Alert archive / Montana / High Wind Warnings in 2021
High Wind Warning 4, NWS Missoula, MT
NWS Missoula, MT issued this high wind warning at Sep 17, 2021, 2:16 PM MDT for Lemhi County, Idaho; 4 counties in Montana. It took effect at Sep 18, 2021, 9:00 AM MDT. It was in force for 12 hr. 16 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
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 Lemhi County, ID, Deer Lodge County, MT, Granite County, MT, Powell County, MT, Silver Bow County, MT
The radar
The Missoula radar (KMSX), 127 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Sep 18, 11:46 AM MDT | NON-TSTM WND GST 40 | 3 Sse Butte, MT | ASOS STATION KBTM BUTTE-MOONEY AP. |
| Sep 18, 12:11 PM MDT | NON-TSTM WND GST 52 | Macdonald Pass, MT | CORRECTS PREVIOUS NON-TSTM WND GST REPORT FROM MTMDP. MACDONALD PASS US-12 MP 27.9, MT. MTMDP (MT DOT) MEASURED 37G52 MPH AT 12:11 AND 12:15 PM MDT. |
| Sep 18, 12:11 PM MDT | NON-TSTM WND GST 52 | Mtmdp, MT | MACDONALD PASS US-12 MP 27.9, MT. MTMDP (MT DOT) ELEV: 6325 FT.; LAT/LON: 46.56148/-112.30931 WINDS OF 37G52 MPH OBSERVED AT 12:11 AND 12:15 PM MDT. |
| Sep 18, 12:11 PM MDT | NON-TSTM WND GST 52 | Mtmdp, MT | MACDONALD PASS US-12 MP 27.9, MT. MTMDP (MT DOT) MEASURED 37G52 MPH AT 12:11 AND 12:15 PM MDT. |
| Sep 18, 12:15 PM MDT | NON-TSTM WND GST 52 | Macdonald Pass, MT | MACDONALD PASS HWY 12 SENSOR. |
| Sep 18, 12:26 PM MDT | NON-TSTM WND GST 41 | 11 N Ellis, ID | MESONET STATION EZRI1 EZRA CREEK. |
| Sep 18, 1:26 PM MDT | NON-TSTM WND GST 46 | 11 N Ellis, ID | MESONET STATION EZRI1 EZRA CREEK. |
| Sep 18, 2:35 PM MDT | NON-TSTM WND GST 40 | 4 S Salmon, ID | KSMN AIRPORT AWOS. |
| Sep 18, 2:50 PM MDT | NON-TSTM WND GST 44 | 3 Sw Salmon, ID | SALMON RAWS. |
| Sep 18, 3:53 PM MDT | NON-TSTM WND GST 51 | 3 Nne Newcomb, MT | |
| Sep 18, 4:51 PM MDT | NON-TSTM WND GST 56 | 6 Se North Fork, ID | MESONET STATION KRCI1 KRILEY CREEK RAWS. |
| Sep 18, 5:51 PM MDT | NON-TSTM WND GST 60 | 6 Se North Fork, ID | MESONET STATION KRCI1 KRILEY CREEK RAWS. |
| Sep 18, 6:00 PM MDT | NON-TSTM WND GST 49 | 2 Wsw Deer Lodge, MT | MESONET STATION K38S 1.8 W DEER LODGE (GTFWFO). |
| Sep 18, 6:08 PM MDT | NON-TSTM WND GST 51 | Avon North Mt Hwy 141 M, MT | OBSERVATION FROM MESOWEST SITE: AVON NORTH MT-141 MP 8.1, MT. MTAVN (MT DOT). ELEV: 5085 FT.; LAT/LON: 46.69679/-112.65944 LOCATION FOR THIS LSR ESTIMATED FROM MESOWEST MAP. |
| Sep 18, 6:48 PM MDT | NON-TSTM WND GST 48 | 6 E Yellowjacket, ID | MESONET STATION BAEI1 RED ROCK PEAK. |
| Sep 18, 6:51 PM MDT | NON-TSTM WND GST 43 | 11 Wsw Shoup, ID | MESONET STATION SKFI1 SKULL GULCH. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Great_falls, MT (KTFX), launched 12:00Z, 8.3 hours before the alert went out and 254 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
- 2562 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 49 m²/s²
- 0-3 km storm-relative helicity
- 136 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 | Lake Wind Advisory | MSO | Flathead, Lake, Sanders | 31 hr |
| Sep 17, 2:16 PM MDT | Wind Advisory | MSO | Granite, Lake, Missoula, Powell, Ravalli | 31 hr |
Nearby
High Wind Warnings in Montana, 2021High Wind Warnings in Idaho, 2021Every high wind warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.