Alert archive / Idaho / Winter Storm Warnings in 2021
Winter Storm Warning 7, NWS Pocatello, ID
NWS Pocatello, ID issued this winter storm warning at Oct 23, 2021, 2:21 PM MDT for Blaine County, Butte County, Custer County, Idaho. It took effect at Oct 24, 2021, 12:00 PM MDT. It was in force for 24 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Oct 23, 2021, 2:21 PM MDT (20:21 UTC)
- In effect from
- Oct 24, 2021, 12:00 PM MDT
- Expired
- Oct 25, 2021, 12:00 PM MDT
- In force
- 24 hr
- Issued by
- NWS Pocatello, ID
Counties Blaine County, ID, Butte County, ID, Custer County, ID
The radar
The Pocatello radar (KSFX), 119 km from the middle of the area, began a volume at 20:23 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
Boise Airport, ID (KBOI), launched 12:00Z, 8.4 hours before the alert went out and 194 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
- 1020 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- -20 m²/s²
- 0-3 km storm-relative helicity
- 46 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
255 WWUS45 KPIH 232021 WSWPIH URGENT - WINTER WEATHER MESSAGE National Weather Service Pocatello ID 221 PM MDT Sat Oct 23 2021 IDZ069-071>074-241300- /O.UPG.KPIH.WS.A.0005.211024T1800Z-211025T1800Z/ /O.NEW.KPIH.WS.W.0007.211024T1800Z-211025T1800Z/ Lost River Range-Frank Church Wilderness-Sawtooth/Stanley Basin- Sun Valley Region-Big Lost Highlands/Copper Basin- Including the cities of Borah Peak, Clayton, Stanley, Ketchum, Sun Valley, Galena, and Copper Basin 221 PM MDT Sat Oct 23 2021 ...WINTER STORM WARNING IN EFFECT FROM NOON SUNDAY TO NOON MDT MONDAY... * WHAT...Heavy wet snow expected. Total snow accumulations of up to 3 inches below 7000 feet with 3-12 inches above 7000 feet and locally higher amounts near peaks and ridges. Winds could gust as high as 35 MPH with localized blowing snow, especially as you increase in elevation. * WHERE...Portions of the Idaho central mountains, including but not limited to the Frank Church Wilderness, Banner Summit, Sawtooth Mountains, Galena Summit, the Big Lost Highlands, and Lost River Range. * WHEN...From noon Sunday to noon MDT Monday. * IMPACTS...While slick conditions and light accumulations may occur down into Stanley, Ketchum, and Sun Valley during this event, the greatest concern for very difficult travel will exist over Galena Summit, as well as for local and backcountry roads above about 7,000 feet. In addition, the heavy, wet nature of the snow may strain weaker structures and tree limbs. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions can be obtained by calling 5 1 1. && $$ For more information from the National Weather Service visit https://weather.gov/pocatello
3 follow-up statements
622 WWUS45 KPIH 240832 WSWPIH URGENT - WINTER WEATHER MESSAGE National Weather Service Pocatello ID 232 AM MDT Sun Oct 24 2021 IDZ069-071>074-242300- /O.CON.KPIH.WS.W.0007.211024T1800Z-211025T1800Z/ Lost River Range-Frank Church Wilderness-Sawtooth/Stanley Basin- Sun Valley Region-Big Lost Highlands/Copper Basin- Including the cities of Borah Peak, Clayton, Stanley, Ketchum, Sun Valley, Galena, and Copper Basin 232 AM MDT Sun Oct 24 2021 ...WINTER STORM WARNING REMAINS IN EFFECT FROM NOON TODAY TO NOON MDT MONDAY... * WHAT...Heavy wet snow expected. Total snow accumulations of up to 3 inches below 7000 feet with 3-12 inches above 7000 feet and locally higher amounts near peaks and ridges. Winds could gust as high as 35 MPH with localized blowing snow, especially as you increase in elevation. * WHERE...Portions of the Idaho central mountains, including but not limited to the Frank Church Wilderness, Banner Summit, Sawtooth Mountains, Galena Summit, the Big Lost Highlands, and Lost River Range. * WHEN...From noon Sunday to noon MDT Monday. * IMPACTS...While slick conditions and light accumulations may occur down into Stanley, Ketchum, and Sun Valley during this event, the greatest concern for very difficult travel will exist over Galena Summit, as well as for local and backcountry roads above about 7,000 feet. In addition, the heavy, wet nature of the snow may strain weaker structures and tree limbs. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, leave extra time and bring a flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions can be obtained by calling 5 1 1. && $$ For more information from the National Weather Service visit https://weather.gov/pocatello
