Alert archive / Montana / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 63, NWS Glasgow, MT

June 28, 2018Richland County, Roosevelt County, Montana

NWS Glasgow, MT issued this severe thunderstorm warning at Jun 28, 2018, 7:42 PM MDT for Richland County, Roosevelt County, Montana. It was in force for 48 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, 7:42 PM MDT (01:42 UTC)
Expired: Jun 28, 2018, 8:30 PM MDT
In force: 48 min
Issued by: NWS Glasgow, MT
Area: Storm-based polygon
Hail: 0.88 in
Wind: 70.0 mph

Counties Richland County, MT, Roosevelt County, MT

The radar

The Glasgow radar (KGGW), 138 km from the middle of the area, began a volume at 01:47 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, 1.7 hours before the alert went out and 339 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, 7:14 PM MDT, 28 minutes earlier.

Area forecast discussion, Jun 28, 7:14 PM MDT, 28 minutes before

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In the hours before

Local storm report, Jun 28, 6:21 PM MDT, 1 hour 21 minutes before

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Local storm report, Jun 28, 6:30 PM MDT, 1 hour 12 minutes before

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Special weather statement, Jun 28, 7:01 PM MDT, 41 minutes before

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Local storm report, Jun 28, 7:07 PM MDT, 35 minutes before

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Local storm report, Jun 28, 7:12 PM MDT, 30 minutes before

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Local storm report, Jun 28, 7:34 PM MDT, 8 minutes before

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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, 6:31 PM MDT	Severe Thunderstorm Warning	GGW	Dawson, Garfield, McCone, Prairie	59 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, 7:44 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.