Alert archive / Montana / Winter Storm Warnings in 2007

Winter Storm Warning 9, NWS Billings, MT

December 23, 20074 counties in Montana

NWS Billings, MT issued this winter storm warning at Dec 23, 2007, 3:18 PM MST for 4 counties in Montana. It took effect at Dec 24, 2007, 6:00 AM MST. It was in force for 22 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: Dec 23, 2007, 3:18 PM MST (22:18 UTC)
In effect from: Dec 24, 2007, 6:00 AM MST
Expired: Dec 25, 2007, 3:52 AM MST
In force: 22 hr
Issued by: NWS Billings, MT

Counties Carbon County, MT, Park County, MT, Stillwater County, MT, Sweet Grass County, MT

The radar

The Billings radar (KBLX), 93 km from the middle of the area, began a volume at 22:16 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 12:00Z, 10.3 hours before the alert went out and 295 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: 1427 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: -11 m²/s²
0-3 km storm-relative helicity: -71 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 Dec 23, 2:56 PM MST, 22 minutes earlier.

Area forecast discussion, Dec 23, 2:56 PM MST, 22 minutes before

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Hazardous weather outlook, Dec 23, 3:53 AM MST, 11 hours 25 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
Dec 22, 5:33 PM MST	Wind Advisory	BYZ	Park, Stillwater, Sweet Grass	12 hr
Dec 23, 2:54 AM MST	High Wind Warning	BYZ	Park, Stillwater, Sweet Grass	30 hr
Dec 23, 3:26 AM MST	Winter Storm Watch	BYZ	Carbon, Park, Stillwater, Sweet Grass	12 hr

Nearby

Winter Storm Warnings in Montana, 2007 Winter Storm Warnings in Wyoming, 2007 Every winter storm warning in 2007

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.