East Puget Sound Lowlands

 Areal Flood Warning  Statement as of 3:21 PM PDT on April 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.


Lat... Lon 4825 12181 4829 12185 4829 12177 4829 12166
      4824 12165 4826 12174


Albrecht

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