Alert archive / Idaho / Flash Flood Watches in 2021
Flash Flood Watch 5, NWS Spokane, WA
NWS Spokane, WA issued this flash flood watch at Aug 19, 2021, 1:01 PM PDT for 8 counties in Idaho; 8 counties in Washington. It took effect at Aug 20, 2021, 1:00 PM PDT. It was in force for 27 hr.
The area
The counties it named.
The facts
- Issued
- Aug 19, 2021, 1:01 PM PDT (20:01 UTC)
- In effect from
- Aug 20, 2021, 1:00 PM PDT
- Expired
- Aug 21, 2021, 4:00 PM PDT
- In force
- 27 hr
- Issued by
- NWS Spokane, WA
- Flood severity
- None
Counties Benewah County, ID, Bonner County, ID, Boundary County, ID, Kootenai County, ID, Latah County, ID, Lewis County, ID, Nez Perce County, ID, Shoshone County, ID, Asotin County, WA, Chelan County, WA, Ferry County, WA, Garfield County, WA, Okanogan County, WA, Pend Oreille County, WA, Spokane County, WA, Stevens County, WA
The radar
The Spokane radar (KOTX), 23 km from the middle of the area, began a volume at 20:05 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, 8.0 hours before the alert went out and 77 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
- 1552 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 55 m²/s²
- 0-3 km storm-relative helicity
- 179 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
996 WGUS66 KOTX 192001 FFAOTX URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Spokane WA 101 PM PDT Thu Aug 19 2021 .A strong system moving into the Pacific Northwest will bring scattered to numerous showers and thunderstorms to the area starting Friday afternoon and continuing through Saturday. IDC009-017-021-055-057-079-WAC007-019-047-051-065-202015- /O.NEW.KOTX.FF.A.0005.210820T2000Z-210821T2300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Benewah-Bonner-Boundary-Kootenai-Latah-Shoshone-Chelan-Ferry- Okanogan-Pend Oreille-Stevens- Including the cities of Porthill, Deary, Laurier, Chewelah, Wallace, Osburn, Worley, Curlew, Methow, Springdale, Hayden, Rathdrum, Republic, Danville, Juliaetta, Naples, Wenatchee, Eastport, St Maries, Manson, Omak, Tensed, Cusick, Moscow, Northport, Bonners Ferry, Athol, Kellogg, Calder, Cashmere, Brewster, Plain, Okanogan, Colville, Mullan, Diamond Lake, Kettle Falls, Newport, Smelterville, Sandpoint, Clark Fork, Coeur d'Alene, Ione, Leavenworth, Oroville, Post Falls, Moyie Springs, Mazama, Kendrick, Bayview, Conconully, Entiat, Priest River, Potlatch, Winthrop, Plummer, Blanchard, Genesee, Twisp, Careywood, Keller, Chelan, Inchelium, Metaline Falls, and Pinehurst 101 PM PDT Thu Aug 19 2021 ...FLASH FLOOD WATCH IN EFFECT FROM FRIDAY AFTERNOON THROUGH SATURDAY AFTERNOON... The National Weather Service in Spokane has issued a * Flash Flood Watch for Portions of North Idaho, including the following areas, Benewah, Bonner, Boundary, Kootenai, Latah and Shoshone. Portions of Washington, including the following areas, Chelan, Ferry, Okanogan, Pend Oreille and Stevens. * From Friday afternoon through Saturday afternoon. * Scattered to numerous showers and thunderstorms will develop Friday afternoon and continue through Saturday. These showers will be slow moving and contain moderate to heavy rain. * Locally heavy rain in a short amount of time over steep terrain or recently burned areas heightens the risk of dangerous flash flooding and debris flows. Sudden rushes of water in creeks and stream drainages could wash away anyone or thing nearby. Debris flows can cause considerable damage to structures in its way. Road washouts or rockslides are also possible from the localized heavy rain. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ LN
3 follow-up statements
