Alert archive / Montana / Winter Storm Warnings in 2015

Winter Storm Warning 1, NWS Billings, MT

January 4, 201510 counties in Montana

NWS Billings, MT issued this winter storm warning at Jan 4, 2015, 4:21 AM MST for 10 counties in Montana. It took effect at Jan 4, 2015, 3:58 PM MST. It was in force for 60 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jan 4, 2015, 4:21 AM MST (11:21 UTC)
In effect from: Jan 4, 2015, 3:58 PM MST
Expired: Jan 7, 2015, 3:29 AM MST
In force: 60 hr
Issued by: NWS Billings, MT

Counties Big Horn County, MT, Carbon County, MT, Golden Valley County, MT, Musselshell County, MT, Park County, MT, Rosebud County, MT, Stillwater County, MT, Sweet Grass County, MT, Treasure County, MT, Wheatland County, MT

The radar

The Billings radar (KBLX), 17 km from the middle of the area, began a volume at 11:27 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

Riverton, WY (KRIW), launched 00:00Z, 11.4 hours before the alert went out and 321 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: 780 m above ground
0-6 km bulk shear: 103 kt
0-1 km storm-relative helicity: 131 m²/s²
0-3 km storm-relative helicity: 292 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 winter storm 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 winter storm warning went out at Jan 3, 3:46 PM MST, 12 hours 35 minutes earlier.

Area forecast discussion, Jan 3, 3:46 PM MST, 12 hours 35 minutes before

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Hazardous weather outlook, Jan 3, 2:38 PM MST, 13 hours 43 minutes before

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        The site you requested is temporarily down for maintenance or an unexpected outage.
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The office that day

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

Issued	Product	Office	Counties	Lasted
Jan 4, 4:28 AM MST	Wind Advisory	BYZ	Park, Stillwater, Sweet Grass	11 hr
Jan 4, 3:12 PM MST	High Wind Warning	BYZ	Park, Stillwater, Sweet Grass	19 hr

Nearby

Winter Storm Warnings in Montana, 2015 Winter Storm Warnings in Wyoming, 2015 Every winter storm warning in 2015

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.