Alert archive / Montana / Tornado Warnings in 2010

Tornado Warning 32, NWS Billings, MT

August 30, 2010Big Horn County, Montana; Sheridan County, Wyoming

NWS Billings, MT issued this tornado warning at Aug 30, 2010, 1:43 PM MDT for Big Horn County, Montana; Sheridan County, Wyoming. It was in force for 17 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 30, 2010, 1:43 PM MDT (19:43 UTC)
Expired: Aug 30, 2010, 2:00 PM MDT
In force: 17 min
Issued by: NWS Billings, MT
Area: Storm-based polygon

Counties Big Horn County, MT, Sheridan County, WY

The radar

The Billings radar (KBLX), 139 km from the middle of the area, began a volume at 19:43 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Aug 30, 1:04 PM MDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Riverton, WY (KRIW), launched 12:00Z, 7.7 hours before the alert went out and 246 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: 68 J/kg
Mixed-layer CIN: -107 J/kg
Mixed-layer LCL: 1351 m above ground
0-6 km bulk shear: 62 kt
0-1 km storm-relative helicity: 99 m²/s²
0-3 km storm-relative helicity: 30 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 tornado warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Billings, MT wrote its last area forecast discussion before this tornado warning went out at Aug 30, 1:25 PM MDT, 18 minutes earlier.

Area forecast discussion, Aug 30, 1:25 PM MDT, 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 30, 1:32 PM MDT, 11 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 Billings, MT issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 29, 6:46 PM MDT	Severe Thunderstorm Warning	BYZ	Carter	29 min
Aug 29, 7:19 PM MDT	Special Weather Statement	BYZ	Big Horn	56 min
Aug 29, 7:49 PM MDT	Severe Thunderstorm Warning	BYZ	Big Horn	47 min
Aug 29, 7:59 PM MDT	Severe Thunderstorm Warning	BYZ	Big Horn, Rosebud	61 min
Aug 29, 8:09 PM MDT	Special Weather Statement	BYZ	Rosebud	66 min
Aug 29, 10:06 PM MDT	Special Weather Statement	BYZ	Custer	54 min
Aug 29, 10:57 PM MDT	Special Weather Statement	BYZ	Fallon	63 min
Aug 30, 2:01 PM MDT	Special Weather Statement	BYZ	Big Horn	59 min
Aug 30, 3:32 PM MDT	Special Weather Statement	BYZ	Powder River	58 min
Aug 30, 4:28 PM MDT	Special Weather Statement	BYZ	Carter	62 min
Aug 30, 5:41 PM MDT	Special Weather Statement	BYZ	Fallon	34 min

Nearby

Tornado Warnings in Montana, 2010 Tornado Warnings in Wyoming, 2010 Every tornado warning in 2010 Tornadoes in 2010

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.