Alert archive / Wyoming / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 86, NWS Cheyenne, WY

August 12, 1986Weston County, Wyoming

NWS Cheyenne, WY issued this severe thunderstorm warning at Aug 12, 1986, 5:15 PM MDT for Weston County, Wyoming. It was in force for 60 min.

The area

The counties it named.

The facts

Issued: Aug 12, 1986, 5:15 PM MDT (23:15 UTC)
Expired: Aug 12, 1986, 6:15 PM MDT
In force: 60 min
Issued by: NWS Cheyenne, WY
Area: Whole counties

County Weston County, WY

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

Rapid City, SD (KRAP), launched 12:00Z, 11.3 hours before the alert went out and 137 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: 315 J/kg
Mixed-layer CIN: -148 J/kg
Mixed-layer LCL: 2188 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 14 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

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, Aug 12, 12:39 PM MDT, 4 hours 36 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
1235 PM MDT TUE AUG 12 1986

...SEVERAL STRONG THUNDERSTORMS IN ALBANY COUNTY...

AT 1230PM CHEYENNE RADAR INDICATED SEVERAL STRONG THUNDERSTORMS IN
ALBANY COUNTY.  THE STRONGEST STORM WAS ABOUT 5 MILES NORTH OF ROCK
RIVER.

STRONG GUSTY WINDS...BRIEFLY HEAVY RAIN AND SMALL HAIL SHOULD BE
EXPECTED WITH THE HEAVIER THUNDERSTORMS IN ALBANY COUNTY.

MOVEMENT WAS TO THE EAST AT AN UNDETgERMINED SPEED.
COX

Special weather statement, Aug 12, 3:40 PM MDT, 1 hour 35 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, Aug 12, 4:43 PM MDT, 32 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 Cheyenne, WY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 11, 9:59 PM MDT	Severe Thunderstorm Warning	CYS	Sioux	61 min
Aug 11, 11:00 PM MDT	Severe Thunderstorm Warning	CYS	Sheridan	60 min
Aug 12, 2:20 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	30 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 1986 Every severe thunderstorm warning in 1986

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.