Alert archive / Montana / Severe Thunderstorm Warnings in 2005

Severe Thunderstorm Warning 31, NWS Great Falls, MT

June 21, 2005Glacier County, Pondera County, Montana

NWS Great Falls, MT issued this severe thunderstorm warning at Jun 21, 2005, 7:24 PM MDT for Glacier County, Pondera County, Montana. It was in force for 57 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 21, 2005, 7:24 PM MDT (01:24 UTC)
Expired: Jun 21, 2005, 8:21 PM MDT
In force: 57 min
Issued by: NWS Great Falls, MT
Area: Counties, with a storm outline in the text

Counties Glacier County, MT, Pondera County, MT

The radar

The Great Falls radar (KTFX), 144 km from the middle of the area, began a volume at 01:26 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 21, 2:25 PM MDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Great_falls, MT (KTFX), launched 00:00Z, 1.4 hours before the alert went out and 187 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: 693 J/kg
Mixed-layer CIN: -101 J/kg
Mixed-layer LCL: 3085 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 167 m²/s²
0-3 km storm-relative helicity: 182 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.1

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 Great Falls, MT wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 21, 2:30 PM MDT, 4 hours 54 minutes earlier.

Area forecast discussion, Jun 21, 2:30 PM MDT, 4 hours 54 minutes before

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Hazardous weather outlook, Jun 21, 5:16 AM MDT, 14 hours 8 minutes before

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In the hours before

Special weather statement, Jun 21, 2:47 PM MDT, 4 hours 37 minutes before

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Special weather statement, Jun 21, 2:47 PM MDT, 4 hours 37 minutes before

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Special weather statement, Jun 21, 7:15 PM MDT, 9 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 22, 3:43 PM MDT	Severe Thunderstorm Warning	TFX	Lewis and Clark, Meagher	47 min
Jun 22, 4:17 PM MDT	Severe Thunderstorm Warning	TFX	Cascade	58 min
Jun 22, 4:28 PM MDT	Tornado Warning	TFX	Cascade, Meagher	32 min
Jun 22, 5:16 PM MDT	Severe Thunderstorm Warning	TFX	Cascade, Chouteau, Judith Basin	59 min

Nearby

Severe Thunderstorm Warnings in Montana, 2005 Every severe thunderstorm warning in 2005

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.