Alert archive / Montana / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 29, NWS Glasgow, MT

May 26, 20185 counties in Montana

NWS Glasgow, MT issued this severe thunderstorm warning at May 26, 2018, 11:02 PM MDT for 5 counties in Montana. It was in force for 58 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: May 26, 2018, 11:02 PM MDT (05:02 UTC)
Expired: May 27, 2018, 12:00 AM MDT
In force: 58 min
Issued by: NWS Glasgow, MT
Area: Storm-based polygon
Hail: 0.75 in
Wind: 70.0 mph

Counties Dawson County, MT, McCone County, MT, Prairie County, MT, Richland County, MT, Wibaux County, MT

The radar

The Glasgow radar (KGGW), 159 km from the middle of the area, began a volume at 05:06 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
May 26, 5:36 PM MDT	Severe Thunderstorm Watch	SPC	9 hr

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 5.0 hours before the alert went out and 158 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: 1409 J/kg
Mixed-layer CIN: -48 J/kg
Mixed-layer LCL: 2385 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 31 m²/s²
0-3 km storm-relative helicity: 114 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.0

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 May 26, 10:26 PM MDT, 36 minutes earlier.

Area forecast discussion, May 26, 10:26 PM MDT, 36 minutes before

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In the hours before

Special weather statement, May 26, 10:34 PM MDT, 28 minutes before

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Local storm report, May 26, 10:40 PM MDT, 22 minutes before

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Special weather statement, May 26, 10:44 PM MDT, 18 minutes before

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Local storm report, May 26, 10:46 PM MDT, 16 minutes before

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Local storm report, May 26, 10:50 PM MDT, 12 minutes before

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Local storm report, May 26, 10:52 PM MDT, 10 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
May 26, 6:34 PM MDT	Special Weather Statement	GGW		41 min
May 26, 6:36 PM MDT	Special Weather Statement	GGW	McCone	39 min
May 26, 6:46 PM MDT	Severe Thunderstorm Warning	GGW	Garfield, McCone	59 min
May 26, 6:52 PM MDT	Severe Thunderstorm Warning	GGW	Garfield, McCone, Valley	53 min
May 26, 7:42 PM MDT	Severe Thunderstorm Warning	GGW	Garfield, McCone, Valley	63 min
May 26, 7:45 PM MDT	Special Weather Statement	GGW	McCone	60 min
May 26, 8:18 PM MDT	Special Weather Statement	GGW	McCone	42 min
May 26, 8:38 PM MDT	Severe Thunderstorm Warning	GGW	Dawson, McCone, Richland	67 min
May 26, 8:53 PM MDT	Special Weather Statement	GGW	McCone	67 min
May 26, 9:14 PM MDT	Severe Thunderstorm Warning	GGW	Dawson, Richland	61 min
May 26, 9:23 PM MDT	Special Weather Statement	GGW	Garfield	52 min
May 26, 9:29 PM MDT	Special Weather Statement	GGW	Sheridan	46 min
May 26, 9:33 PM MDT	Special Weather Statement	GGW	Valley	57 min
May 26, 9:44 PM MDT	Severe Thunderstorm Warning	GGW	Dawson, McCone	61 min
May 26, 9:49 PM MDT	Flash Flood Warning	GGW	Garfield, McCone	4 hr
May 26, 10:15 PM MDT	Special Weather Statement	GGW	McCone	45 min
May 26, 10:21 PM MDT	Flash Flood Warning	GGW	Dawson, McCone, Richland	4 hr
May 26, 10:34 PM MDT	Special Weather Statement	GGW	Richland	56 min
May 26, 10:44 PM MDT	Special Weather Statement	GGW	Dawson	61 min
May 26, 11:54 PM MDT	Special Weather Statement	GGW	Wibaux	66 min
May 27, 12:43 AM MDT	Areal Flood Advisory	GGW	Dawson, Prairie	3 hr
May 27, 1:06 AM MDT	Special Weather Statement	GGW	Wibaux	54 min

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.