Alert archive / Idaho / Frost Advisories in 2021
Frost Advisory 2, NWS Spokane, WA
NWS Spokane, WA issued this frost advisory at Sep 1, 2021, 2:06 PM PDT for 6 counties in Idaho; 5 counties in Washington. It took effect at Sep 2, 2021, 4:00 AM PDT. It was in force for 5 hr.
The area
The counties it named.
The facts
- Issued
- Sep 1, 2021, 2:06 PM PDT (21:06 UTC)
- In effect from
- Sep 2, 2021, 4:00 AM PDT
- Expired
- Sep 2, 2021, 9:00 AM PDT
- In force
- 5 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, Okanogan County, WA, Pend Oreille County, WA, Spokane County, WA, Stevens County, WA
The radar
The Spokane radar (KOTX), 43 km from the middle of the area, began a volume at 21:10 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 71 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
- 1398 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 21 m²/s²
- 0-3 km storm-relative helicity
- 85 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
591 WWUS76 KOTX 012106 NPWOTX URGENT - WEATHER MESSAGE National Weather Service Spokane WA 206 PM PDT Wed Sep 1 2021 IDZ001-003-004-WAZ037-038-020915- /O.NEW.KOTX.FR.Y.0002.210902T1100Z-210902T1600Z/ Northern Panhandle-Idaho Palouse-Central Panhandle Mountains- Northeast Mountains-Okanogan Highlands- Including the cities of Chewelah, Wallace, Osburn, Rathdrum, Republic, Eastport, St Maries, Moscow, Bonners Ferry, Kellogg, Mullan, Kettle Falls, Sandpoint, Wauconda, Newport, Priest River, Potlatch, Plummer, Genesee, Deer Park, Pinehurst, Colville, and Inchelium 206 PM PDT Wed Sep 1 2021 ...FROST ADVISORY IN EFFECT FROM 4 AM TO 9 AM PDT THURSDAY... * WHAT...Temperatures as low as 37 will result in frost formation. * WHERE...Chewelah, Republic, St Maries, Moscow, Kellogg, Mullan, Kettle Falls, Sandpoint, Wauconda, Newport, Priest River, Potlatch, Deer Park, Pinehurst, Colville. * WHEN...From 4 AM to 9 AM PDT Thursday. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered. * ADDITIONAL DETAILS...Coolest temperatures will likely be just before sunrise Thursday morning. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ RP
2 follow-up statements
216 WWUS76 KOTX 020238 NPWOTX URGENT - WEATHER MESSAGE National Weather Service Spokane WA 738 PM PDT Wed Sep 1 2021 IDZ001-003-004-WAZ037-038-021600- /O.CON.KOTX.FR.Y.0002.210902T1100Z-210902T1600Z/ Northern Panhandle-Idaho Palouse-Central Panhandle Mountains- Northeast Mountains-Okanogan Highlands- Including the cities of Chewelah, Wallace, Osburn, Rathdrum, Republic, Eastport, St Maries, Moscow, Bonners Ferry, Kellogg, Mullan, Kettle Falls, Sandpoint, Wauconda, Newport, Priest River, Potlatch, Plummer, Genesee, Deer Park, Pinehurst, Colville, and Inchelium 738 PM PDT Wed Sep 1 2021 ...FROST ADVISORY REMAINS IN EFFECT FROM 4 AM TO 9 AM PDT THURSDAY... * WHAT...Low temperatures in the 30s will result in frost formation. * WHERE...Chewelah, Wallace, Osburn, Rathdrum, Republic, Eastport, St Maries, Moscow, Bonners Ferry, Kellogg, Mullan, Kettle Falls, Sandpoint, Wauconda, Newport, Priest River, Potlatch, Plummer, Genesee, Deer Park, Pinehurst, Colville, and Inchelium. * WHEN...From 4 AM to 9 AM PDT Thursday. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered. * ADDITIONAL DETAILS...Coolest temperatures will likely be just after sunrise Thursday morning. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ TW
008 WWUS76 KOTX 021610 NPWOTX URGENT - WEATHER MESSAGE National Weather Service Spokane WA 910 AM PDT Thu Sep 2 2021 IDZ001-003-004-WAZ037-038-021715- /O.EXP.KOTX.FR.Y.0002.000000T0000Z-210902T1600Z/ Northern Panhandle-Idaho Palouse-Central Panhandle Mountains- Northeast Mountains-Okanogan Highlands- Including the cities of Chewelah, Wallace, Osburn, Rathdrum, Republic, Eastport, St Maries, Moscow, Bonners Ferry, Kellogg, Mullan, Kettle Falls, Sandpoint, Wauconda, Newport, Priest River, Potlatch, Plummer, Genesee, Deer Park, Pinehurst, Colville, and Inchelium 910 AM PDT Thu Sep 2 2021 ...FROST ADVISORY HAS EXPIRED... The threat has ended. $$ JCLEV
Nearby
Frost Advisories in Idaho, 2021Frost Advisories in Washington, 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.