Alert archive / Montana / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 46, NWS Billings, MT

June 21, 2002Powder River County, Rosebud County, Montana

NWS Billings, MT issued this severe thunderstorm warning at Jun 21, 2002, 11:03 PM MDT for Powder River County, Rosebud 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, 2002, 11:03 PM MDT (05:03 UTC)
Expired: Jun 22, 2002, 12:00 AM MDT
In force: 57 min
Issued by: NWS Billings, MT
Area: Counties, with a storm outline in the text

Counties Powder River County, MT, Rosebud County, MT

The radar

The Billings radar (KBLX), 188 km from the middle of the area, began a volume at 05:03 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

Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 5.1 hours before the alert went out and 270 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: 1320 J/kg
Mixed-layer CIN: -25 J/kg
Mixed-layer LCL: 1902 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: -3 m²/s²
0-3 km storm-relative helicity: 116 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.1

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 Billings, MT wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 21, 8:33 PM MDT, 2 hours 30 minutes earlier.

Area forecast discussion, Jun 21, 8:33 PM MDT, 2 hours 30 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 21, 8:27 PM MDT	Severe Thunderstorm Warning	BYZ	Big Horn	63 min
Jun 21, 9:33 PM MDT	Severe Thunderstorm Warning	BYZ	Big Horn, Rosebud	57 min
Jun 21, 10:27 PM MDT	Severe Thunderstorm Warning	BYZ	Rosebud	33 min
Jun 22, 4:54 PM MDT	Severe Thunderstorm Warning	BYZ	Carter	66 min
Jun 22, 5:11 PM MDT	Severe Thunderstorm Warning	BYZ	Powder River	64 min

Nearby

Severe Thunderstorm Warnings in Montana, 2002 Every severe thunderstorm warning in 2002

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.