Alert archive / Montana / Winter Weather Advisories in 2021
Winter Weather Advisory 24, NWS Missoula, MT
NWS Missoula, MT issued this winter weather advisory at Feb 23, 2021, 5:41 PM MST for Granite County, Missoula County, Ravalli County, Montana. It was in force for 14 hr.
The area
The counties it named.
The facts
- Issued
- Feb 23, 2021, 5:41 PM MST (00:41 UTC)
- Expired
- Feb 24, 2021, 7:35 AM MST
- In force
- 14 hr
- Issued by
- NWS Missoula, MT
Counties Granite County, MT, Missoula County, MT, Ravalli County, MT
The radar
The Missoula radar (KMSX), 61 km from the middle of the area, began a volume at 00:42 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
Spokane, WA (KOTX), launched 00:00Z, 0.7 hours before the alert went out and 235 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
- 68 J/kg
- Mixed-layer CIN
- -24 J/kg
- Mixed-layer LCL
- 1274 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 79 m²/s²
- 0-3 km storm-relative helicity
- 49 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this winter weather advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Missoula, MT wrote its last area forecast discussion before this winter weather advisory went out at Feb 23, 2:40 PM MST, 3 hours 1 minute earlier.
Area forecast discussion, Feb 23, 2:40 PM MST, 3 hours 1 minute before
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</html>The office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 24, 11:07 AM MST | Winter Weather Advisory | MSO | Deer Lodge, Flathead, Granite, Lake, Lincoln, Mineral and 5 more | 72 hr |
| Feb 24, 11:07 AM MST | Winter Storm Watch | MSO | Clearwater, Idaho | 17 hr |
Nearby
Winter Weather Advisories in Montana, 2021Every winter weather 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.