Alert archive / Kansas / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 282, NWS Topeka, KS

August 18, 2019Jefferson County, Kansas

NWS Topeka, KS issued this severe thunderstorm warning at Aug 18, 2019, 2:04 AM CDT for Jefferson County, Kansas. It was in force for 26 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: Aug 18, 2019, 2:04 AM CDT (07:04 UTC)
Expired: Aug 18, 2019, 2:30 AM CDT
In force: 26 min
Issued by: NWS Topeka, KS
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

County Jefferson County, KS

The radar

The Topeka radar (KTWX), 78 km from the middle of the area, began a volume at 07:04 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

Topeka, KS (KTOP), launched 00:00Z, 7.1 hours before the alert went out and 34 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: 2409 J/kg
Mixed-layer CIN: -142 J/kg
Mixed-layer LCL: 1516 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 64 m²/s²
0-3 km storm-relative helicity: 74 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 4.2

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 Topeka, KS wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 17, 6:46 PM CDT, 7 hours 18 minutes earlier.

Area forecast discussion, Aug 17, 6:46 PM CDT, 7 hours 18 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, Aug 17, 3:49 PM CDT, 10 hours 15 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 Topeka, KS issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 17, 10:40 PM CDT	Special Weather Statement	TOP	Ottawa	50 min
Aug 17, 11:15 PM CDT	Severe Thunderstorm Warning	TOP	Dickinson	45 min
Aug 17, 11:56 PM CDT	Special Weather Statement	TOP	Dickinson, Geary	34 min
Aug 18, 12:05 AM CDT	Special Weather Statement	TOP	Nemaha	25 min
Aug 18, 12:16 AM CDT	Special Weather Statement	TOP	Morris	29 min
Aug 18, 12:32 AM CDT	Special Weather Statement	TOP	Brown	13 min
Aug 18, 12:39 AM CDT	Special Weather Statement	TOP	Nemaha	36 min
Aug 18, 1:00 AM CDT	Special Weather Statement	TOP	Lyon	30 min
Aug 18, 1:18 AM CDT	Special Weather Statement	TOP	Coffey	42 min
Aug 18, 1:19 AM CDT	Special Weather Statement	TOP	Jefferson	41 min
Aug 18, 1:59 AM CDT	Special Weather Statement	TOP	Jefferson	31 min
Aug 18, 2:38 PM CDT	Heat Advisory	TOP	Anderson, Clay, Coffey, Dickinson, Douglas, Franklin and 11 more	29 hr
Aug 18, 2:38 PM CDT	Heat Advisory	TOP	Anderson, Brown, Clay, Cloud, Coffey, Dickinson and 17 more	54 hr

Nearby

Severe Thunderstorm Warnings in Kansas, 2019 Every severe thunderstorm warning in 2019

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.