Alert archive / Montana / Winter Weather Advisories in 2021
Winter Weather Advisory 51, NWS Missoula, MT
NWS Missoula, MT issued this winter weather advisory at Nov 13, 2021, 1:30 PM MST for 4 counties in Montana. It took effect at Nov 13, 2021, 7:00 PM MST. It was in force for 10 hr.
The area
The counties it named.
The facts
- Issued
- Nov 13, 2021, 1:30 PM MST (20:30 UTC)
- In effect from
- Nov 13, 2021, 7:00 PM MST
- Expired
- Nov 14, 2021, 4:57 AM MST
- In force
- 10 hr
- Issued by
- NWS Missoula, MT
Counties Flathead County, MT, Lake County, MT, Lincoln County, MT, Sanders County, MT
The radar
The Missoula radar (KMSX), 122 km from the middle of the area, began a volume at 20:29 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
Spokane, WA (KOTX), launched 12:00Z, 8.5 hours before the alert went out and 135 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
- 1115 m above ground
- 0-6 km bulk shear
- 100 kt
- 0-1 km storm-relative helicity
- 13 m²/s²
- 0-3 km storm-relative helicity
- -84 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 Nov 13, 3:16 AM MST, 10 hours 14 minutes earlier.
Area forecast discussion, Nov 13, 3:16 AM MST, 10 hours 14 minutes 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 |
|---|---|---|---|---|
| Nov 13, 1:30 PM MST | Wind Advisory | MSO | Deer Lodge, Granite, Powell, Silver Bow | 29 hr |
| Nov 13, 3:04 PM MST | Lake Wind Advisory | MSO | Flathead, Lake, Sanders | 30 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.