Alert archive / Montana / Wind Advisories in 2021
Wind Advisory 8, NWS Missoula, MT
NWS Missoula, MT issued this wind advisory at Sep 17, 2021, 2:16 PM MDT for 5 counties in Montana. It took effect at Sep 18, 2021, 9:00 AM MDT. It was in force for 12 hr.
The area
The counties it named.
The facts
- Issued
- Sep 17, 2021, 2:16 PM MDT (20:16 UTC)
- In effect from
- Sep 18, 2021, 9:00 AM MDT
- Expired
- Sep 18, 2021, 9:00 PM MDT
- In force
- 12 hr
- Issued by
- NWS Missoula, MT
Counties Granite County, MT, Lake County, MT, Missoula County, MT, Powell County, MT, Ravalli County, MT
The radar
The Missoula radar (KMSX), 34 km from the middle of the area, began a volume at 20:14 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, 8.3 hours before the alert went out and 227 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
- 2875 m above ground
- 0-6 km bulk shear
- 54 kt
- 0-1 km storm-relative helicity
- 178 m²/s²
- 0-3 km storm-relative helicity
- 357 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
691 WWUS75 KMSO 172016 NPWMSO URGENT - WEATHER MESSAGE National Weather Service Missoula MT 216 PM MDT Fri Sep 17 2021 MTZ007-190300- /O.NEW.KMSO.HW.W.0004.210918T1500Z-210919T0300Z/ Butte/Blackfoot Region- 216 PM MDT Fri Sep 17 2021 ...HIGH WIND WARNING IN EFFECT FROM 9 AM TO 9 PM MDT SATURDAY... * WHAT...West winds 25 to 35 mph with gusts up to 55 mph expected. * WHERE...Butte, Georgetown Lake, Highway 12 Garrison to Elliston, Homestake Pass, and MacDonald Pass. * WHEN...From 9 AM to 9 PM MDT Saturday. * 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. Fasten loose objects or shelter objects in a safe location prior to the onset of winds. Use caution if you must drive. && $$ IDZ009-010-190300- /O.NEW.KMSO.HW.W.0004.210918T1500Z-210919T0300Z/ Western Lemhi County-Eastern Lemhi County- 216 PM MDT Fri Sep 17 2021 ...HIGH WIND WARNING IN EFFECT FROM 9 AM TO 9 PM MDT SATURDAY... * WHAT...Southwest winds 25 to 35 mph with gusts up to 55 mph expected. * WHERE...Shoup, Bannock Pass, Highway 28 Tendoy to Lone Pine, Highway 93 Lost Trail Pass to Gibbonsville, Lemhi Pass, and Salmon. * WHEN...From 9 AM to 9 PM MDT Saturday. * IMPACTS...Damaging winds will blow down trees and power lines. Widespread power outages are expected. Travel will be difficult, especially for high profile vehicles. PRECAUTIONARY/PREPAREDNESS ACTIONS... People should avoid being outside in forested areas and around trees and branches. Fasten loose objects or shelter objects in a safe location prior to the onset of winds. Use caution if you must drive. && $$ MTZ006-043-190300- /O.NEW.KMSO.WI.Y.0008.210918T1500Z-210919T0300Z/ Bitterroot/Sapphire Mountains-Potomac/Seeley Lake Region- 216 PM MDT Fri Sep 17 2021 ...WIND ADVISORY IN EFFECT FROM 9 AM TO 9 PM MDT SATURDAY... * WHAT...West winds 20 to 30 mph with gusts up to 45 mph expected. * WHERE...Highway 93 Sula to Lost Trail Pass, Lolo Pass, Highway 200 Bonner to Greenough, Highway 83 Seeley Lake to Condon, and I- 90 East Missoula to Bearmouth. * WHEN...From 9 AM to 9 PM MDT Saturday. * 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. && $$ MTZ005-190300- /O.NEW.KMSO.WI.Y.0008.210918T1500Z-210919T0300Z/ Missoula/Bitterroot Valleys- 216 PM MDT Fri Sep 17 2021 ...WIND ADVISORY IN EFFECT FROM 9 AM TO 9 PM MDT SATURDAY... * WHAT...West winds 20 to 30 mph with gusts up to 45 mph expected. * WHERE...Missoula/Bitterroot Valleys. * WHEN...From 9 AM to 9 PM MDT Saturday. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ MTZ003-190300- /O.NEW.KMSO.LW.Y.0006.210918T1500Z-210919T0300Z/ Flathead/Mission Valleys- 216 PM MDT Fri Sep 17 2021 ...LAKE WIND ADVISORY IN EFFECT FROM 9 AM TO 9 PM MDT SATURDAY FOR FLATHEAD LAKE... * WHAT...Waves 1 to 3 feet due to southwest to west winds 10 to 20 mph with gusts up to 35 mph expected on Flathead Lake. * WHERE...Flathead/Mission Valleys. * WHEN...From 9 AM to 9 PM MDT Saturday. * IMPACTS...Strong winds and rough waves will create hazardous conditions for small craft. PRECAUTIONARY/PREPAREDNESS ACTIONS... Boaters on area lakes should use extra caution since strong winds and rough waves can overturn small craft. && $$
1 follow-up statement
461 WWUS75 KMSO 190239 NPWMSO URGENT - WEATHER MESSAGE National Weather Service Missoula MT 839 PM MDT Sat Sep 18 2021 MTZ007-190345- /O.EXP.KMSO.HW.W.0004.000000T0000Z-210919T0300Z/ Butte/Blackfoot Region- 839 PM MDT Sat Sep 18 2021 ...HIGH WIND WARNING WILL EXPIRE AT 9 PM MDT THIS EVENING... Gusts of 20-30 mph will continue until about midnight MDT. $$ IDZ009-010-190345- /O.EXP.KMSO.HW.W.0004.000000T0000Z-210919T0300Z/ Western Lemhi County-Eastern Lemhi County- 839 PM MDT Sat Sep 18 2021 ...HIGH WIND WARNING WILL EXPIRE AT 9 PM MDT THIS EVENING... Gusts of 20-30 mph will continue until about midnight MDT. $$ MTZ006-043-190345- /O.EXP.KMSO.WI.Y.0008.000000T0000Z-210919T0300Z/ Bitterroot/Sapphire Mountains-Potomac/Seeley Lake Region- 839 PM MDT Sat Sep 18 2021 ...WIND ADVISORY WILL EXPIRE AT 9 PM MDT THIS EVENING... $$ MTZ005-190345- /O.EXP.KMSO.WI.Y.0008.000000T0000Z-210919T0300Z/ Missoula/Bitterroot Valleys- 839 PM MDT Sat Sep 18 2021 ...WIND ADVISORY WILL EXPIRE AT 9 PM MDT THIS EVENING... $$ MTZ003-190345- /O.EXP.KMSO.LW.Y.0006.000000T0000Z-210919T0300Z/ Flathead/Mission Valleys- 839 PM MDT Sat Sep 18 2021 ...LAKE WIND ADVISORY WILL EXPIRE AT 9 PM MDT THIS EVENING FOR FLATHEAD LAKE... $$
The office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 16, 7:41 PM MDT | Frost Advisory | MSO | Flathead, Lake, Missoula, Ravalli, Sanders | 13 hr |
| Sep 17, 2:16 PM MDT | High Wind Warning | MSO | Deer Lodge, Granite, Powell, Silver Bow | 31 hr |
| Sep 17, 2:16 PM MDT | Lake Wind Advisory | MSO | Flathead, Lake, Sanders | 31 hr |
Nearby
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.