676 WGUS66 KOTX 201832 FFAOTX URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Spokane WA 1132 AM PDT Fri Aug 20 2021 .A strong system moving into the Pacific Northwest will bring scattered to numerous showers and thunderstorms to the area starting this afternoon and continuing through Saturday. IDC061-069-WAC003-023-063-211645- /O.EXA.KOTX.FF.A.0005.210820T2000Z-210821T2300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Lewis-Nez Perce-Asotin-Garfield-Spokane- Including the cities of Rockford, Peck, Clarkston, Pomeroy, Winchester, Nezperce, Anatone, Craigmont, Cheney, Liberty Lake, Gifford, Kamiah, Lapwai, Airway Heights, Medical Lake, Deer Park, Culdesac, Spokane, Lewiston, and Asotin 1132 AM PDT Fri Aug 20 2021 ...FLASH FLOOD WATCH IN EFFECT THROUGH SATURDAY AFTERNOON... The National Weather Service in Spokane has expanded the * Flash Flood Watch to include Portions of North Central Idaho, including the following areas, Lewis and Nez Perce. Portions of Washington, including the following areas, Asotin, Garfield and Spokane. * Through Saturday afternoon. * Scattered to numerous showers and thunderstorms will develop this afternoon and continue through Saturday. These showers will be slow moving and contain moderate to heavy rain. * Locally heavy rain in a short amount of time over steep terrain or recently burned areas heightens the risk of dangerous flash flooding and debris flows. Sudden rushes of water in creeks and stream drainages could wash away anyone or anything nearby. Debris flows can cause considerable damage to structures along the way. Road washouts or rockslides are also possible from localized heavy rain. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ IDC009-017-021-055-057-079-WAC007-019-047-051-065-211645- /O.CON.KOTX.FF.A.0005.210820T2000Z-210821T2300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Benewah-Bonner-Boundary-Kootenai-Latah-Shoshone-Chelan-Ferry- Okanogan-Pend Oreille-Stevens- Including the cities of Porthill, Deary, Laurier, Chewelah, Wallace, Osburn, Worley, Curlew, Methow, Springdale, Hayden, Rathdrum, Republic, Danville, Juliaetta, Naples, Wenatchee, Eastport, St Maries, Manson, Omak, Tensed, Cusick, Moscow, Northport, Bonners Ferry, Athol, Kellogg, Calder, Cashmere, Brewster, Plain, Okanogan, Colville, Mullan, Diamond Lake, Kettle Falls, Newport, Smelterville, Sandpoint, Clark Fork, Coeur d'Alene, Ione, Leavenworth, Oroville, Post Falls, Moyie Springs, Mazama, Kendrick, Bayview, Conconully, Entiat, Priest River, Potlatch, Winthrop, Plummer, Blanchard, Genesee, Twisp, Careywood, Keller, Chelan, Inchelium, Metaline Falls, and Pinehurst 1132 AM PDT Fri Aug 20 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH SATURDAY AFTERNOON... The Flash Flood Watch continues for * Portions of North Idaho, including the following areas, Benewah, Bonner, Boundary, Kootenai, Latah and Shoshone. Portions of Washington, including the following areas, Chelan, Ferry, Okanogan, Pend Oreille and Stevens. * Through Saturday afternoon. * Scattered to numerous showers and thunderstorms will develop this afternoon and continue through Saturday. These showers will be slow moving and contain moderate to heavy rain. * Locally heavy rain in a short amount of time over steep terrain or recently burned areas heightens the risk of dangerous flash flooding and debris flows. Sudden rushes of water in creeks and stream drainages could wash away anyone or anything nearby. Debris flows can cause considerable damage to structures along the way. Road washouts or rockslides are also possible from localized heavy rain. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ KD
947 WGUS66 KOTX 211645 FFAOTX Flood Watch National Weather Service Spokane WA 945 AM PDT Sat Aug 21 2021 .A strong system moving into the Pacific Northwest will continue to bring scattered showers and isolated thunderstorms to the area through the afternoon. IDC009-017-021-055-057-061-069-079-WAC003-007-019-023-047-051-063- 065-212300- /O.CON.KOTX.FF.A.0005.000000T0000Z-210821T2300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Benewah-Bonner-Boundary-Kootenai-Latah-Lewis-Nez Perce-Shoshone- Asotin-Chelan-Ferry-Garfield-Okanogan-Pend Oreille-Spokane- Stevens- Including the cities of