Alert archive / Montana / High Wind Watches in 2021
High Wind Watch 3, NWS Missoula, MT
NWS Missoula, MT issued this high wind watch at Feb 20, 2021, 2:56 PM MST for 4 counties in Montana. It took effect at Feb 21, 2021, 5:00 PM MST. It was in force for .
The area
The counties it named.
The facts
- Issued
- Feb 20, 2021, 2:56 PM MST (21:56 UTC)
- In effect from
- Feb 21, 2021, 5:00 PM MST
- Expired
- Feb 21, 2021, 10:42 AM MST
- In force
- 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 21:58 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, 9.9 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
- 798 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 82 m²/s²
- 0-3 km storm-relative helicity
- 108 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
428 WWUS75 KMSO 202156 NPWMSO URGENT - WEATHER MESSAGE National Weather Service Missoula MT 256 PM MST Sat Feb 20 2021 MTZ001-002-212200- /O.NEW.KMSO.HW.A.0003.210222T0000Z-210222T1800Z/ Kootenai/Cabinet Region-West Glacier Region- 256 PM MST Sat Feb 20 2021 ...HIGH WIND WATCH IN EFFECT FROM SUNDAY AFTERNOON THROUGH MONDAY MORNING... * WHAT...Southwest winds 30 to 40 mph with gusts up to 60 mph possible. * WHERE...Highway 2 Kalispell to Libby, Highway 37 Eureka to Libby, Highway 56 Bull Lake Road, Highway 93 Eureka to Whitefish, Bad Rock Canyon, Essex, Highway 83 Bigfork to Swan Lake, Marias Pass, and Polebridge. * WHEN...From Sunday afternoon through Monday morning. * IMPACTS...Damaging winds could blow down trees and power lines. Widespread power outages are possible. Travel could be difficult, especially for high profile vehicles. Periods of heavy snow are possible near Marias Pass and combined with the high wind will create blowing snow and reduced visibility. PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the latest forecasts and warnings for updates on this situation. Fasten loose objects or shelter objects in a safe location prior to the onset of winds. && $$
1 follow-up statement
855 WWUS75 KMSO 211742 NPWMSO URGENT - WEATHER MESSAGE National Weather Service Missoula MT 1042 AM MST Sun Feb 21 2021 MTZ002-211845- /O.CAN.KMSO.HW.A.0003.210222T0000Z-210222T1800Z/ West Glacier Region- 1042 AM MST Sun Feb 21 2021 ...HIGH WIND WATCH IS CANCELLED... $$ MTZ001-221745- /O.UPG.KMSO.HW.A.0003.210222T0000Z-210222T1800Z/ /O.NEW.KMSO.HW.W.0002.210221T2200Z-210222T1800Z/ Kootenai/Cabinet Region- 1042 AM MST Sun Feb 21 2021 ...HIGH WIND WARNING IN EFFECT FROM 3 PM THIS AFTERNOON TO 11 AM MST MONDAY... * WHAT...Southwest winds 25 to 35 mph with gusts up to 55 mph expected. * WHERE...Highway 2 Kalispell to Libby, Highway 37 Eureka to Libby, Highway 56 Bull Lake Road, and Highway 93 Eureka to Whitefish. * WHEN...From 3 PM this afternoon to 11 AM MST Monday. * IMPACTS...Damaging winds will blow down trees and power lines. Widespread power outages are expected. Travel will be difficult, especially for high profile vehicles. PRECAUTIONARY/PREPAREDNESS ACTIONS... People should avoid being outside in forested areas and around trees and branches. If possible, remain in the lower levels of your home during the windstorm, and avoid windows. Use caution if you must drive. && $$ MTZ003-221745- /O.NEW.KMSO.WI.Y.0003.210221T2200Z-210222T1800Z/ Flathead/Mission Valleys- 1042 AM MST Sun Feb 21 2021 ...WIND ADVISORY IN EFFECT FROM 3 PM THIS AFTERNOON TO 11 AM MST MONDAY... * WHAT...South winds 15 to 30 mph with gusts up to 40 mph expected. * WHERE...Flathead Lake, Flathead Valley, Mission Valley, and Polson. * WHEN...From 3 PM this afternoon to 11 AM MST Monday. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$
The office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 20, 4:51 PM MST | Special Weather Statement | MSO | Powell | 39 min |
Nearby
High Wind Watches in Montana, 2021Every high wind watch 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.