Alert archive / Oklahoma / Flash Flood Warnings in 1999

Flash Flood Warning 16, NWS Norman, OK

April 26, 19994 counties in Oklahoma

NWS Norman, OK issued this flash flood warning at Apr 26, 1999, 9:11 AM CDT for 4 counties in Oklahoma. 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: Apr 26, 1999, 9:11 AM CDT (14:11 UTC)
Expired: Apr 26, 1999, 12:15 PM CDT
In force: 3 hr
Issued by: NWS Norman, OK
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Hughes County, OK, Pontotoc County, OK, Pottawatomie County, OK, Seminole County, OK

The nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 2.2 hours before the alert went out and 73 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: 518 J/kg
Mixed-layer CIN: -59 J/kg
Mixed-layer LCL: 644 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 58 m²/s²
0-3 km storm-relative helicity: 54 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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 Norman, OK wrote its last area forecast discussion before this flash flood warning went out at Apr 26, 3:35 AM CDT, 5 hours 36 minutes earlier.

Area forecast discussion, Apr 26, 3:35 AM CDT, 5 hours 36 minutes before

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In the hours before

Special weather statement, Apr 26, 6:35 AM CDT, 2 hours 36 minutes before

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<head>
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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.
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Special weather statement, Apr 26, 6:35 AM CDT, 2 hours 36 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>
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Special weather statement, Apr 26, 8:00 AM CDT, 1 hour 11 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>

Special weather statement, Apr 26, 8:00 AM CDT, 1 hour 11 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 Norman, OK issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 26, 9:11 AM CDT	Flash Flood Warning	OUN	Coal	3 hr
Apr 26, 3:19 PM CDT	Severe Thunderstorm Warning	OUN	Grady, McClain	41 min
Apr 26, 3:54 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, McClain	51 min
Apr 26, 4:19 PM CDT	Severe Thunderstorm Warning	OUN	Pottawatomie	41 min
Apr 26, 4:40 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Grady	35 min
Apr 26, 4:46 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, McClain	29 min
Apr 26, 5:14 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, McClain	31 min
Apr 26, 5:21 PM CDT	Severe Thunderstorm Warning	OUN	Seminole	24 min
Apr 26, 5:42 PM CDT	Severe Thunderstorm Warning	OUN	Hughes, Pontotoc, Seminole	33 min
Apr 26, 5:48 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, McClain, Pottawatomie	42 min
Apr 26, 5:56 PM CDT	Flash Flood Warning	OUN	Seminole	3 hr
Apr 26, 6:14 PM CDT	Severe Thunderstorm Warning	OUN	Hughes	46 min
Apr 26, 6:31 PM CDT	Severe Thunderstorm Warning	OUN	Dewey, Major	34 min

Nearby

Flash Flood Warnings in Oklahoma, 1999 Every flash flood warning in 1999

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.