Alert archive / Washington / Frost Advisories in 2021
Frost Advisory 1, NWS Spokane, WA
NWS Spokane, WA issued this frost advisory at Aug 31, 2021, 2:06 PM PDT for 6 counties in Idaho; 7 counties in Washington. It took effect at Sep 1, 2021, 2:00 AM PDT. It was in force for 7 hr.
The area
The counties it named.
The facts
- Issued
- Aug 31, 2021, 2:06 PM PDT (21:06 UTC)
- In effect from
- Sep 1, 2021, 2:00 AM PDT
- Expired
- Sep 1, 2021, 9:00 AM PDT
- In force
- 7 hr
- Issued by
- NWS Spokane, WA
Counties Benewah County, ID, Bonner County, ID, Boundary County, ID, Kootenai County, ID, Latah County, ID, Shoshone County, ID, Ferry County, WA, Lincoln County, WA, Okanogan County, WA, Pend Oreille County, WA, Spokane County, WA, Stevens County, WA, Whitman County, WA
The radar
The Spokane radar (KOTX), 28 km from the middle of the area, began a volume at 21:05 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, 9.1 hours before the alert went out and 74 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
- 1135 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- 137 m²/s²
- 0-3 km storm-relative helicity
- 121 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
217 WWUS76 KOTX 312106 NPWOTX URGENT - WEATHER MESSAGE National Weather Service Spokane WA 206 PM PDT Tue Aug 31 2021 IDZ001>004-WAZ033-036>038-010515- /O.NEW.KOTX.FR.Y.0001.210901T0900Z-210901T1600Z/ Northern Panhandle-Coeur d'Alene Area-Idaho Palouse-Central Panhandle Mountains-Washington Palouse-Spokane Area-Northeast Mountains-Okanogan Highlands- Including the cities of Colfax, Chewelah, Wallace, Osburn, Worley, Cheney, Hayden, Rathdrum, Republic, Eastport, St Maries, Moscow, Bonners Ferry, Kellogg, Tekoa, Uniontown, Mullan, Oakesdale, Kettle Falls, Rockford, Rosalia, Spokane, Sandpoint, Wauconda, Coeur d'Alene, La Crosse, Post Falls, Newport, Davenport, Priest River, Potlatch, Plummer, Genesee, Deer Park, Inchelium, Pullman, Colville, and Pinehurst 206 PM PDT Tue Aug 31 2021 ...FROST ADVISORY IN EFFECT FROM 2 AM TO 9 AM PDT WEDNESDAY... * WHAT...Temperatures as low as 37 will result in patchy frost formation. * WHERE...Colfax, Chewelah, Wallace, Osburn, Worley, Cheney, Hayden, Rathdrum, Republic, Eastport, St Maries, Moscow, Bonners Ferry, Kellogg, Tekoa, Uniontown, Mullan, Oakesdale, Kettle Falls, Rockford, Rosalia, Spokane, Sandpoint, Wauconda, Coeur d'Alene, La Crosse, Post Falls, Newport, Davenport, Priest River, Potlatch, Plummer, Genesee, Deer Park, Inchelium, Pullman, Colville, and Pinehurst. * WHEN...From 2 AM to 9 AM PDT Wednesday. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered. * ADDITIONAL DETAILS...Clouds are expected to thin overnight and winds calm down in sheltered valleys after midnight. Coolest temperatures will likely be just before sunrise Wednesday morning. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ TC
2 follow-up statements
575 WWUS76 KOTX 010322 NPWOTX URGENT - WEATHER MESSAGE National Weather Service Spokane WA 822 PM PDT Tue Aug 31 2021 IDZ001>004-WAZ033-036>038-011600- /O.CON.KOTX.FR.Y.0001.210901T0900Z-210901T1600Z/ Northern Panhandle-Coeur d'Alene Area-Idaho Palouse-Central Panhandle Mountains-Washington Palouse-Spokane Area-Northeast Mountains-Okanogan Highlands- Including the cities of Colfax, Chewelah, Wallace, Osburn, Worley, Cheney, Hayden, Rathdrum, Republic, Eastport, St Maries, Moscow, Bonners Ferry, Kellogg, Tekoa, Uniontown, Mullan, Oakesdale, Kettle Falls, Rockford, Rosalia, Spokane, Sandpoint, Wauconda, Coeur d'Alene, La Crosse, Post Falls, Newport, Davenport, Priest River, Potlatch, Plummer, Genesee, Deer Park, Inchelium, Pullman, Colville, and Pinehurst 822 PM PDT Tue Aug 31 2021 ...FROST ADVISORY REMAINS IN EFFECT FROM 2 AM TO 9 AM PDT WEDNESDAY... * WHAT...Temperatures as low as 37 will result in patchy frost formation. * WHERE...Colfax, Chewelah, Wallace, Osburn, Worley, Cheney, Hayden, Rathdrum, Republic, Eastport, St Maries, Moscow, Bonners Ferry, Kellogg, Tekoa, Uniontown, Mullan, Oakesdale, Kettle Falls, Rockford, Rosalia, Spokane, Sandpoint, Wauconda, Coeur d'Alene, La Crosse, Post Falls, Newport, Davenport, Priest River, Potlatch, Plummer, Genesee, Deer Park, Inchelium, Pullman, Colville, and Pinehurst. * WHEN...From 2 AM to 9 AM PDT Wednesday. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered. * ADDITIONAL DETAILS...Clouds are expected to thin overnight with winds calming down in sheltered valleys after midnight. The coolest temperatures will likely be just before sunrise Wednesday morning. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ KD
935 WWUS76 KOTX 011604 NPWOTX URGENT - WEATHER MESSAGE National Weather Service Spokane WA 904 AM PDT Wed Sep 1 2021 IDZ001>004-WAZ033-036>038-011715- /O.EXP.KOTX.FR.Y.0001.000000T0000Z-210901T1600Z/ Northern Panhandle-Coeur d'Alene Area-Idaho Palouse-Central Panhandle Mountains-Washington Palouse-Spokane Area-Northeast Mountains-Okanogan Highlands- Including the cities of Colfax, Chewelah, Wallace, Osburn, Worley, Cheney, Hayden, Rathdrum, Republic, Eastport, St Maries, Moscow, Bonners Ferry, Kellogg, Tekoa, Uniontown, Mullan, Oakesdale, Kettle Falls, Rockford, Rosalia, Spokane, Sandpoint, Wauconda, Coeur d'Alene, La Crosse, Post Falls, Newport, Davenport, Priest River, Potlatch, Plummer, Genesee, Deer Park, Inchelium, Pullman, Colville, and Pinehurst 904 AM PDT Wed Sep 1 2021 ...FROST ADVISORY HAS EXPIRED... The threat has ended. $$ RP
Nearby
Frost Advisories in Washington, 2021Frost Advisories in Idaho, 2021Every frost advisory 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.