Alert archive / Montana / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 12, NWS Great Falls, MT

June 18, 2019Toole County, Montana

NWS Great Falls, MT issued this severe thunderstorm warning at Jun 18, 2019, 12:49 PM MDT for Toole County, Montana. It was in force for 26 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: Jun 18, 2019, 12:49 PM MDT (18:49 UTC)
Expired: Jun 18, 2019, 1:15 PM MDT
In force: 26 min
Issued by: NWS Great Falls, MT
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Toole County, MT

The radar

The Great Falls radar (KTFX), 135 km from the middle of the area, began a volume at 18:48 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 nearest sounding before it

Great_falls, MT (KTFX), launched 12:00Z, 6.8 hours before the alert went out and 156 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: 1523 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 81 m²/s²
0-3 km storm-relative helicity: 113 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 severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Great Falls, MT wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 18, 11:50 AM MDT, 59 minutes earlier.

Area forecast discussion, Jun 18, 11:50 AM MDT, 59 minutes before

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In the hours before

Special weather statement, Jun 18, 12:22 PM MDT, 27 minutes 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 Great Falls, MT issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 18, 12:22 PM MDT	Special Weather Statement	TFX	Toole	38 min
Jun 18, 1:14 PM MDT	Special Weather Statement	TFX	Toole	46 min
Jun 18, 1:54 PM MDT	Special Weather Statement	TFX	Toole	51 min
Jun 18, 1:58 PM MDT	Special Weather Statement	TFX	Cascade	62 min
Jun 18, 2:03 PM MDT	Special Weather Statement	TFX	Blaine	27 min
Jun 18, 2:34 PM MDT	Special Weather Statement	TFX	Blaine	11 min
Jun 18, 2:43 PM MDT	Special Weather Statement	TFX		62 min
Jun 18, 2:55 PM MDT	Special Weather Statement	TFX	Petroleum	20 min
Jun 18, 3:15 PM MDT	Severe Thunderstorm Warning	TFX	Cascade, Chouteau, Teton	45 min
Jun 18, 3:41 PM MDT	Special Weather Statement	TFX	Chouteau	34 min
Jun 18, 4:00 PM MDT	Severe Thunderstorm Warning	TFX	Cascade	45 min
Jun 18, 4:02 PM MDT	Special Weather Statement	TFX		58 min
Jun 18, 4:44 PM MDT	Severe Thunderstorm Warning	TFX	Cascade, Judith Basin	46 min
Jun 18, 5:04 PM MDT	Special Weather Statement	TFX	Blaine	41 min
Jun 18, 5:32 PM MDT	Special Weather Statement	TFX	Pondera	28 min
Jun 18, 5:45 PM MDT	Special Weather Statement	TFX	Blaine	30 min
Jun 18, 5:46 PM MDT	Special Weather Statement	TFX		44 min
Jun 18, 5:52 PM MDT	Special Weather Statement	TFX	Meagher	23 min

Nearby

Severe Thunderstorm Warnings in Montana, 2019 Every severe thunderstorm warning in 2019

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.