Porthill, Rockford, Deary, Manson, Chewelah, Winchester, Osburn, Worley, Curlew, Nezperce, Methow, Springdale, Hayden, Liberty Lake, Rathdrum, Republic, Danville, Cheney, Kamiah, Juliaetta, Naples, Wenatchee, Eastport, St Maries, Wallace, Omak, Tensed, Cusick, Moscow, Ione, Northport, Bonners Ferry, Diamond Lake, Athol, Kellogg, Calder, Cashmere, Brewster, Plain, Okanogan, Peck, Mullan, Pomeroy, Kettle Falls, Newport, Smelterville, Spokane, Sandpoint, Clark Fork, Coeur d'Alene, Craigmont, Leavenworth, Deer Park, Colville, Oroville, Post Falls, Moyie Springs, Mazama, Medical Lake, Kendrick, Bayview, Lewiston, Conconully, Entiat, Priest River, Potlatch, Winthrop, Clarkston, Plummer, Laurier, Anatone, Blanchard, Lapwai, Gifford, Genesee, Airway Heights, Twisp, Careywood, Keller, Culdesac, Chelan, Inchelium, Metaline Falls, Asotin, and Pinehurst 945 AM PDT Sat Aug 21 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 4 PM PDT THIS AFTERNOON... The Flash Flood Watch continues for * Portions of Idaho, including the following areas, Benewah, Bonner, Boundary, Kootenai, Latah, Lewis, Nez Perce and Shoshone. Portions of Washington, including the following areas, Asotin, Chelan, Ferry, Garfield, Okanogan, Pend Oreille, Spokane and Stevens. * Until 4 PM PDT this afternoon. * Scattered to numerous showers and will continue to develop through the afternoon. These showers will be slow moving and contain moderate to heavy rain. There is a chance for isolated thunderstorms in northern Idaho and northern Washington. * Locally heavy rain in a short amount of time over steep terrain or recently burned areas heightens the risk of dangerous flash flooding and debris flows. Sudden rushes of water in creeks and stream drainages could wash away anyone or anything nearby. Debris flows can cause considerable damage to structures along the way. Road washouts or rockslides are also possible from localized heavy rain. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ JS
497 WGUS66 KOTX 212254 FFAOTX Flood Watch National Weather Service Spokane WA 354 PM PDT Sat Aug 21 2021 IDC009-017-021-055-057-061-069-079-WAC003-007-019-023-047-051-063- 065-220000- /O.EXP.KOTX.FF.A.0005.000000T0000Z-210821T2300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Benewah-Bonner-Boundary-Kootenai-Latah-Lewis-Nez Perce-Shoshone- Asotin-Chelan-Ferry-Garfield-Okanogan-Pend Oreille-Spokane- Stevens- Including the cities of Porthill, Rockford, Deary, Manson, Chewelah, Winchester, Osburn, Worley, Curlew, Nezperce, Methow, Springdale, Hayden, Liberty Lake, Rathdrum, Republic, Danville, Cheney, Kamiah, Juliaetta, Naples, Wenatchee, Eastport, St Maries, Wallace, Omak, Tensed, Cusick, Moscow, Ione, Northport, Bonners Ferry, Diamond Lake, Athol, Kellogg, Calder, Cashmere, Brewster, Plain, Okanogan, Peck, Mullan, Pomeroy, Kettle Falls, Newport, Smelterville, Spokane, Sandpoint, Clark Fork, Coeur d'Alene, Craigmont, Leavenworth, Deer Park, Colville, Oroville, Post Falls, Moyie Springs, Mazama, Medical Lake, Kendrick, Bayview, Lewiston, Conconully, Entiat, Priest River, Potlatch, Winthrop, Clarkston, Plummer, Laurier, Anatone, Blanchard, Lapwai, Gifford, Genesee, Airway Heights, Twisp, Careywood, Keller, Culdesac, Chelan, Inchelium, Metaline Falls, Asotin, and Pinehurst 354 PM PDT Sat Aug 21 2021 ...FLASH FLOOD WATCH WILL EXPIRE AT 4 PM PDT THIS AFTERNOON... The Flash Flood Watch for Portions of Idaho, including the following areas, Benewah, Bonner, Boundary, Kootenai, Latah, Lewis, Nez Perce and Shoshone. Portions of Washington, including the following areas, Asotin, Chelan, Ferry, Garfield, Okanogan, Pend Oreille, Spokane and Stevens. will expire at 4 PM PDT this afternoon. The Flood Watch is cancelled. Flooding is no longer expected to pose a threat. Please continue to heed remaining road closures. $$ JCLEV
Nearby
Flash Flood Watches in Idaho, 2021Flash Flood Watches in Washington, 2021Every flash flood watch 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.