Alert archive / Washington / Flash Flood Watches in 2021
Flash Flood Watch 2, NWS Spokane, WA
NWS Spokane, WA issued this flash flood watch at Jul 12, 2021, 2:29 AM PDT for Chelan County, Okanogan County, Washington. It took effect at Jul 12, 2021, 2:00 PM PDT. It was in force for 7 hr.
The area
The counties it named.
The facts
- Issued
- Jul 12, 2021, 2:29 AM PDT (09:29 UTC)
- In effect from
- Jul 12, 2021, 2:00 PM PDT
- Expired
- Jul 12, 2021, 8:37 PM PDT
- In force
- 7 hr
- Issued by
- NWS Spokane, WA
- Flood severity
- None
Counties Chelan County, WA, Okanogan County, WA
The radar
The Seattle radar (KATX), 172 km from the middle of the area, began a volume at 09:29 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 00:00Z, 9.5 hours before the alert went out and 287 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
- 3616 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 40 m²/s²
- 0-3 km storm-relative helicity
- 58 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
421 WGUS66 KOTX 120929 FFAOTX URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Spokane WA 229 AM PDT Mon Jul 12 2021 .Thunderstorms are expected to form over the north Cascade mountains of Washington late this afternoon and evening. These storms will have the potential to produce heavy rain in steep terrain where drainages and fire burned areas could be overwhelmed with water runoff. WAC007-047-122130- /O.NEW.KOTX.FF.A.0002.210712T2100Z-210713T0700Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Chelan-Okanogan- Including the cities of Omak, Winthrop, Manson, Brewster, Plain, Leavenworth, Methow, Okanogan, Twisp, Mazama, Oroville, Cashmere, Chelan, Conconully, Entiat, and Wenatchee 229 AM PDT Mon Jul 12 2021 ...FLASH FLOOD WATCH IN EFFECT FROM 2 PM PDT THIS AFTERNOON THROUGH THIS EVENING... The National Weather Service in Spokane has issued a * Flash Flood Watch for A portion of North Central Washington, including the following areas, Chelan and Okanogan. * From 2 PM PDT this afternoon through this evening. * Thunderstorms with heavy rain combined with steep terrain and/or previously fire burned areas could result in a dangerous and sudden wall of water which will be hazardous to anyone in its path. * Sudden rushes of water in creek and stream drainages could wash away any person or thing nearby. Debris flows can cause additional damage to low lying bridges or other structures. Road washouts are common in flash flood events. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ TC
2 follow-up statements
181 WGUS66 KOTX 121849 FFAOTX Flood Watch National Weather Service Spokane WA 1149 AM PDT Mon Jul 12 2021 .Thunderstorms are expected to form over the north Cascade mountains of Washington late this afternoon and evening. These storms will have the potential to produce heavy rain in steep terrain where drainages and fire burned areas could be overwhelmed with water runoff. WAC007-047-130700- /O.CON.KOTX.FF.A.0002.210712T2100Z-210713T0700Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Chelan-Okanogan- Including the cities of Omak, Winthrop, Manson, Brewster, Plain, Leavenworth, Methow, Okanogan, Twisp, Mazama, Oroville, Cashmere, Chelan, Conconully, Entiat, and Wenatchee 1149 AM PDT Mon Jul 12 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH THIS EVENING... The Flash Flood Watch continues for * A portion of North Central Washington, including the following areas, Chelan and Okanogan. * Through this evening. * Thunderstorms with heavy rain combined with steep terrain and/or previously fire burned areas could result in a dangerous and sudden wall of water which will be hazardous to anyone in its path. * Sudden rushes of water in creek and stream drainages could wash away any person or thing nearby. Debris flows can cause additional damage to low lying bridges or other structures. Road washouts are common in flash flood events. Campgrounds below the Crescent Mountain and McLeod burn scars will be at highest risk for impacts with thunderstorms including: Roads End South Creek, War Creek, Poplar Flatt, Black Pine, and Ruffed Grouse campgrounds. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ SVH
356 WGUS66 KOTX 130337 FFAOTX Flood Watch National Weather Service Spokane WA 837 PM PDT Mon Jul 12 2021 WAC007-047-130445- /O.CAN.KOTX.FF.A.0002.000000T0000Z-210713T0700Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Chelan-Okanogan- Including the cities of Omak, Winthrop, Manson, Brewster, Plain, Leavenworth, Methow, Okanogan, Twisp, Mazama, Oroville, Cashmere, Chelan, Conconully, Entiat, and Wenatchee 837 PM PDT Mon Jul 12 2021 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch for A portion of North Central Washington, including the following areas, Chelan and Okanogan. has been cancelled. The Flood Watch is cancelled. Flooding is no longer expected to pose a threat. Please continue to heed remaining road closures. $$ RP
Nearby
Flash 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.