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wgus46 ksew 171945

bulletin - immediate broadcast requested
flood warning
national weather service seattle wa
1245 pm pdt thu apr 17 2014

flood bulletin no. 31

1245 pm pdt thu apr 17 2014

the national weather service in seattle has extended the

* 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 1.84 inches of rain in the last 24   
  hours. the rainfall forecast is for another 1.0 inches of rain in  
  the oso area and up to 1.5 inches in the mountains through friday 
  morning. the river will continue rising today...cresting tonight 
  before midnight with the largest flows since the slide occurred.
  the peak flow forecast for the north fork river near arlington     
  gage is near 9.3 ft. or 13000 cfs and near 7900 cfs for the 
  north fork stillaguamish river at oso.

* at 1200 pm pdt...the pool elevation was 285.8 ft.

* the pool elevation is forecast to rise to 287.7 ft. by thursday 
  night before midnight. the pool elevation will start dropping 
  significantly friday. there is a great amount of uncertainty in 
  the forecast pool elevation crest 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


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