Alert archive / Montana / Wind Chill Advisories in 2021

Wind Chill Advisory 15, NWS Glasgow, MT

December 25, 20218 counties in Montana

NWS Glasgow, MT issued this wind chill advisory at Dec 25, 2021, 1:02 PM MST for 8 counties in Montana. It took effect at Dec 25, 2021, 9:00 PM MST. It was in force for 11 hr.

The area

The counties it named.

The facts

Issued: Dec 25, 2021, 1:02 PM MST (20:02 UTC)
In effect from: Dec 25, 2021, 9:00 PM MST
Expired: Dec 26, 2021, 8:00 AM MST
In force: 11 hr
Issued by: NWS Glasgow, MT

Counties Daniels County, MT, Garfield County, MT, McCone County, MT, Phillips County, MT, Richland County, MT, Roosevelt County, MT, Sheridan County, MT, Valley County, MT

The radar

The Glasgow radar (KGGW), 56 km from the middle of the area, began a volume at 20:04 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

Bismarck Municip, ND (KBIS), launched 12:00Z, 8.0 hours before the alert went out and 418 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: 693 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 122 m²/s²
0-3 km storm-relative helicity: 123 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 wind chill advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Glasgow, MT wrote its last area forecast discussion before this wind chill advisory went out at Dec 25, 9:49 AM MST, 3 hours 13 minutes earlier.

Area forecast discussion, Dec 25, 9:49 AM MST, 3 hours 13 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 25, 1:02 PM MST	Winter Weather Advisory	GGW	Daniels, Dawson, Garfield, McCone, Petroleum, Phillips and 6 more	33 hr

Nearby

Wind Chill Advisories in Montana, 2021 Every wind chill advisory in 2021

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.