Alert archive / Oklahoma / Flash Flood Warnings in 1998

Flash Flood Warning 11, NWS Norman, OK

April 26, 1998Seminole County, Oklahoma

NWS Norman, OK issued this flash flood warning at Apr 26, 1998, 9:45 PM CDT for Seminole County, Oklahoma. It was in force for 2 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, 1998, 9:45 PM CDT (02:45 UTC)
Expired: Apr 27, 1998, 12:00 AM CDT
In force: 2 hr
Issued by: NWS Norman, OK
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Seminole County, OK

The radar

The Norman radar (KTLX), 63 km from the middle of the area, began a volume at 02:45 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

Norman, OK (KOUN), launched 00:00Z, 2.8 hours before the alert went out and 72 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: 542 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 264 m²/s²
0-3 km storm-relative helicity: 297 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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, 9:32 PM CDT, 13 minutes earlier.

Area forecast discussion, Apr 26, 9:32 PM CDT, 13 minutes before

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In the hours before

Local storm report, Apr 26, 8:45 PM CDT, 1 hour before

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Local storm report, Apr 26, 8:45 PM CDT, 1 hour before

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Local storm report, Apr 26, 9:20 PM CDT, 25 minutes before

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Local storm report, Apr 26, 9:20 PM CDT, 25 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.
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Local storm report, Apr 26, 9:20 PM CDT, 25 minutes before

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<body>
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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.
      </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, Apr 26, 9:20 PM CDT, 25 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.
      </p>
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The office that day

Everything else NWS Norman, OK issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 26, 7:43 PM CDT	Severe Thunderstorm Warning	OUN	Johnston	47 min
Apr 26, 8:25 PM CDT	Severe Thunderstorm Warning	OUN	Atoka	50 min
Apr 26, 8:30 PM CDT	Flash Flood Warning	OUN	Garvin	3 hr

Nearby

Flash Flood Warnings in Oklahoma, 1998 Every flash flood warning in 1998

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.