Alert archive / Montana / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 71, NWS Glasgow, MT

July 14, 2011Daniels County, Roosevelt County, Sheridan County, Montana

NWS Glasgow, MT issued this severe thunderstorm warning at Jul 14, 2011, 9:44 PM MDT for Daniels County, Roosevelt County, Sheridan County, Montana. It was in force for 61 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 14, 2011, 9:44 PM MDT (03:44 UTC)
Expired: Jul 14, 2011, 10:45 PM MDT
In force: 61 min
Issued by: NWS Glasgow, MT
Area: Storm-based polygon

Counties Daniels County, MT, Roosevelt County, MT, Sheridan County, MT

The radar

The Glasgow radar (KGGW), 126 km from the middle of the area, began a volume at 03:47 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
Jul 14, 1:56 PM MDT	Severe Thunderstorm Watch	SPC	9 hr

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 3.7 hours before the alert went out and 124 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: 272 J/kg
Mixed-layer CIN: -124 J/kg
Mixed-layer LCL: 2109 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: -22 m²/s²
0-3 km storm-relative helicity: 106 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.9

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 14, 9:20 PM MDT, 24 minutes earlier.

Area forecast discussion, Jul 14, 9:20 PM MDT, 24 minutes before

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Hazardous weather outlook, Jul 14, 9:08 PM MDT, 36 minutes before

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In the hours before

Local storm report, Jul 14, 7:30 PM MDT, 2 hours 14 minutes before

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Local storm report, Jul 14, 8:08 PM MDT, 1 hour 36 minutes before

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Local storm report, Jul 14, 8:16 PM MDT, 1 hour 28 minutes before

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Local storm report, Jul 14, 8:33 PM MDT, 1 hour 11 minutes before

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Local storm report, Jul 14, 9:10 PM MDT, 34 minutes before

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Local storm report, Jul 14, 9:25 PM MDT, 19 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
Jul 14, 6:26 PM MDT	Severe Thunderstorm Warning	GGW	Phillips, Valley	64 min
Jul 14, 6:43 PM MDT	Severe Thunderstorm Warning	GGW	Garfield	62 min
Jul 14, 7:14 PM MDT	Severe Thunderstorm Warning	GGW	Valley	61 min
Jul 14, 7:19 PM MDT	Flash Flood Warning	GGW	Garfield	3 hr
Jul 14, 7:58 PM MDT	Severe Thunderstorm Warning	GGW	Garfield, McCone, Prairie	62 min
Jul 14, 8:42 PM MDT	Severe Thunderstorm Warning	GGW	Dawson, McCone	63 min
Jul 14, 8:44 PM MDT	Severe Thunderstorm Warning	GGW	Roosevelt, Valley	61 min
Jul 14, 9:33 PM MDT	Severe Thunderstorm Warning	GGW	Dawson, Prairie, Wibaux	57 min
Jul 14, 10:29 PM MDT	Severe Thunderstorm Warning	GGW	Dawson, Wibaux	46 min
Jul 15, 5:51 PM MDT	Severe Thunderstorm Warning	GGW	Petroleum	54 min

Nearby

Severe Thunderstorm Warnings in Montana, 2011 Every severe thunderstorm warning in 2011

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.