Alert archive / Montana / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 87, NWS Glasgow, MT

July 19, 2011Phillips County, Montana

NWS Glasgow, MT issued this severe thunderstorm warning at Jul 19, 2011, 6:15 PM MDT for Phillips County, Montana. It was in force for 60 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 19, 2011, 6:15 PM MDT (00:15 UTC)
Expired: Jul 19, 2011, 7:15 PM MDT
In force: 60 min
Issued by: NWS Glasgow, MT
Area: Storm-based polygon

County Phillips County, MT

The radar

The Glasgow radar (KGGW), 96 km from the middle of the area, began a volume at 00:15 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 nearest sounding before it

Great_falls, MT (KTFX), launched 00:00Z, 0.3 hours before the alert went out and 219 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 3681 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: -57 m²/s²
0-3 km storm-relative helicity: 12 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 19, 3:07 PM MDT, 3 hours 8 minutes earlier.

Area forecast discussion, Jul 19, 3:07 PM MDT, 3 hours 8 minutes before

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Hazardous weather outlook, Jul 19, 2:48 PM MDT, 3 hours 27 minutes before

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In the hours before

Local storm report, Jul 19, 5:54 PM MDT, 21 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 19, 6:00 PM MDT	Special Weather Statement	GGW	Phillips	60 min
Jul 19, 7:03 PM MDT	Special Weather Statement	GGW	Valley	57 min
Jul 19, 9:25 PM MDT	Severe Thunderstorm Warning	GGW	Daniels	29 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.