Hazardous weather outlook, Sep 17, 3:11 PM CDT, 11 hours 41 minutes before
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  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
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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.
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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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The office that day

Everything else NWS Memphis, TN issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 18, 4:24 AM CDTFlash Flood WarningMEGCoahoma3 hr
Sep 18, 6:00 AM CDTFlash Flood WarningMEGCoahoma, Quitman, Tallahatchie3 hr
Sep 18, 7:41 AM CDTFlash Flood WarningMEGAlcorn, Tishomingo3 hr
Sep 18, 8:58 AM CDTFlash Flood WarningMEGPanola, Quitman, Tallahatchie, Tate, Yalobusha3 hr
Sep 18, 9:53 AM CDTFlash Flood WarningMEGDeSoto, Marshall, Tate, Tunica3 hr
Sep 18, 11:55 AM CDTFlash Flood WarningMEGBenton, Calhoun, Lafayette, Marshall, Pontotoc, Union and 1 more3 hr
Sep 18, 12:07 PM CDTAreal Flood AdvisoryMEGItawamba113 min
Sep 18, 12:40 PM CDTFlash Flood WarningMEGAlcorn, Tippah3 hr
Sep 18, 1:52 PM CDTFlash Flood WarningMEGBenton, Calhoun, Chickasaw, Pontotoc, Tippah, Union3 hr
Sep 18, 3:38 PM CDTFlash Flood WarningMEGAlcorn, Itawamba, Lee, Prentiss, Tippah, Tishomingo and 1 more3 hr
Sep 18, 10:38 AM CDTFlash Flood WarningMEGDecatur3 hr
Sep 18, 6:09 AM CDTFlash Flood WarningMEGLee, St. Francis3 hr

Nearby

Flash Flood Warnings in Mississippi, 2009Every flash flood warning in 2009

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.