Alert archive / Montana / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 32, NWS Glasgow, MT

July 4, 2020Daniels County, Montana

NWS Glasgow, MT issued this severe thunderstorm warning at Jul 4, 2020, 8:23 PM MDT for Daniels County, Montana. It was in force for 67 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 4, 2020, 8:23 PM MDT (02:23 UTC)
Expired
Jul 4, 2020, 9:30 PM MDT
In force
67 min
Issued by
NWS Glasgow, MT
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

County Daniels County, MT

The radar

The Glasgow radar (KGGW), 102 km from the middle of the area, began a volume at 02:27 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.

IssuedProductOfficeLasted
Jul 4, 5:39 PM MDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Great_falls, MT (KTFX), launched 00:00Z, 2.4 hours before the alert went out and 403 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, Great_falls, MT at 00:00Z on 2020-07-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 6 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Great_falls, MT at 00:00Z on 2020-07-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 169 square meters per square second.19395878Sfc1 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
6 J/kg
Mixed-layer CIN
-162 J/kg
Mixed-layer LCL
2545 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
169 m²/s²
0-3 km storm-relative helicity
245 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 Glasgow, MT wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 4, 8:16 PM MDT, 7 minutes earlier.

Area forecast discussion, Jul 4, 8:16 PM MDT, 7 minutes before
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In the hours before

Special weather statement, Jul 4, 6:39 PM MDT, 1 hour 44 minutes before
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Special weather statement, Jul 4, 7:04 PM MDT, 1 hour 19 minutes before
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Special weather statement, Jul 4, 7:28 PM MDT, 55 minutes before
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Special weather statement, Jul 4, 7:49 PM MDT, 34 minutes before
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Special weather statement, Jul 4, 8:06 PM MDT, 17 minutes before
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      <h1 id="headline">This service is currently unavailable.</h1>
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      <p id="message2">
        Please try again in a few minutes.
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Local storm report, Jul 4, 8:13 PM MDT, 10 minutes before
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<body>
  <main class="wrap">
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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.
      </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>
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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 4, 6:39 PM MDTSpecial Weather StatementGGWPhillips66 min
Jul 4, 7:04 PM MDTSpecial Weather StatementGGWPrairie56 min
Jul 4, 7:23 PM MDTSevere Thunderstorm WarningGGWGarfield, Petroleum, Phillips53 min
Jul 4, 7:28 PM MDTSpecial Weather StatementGGWPrairie62 min
Jul 4, 7:49 PM MDTSpecial Weather StatementGGWMcCone56 min
Jul 4, 7:58 PM MDTSevere Thunderstorm WarningGGWGarfield, Phillips, Valley62 min
Jul 4, 8:06 PM MDTSpecial Weather StatementGGWPhillips54 min
Jul 4, 8:08 PM MDTSevere Thunderstorm WarningGGWGarfield, McCone52 min
Jul 4, 8:30 PM MDTSpecial Weather StatementGGWDawson, Prairie, Wibaux45 min
Jul 4, 8:31 PM MDTSevere Thunderstorm WarningGGWMcCone, Valley37 min
Jul 4, 8:41 PM MDTSpecial Weather StatementGGWValley64 min
Jul 4, 8:48 PM MDTSpecial Weather StatementGGWMcCone57 min
Jul 4, 8:52 PM MDTSevere Thunderstorm WarningGGWGarfield, McCone, Valley53 min
Jul 4, 9:07 PM MDTSpecial Weather StatementGGWMcCone53 min
Jul 4, 9:12 PM MDTSevere Thunderstorm WarningGGWValley36 min
Jul 4, 9:24 PM MDTSpecial Weather StatementGGWDaniels66 min
Jul 4, 9:33 PM MDTSevere Thunderstorm WarningGGWDaniels, McCone, Roosevelt, Valley57 min
Jul 4, 9:47 PM MDTAreal Flood AdvisoryGGWDaniels, Sheridan3 hr
Jul 4, 9:52 PM MDTAreal Flood AdvisoryGGWGarfield, McCone, Roosevelt, Valley2 hr
Jul 4, 9:56 PM MDTAreal Flood AdvisoryGGWGarfield, McCone3 hr
Jul 4, 10:07 PM MDTSpecial Weather StatementGGWDawson, Prairie, Richland, Roosevelt68 min
Jul 4, 10:45 PM MDTSevere Thunderstorm WarningGGWRichland, Roosevelt, Sheridan48 min
Jul 4, 11:15 PM MDTSpecial Weather StatementGGWDawson, Richland, Wibaux75 min
Jul 5, 3:46 PM MDTSpecial Weather StatementGGWRichland44 min
Jul 5, 4:09 PM MDTSevere Thunderstorm WarningGGWRoosevelt35 min

Nearby

Severe Thunderstorm Warnings in Montana, 2020Every 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.