Storm Events Database

Event Details

Event Flood
-- Flood Cause Heavy Rain / Snow Melt
State WASHINGTON
County/Area OKANOGAN
WFO OTX
Begin Date 05/14/2011 15:00:00 PST-8
Begin Range 2
Begin Azimuth SE
Begin Location MAZAMA ARPT
Begin Lat/Lon 48.63/-120.46
End Date 05/15/2011 16:00:00 PST-8
End Range 2
End Azimuth SE
End Location MAZAMA ARPT
End Lat/Lon 48.63/-120.46
Deaths Direct/Indirect 0/0 (fatality details below, when available...)
Injuries Direct/Indirect 0/0
Property Damage 0.00K
Crop Damage 0.00K
Episode Narrative A wet spring season resulted in saturated soils across the Inland Northwest. Rivers, small streams, and creeks began to rise as warming temperatures on May 13th and 14th melted mountain snowpack across the east slopes of the northern Cascades and Northeast Mountains. Warm and dry weather transitioned to cooler but considerably wetter conditions over the weekend May 14th and 15th. An upper level low pumped a considerable amount of moisture into the region with an extended period of heavy rainfall over the Cascades to the Okanogan Highlands early Saturday morning through Sunday morning. This heavy rainfall slowly pushed to the northeast into the Spokane Area and Northeast Mountains by Sunday afternoon into Monday. Forty-eight hour rainfall totals ranged from one to three inches across the east slopes of the northern Cascades, one to one and a half inches across the Spokane Area, to one to two and a quarter inches across the Northeast mountains. In addition to the flooding, landslides were reported, and even a few trees were downed as winds picked up across the Okanogan Highlands Saturday morning.
Event Narrative Lost River Road flooded approximately three miles east of Mazama as debris clogged the flow of water underneath a bridge. Two feet of water was observed to be flowing over the roadway resulting in its closure. No damage was reported to the road.


All events for this episode:

Location County/Zone St. Date Time T.Z. Type Mag Dth Inj PrD CrD
Totals: 0 0 46.00K 0.00K
CHEWELAH STEVENS CO. WA 05/12/2011 13:00 PST-8 Flood 0 0 0.00K 0.00K
OKANOGAN HIGHLANDS (ZONE) OKANOGAN HIGHLANDS (ZONE) WA 05/13/2011 23:50 PST-8 Strong Wind 33 kts. EG 0 0 1.00K 0.00K
EAST SLOPES NORTHERN CASCADES (ZONE) EAST SLOPES NORTHERN CASCADES (ZONE) WA 05/14/2011 12:00 PST-8 Landslide 0 0 0.00K 0.00K
MAZAMA ARPT OKANOGAN CO. WA 05/14/2011 15:00 PST-8 Flood 0 0 0.00K 0.00K
MALAGA CHELAN CO. WA 05/15/2011 09:45 PST-8 Flood 0 0 20.00K 0.00K
VELOX SPOKANE CO. WA 05/15/2011 14:00 PST-8 Heavy Rain 0 0 0.00K 0.00K
VELOX SPOKANE CO. WA 05/15/2011 14:00 PST-8 Heavy Rain 0 0 0.00K 0.00K
GREEN BLUFF SPOKANE CO. WA 05/16/2011 08:45 PST-8 Flood 0 0 25.00K 0.00K
Totals: 0 0 46.00K 0.00K