Alert archive / Montana / Wind Advisories in 2021
Wind Advisory 1, NWS Missoula, MT
NWS Missoula, MT issued this wind advisory at Jan 2, 2021, 1:37 PM MST for 10 counties in Montana. It took effect at Jan 3, 2021, 2:00 AM MST. It was in force for 15 hr.
The area
The counties it named.
The facts
- Issued
- Jan 2, 2021, 1:37 PM MST (20:37 UTC)
- In effect from
- Jan 3, 2021, 2:00 AM MST
- Expired
- Jan 3, 2021, 5:00 PM MST
- In force
- 15 hr
- Issued by
- NWS Missoula, MT
Counties Deer Lodge County, MT, Flathead County, MT, Granite County, MT, Lake County, MT, Lincoln County, MT, Missoula County, MT, Powell County, MT, Ravalli County, MT, Sanders County, MT, Silver Bow County, MT
The radar
The Missoula radar (KMSX), 8 km from the middle of the area, began a volume at 20:35 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, 8.6 hours before the alert went out and 203 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
- 658 m above ground
- 0-6 km bulk shear
- 56 kt
- 0-1 km storm-relative helicity
- 120 m²/s²
- 0-3 km storm-relative helicity
- 147 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
158 WWUS75 KMSO 022037 NPWMSO URGENT - WEATHER MESSAGE National Weather Service Missoula MT 137 PM MST Sat Jan 2 2021 MTZ002-022145- /O.CAN.KMSO.HW.A.0001.210103T0900Z-210104T0000Z/ West Glacier Region- 137 PM MST Sat Jan 2 2021 ...HIGH WIND WATCH IS CANCELLED... A winter weather advisory has been issued. $$ MTZ001-003-032045- /O.UPG.KMSO.HW.A.0001.210103T0900Z-210104T0000Z/ /O.NEW.KMSO.WI.Y.0001.210103T0900Z-210104T0000Z/ Kootenai/Cabinet Region-Flathead/Mission Valleys- 137 PM MST Sat Jan 2 2021 ...WIND ADVISORY IN EFFECT FROM 2 AM TO 5 PM MST SUNDAY... * WHAT...Southwest winds 20 to 30 mph with gusts up to 40 mph expected. The strongest winds will occur during the cold front passage between 5 am to 8 am MST. * WHERE...Highway 2 Kalispell to Libby, Highway 37 Eureka to Libby, Highway 56 Bull Lake Road, Highway 93 Eureka to Whitefish, Flathead Lake, Flathead Valley, Mission Valley, and Polson. * WHEN...From 2 AM to 5 PM MST Sunday. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ MTZ005-032045- /O.NEW.KMSO.WI.Y.0001.210103T1500Z-210104T0000Z/ Missoula/Bitterroot Valleys- 137 PM MST Sat Jan 2 2021 ...WIND ADVISORY IN EFFECT FROM 8 AM TO 5 PM MST SUNDAY... * WHAT...Southwest winds 15 to 25 mph with gusts up to 40 mph expected. The strongest winds will occur during the cold front passage between 8 am to 11 am MST. * WHERE...Missoula/Bitterroot Valleys. * WHEN...From 8 AM to 5 PM MST Sunday. * 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. && $$ MTZ043-032045- /O.NEW.KMSO.WI.Y.0001.210103T1500Z-210104T0000Z/ Potomac/Seeley Lake Region- 137 PM MST Sat Jan 2 2021 ...WIND ADVISORY IN EFFECT FROM 8 AM TO 5 PM MST SUNDAY... * WHAT...Southwest winds 25 to 35 mph with gusts up to 50 mph expected. The strongest winds will occur during the cold front passage between 9 am to 12 pm MST. Mixed showers may cause slick conditions Sunday morning. * WHERE...Highway 200 Bonner to Greenough and I-90 East Missoula to Bearmouth. * WHEN...From 8 AM to 5 PM MST Sunday. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ MTZ007-032045- /O.NEW.KMSO.WI.Y.0001.210103T1500Z-210104T0000Z/ Butte/Blackfoot Region- 137 PM MST Sat Jan 2 2021 ...WIND ADVISORY IN EFFECT FROM 8 AM TO 5 PM MST SUNDAY... * WHAT...Southwest winds 25 to 35 mph with gusts up to 50 mph expected. The strongest winds will occur during the cold front passage between 9 am to 12 pm MST. * WHERE...Butte, Georgetown Lake, Highway 12 Garrison to Elliston, Homestake Pass, and MacDonald Pass. * WHEN...From 8 AM to 5 PM MST Sunday. * 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. && $$
2 follow-up statements
