Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 467, NWS Norman, OK

July 16, 2018Pottawatomie County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Jul 16, 2018, 2:47 PM CDT for Pottawatomie County, Oklahoma. It was in force for 28 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 16, 2018, 2:47 PM CDT (19:47 UTC)
Expired: Jul 16, 2018, 3:15 PM CDT
In force: 28 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Pottawatomie County, OK

The radar

The Norman radar (KTLX), 33 km from the middle of the area, began a volume at 19:50 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 12:00Z, 7.8 hours before the alert went out and 41 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: 362 J/kg
Mixed-layer CIN: -80 J/kg
Mixed-layer LCL: 1890 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 27 m²/s²
0-3 km storm-relative helicity: 42 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 severe thunderstorm 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 severe thunderstorm warning went out at Jul 15, 6:39 PM CDT, 20 hours 8 minutes earlier.

Area forecast discussion, Jul 15, 6:39 PM CDT, 20 hours 8 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
Jul 15, 7:31 PM CDT	Special Weather Statement	OUN	Grady	29 min
Jul 15, 7:32 PM CDT	Special Weather Statement	OUN	Canadian	28 min
Jul 15, 7:37 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Grady	38 min
Jul 15, 7:45 PM CDT	Special Weather Statement	OUN	Blaine	30 min
Jul 15, 8:02 PM CDT	Special Weather Statement	OUN	Canadian	28 min
Jul 15, 8:10 PM CDT	Severe Thunderstorm Warning	OUN	Canadian	23 min
Jul 15, 8:32 PM CDT	Special Weather Statement	OUN	Canadian	28 min
Jul 15, 9:10 PM CDT	Special Weather Statement	OUN	Kingfisher	35 min
Jul 16, 3:39 AM CDT	Heat Advisory	OUN	Atoka, Bryan, Canadian, Carter, Cleveland, Coal and 18 more	15 hr
Jul 16, 9:25 AM CDT	Special Weather Statement	OUN	Kay	50 min
Jul 16, 2:37 PM CDT	Special Weather Statement	OUN	Pottawatomie	23 min
Jul 16, 4:51 PM CDT	Special Weather Statement	OUN	Canadian	24 min
Jul 16, 6:00 PM CDT	Special Weather Statement	OUN	Harper	30 min
Jul 16, 6:28 PM CDT	Special Weather Statement	OUN	Garfield	17 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2018 Every severe thunderstorm warning in 2018

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.