Alert archive / Montana / Special Weather Statements in 2012

Special Weather Statement, NWS Billings, MT

July 21, 2012Carter County, Montana

NWS Billings, MT issued this special weather statement at Jul 21, 2012, 7:59 PM MDT for Carter County, Montana. It was in force for 31 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 21, 2012, 7:59 PM MDT (01:59 UTC)
Expired: Jul 21, 2012, 8:30 PM MDT
In force: 31 min
Issued by: NWS Billings, MT

County Carter County, MT

The radar

The Rapid City radar (KUDX), 151 km from the middle of the area, began a volume at 02:01 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

Rapid City, SD (KUNR), launched 00:00Z, 2.0 hours before the alert went out and 153 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: 171 J/kg
Mixed-layer CIN: -269 J/kg
Mixed-layer LCL: 2499 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 49 m²/s²
0-3 km storm-relative helicity: 126 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Jul 21, 4:56 PM MDT, 3 hours 3 minutes earlier.

Area forecast discussion, Jul 21, 4:56 PM MDT, 3 hours 3 minutes before

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Hazardous weather outlook, Jul 21, 3:24 PM MDT, 4 hours 35 minutes before

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In the hours before

Special weather statement, Jul 21, 4:45 PM MDT, 3 hours 14 minutes before

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Special weather statement, Jul 21, 5:11 PM MDT, 2 hours 48 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
Jul 22, 3:42 AM MDT	Fire Weather Watch	BYZ	Big Horn, Carbon, Gallatin, Golden Valley, Madison, Musselshell and 5 more	24 hr

Nearby

Special Weather Statements in Montana, 2012 Every special weather statement in 2012

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.