Alert archive / Montana / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 59, NWS Glasgow, MT

June 28, 20184 counties in Montana

NWS Glasgow, MT issued this severe thunderstorm warning at Jun 28, 2018, 6:31 PM MDT for 4 counties in Montana. It was in force for 59 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 28, 2018, 6:31 PM MDT (00:31 UTC)
Expired: Jun 28, 2018, 7:30 PM MDT
In force: 59 min
Issued by: NWS Glasgow, MT
Area: Storm-based polygon
Tornado: Possible
Hail: 1.5 in
Wind: 70.0 mph

Counties Dawson County, MT, Garfield County, MT, McCone County, MT, Prairie County, MT

The radar

The Glasgow radar (KGGW), 123 km from the middle of the area, began a volume at 00:31 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
Jun 28, 3:42 PM MDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 00:00Z, 0.5 hours before the alert went out and 388 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: 2612 J/kg
Mixed-layer CIN: -51 J/kg
Mixed-layer LCL: 1800 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 84 m²/s²
0-3 km storm-relative helicity: 172 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 11.7

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 Glasgow, MT wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 28, 2:13 PM MDT, 4 hours 18 minutes earlier.

Area forecast discussion, Jun 28, 2:13 PM MDT, 4 hours 18 minutes before

Area Forecast Discussion
National Weather Service Glasgow MT
213 PM MDT Thu Jun 28 2018

.DISCUSSION...
...Strong to severe storms with heavy rain expected this evening
for portions of northeast Montana...

Theta-e ridge remains in place across eastern Montana this
afternoon with a surface low over north-central Wyoming allowing a
southeast surface flow to bring in some very moist air into the
region. Dewpoints in the lower 70s have reached Baker and mid 60s
just southeast of Fort Peck Lake. Precipital waters have exceeded
1.0" in the eastern zones with the potential to reach 2.0" near
Sidney this evening.

HRRR and other near-term models showing activity to really ramp
up at about 00z (6 pm) over mainly the eastern CWA. Supercells
will bring the threat of mainly damaging hail and winds. The QPF
continues to increase this evening, so a Flash Flood Watch has
been issued the southeast zones, mainly concerned about Sidney,
Glendive and points east from 6 pm-3 am. Rainfall amounts to 2.0"
not out of the question in this area.

Most of the activity moves into North Dakota around midnight. The
responsible upper trough will remain just west of the CWA Friday,
so more showers/thunderstorms are expected to linger. Some strong
storms near the ND border.

The trough drifts through eastern Montana Saturday but more energy
behind the trough keeps things unsettled through the weekend.
Troughiness will redevelop over western Canada/Pacific Northwest
by middle of next week, with another threat of
showers/thunderstorms. TFJ

&&

.AVIATION...
VFR conditions will prevail. However, brief MVFR ceilings and
visibilities are possible with some of the steadier shower and
thunderstorm activity that occurs this evening as a low pressure
system and cold front pushes through the region. A few of these
storms may be severe with large hail, damaging winds, and heavy
rain.

In general, winds will be east to northeast at 10 to 15 kts
this evening, becoming northwest late tonight. Note that with any
thunderstorms, winds could be gusty and erratic. Maliawco/TFJ

&&

.GLASGOW WATCHES/WARNINGS/ADVISORIES...
Flash Flood Watch from 6 PM MDT this evening through late
tonight for Dawson...Eastern Roosevelt...Prairie...Richland...
Wibaux.

&&

weather.gov/glasgow

In the hours before

Local storm report, Jun 28, 5:03 PM MDT, 1 hour 28 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>

Special weather statement, Jun 28, 5:38 PM MDT, 53 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>

Special weather statement, Jun 28, 5:52 PM MDT, 39 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>

Local storm report, Jun 28, 6:05 PM MDT, 26 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>

Local storm report, Jun 28, 6:21 PM MDT, 10 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>

Local storm report, Jun 28, 6:30 PM MDT, 1 minute 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 Glasgow, MT issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 28, 6:09 PM MDT	Severe Thunderstorm Warning	GGW	Garfield, McCone, Roosevelt, Valley	66 min
Jun 28, 6:54 PM MDT	Severe Thunderstorm Warning	GGW	Dawson, Richland	66 min
Jun 28, 7:01 PM MDT	Special Weather Statement	GGW	Roosevelt	59 min
Jun 28, 7:05 PM MDT	Severe Thunderstorm Warning	GGW	Dawson, McCone, Richland, Roosevelt	55 min
Jun 28, 7:33 PM MDT	Severe Thunderstorm Warning	GGW	Dawson, Prairie	57 min
Jun 28, 7:42 PM MDT	Severe Thunderstorm Warning	GGW	Richland, Roosevelt	48 min
Jun 28, 7:44 PM MDT	Severe Thunderstorm Warning	GGW	Dawson, Richland, Wibaux	61 min
Jun 28, 7:56 PM MDT	Areal Flood Advisory	GGW	Richland, Roosevelt, Sheridan	2 hr

Nearby

Severe Thunderstorm Warnings in Montana, 2018 Every severe thunderstorm warning in 2018

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.