Alert archive / Montana / Blizzard Warnings in 2020
Blizzard Warning 1, NWS Billings, MT
NWS Billings, MT issued this blizzard warning at Nov 7, 2020, 3:51 AM MST for Golden Valley County, Wheatland County, Montana. It took effect at Nov 7, 2020, 11:00 PM MST. It was in force for 20 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
- Nov 7, 2020, 3:51 AM MST (10:51 UTC)
- In effect from
- Nov 7, 2020, 11:00 PM MST
- Expired
- Nov 8, 2020, 6:55 PM MST
- In force
- 20 hr
- Issued by
- NWS Billings, MT
Counties Golden Valley County, MT, Wheatland County, MT
The radar
The Billings radar (KBLX), 94 km from the middle of the area, began a volume at 10:51 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
Great_falls, MT (KTFX), launched 00:00Z, 10.9 hours before the alert went out and 142 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 646 m above ground
- 0-6 km bulk shear
- 56 kt
- 0-1 km storm-relative helicity
- 172 m²/s²
- 0-3 km storm-relative helicity
- 459 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this blizzard 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 blizzard warning went out at Nov 6, 8:20 PM MST, 7 hours 31 minutes earlier.
Area forecast discussion, Nov 6, 8:20 PM MST, 7 hours 31 minutes before
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</html>The office that day
Everything else NWS Billings, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 7, 3:51 AM MST | Winter Storm Warning | BYZ | Carbon, Golden Valley, Musselshell, Park, Rosebud, Stillwater and 4 more | 37 hr |
| Nov 7, 3:51 AM MST | Winter Weather Advisory | BYZ | Big Horn, Carbon, Custer | 37 hr |
| Nov 7, 4:01 AM MST | Special Weather Statement | BYZ | Carter, Fallon | 4 hr |
| Nov 7, 8:15 AM MST | Special Weather Statement | BYZ | Custer, Fallon, Rosebud | 2 hr |
Nearby
Blizzard Warnings in Montana, 2020Every blizzard warning in 2020
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.