Flood Warning
Issued by NWS Seattle/Tacoma, WA

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2 3 4
000
WGUS46 KSEW 171945
FLWSEW

BULLETIN - IMMEDIATE BROADCAST REQUESTED
FLOOD WARNING
NATIONAL WEATHER SERVICE SEATTLE WA
1245 PM PDT THU APR 17 2014

FLOOD BULLETIN NO. 31

WAC061-242345-
/O.EXT.KSEW.FA.W.0003.000000T0000Z-140424T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SNOHOMISH-
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

$$

BOWER

WWW.WEATHER.GOV/SEATTLE







USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.