Alert archive / Montana / Winter Storm Warnings in 2020
Winter Storm Warning 3, NWS Glasgow, MT
NWS Glasgow, MT issued this winter storm warning at Oct 21, 2020, 10:27 AM MDT for 5 counties in Montana. It took effect at Oct 21, 2020, 12:00 PM MDT. It was in force for 21 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
- Oct 21, 2020, 10:27 AM MDT (16:27 UTC)
- In effect from
- Oct 21, 2020, 12:00 PM MDT
- Expired
- Oct 22, 2020, 8:56 AM MDT
- In force
- 21 hr
- Issued by
- NWS Glasgow, MT
Counties Daniels County, MT, McCone County, MT, Phillips County, MT, Roosevelt County, MT, Valley County, MT
The radar
The Glasgow radar (KGGW), 33 km from the middle of the area, began a volume at 16:29 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, 4.5 hours before the alert went out and 444 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
- 1098 m above ground
- 0-6 km bulk shear
- 66 kt
- 0-1 km storm-relative helicity
- 14 m²/s²
- 0-3 km storm-relative helicity
- 23 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
Nearby
Winter Storm Warnings in Montana, 2020Every winter storm 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.