Alert archive / Montana / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 63, NWS Glasgow, MT

July 23, 2020Daniels County, Roosevelt County, Montana

NWS Glasgow, MT issued this severe thunderstorm warning at Jul 23, 2020, 8:40 PM MDT for Daniels County, Roosevelt County, Montana. It was in force for 15 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: Jul 23, 2020, 8:40 PM MDT (02:40 UTC)
Expired: Jul 23, 2020, 8:55 PM MDT
In force: 15 min
Issued by: NWS Glasgow, MT
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Daniels County, MT, Roosevelt County, MT

The radar

The Glasgow radar (KGGW), 106 km from the middle of the area, began a volume at 02:39 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
Jul 23, 2:27 PM MDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 2.7 hours before the alert went out and 104 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: 2203 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 4 m²/s²
0-3 km storm-relative helicity: 390 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.2

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.

In the hours before

Local storm report, Jul 23, 7:42 PM MDT, 58 minutes before

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Special weather statement, Jul 23, 7:49 PM MDT, 51 minutes before

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Special weather statement, Jul 23, 8:16 PM MDT, 24 minutes before

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Local storm report, Jul 23, 8:32 PM MDT, 8 minutes before

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      <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.
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Local storm report, Jul 23, 8:35 PM MDT, 5 minutes before

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<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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Local storm report, Jul 23, 8:39 PM MDT, 1 minute before

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<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>
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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 23, 6:06 PM MDT	Special Weather Statement	GGW	Dawson	54 min
Jul 23, 6:17 PM MDT	Special Weather Statement	GGW	Richland, Roosevelt	43 min
Jul 23, 6:26 PM MDT	Special Weather Statement	GGW	Daniels	49 min
Jul 23, 6:34 PM MDT	Special Weather Statement	GGW	Wibaux	56 min
Jul 23, 6:41 PM MDT	Special Weather Statement	GGW	Sheridan	49 min
Jul 23, 7:03 PM MDT	Special Weather Statement	GGW	Sheridan	57 min
Jul 23, 7:08 PM MDT	Severe Thunderstorm Warning	GGW	Sheridan	35 min
Jul 23, 7:39 PM MDT	Severe Thunderstorm Warning	GGW	Sheridan	34 min
Jul 23, 7:49 PM MDT	Special Weather Statement	GGW	Daniels	41 min
Jul 23, 8:16 PM MDT	Special Weather Statement	GGW	Daniels	44 min

Nearby

Severe Thunderstorm Warnings in Montana, 2020 Every severe thunderstorm warning in 2020

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.