Alert archive / South Dakota / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 73, NWS Aberdeen, SD

July 20, 1987Jerauld County, South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Jul 20, 1987, 9:35 PM CDT for Jerauld County, South Dakota. It was in force for 55 min.

The area

The counties it named.

The facts

Issued: Jul 20, 1987, 9:35 PM CDT (02:35 UTC)
Expired: Jul 20, 1987, 10:30 PM CDT
In force: 55 min
Issued by: NWS Aberdeen, SD
Area: Whole counties

County Jerauld County, SD

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Aberdeen, SD (KHON), launched 00:00Z, 2.6 hours before the alert went out and 95 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: 2744 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 1591 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 80 m²/s²
0-3 km storm-relative helicity: 125 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 5.6

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 severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, Jul 20, 6:06 PM CDT, 3 hours 29 minutes before

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Special weather statement, Jul 20, 6:22 PM CDT, 3 hours 13 minutes before

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  <meta name="viewport" content="width=device-width, initial-scale=1">
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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.
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The office that day

Everything else NWS Aberdeen, SD issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 20, 7:22 PM CDT	Severe Thunderstorm Warning	ABR	Lyman	68 min
Jul 20, 7:32 PM CDT	Severe Thunderstorm Warning	ABR	Beadle	58 min
Jul 20, 8:28 PM CDT	Severe Thunderstorm Warning	ABR	Jerauld, Kingsbury, Miner, Sanborn	62 min
Jul 20, 8:28 PM CDT	Severe Thunderstorm Warning	ABR	Deuel, Hamlin	62 min
Jul 20, 8:28 PM CDT	Severe Thunderstorm Warning	ABR	Buffalo	62 min
Jul 21, 12:29 AM CDT	Severe Thunderstorm Warning	ABR	Miner	61 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 1987 Every severe thunderstorm warning in 1987

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.