Alert archive / Wyoming / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 70, NWS Cheyenne, WY

June 27, 1999Niobrara County, Wyoming

NWS Cheyenne, WY issued this severe thunderstorm warning at Jun 27, 1999, 2:08 PM MDT for Niobrara County, Wyoming. It was in force for 32 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Jun 27, 1999, 2:08 PM MDT (20:08 UTC)
Expired: Jun 27, 1999, 2:40 PM MDT
In force: 32 min
Issued by: NWS Cheyenne, WY
Area: Whole counties

County Niobrara County, WY

What was reported inside it

Time	Report	Where	Remark
Jun 27, 2:30 PM MDT	Hail 0.75	Lance Creek, WY	3/4 inch hail reported 7 miles north of Lance Creek, WY

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Rapid City, SD (KUNR), launched 12:00Z, 8.1 hours before the alert went out and 171 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: 1202 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: -11 m²/s²
0-3 km storm-relative helicity: 283 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.

NWS Cheyenne, WY wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 27, 1:00 PM MDT, 1 hour 8 minutes earlier.

Area forecast discussion, Jun 27, 1:00 PM MDT, 1 hour 8 minutes before

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In the hours before

Local storm report, Jun 27, 8:18 AM MDT, 5 hours 50 minutes before

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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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        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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The office that day

Everything else NWS Cheyenne, WY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 26, 6:26 PM MDT	Tornado Warning	CYS	Banner	34 min
Jun 26, 6:58 PM MDT	Tornado Warning	CYS	Banner, Kimball	32 min
Jun 26, 7:32 PM MDT	Tornado Warning	CYS	Cheyenne	28 min
Jun 26, 7:56 PM MDT	Tornado Warning	CYS	Cheyenne	34 min
Jun 26, 8:26 PM MDT	Tornado Warning	CYS	Cheyenne	34 min
Jun 26, 8:55 PM MDT	Flash Flood Warning	CYS	Cheyenne	5 hr
Jun 26, 9:15 PM MDT	Severe Thunderstorm Warning	CYS	Banner	50 min
Jun 26, 9:47 PM MDT	Severe Thunderstorm Warning	CYS	Banner	33 min
Jun 27, 4:42 PM MDT	Tornado Warning	CYS	Scotts Bluff, Sioux	33 min
Jun 27, 5:39 PM MDT	Tornado Warning	CYS	Scotts Bluff	16 min
Jun 27, 5:41 PM MDT	Severe Thunderstorm Warning	CYS	Morrill	34 min
Jun 26, 6:48 PM MDT	Severe Thunderstorm Warning	CYS	Converse	47 min
Jun 26, 7:05 PM MDT	Severe Thunderstorm Warning	CYS	Platte	40 min
Jun 26, 7:53 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Platte	47 min
Jun 26, 8:31 PM MDT	Severe Thunderstorm Warning	CYS	Platte	49 min
Jun 26, 8:45 PM MDT	Tornado Warning	CYS	Goshen	35 min
Jun 27, 1:41 PM MDT	Severe Thunderstorm Warning	CYS	Converse	49 min
Jun 27, 2:59 PM MDT	Severe Thunderstorm Warning	CYS	Platte	36 min
Jun 27, 3:14 PM MDT	Tornado Warning	CYS	Niobrara	31 min
Jun 27, 3:31 PM MDT	Severe Thunderstorm Warning	CYS	Platte	29 min
Jun 27, 3:37 PM MDT	Tornado Warning	CYS	Platte	33 min
Jun 27, 3:51 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	49 min
Jun 27, 4:34 PM MDT	Tornado Warning	CYS	Goshen	21 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 1999 Every severe thunderstorm warning in 1999

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.