East Puget Sound Lowlands Severe Watches & Warnings NOAA Weather Radio

Areal Flood Warning
Statement as of 3:21 PM PDT en Abril 20, 2014

...The Flood Warning remains in effect until 445 PM PDT Thursday for north central Snohomish County...

* Flood Warning for the North Fork stillaguamish river east of the State Route 530 slide in north central Snohomish County...

* until 445 PM PDT April 24.

* Flooding continues on the North Fork of the stillaguamish river upstream of the sr 530 slide due to debris from the State Route 530 slide partially blocking the river and the resulting pooling of water behind the debris dam. We will be updating the Flood Warning on a day to day basis.

* The Oso area has received 0.80 inches of rain in the past 24 hours...and heavier amounts were reported north and east of the landslide area. This resulted in rises on the North Fork of the stillaguamish river last night. Mainly dry conditions are expected through mid afternoon Monday...this will allow the river and slide pool to slowly recede through Monday.

* At 230 PM PDT Sunday...the North Fork of the stillaguamish river near Arlington was at 5.5 feet or 4195 cfs. The North Fork of the stillaguamish near Oso was at 217.0 feet...or 2360 cfs. The river crested around 6 am this morning and will slowly recede through Monday.

* At 230 PM PDT Sunday...the elevation of the slide pool to the east of the sr 530 landslide was 284.2 feet. The pool elevation is forecast to recede to around 283.6 feet by late Monday afternoon. There continues to be a great amount of uncertainty in the forecast pool elevation due in part to limited knowledge of how much water the new stream channel through the slide debris will be able to convey.

Precautionary/preparedness actions...

A Flood Warning means flooding is occurring or imminent. Most flood related deaths occur in automobiles. Do not attempt to cross water covered bridges...dips...or low water crossings. Never try to cross a flowing stream...even a small one...on foot. To escape rising water move up to higher ground.

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