989 WWUS75 KMSO 030807 NPWMSO URGENT - WEATHER MESSAGE National Weather Service Missoula MT 107 AM MST Sun Jan 3 2021 MTZ001-003-040000- /O.CON.KMSO.WI.Y.0001.210103T0900Z-210104T0000Z/ Kootenai/Cabinet Region-Flathead/Mission Valleys- 107 AM MST Sun Jan 3 2021 ...WIND ADVISORY REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... * WHAT...Southwest winds 20 to 30 mph with gusts up to 40 mph expected. The strongest winds will occur during the cold front passage between 5 am to 8 am MST. * WHERE...Highway 2 Kalispell to Libby, Highway 37 Eureka to Libby, Highway 56 Bull Lake Road, Highway 93 Eureka to Whitefish, Flathead Lake, Flathead Valley, Mission Valley, and Polson. * WHEN...From 2 AM to 5 PM MST Sunday. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ MTZ005-040000- /O.CON.KMSO.WI.Y.0001.210103T1500Z-210104T0000Z/ Missoula/Bitterroot Valleys- 107 AM MST Sun Jan 3 2021 ...WIND ADVISORY REMAINS IN EFFECT FROM 8 AM THIS MORNING TO 5 PM MST THIS AFTERNOON... * WHAT...Southwest winds 15 to 25 mph with gusts up to 45 mph expected. The strongest winds will occur during the cold front passage between 8 am to 11 am MST. * WHERE...Missoula/Bitterroot Valleys. * WHEN...From 8 AM to 5 PM MST Sunday. * 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. && $$ MTZ043-040000- /O.CON.KMSO.WI.Y.0001.210103T1500Z-210104T0000Z/ Potomac/Seeley Lake Region- 107 AM MST Sun Jan 3 2021 ...WIND ADVISORY REMAINS IN EFFECT FROM 8 AM THIS MORNING TO 5 PM MST THIS AFTERNOON... * WHAT...Southwest winds 25 to 35 mph with gusts up to 50 mph expected. The strongest winds will occur during the cold front passage between 9 am to 12 pm MST. Mixed showers may cause slick conditions this morning. * WHERE...Highway 200 Bonner to Greenough and I-90 East Missoula to Bearmouth. * WHEN...From 8 AM to 5 PM MST Sunday. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ MTZ007-040000- /O.CON.KMSO.WI.Y.0001.210103T1500Z-210104T0000Z/ Butte/Blackfoot Region- 107 AM MST Sun Jan 3 2021 ...WIND ADVISORY REMAINS IN EFFECT FROM 8 AM THIS MORNING TO 5 PM MST THIS AFTERNOON... * WHAT...Southwest winds 25 to 35 mph with gusts up to 50 mph expected. The strongest winds will occur during the cold front passage between 9 am to 12 pm MST. A period of light snow may cause slick conditions late this morning. * WHERE...Butte, Georgetown Lake, Highway 12 Garrison to Elliston, Homestake Pass, and MacDonald Pass. * WHEN...From 8 AM to 5 PM MST Sunday. * 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. && $$
235 WWUS75 KMSO 031924 NPWMSO URGENT - WEATHER MESSAGE National Weather Service Missoula MT 1224 PM MST Sun Jan 3 2021 MTZ001-032030- /O.CAN.KMSO.WI.Y.0001.000000T0000Z-210104T0000Z/ Kootenai/Cabinet Region- 1224 PM MST Sun Jan 3 2021 ...WIND ADVISORY IS CANCELLED... $$ MTZ003-040000- /O.CON.KMSO.WI.Y.0001.000000T0000Z-210104T0000Z/ Flathead/Mission Valleys- 1224 PM MST Sun Jan 3 2021 ...WIND ADVISORY REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... * WHAT...Southwest winds 15 to 25 mph with gusts up to 35 mph. * WHERE...Flathead Lake, Flathead Valley, Mission Valley, and Polson. * WHEN...Until 5 PM MST this afternoon. * 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. && $$ MTZ005-040000- /O.CON.KMSO.WI.Y.0001.000000T0000Z-210104T0000Z/ Missoula/Bitterroot Valleys- 1224 PM MST Sun Jan 3 2021 ...WIND ADVISORY REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... * WHAT...Southwest winds 15 to 25 mph with gusts up to 40 mph. * WHERE...Missoula/Bitterroot Valleys. * WHEN...Until 5 PM MST this afternoon. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ MTZ043-040000- /O.CON.KMSO.WI.Y.0001.000000T0000Z-210104T0000Z/ Potomac/Seeley Lake Region- 1224 PM MST Sun Jan 3 2021 ...WIND ADVISORY REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... * WHAT...West winds 25 to 35 mph with gusts up to 45 mph. * WHERE...Highway 200 Bonner to Greenough, Highway 83 Seeley Lake to Condon, and I-90 East Missoula to Bearmouth. * WHEN...Until 5 PM MST this afternoon. * 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. && $$ MTZ007-040000- /O.CON.KMSO.WI.Y.0001.000000T0000Z-210104T0000Z/ Butte/Blackfoot Region- 1224 PM MST Sun Jan 3 2021 ...WIND ADVISORY REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... * WHAT...West winds 20 to 30 mph with gusts up to 45 mph. * WHERE...Butte, Georgetown Lake, Highway 12 Garrison to Elliston, Homestake Pass, and MacDonald Pass. * WHEN...Until 5 PM MST this afternoon. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$
The office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 2, 3:16 AM MST | Winter Storm Warning | MSO | Mineral, Missoula, Sanders | 33 hr |
| Jan 2, 1:58 PM MST | Winter Weather Advisory | MSO | Flathead, Granite, Lake, Missoula, Ravalli | 23 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.