Alert archive / Montana / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 280, NWS Billings, MT

July 27, 2001Golden Valley County, Montana

NWS Billings, MT issued this severe thunderstorm warning at Jul 27, 2001, 8:20 PM MDT for Golden Valley County, Montana. It was in force for 55 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
Jul 27, 2001, 8:20 PM MDT (02:20 UTC)
Expired
Jul 27, 2001, 9:15 PM MDT
In force
55 min
Issued by
NWS Billings, MT
Area
Whole counties

County Golden Valley County, MT

The radar

The Billings radar (KBLX), 73 km from the middle of the area, began a volume at 02:21 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.

What was reported inside it

TimeReportWhereRemark
Jul 27, 9:00 PM MDTHail 0.75Ryegate, MT

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

Riverton, WY (KRIW), launched 00:00Z, 2.3 hours before the alert went out and 373 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-pSkew-T log-p diagram, Riverton, WY at 00:00Z on 2001-07-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 58 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Riverton, WY at 00:00Z on 2001-07-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 21 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
58 J/kg
Mixed-layer CIN
-10 J/kg
Mixed-layer LCL
4087 m above ground
0-6 km bulk shear
12 kt
0-1 km storm-relative helicity
21 m²/s²
0-3 km storm-relative helicity
52 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 Billings, MT wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 27, 8:00 PM MDT, 20 minutes earlier.

Area forecast discussion, Jul 27, 8:00 PM MDT, 20 minutes before
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In the hours before

Local storm report, Jul 27, 6:14 PM MDT, 2 hours 6 minutes before
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    <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>
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        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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      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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Local storm report, Jul 27, 6:20 PM MDT, 2 hours before
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<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.
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The office that day

Everything else NWS Billings, MT issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 27, 8:53 PM MDTSevere Thunderstorm WarningBYZStillwater, Yellowstone67 min
Jul 27, 9:00 PM MDTSevere Thunderstorm WarningBYZMusselshell60 min
Jul 27, 9:22 PM MDTSevere Thunderstorm WarningBYZCarbon38 min
Jul 27, 9:52 PM MDTSevere Thunderstorm WarningBYZBig Horn53 min
Jul 27, 10:00 PM MDTSevere Thunderstorm WarningBYZYellowstone60 min
Jul 27, 10:49 PM MDTSevere Thunderstorm WarningBYZBig Horn56 min
Jul 27, 11:10 PM MDTSevere Thunderstorm WarningBYZTreasure, Yellowstone65 min
Jul 27, 11:38 PM MDTSevere Thunderstorm WarningBYZRosebud, Treasure67 min
Jul 28, 1:15 AM MDTSevere Thunderstorm WarningBYZCuster60 min
Jul 28, 1:47 AM MDTSevere Thunderstorm WarningBYZCuster, Powder River58 min
Jul 28, 2:25 AM MDTSevere Thunderstorm WarningBYZCarter, Fallon80 min
Jul 28, 3:53 AM MDTSevere Thunderstorm WarningBYZFallon67 min
Jul 28, 3:20 PM MDTSevere Thunderstorm WarningBYZBig Horn, Yellowstone55 min
Jul 28, 4:07 PM MDTSevere Thunderstorm WarningBYZTreasure38 min
Jul 28, 4:15 PM MDTSevere Thunderstorm WarningBYZMusselshell, Rosebud60 min
Jul 28, 4:40 PM MDTSevere Thunderstorm WarningBYZRosebud60 min
Jul 28, 5:40 PM MDTSevere Thunderstorm WarningBYZCuster, Rosebud60 min
Jul 28, 3:14 PM MDTSevere Thunderstorm WarningBYZSheridan61 min

Nearby

Severe Thunderstorm Warnings in Montana, 2001Every severe thunderstorm warning in 2001

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; radar from the NEXRAD Level II archive.