380 WWUS45 KPIH 242034 WSWPIH URGENT - WINTER WEATHER MESSAGE National Weather Service Pocatello ID 234 PM MDT Sun Oct 24 2021 IDZ069-071>074-251300- /O.CON.KPIH.WS.W.0007.000000T0000Z-211025T1800Z/ Lost River Range-Frank Church Wilderness-Sawtooth/Stanley Basin- Sun Valley Region-Big Lost Highlands/Copper Basin- Including the cities of Borah Peak, Clayton, Stanley, Ketchum, Sun Valley, Galena, and Copper Basin 234 PM MDT Sun Oct 24 2021 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL NOON MDT MONDAY... * WHAT...Heavy wet snow expected. Total snow accumulations of up to 3 inches below 7000 feet with 3-12 inches above 7000 feet and locally higher amounts near peaks and ridges. Winds could gust as high as 35 MPH with localized blowing snow, especially as you increase in elevation. * WHERE...Portions of the Idaho central mountains, including but not limited to the Frank Church Wilderness, Banner Summit, Sawtooth Mountains, Galena Summit, the Big Lost Highlands, and Lost River Range. * WHEN...Through noon MDT Monday. * IMPACTS...While slick conditions and light accumulations may occur down into Stanley, Ketchum, and Sun Valley during this event, the greatest concern for very difficult travel will exist over Galena Summit, as well as for local and backcountry roads above about 7,000 feet. In addition, the heavy, wet nature of the snow may strain weaker structures and tree limbs. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, leave extra time and bring a flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions can be obtained by calling 5 1 1. && $$ For more information from the National Weather Service visit https://weather.gov/pocatello
478 WWUS45 KPIH 250908 WSWPIH URGENT - WINTER WEATHER MESSAGE National Weather Service Pocatello ID 308 AM MDT Mon Oct 25 2021 IDZ069-071>074-251800- /O.CON.KPIH.WS.W.0007.000000T0000Z-211025T1800Z/ Lost River Range-Frank Church Wilderness-Sawtooth/Stanley Basin- Sun Valley Region-Big Lost Highlands/Copper Basin- Including the cities of Borah Peak, Clayton, Stanley, Ketchum, Sun Valley, Galena, and Copper Basin 308 AM MDT Mon Oct 25 2021 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL NOON MDT TODAY... * WHAT...Heavy wet snow expected. Total snow accumulations of up to 3 inches below 7000 feet with 3-12 inches above 7000 feet and locally higher amounts near peaks and ridges. Winds could gust as high as 35 MPH with localized blowing snow, especially as you increase in elevation. * WHERE...Portions of the Idaho central mountains, including but not limited to the Frank Church Wilderness, Banner Summit, Sawtooth Mountains, Galena Summit, the Big Lost Highlands, and Lost River Range. * WHEN...Through noon MDT Monday. * IMPACTS...While slick conditions and light accumulations may occur down into Stanley, Ketchum, and Sun Valley during this event, the greatest concern for very difficult travel will exist over Galena Summit, as well as for local and backcountry roads above about 7,000 feet. In addition, the heavy, wet nature of the snow may strain weaker structures and tree limbs. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, leave extra time and bring a flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions can be obtained by calling 5 1 1. && $$ For more information from the National Weather Service visit https://weather.gov/pocatello
Nearby
Winter Storm Warnings in Idaho, 2021Every winter storm 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.